Released this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
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We wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
IntechOpen is proud to announce that 191 of our authors have made the Clarivate™ Highly Cited Researchers List for 2020, ranking them among the top 1% most-cited.
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Throughout the years, the list has named a total of 261 IntechOpen authors as Highly Cited. Of those researchers, 69 have been featured on the list multiple times.
\n\n\n\n
Released this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\n\n
We wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
\n'}],latestNews:[{slug:"webinar-introduction-to-open-science-wednesday-18-may-1-pm-cest-20220518",title:"Webinar: Introduction to Open Science | Wednesday 18 May, 1 PM CEST"},{slug:"step-in-the-right-direction-intechopen-launches-a-portfolio-of-open-science-journals-20220414",title:"Step in the Right Direction: IntechOpen Launches a Portfolio of Open Science Journals"},{slug:"let-s-meet-at-london-book-fair-5-7-april-2022-olympia-london-20220321",title:"Let’s meet at London Book Fair, 5-7 April 2022, Olympia London"},{slug:"50-books-published-as-part-of-intechopen-and-knowledge-unlatched-ku-collaboration-20220316",title:"50 Books published as part of IntechOpen and Knowledge Unlatched (KU) Collaboration"},{slug:"intechopen-joins-the-united-nations-sustainable-development-goals-publishers-compact-20221702",title:"IntechOpen joins the United Nations Sustainable Development Goals Publishers Compact"},{slug:"intechopen-signs-exclusive-representation-agreement-with-lsr-libros-servicios-y-representaciones-s-a-de-c-v-20211123",title:"IntechOpen Signs Exclusive Representation Agreement with LSR Libros Servicios y Representaciones S.A. de C.V"},{slug:"intechopen-expands-partnership-with-research4life-20211110",title:"IntechOpen Expands Partnership with Research4Life"},{slug:"introducing-intechopen-book-series-a-new-publishing-format-for-oa-books-20210915",title:"Introducing IntechOpen Book Series - A New Publishing Format for OA Books"}]},book:{item:{type:"book",id:"5191",leadTitle:null,fullTitle:"Artificial Neural Networks - Models and Applications",title:"Artificial Neural Networks",subtitle:"Models and Applications",reviewType:"peer-reviewed",abstract:"The idea of simulating the brain was the goal of many pioneering works in Artificial Intelligence. The brain has been seen as a neural network, or a set of nodes, or neurons, connected by communication lines. Currently, there has been increasing interest in the use of neural network models.\nThis book contains chapters on basic concepts of artificial neural networks, recent connectionist architectures and several successful applications in various fields of knowledge, from assisted speech therapy to remote sensing of hydrological parameters, from fabric defect classification to application in civil engineering. This is a current book on Artificial Neural Networks and Applications, bringing recent advances in the area to the reader interested in this always-evolving machine learning technique.",isbn:"978-953-51-2705-5",printIsbn:"978-953-51-2704-8",pdfIsbn:"978-953-51-4175-4",doi:"10.5772/61493",price:139,priceEur:155,priceUsd:179,slug:"artificial-neural-networks-models-and-applications",numberOfPages:414,isOpenForSubmission:!1,isInWos:1,isInBkci:!0,hash:"367a7a8daf581754dcd37bc588ec5cbf",bookSignature:"Joao Luis G. Rosa",publishedDate:"October 19th 2016",coverURL:"https://cdn.intechopen.com/books/images_new/5191.jpg",numberOfDownloads:32130,numberOfWosCitations:88,numberOfCrossrefCitations:80,numberOfCrossrefCitationsByBook:11,numberOfDimensionsCitations:119,numberOfDimensionsCitationsByBook:15,hasAltmetrics:1,numberOfTotalCitations:287,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"October 13th 2015",dateEndSecondStepPublish:"November 3rd 2015",dateEndThirdStepPublish:"February 7th 2016",dateEndFourthStepPublish:"May 7th 2016",dateEndFifthStepPublish:"June 6th 2016",currentStepOfPublishingProcess:5,indexedIn:"1,2,3,4,5,6,7,8",editedByType:"Edited by",kuFlag:!1,featuredMarkup:null,editors:[{id:"151889",title:"Dr.",name:"Joao Luis Garcia",middleName:null,surname:"Rosa",slug:"joao-luis-garcia-rosa",fullName:"Joao Luis Garcia Rosa",profilePictureURL:"https://mts.intechopen.com/storage/users/151889/images/4861_n.jpg",biography:'João Luís Garcia Rosa is an associate professor at the Department of Computer Science, University of São Paulo (USP) at Sao Carlos, Brazil, where he teaches disciplines such as Neural Networks, Brain-Computer Interfaces, and Artificial Intelligence. He received a degree in Electrical Engineering – Electronics and Automation, a Master\'s degree in Computer Engineering, and a PhD in Computational Linguistics, all from the University of Campinas (Unicamp), Brazil. He is currently with the Bio-inspired Computing Laboratory (BioCom). Dr. Rosa has experience in computer science, with emphasis on artificial Intelligence, brain-computer interfaces, and biologically plausible artificial neural networks. He presented three 2-hour tutorials in IJCNN 2005 ("Biologically Plausible Artificial Neural Networks"), in IJCNN 2015 ("Noninvasive Electroencephalogram-based Brain-Computer Interfaces”), and in IJCNN 2017 ("Event-Related Potentials: Cognition in Brain-Computer Interfaces"). He has published three books and several papers in journals and peer-reviewed proceedings.',institutionString:null,position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"1",totalChapterViews:"0",totalEditedBooks:"1",institution:{name:"University of Sao Paulo",institutionURL:null,country:{name:"Brazil"}}}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,coeditorOne:null,coeditorTwo:null,coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"605",title:"Machine Learning",slug:"numerical-analysis-and-scientific-computing-machine-learning"}],chapters:[{id:"51046",title:"Zhang Neural Networks for Online Solution of Time-Varying Linear Inequalities",doi:"10.5772/62732",slug:"zhang-neural-networks-for-online-solution-of-time-varying-linear-inequalities",totalDownloads:2218,totalCrossrefCites:1,totalDimensionsCites:1,hasAltmetrics:0,abstract:"In this chapter, a special type of recurrent neural networks termed “Zhang neural network” (ZNN) is presented and studied for online solution of time-varying linear (matrix-vector and matrix) inequalities. Specifically, focusing on solving the time-varying linear matrix-vector inequality (LMVI), we develop and investigate two different ZNN models based on two different Zhang functions (ZFs). Then, being an extension, by defining another two different ZFs, another two ZNN models are developed and investigated to solve the time-varying linear matrix inequality (LMI). For such ZNN models, theoretical results and analyses are presented as well to show their computational performances. Simulation results with two illustrative examples further substantiate the efficacy of the presented ZNN models for time-varying LMVI and LMI solving.",signatures:"Dongsheng Guo, Laicheng Yan and Yunong Zhang",downloadPdfUrl:"/chapter/pdf-download/51046",previewPdfUrl:"/chapter/pdf-preview/51046",authors:[{id:"179539",title:"Dr.",name:"Dongsheng",surname:"Guo",slug:"dongsheng-guo",fullName:"Dongsheng Guo"},{id:"184344",title:"Mr.",name:"Laicheng",surname:"Yan",slug:"laicheng-yan",fullName:"Laicheng Yan"},{id:"184345",title:"Dr.",name:"Yunong",surname:"Zhang",slug:"yunong-zhang",fullName:"Yunong Zhang"}],corrections:null},{id:"50570",title:"Bayesian Regularized Neural Networks for Small n Big p Data",doi:"10.5772/63256",slug:"bayesian-regularized-neural-networks-for-small-n-big-p-data",totalDownloads:3109,totalCrossrefCites:34,totalDimensionsCites:50,hasAltmetrics:0,abstract:"Artificial neural networks (ANN) mimic the function of the human brain and they have the capability to implement massively parallel computations for mapping, function approximation, classification, and pattern recognition processing. ANN can capture the highly nonlinear associations between inputs (predictors) and target (responses) variables and can adaptively learn the complex functional forms. Like other parametric and nonparametric methods, such as kernel regression and smoothing splines, ANNs can introduce overfitting (in particular with highly-dimensional data, such as genome wide association -GWAS-, microarray data etc.) and resulting predictions can be outside the range of the training data. Regularization (shrinkage) in ANN allows bias of parameter estimates towards what are considered to be probable. Most common techniques of regularizations techniques in ANN are the Bayesian regularization (BR) and the early stopping methods. Early stopping is effectively limiting the used weights in the network and thus imposes regularization, effectively lowering the Vapnik-Chervonenkis dimension. In Bayesian regularized ANN (BRANN), the regularization techniques involve imposing certain prior distributions on the model parameters and penalizes large weights in anticipation of achieving smoother mapping.",signatures:"Hayrettin Okut",downloadPdfUrl:"/chapter/pdf-download/50570",previewPdfUrl:"/chapter/pdf-preview/50570",authors:[{id:"179217",title:"Prof.",name:"Hayrettin",surname:"Okut",slug:"hayrettin-okut",fullName:"Hayrettin Okut"}],corrections:null},{id:"51466",title:"Generalized Regression Neural Networks with Application in Neutron Spectrometry",doi:"10.5772/64047",slug:"generalized-regression-neural-networks-with-application-in-neutron-spectrometry",totalDownloads:2453,totalCrossrefCites:3,totalDimensionsCites:8,hasAltmetrics:0,abstract:"The aim of this research was to apply a generalized regression neural network (GRNN) to predict neutron spectrum using the rates count coming from a Bonner spheres system as the only piece of information. In the training and testing stages, a data set of 251 different types of neutron spectra, taken from the International Atomic Energy Agency compilation, were used. Fifty-one predicted spectra were analyzed at testing stage. Training and testing of GRNN were carried out in the MATLAB environment by means of a scientific and technological tool designed based on GRNN technology, which is capable of solving the neutron spectrometry problem with high performance and generalization capability. This computational tool automates the pre-processing of information, the training and testing stages, the statistical analysis, and the post-processing of the information. In this work, the performance of feed-forward backpropagation neural networks (FFBPNN) and GRNN was compared in the solution of the neutron spectrometry problem. From the results obtained, it can be observed that despite very similar results, GRNN performs better than FFBPNN because the former could be used as an alternative procedure in neutron spectrum unfolding methodologies with high performance and accuracy.",signatures:"Ma. del Rosario Martinez-Blanco, Víctor Hugo Castañeda-Miranda,\nGerardo Ornelas-Vargas, Héctor Alonso Guerrero-Osuna, Luis\nOctavio Solis-Sanchez, Rodrigo Castañeda-Miranda, José María\nCelaya-Padilla, Carlos Eric Galvan-Tejada, Jorge Isaac Galvan-Tejada,\nHéctor René Vega-Carrillo, Margarita Martínez-Fierro, Idalia Garza-\nVeloz and Jose Manuel Ortiz-Rodriguez",downloadPdfUrl:"/chapter/pdf-download/51466",previewPdfUrl:"/chapter/pdf-preview/51466",authors:[{id:"19773",title:"Dr.",name:"Jose Manuel",surname:"Ortiz-Rodriguez",slug:"jose-manuel-ortiz-rodriguez",fullName:"Jose Manuel Ortiz-Rodriguez"},{id:"22531",title:"Dr.",name:"Maria Del Rosario",surname:"Martinez-Blanco",slug:"maria-del-rosario-martinez-blanco",fullName:"Maria Del Rosario Martinez-Blanco"},{id:"82380",title:"Dr.",name:"Hector Rene",surname:"Vega-Carrillo",slug:"hector-rene-vega-carrillo",fullName:"Hector Rene Vega-Carrillo"},{id:"183473",title:"Dr.",name:"Luis Octavio",surname:"Solis-Sanchez",slug:"luis-octavio-solis-sanchez",fullName:"Luis Octavio Solis-Sanchez"},{id:"189184",title:"MSc.",name:"Victor Hugo",surname:"Castañeda-Miranda",slug:"victor-hugo-castaneda-miranda",fullName:"Victor Hugo Castañeda-Miranda"},{id:"189185",title:"MSc.",name:"Gerardo",surname:"Ornelas-Vargas",slug:"gerardo-ornelas-vargas",fullName:"Gerardo Ornelas-Vargas"},{id:"189186",title:"MSc.",name:"Hector Alonso",surname:"Guerrero-Osuna",slug:"hector-alonso-guerrero-osuna",fullName:"Hector Alonso Guerrero-Osuna"},{id:"189187",title:"Dr.",name:"Jose Maria",surname:"Celaya-Padilla",slug:"jose-maria-celaya-padilla",fullName:"Jose Maria Celaya-Padilla"},{id:"189189",title:"Dr.",name:"Idalia",surname:"Garza-Veloz",slug:"idalia-garza-veloz",fullName:"Idalia Garza-Veloz"},{id:"189191",title:"Dr.",name:"Rodrigo",surname:"Castañeda-Miranda",slug:"rodrigo-castaneda-miranda",fullName:"Rodrigo Castañeda-Miranda"},{id:"189792",title:"Dr.",name:"Jorge Isaac",surname:"Galvan-Tejada",slug:"jorge-isaac-galvan-tejada",fullName:"Jorge Isaac Galvan-Tejada"},{id:"189793",title:"Dr.",name:"Carlos Eric",surname:"Galvan-Tejada",slug:"carlos-eric-galvan-tejada",fullName:"Carlos Eric Galvan-Tejada"},{id:"190887",title:"MSc.",name:"Celina Lizeth",surname:"Castañeda-Miranda",slug:"celina-lizeth-castaneda-miranda",fullName:"Celina Lizeth Castañeda-Miranda"},{id:"211746",title:"Dr.",name:"Margarita de la Luz",surname:"Martinez-Fierro",slug:"margarita-de-la-luz-martinez-fierro",fullName:"Margarita de la Luz Martinez-Fierro"}],corrections:null},{id:"52340",title:"A Continuous-Time Recurrent Neural Network for Joint Equalization and Decoding – Analog Hardware Implementation Aspects",doi:"10.5772/63387",slug:"a-continuous-time-recurrent-neural-network-for-joint-equalization-and-decoding-analog-hardware-imple",totalDownloads:2170,totalCrossrefCites:1,totalDimensionsCites:1,hasAltmetrics:0,abstract:"Equalization and channel decoding are “traditionally” two cascade processes at the receiver side of a digital transmission. They aim to achieve a reliable and efficient transmission. For high data rates, the energy consumption of their corresponding algorithms is expected to become a limiting factor. For mobile devices with limited battery’s size, the energy consumption, mirrored in the lifetime of the battery, becomes even more crucial. Therefore, an energy-efficient implementation of equalization and decoding algorithms is desirable. The prevailing way is by increasing the energy efficiency of the underlying digital circuits. However, we address here promising alternatives offered by mixed (analog/digital) circuits. We are concerned with modeling joint equalization and decoding as a whole in a continuous-time framework. In doing so, continuous-time recurrent neural networks play an essential role because of their nonlinear characteristic and special suitability for analog very-large-scale integration (VLSI). Based on the proposed model, we show that the superiority of joint equalization and decoding (a well-known fact from the discrete-time case) preserves in analog. Additionally, analog circuit design related aspects such as adaptivity, connectivity and accuracy are discussed and linked to theoretical aspects of recurrent neural networks such as Lyapunov stability and simulated annealing.",signatures:"Mohamad Mostafa, Giuseppe Oliveri, Werner G. Teich and Jürgen\nLindner",downloadPdfUrl:"/chapter/pdf-download/52340",previewPdfUrl:"/chapter/pdf-preview/52340",authors:[{id:"147655",title:"Prof.",name:"Jürgen",surname:"Lindner",slug:"jurgen-lindner",fullName:"Jürgen Lindner"},{id:"179497",title:"Dr.",name:"Mohamad",surname:"Mostafa",slug:"mohamad-mostafa",fullName:"Mohamad Mostafa"},{id:"185168",title:"Mr.",name:"Giuseppe",surname:"Oliveri",slug:"giuseppe-oliveri",fullName:"Giuseppe Oliveri"},{id:"185169",title:"Dr.",name:"Werner",surname:"Teich",slug:"werner-teich",fullName:"Werner Teich"}],corrections:null},{id:"50555",title:"Direct Signal Detection Without Data‐Aided: A MIMO Functional Network Approach",doi:"10.5772/63213",slug:"direct-signal-detection-without-data-aided-a-mimo-functional-network-approach",totalDownloads:1560,totalCrossrefCites:0,totalDimensionsCites:0,hasAltmetrics:0,abstract:"Functional network (FN) has been successfully applied in many fields, but so far no methods of direct signal detection (DSD) using FN have been published. In this chapter, a novel DSD approach using FN, which can be applied to cases with a plural source signal sequence, with short sequence, and even with the absence of a training sequence, is presented. Firstly, a multiple‐input multiple‐output FN (MIMOFN), in which the initial input vector is devised via QR decomposition of the receiving signal matrix, is constructed to solve the special issues of DSD. In the meantime, the design method for the neural function of this special MIMOFN is proposed. Then the learning rule for the parameters of neural functions is trained and updated by back‐propagation (BP) algorithm. The correctness and effectiveness of the new approach are verified by simulation results, together with some special simulation phenomena of the algorithm. The proposed method can detect the source sequence directly from the observed output data by utilizing MIMOFN without a training sequence and estimating the channel impulse response.",signatures:"Xiukai Ruan, Yanhua Tan, Yuxing Dai, Guihua Cui, Xiaojing Shi,\nQibo Cai, Chang Li, Han Li, Yaoju Zhang and Dameng Dai",downloadPdfUrl:"/chapter/pdf-download/50555",previewPdfUrl:"/chapter/pdf-preview/50555",authors:[{id:"179863",title:"Dr.",name:"Xiukai",surname:"Ruan",slug:"xiukai-ruan",fullName:"Xiukai Ruan"},{id:"180911",title:"Mrs.",name:"Yanhua",surname:"Tan",slug:"yanhua-tan",fullName:"Yanhua Tan"},{id:"185417",title:"Dr.",name:"Xiaojing",surname:"Shi",slug:"xiaojing-shi",fullName:"Xiaojing Shi"},{id:"185418",title:"Mr.",name:"Qibo",surname:"Cai",slug:"qibo-cai",fullName:"Qibo Cai"},{id:"185420",title:"Mr.",name:"Chang",surname:"Li",slug:"chang-li",fullName:"Chang Li"},{id:"185421",title:"Dr.",name:"Yuxing",surname:"Dai",slug:"yuxing-dai",fullName:"Yuxing Dai"},{id:"185422",title:"Dr.",name:"Han",surname:"Li",slug:"han-li",fullName:"Han Li"},{id:"185423",title:"Dr.",name:"Liming",surname:"Li",slug:"liming-li",fullName:"Liming Li"},{id:"185424",title:"Dr.",name:"Dameng",surname:"Dai",slug:"dameng-dai",fullName:"Dameng Dai"},{id:"186237",title:"Prof.",name:"Guihua",surname:"Cui",slug:"guihua-cui",fullName:"Guihua Cui"}],corrections:null},{id:"51277",title:"Artificial Neural Network as a FPGA Trigger for a Detection of Neutrino-Induced Air Showers",doi:"10.5772/63110",slug:"artificial-neural-network-as-a-fpga-trigger-for-a-detection-of-neutrino-induced-air-showers",totalDownloads:1894,totalCrossrefCites:0,totalDimensionsCites:2,hasAltmetrics:0,abstract:"Neutrinos play a fundamental role in the understanding of the origin of ultrahigh-energy cosmic rays (UHECR). They interact through charged and neutral currents in the atmosphere generating extensive air showers. However, the very low rate of events potentially generated by neutrinos is a significant challenge for detection techniques and requires both sophisticated algorithms and high-resolution hardware. We developed the FPGA trigger which is generated by a neural network. The algorithm can recognize various waveform types. It has been developed and tested on ADC traces of the Pierre Auger surface detectors. We developed the algorithm of artificial neural network on a MATLAB platform. Trained network that we implemented into the largest Cyclone V E FPGA was used for the prototype of the front-end board for the AugerPrime. We tested several variants, and the Levenberg–Marquardt algorithm (trainlm) was the most efficient. The network was trained: (a) to recognize ‘old’ very inclined showers (real Auger data were used as patterns for both positive and negative markers: for reconstructed inclined showers and for triggered by time over threshold (ToT), respectively, (b) to recognize ‘neutrino-induced showers’. Here, we used simulated data for positive markers and vertical real showers for negative ones.",signatures:"Zbigniew Szadkowski, Dariusz Głas and Krzysztof Pytel",downloadPdfUrl:"/chapter/pdf-download/51277",previewPdfUrl:"/chapter/pdf-preview/51277",authors:[{id:"67836",title:"Prof.",name:"Zbigniew Piotr",surname:"Szadkowski",slug:"zbigniew-piotr-szadkowski",fullName:"Zbigniew Piotr Szadkowski"},{id:"185396",title:"Dr.",name:"Dariusz",surname:"Głas",slug:"dariusz-glas",fullName:"Dariusz Głas"},{id:"185397",title:"Dr.",name:"Krzysztof",surname:"Pytel",slug:"krzysztof-pytel",fullName:"Krzysztof Pytel"}],corrections:null},{id:"50680",title:"From Fuzzy Expert System to Artificial Neural Network: Application to Assisted Speech Therapy",doi:"10.5772/63332",slug:"from-fuzzy-expert-system-to-artificial-neural-network-application-to-assisted-speech-therapy",totalDownloads:2204,totalCrossrefCites:3,totalDimensionsCites:6,hasAltmetrics:1,abstract:"This chapter addresses the following question: What are the advantages of extending a fuzzy expert system (FES) to an artificial neural network (ANN), within a computer‐based speech therapy system (CBST)? We briefly describe the key concepts underlying the principles behind the FES and ANN and their applications in assisted speech therapy. We explain the importance of an intelligent system in order to design an appropriate model for real‐life situations. We present data from 1‐year application of these concepts in the field of assisted speech therapy. Using an artificial intelligent system for improving speech would allow designing a training program for pronunciation, which can be individualized based on specialty needs, previous experiences, and the child's prior therapeutical progress. Neural networks add a great plus value when dealing with data that do not normally match our previous designed pattern. Using an integrated approach that combines FES and ANN allows our system to accomplish three main objectives: (1) develop a personalized therapy program; (2) gradually replace some human expert duties; (3) use “self‐learning” capabilities, a component traditionally reserved for humans. The results demonstrate the viability of the hybrid approach in the context of speech therapy that can be extended when designing similar applications.",signatures:"Ovidiu Schipor, Oana Geman, Iuliana Chiuchisan and Mihai Covasa",downloadPdfUrl:"/chapter/pdf-download/50680",previewPdfUrl:"/chapter/pdf-preview/50680",authors:[{id:"180248",title:"Dr.",name:"Oana",surname:"Geman",slug:"oana-geman",fullName:"Oana Geman"},{id:"181060",title:"Prof.",name:"Ovidiu-Andrei",surname:"Schipor",slug:"ovidiu-andrei-schipor",fullName:"Ovidiu-Andrei Schipor"},{id:"181064",title:"Dr.",name:"Iuliana",surname:"Chiuchisan",slug:"iuliana-chiuchisan",fullName:"Iuliana Chiuchisan"},{id:"185161",title:"Prof.",name:"Mihai",surname:"Covasa",slug:"mihai-covasa",fullName:"Mihai Covasa"}],corrections:null},{id:"50519",title:"Neural Networks for Gas Turbine Diagnosis",doi:"10.5772/63107",slug:"neural-networks-for-gas-turbine-diagnosis",totalDownloads:2231,totalCrossrefCites:5,totalDimensionsCites:4,hasAltmetrics:1,abstract:"The present chapter addresses the problems of gas turbine gas path diagnostics solved using artificial neural networks. As a very complex and expensive mechanical system, a gas turbine should be effectively monitored and diagnosed. Being universal and powerful approximation and classification techniques, neural networks have become widespread in gas turbine health monitoring over the past few years. Applications of such networks as a multilayer perceptron, radial basis network, probabilistic neural network, and support vector network were reported. However, there is a lack of manuals that summarize neural network applications for gas turbine diagnosis.",signatures:"Igor Loboda",downloadPdfUrl:"/chapter/pdf-download/50519",previewPdfUrl:"/chapter/pdf-preview/50519",authors:[{id:"179551",title:"Dr.",name:"Igor",surname:"Loboda",slug:"igor-loboda",fullName:"Igor Loboda"}],corrections:null},{id:"51130",title:"Application of Neural Networks (NNs) for Fabric Defect Classification",doi:"10.5772/63427",slug:"application-of-neural-networks-nns-for-fabric-defect-classification",totalDownloads:1899,totalCrossrefCites:4,totalDimensionsCites:4,hasAltmetrics:0,abstract:"The defect classification is as important as the defect detection in fabric inspection process. The detected defects are classified according to their types and recorded with their names during manual fabric inspection process. The material is selected as “undyed raw denim” fabric in this study. Four commonly occurring defect types, hole, warp lacking, weft lacking and soiled yarn, were classified by using artificial neural network (ANN) method. The defects were automatically classified according to their texture features. Texture feature extraction algorithm was developed to acquire the required values from the defective fabric samples. The texture features were assessed as the network input values and the defect classification is obtained as the output. The defective images were classified with an average accuracy rate of 96.3%. As the hole defect was recognized with 100% accuracy rate, the others were recognized with a rate of 95%.",signatures:"H. İbrahim Çelik, L. Canan Dülger and Mehmet Topalbekiroğlu",downloadPdfUrl:"/chapter/pdf-download/51130",previewPdfUrl:"/chapter/pdf-preview/51130",authors:[{id:"89349",title:"Prof.",name:"Lale Canan",surname:"Dülger",slug:"lale-canan-dulger",fullName:"Lale Canan Dülger"},{id:"178353",title:"Dr.",name:"Halil",surname:"Çelik",slug:"halil-celik",fullName:"Halil Çelik"},{id:"185835",title:"Prof.",name:"Mehmet",surname:"Topalbekiroğlu",slug:"mehmet-topalbekiroglu",fullName:"Mehmet Topalbekiroğlu"}],corrections:null},{id:"50967",title:"Thunderstorm Predictions Using Artificial Neural Networks",doi:"10.5772/63542",slug:"thunderstorm-predictions-using-artificial-neural-networks",totalDownloads:2119,totalCrossrefCites:4,totalDimensionsCites:4,hasAltmetrics:0,abstract:"Artificial neural network (ANN) model classifiers were developed to generate ≤15h predictions of thunderstorms within three 400-km2 domains. The feed-forward, multi-layer perceptron and single hidden layer network topology, scaled conjugate gradient learning algorithm, and the sigmoid (linear) transfer function in the hidden (output) layer were used. The optimal number of neurons in the hidden layer was determined iteratively based on training set performance. Three sets of nine ANN models were developed: two sets based on predictors chosen from feature selection (FS) techniques and one set with all 36 predictors. The predictors were based on output from a numerical weather prediction (NWP) model. This study amends an earlier study and involves the increase in available training data by two orders of magnitude. ANN model performance was compared to corresponding performances of operational forecasters and multi-linear regression (MLR) models. Results revealed improvement relative to ANN models from the previous study. Comparative results between the three sets of classifiers, NDFD, and MLR models for this study were mixed—the best performers were a function of prediction hour, domain, and FS technique. Boosting the fraction of total positive target data (lightning strikes) in the training set did not improve generalization.",signatures:"Waylon G. Collins and Philippe Tissot",downloadPdfUrl:"/chapter/pdf-download/50967",previewPdfUrl:"/chapter/pdf-preview/50967",authors:[{id:"179979",title:"Mr.",name:"Waylon",surname:"Collins",slug:"waylon-collins",fullName:"Waylon Collins"},{id:"179981",title:"Dr.",name:"Philippe",surname:"Tissot",slug:"philippe-tissot",fullName:"Philippe Tissot"}],corrections:null},{id:"50486",title:"Analyzing the Impact of Airborne Particulate Matter on Urban Contamination with the Help of Hybrid Neural Networks",doi:"10.5772/63109",slug:"analyzing-the-impact-of-airborne-particulate-matter-on-urban-contamination-with-the-help-of-hybrid-n",totalDownloads:1913,totalCrossrefCites:1,totalDimensionsCites:8,hasAltmetrics:0,abstract:"In this study, particulate matter (PM), total suspended particulate (TSP), PM10, and PM2.5 fractions) concentrations were recorded in various cities from south of Romania to build the corresponding time series for various intervals. First, the time series of each pollutant were used as inputs in various configurations of feed-forward neural networks (FANN) to find the most suitable network architecture to the PM specificity. The outputs were evaluated using mean absolute error (MAE), mean absolute percentage error (MAPE), root mean square error (RMSE), and Pearson correlation coefficient (r) between observed series and output series. Second, each time series was decomposed using Daubechies wavelets of third order into its corresponding components. Each decomposed component of a PM time series was used as input in the optimal feed-forward neural networks (FANN) architecture established in the first step. The output of each component was re-included to form the modeled series of the original pollutant time series.",signatures:"Daniel Dunea and Stefania Iordache",downloadPdfUrl:"/chapter/pdf-download/50486",previewPdfUrl:"/chapter/pdf-preview/50486",authors:[{id:"82418",title:"Prof.",name:"Stefania Felicia",surname:"Iordache",slug:"stefania-felicia-iordache",fullName:"Stefania Felicia Iordache"},{id:"180202",title:"Associate Prof.",name:"Daniel",surname:"Dunea",slug:"daniel-dunea",fullName:"Daniel Dunea"}],corrections:null},{id:"50563",title:"Neural Networks Applications for the Remote Sensing of Hydrological Parameters",doi:"10.5772/63165",slug:"neural-networks-applications-for-the-remote-sensing-of-hydrological-parameters",totalDownloads:1610,totalCrossrefCites:4,totalDimensionsCites:5,hasAltmetrics:1,abstract:"The main artificial neural networks (ANN)‐based retrieval algorithms developed at the Institute of Applied Physics (IFAC) are reviewed here. These algorithms aim at retrieving the main hydrological parameters, namely the soil moisture content (SMC), the plant water content (PWC) of agricultural vegetation, the woody volume of forests (WV) and the snow depth (SD) or snow water equivalent (SWE), from data collected by active (SAR/scatterometers) and passive (radiometers) microwave sensors operating from space. Taking advantage of the fast computation, ANN are able to generate output maps of the target parameter at both local and global scales, with a resolution varying from hundreds of meters to tens of kilometres, depending on the considered sensor. A peculiar strategy adopted for the training, which has been obtained by combining satellite measurements with data simulated by electromagnetic models (based on the radiative transfer theory, RTT), made these algorithms robust and site independent. The obtained results demonstrated that ANN are a powerful tool for estimating the hydrological parameters at different spatial scales, provided that they have been trained with consistent datasets, made up by both experimental and theoretical data.",signatures:"Emanuele Santi",downloadPdfUrl:"/chapter/pdf-download/50563",previewPdfUrl:"/chapter/pdf-preview/50563",authors:[{id:"180474",title:"Dr.",name:"Emanuele",surname:"Santi",slug:"emanuele-santi",fullName:"Emanuele Santi"}],corrections:null},{id:"51330",title:"Advanced Methods in Neural Networks-Based Sensitivity Analysis with their Applications in Civil Engineering",doi:"10.5772/64026",slug:"advanced-methods-in-neural-networks-based-sensitivity-analysis-with-their-applications-in-civil-engi",totalDownloads:2420,totalCrossrefCites:13,totalDimensionsCites:18,hasAltmetrics:0,abstract:"Artificial neural networks (ANNs) are powerful tools that are used in various engineering fields. Their characteristics enable them to solve prediction, regression, and classification problems. Nevertheless, the ANN is usually thought of as a black box, in which it is difficult to determine the effect of each explicative variable (input) on the dependent variables (outputs) in any problem. To investigate such effects, sensitivity analysis is usually applied on the optimal pre-trained ANN. Existing sensitivity analysis techniques suffer from drawbacks. Their basis on a single optimal pre-trained ANN model produces instability in parameter sensitivity analysis because of the uncertainty in neural network modeling. To overcome this deficiency, two successful sensitivity analysis paradigms, the neural network committee (NNC)-based sensitivity analysis and the neural network ensemble (NNE)-based parameter sensitivity analysis, are illustrated in this chapter. An NNC is applied in a case study of geotechnical engineering involving strata movement. An NNE is implemented for sensitivity analysis of two classic problems in civil engineering: (i) the fracture failure of notched concrete beams and (ii) the lateral deformation of deep-foundation pits. Results demonstrate good ability to analyze the sensitivity of the most influential parameters, illustrating the underlying mechanisms of such engineering systems.",signatures:"Maosen Cao, Nizar F. Alkayem, Lixia Pan and Drahomír Novák",downloadPdfUrl:"/chapter/pdf-download/51330",previewPdfUrl:"/chapter/pdf-preview/51330",authors:[{id:"180549",title:"Prof.",name:"Maosen",surname:"Cao",slug:"maosen-cao",fullName:"Maosen Cao"},{id:"180560",title:"Dr.",name:"Lixia",surname:"Pan",slug:"lixia-pan",fullName:"Lixia Pan"},{id:"180562",title:"Dr.",name:"Nizar Faisal",surname:"Alkayem",slug:"nizar-faisal-alkayem",fullName:"Nizar Faisal Alkayem"}],corrections:null},{id:"51286",title:"Artificial Neural Networks in Production Scheduling and Yield Prediction of Semiconductor Wafer Fabrication System",doi:"10.5772/63444",slug:"artificial-neural-networks-in-production-scheduling-and-yield-prediction-of-semiconductor-wafer-fabr",totalDownloads:2056,totalCrossrefCites:3,totalDimensionsCites:4,hasAltmetrics:0,abstract:"With the development of artificial intelligence, the artificial neural networks (ANN) are widely used in the control, decision‐making and prediction of complex discrete event manufacturing systems. Wafer fabrication is one of the most complicated and high competence manufacturing phases. The production scheduling and yield prediction are two critical issues in the operation of semiconductor wafer fabrication system (SWFS). This chapter proposed two fuzzy neural networks for the production rescheduling strategy decision and the die yield prediction. Firstly, a fuzzy neural network (FNN)‐based rescheduling decision model is implemented, which can rapidly choose an optimized rescheduling strategy to schedule the semiconductor wafer fabrication lines according to the current system disturbances. The experimental results demonstrate the effectiveness of proposed FNN‐based rescheduling decision mechanism approach over the alternatives (back‐propagation neural network and Multivariate regression). Secondly, a novel fuzzy neural network‐based yield prediction model is proposed to improve prediction accuracy of die yield in which the impact factors of yield and critical electrical test parameters are considered simultaneously and are taken as independent variables. The comparison experiment verifies the proposed yield prediction method improves on three traditional yield prediction methods with respect to prediction accuracy.",signatures:"Jie Zhang, Junliang Wang and Wei Qin",downloadPdfUrl:"/chapter/pdf-download/51286",previewPdfUrl:"/chapter/pdf-preview/51286",authors:[{id:"180966",title:"Prof.",name:"Jie",surname:"Zhang",slug:"jie-zhang",fullName:"Jie Zhang"},{id:"188119",title:"Mr.",name:"Junliang",surname:"Wang",slug:"junliang-wang",fullName:"Junliang Wang"},{id:"188120",title:"Dr.",name:"Wei",surname:"Qin",slug:"wei-qin",fullName:"Wei Qin"}],corrections:null},{id:"51444",title:"Neural Network Inverse Modeling for Optimization",doi:"10.5772/63678",slug:"neural-network-inverse-modeling-for-optimization",totalDownloads:2280,totalCrossrefCites:4,totalDimensionsCites:4,hasAltmetrics:0,abstract:"In this chapter, artificial neural networks (ANNs) inverse model is applied for estimating the thermal performance () in parabolic trough concentrator (PTC). A recurrent neural network architecture is trained using the Kalman Filter learning from experimental database obtained from PTCs operations. Rim angle (φr), inlet (Tin), outlet (Tout) fluid temperatures, ambient temperature (Ta), water flow (Fw), direct solar radiation (Gb) and the wind velocity (Vw) were used as main input variables within the neural network model in order to estimate the thermal performance with an excellent agreement (R2=0.999) between the experimental and simulated values. The optimal operation conditions of parabolic trough concentrator are established using artificial neural network inverse modeling. The results, using experimental data, showed that the recurrent neural network (RNN) is an excellent tool for modeling and optimization of PTCs.",signatures:"Oscar May, Luis J. Ricalde, Bassam Ali, Eduardo Ordoñez López,\nEduardo Venegas-Reyes and Oscar A. 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\r\n\tSolid waste management has been a wide area of research that has attracted the attention of many scientists over the past few decades. Municipal solid waste, which has traditionally been studied the most, is a stream that, by weight, is at relatively low percentages compared to the total amounts of solid wastes generated worldwide. Emphasis is lately given on special solid waste streams that may, or may not, have hazardous properties. The aspect of sustainability has been particularly introduced into solid waste management during the past two decades. For example, “sustainable landfilling” was a term introduced during the nineties to suggest the use of stabilization techniques before landfilling to reduce landfill emissions.
\r\n
\r\n\tThis book, therefore, intends to provide the reader with a comprehensive overview of the current trends of research that aims to focus on this diverse nature of sustainable solid waste management: from valorization techniques to legal, economic, and behavioral aspects and from LCA to quality assessment methods.
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From chapter submission and review to approval and revision, copyediting and design, until final publication, I work closely with authors and editors to ensure a simple and easy publishing process. I maintain constant and effective communication with authors, editors and reviewers, which allows for a level of personal support that enables contributors to fully commit and concentrate on the chapters they are writing, editing, or reviewing. I assist authors in the preparation of their full chapter submissions and track important deadlines and ensure they are met. I help to coordinate internal processes such as linguistic review, and monitor the technical aspects of the process. As an ASM I am also involved in the acquisition of editors. 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1. Introduction
Multi-metallic mine wastes from mining activities have been produced in large quantities and disposed on soils for centuries all over the world, most of the times in a non-environmentally safe way. When exposed to environmental factors like rain and air mine tails undergo continuous chemical changes involving acid–base, redox, sorption-dissolution, and complexation equilibria increasing both, the (bio)-availability levels of specific metals to local biota, and the metal mobility, increasing the risk of extending the polluting effects to ground water and adjacent soils, affecting all forms of life. Biochar additions to soils and mine wastes have proved to be useful for mitigating the negative effects of metal phytotoxicity by augmenting the active surface and number of new sorption sites for metal retention and increasing pH of the once acidic metal-sulfidic mine wastes that would otherwise hamper the growth of vegetation. Among other beneficial effects of biochar additions, the increase of residence time of C in soils should be mentioned. The methodologic approach presented here shows a sound proposal of how a remediation strategy can be instrumented to agriculturally stabilize and reclaim acidic metal mine wastes and polluted soils. By taking advantage of many of the relevant biochar characteristics and properties that have proved to be instrumental when used, alone or in combination with fertilizers and other soil amendments (e.g., lime, gypsum, compost, etc.), to lower metal toxic levels, and modify the relevant physicochemical waste and soil characteristics and properties. Firstly, we focus on mitigating the phytotoxic effects of the bioavailable essential and toxic heavy metal (Cu, Zn, Pb, Cd, etc.) deposited on the acid mine tailing dams, and secondly, on creating a” fertile environment” by reconditioning agriculturally, the HM-polluted acidic mine waste, to allow metal sensitive higher plant species to grow, so that the more resistant native vegetation, or other reforesting species, can regrow on the reclaimed site, based on the successful bioassay tests performed. Pyrolyzed material derived from high-rate growth plants (water hyacinth, E. crassipes Mart); Eucalyptus, (E. globulus Labill), among others, have become of ecological relevance due to their unwanted proliferation in many terrestrial, lacustrine or riverine environments all over the planet, so that the proposal considers not only neutralizing the mine tailings and abating the toxic levels of specific heavy metals (HM) like Pb, Cd, Cu, Zn, etc., to fulfill the international and national standards and norms, but to conveniently combine biochar based on these type of plant materials, with widely used soil amendments to pass any of the widely recognized biological tests of growth using HM-sensitive plants, earthworms (Eisenia fetida/Eisenia andrei by dermal and alimentary uptake), acute toxicity test, etc., among others. The approach addresses firstly: a) characterizing physiochemically mine tailings, in terms of their relevant physical and chemical parameters and properties, i.e., metal speciation and contents, potential acidity, chemical oxygen demand, metal-biochar sorption-complexing affinities, neutralization kinetics, etc., to compare and establish definitive results of doses, etc., and secondly; b) establishing conditions for biochar production and pyrolysis so that optimal neutralization potential and surface for HM-sorption interactions can optimally be obtained.
2. Mine waste and metalliferous acid mine drainage
Mining extraction of metals from sulfidic materials produce considerable levels of potential acidity which eventually, if not prevented and neutralized, will generate the so-called metalliferous acid mine drainage resulting in the production of acidic water and mobilization of heavy metals [1, 2]. The quantity of acid-forming minerals found in many mines of central Mexico around the neo-volcanic mountainous axis [3, 4] and around the world, include dominantly pyrite (FeS2), galena (PbS), sphalerite (ZnS), pyrrhotites (Fe1-xS), chalcopyrite (CuFeS2), arsenopyrite (AsFeS), bornite (Cu5FeS4), and many other metallic sulfosalts. After oxidation, these minerals generate the H+-producing redox and hydrolytic processes of the components (e.g., S, Fe, Mn, Zn, Cu, Pb, etc.), left behind in the mine tailings. Mine wastes and tailings, polluted sites and pristine-soils (for reference and comparison) must then be chemically characterized in their metal speciation and contents, besides other relevant physicochemical properties and parameters, i.e., pH, Electrical Conductivity (EC), Cation Exchange Capacity (CEC), Acid Neutralizing Capacity (ANC), Chemical Oxygen Demand (COD)-value, etc. before any remediation technique is planned or executed. Metal speciation and fractionation must also be carefully considered so that the so-called bioavailable, labile-toxic metal fractions and pools (soluble, exchangeable, DTPA-, acid-extractable, total metal content, etc.) must correlate well with the requirements of clean up and agrostabilization of sites.
2.1 Chemical characterization of mine wastes for remediation
Routinely acid–base account (ABA) is determined to specify the total quantity of acid-forming sulfur compounds in a sample relative to the neutralizing potential [1, 2]. Acid–base account methods are applied routinely to mine waste analysis of materials to assess the potential of generating acid upon redox weathering processes. Acid–base account is evaluated by determining the neutralization potential (NP) and potential acidity (PA) of a sample: ABA = NP–PA [5]. However, when common sulfide and sulfate minerals are subjected to ABA extraction methods, the ABA method fails to accurately distinguish the acid-forming from nonacid-forming minerals, resulting in errors in the determination of potential acidity mainly because the lack of consideration of all possible acid-producing species that very slowly oxidize. These errors can be subsequently visualized not only in the discrepancies between NP- and COD-values measured in a sample, but in the inaccurate liming requirements predicted to be applied, resulting not only in insufficient neutralizing amounts required and an excessive cost to cover the slowly released and underestimated potential acidity, but in the potential reclamation failure when the ABA measurement is underestimated. In this respect, the methods regularly used to determine the acidity potential, involve the acid–base treatment of a mine waste and polluted and pristine soil samples, without considering, on one hand, the kinetics or slow neutralization reactions that with time might occur, and the slow oxidation of other components which contribute to waste acidification [6]. In our proposal we measure and determine the neutralization-kinetic curve of the acidic mine waste with lime and biochar, or other amendments applied, so that the time of reaction under laboratory conditions can be considered and extrapolated to green house and field experiments. Figure 1 shows such a neutralization curve for an acidic mine waste from Zimapan, Hidalgo State, Mexico, which showed initially very low pH values.
Figure 1.
Graphs show neutralization (pH-mmolc of OH−) and kinetic (pH-time, in days) curves of an acid mine waste from Zimapan, Hidalgo State, Mexico with lime, Ca(OH)2 whose initial pH value was 2.4. Solid:liquid mixture ratios were 1:3, in small polyethylene reactor flasks with cap. Ten flasks were prepared to which various dose of liming material was added at variable levels of 0–67.5 mmolc of Ca(OH)2, which were kept incubated for the time period described. pH was monitored over time. As an example (see [6]) of curves, some flask-systems results were plotted [6].
These discrepancies have been recorded [5, 6, 7] between the acidity potential (AP) and the COD-values. In a freshly sample taken from the site at Zimapan mine in Mexico, whose initial pH, AP (ABA) and neutralization potential (NP) values were 6.9, 348 kgCaCO3 ton−1 and 201 kgCaCO3 ton−1, respectively, calculation of the acid–base balance produced a ratio of NP/AP < 1.2 (=0.58), revealing a potential for acid mine drainage generation resulting from the eventual oxidation of sulfides to sulfates according to reactions of the type e.g., S−II + 3/₂O2 + H2O⇆SO42− + 2H+, and the hydrolysis of the ferric ions, Fe3+, (Fe3++3H2O⇆Fe(OH)3 + 3H+). These values were found to be within the range of reported levels for mine tailings deposited in mining areas of central Mexico, whose acid–base balance usually lays between 0.1 and 0.9, and already present acid drainage production [8], as well as with values reported specifically for the mining area that are at 0.3 being considered as eventually acidic waste [9]. As a complement, the chemical oxygen demand, COD, corroborated an extra potential risk of acid drainage generation due to the slow oxidation processes of the mine residues. The COD-value of this sample was of 17 kg K2Cr2O7 ton−1, equivalent to 12% of S(-II) content (unpublished results), assuming that all the oxidable material was pyrite, and therefore to 376 kgCaCO3 ton−1 waste is calculated leading to an extra amount of liming material of 28 kgCaCO3 ton−1 (= COD-AP), expressed as potential acidity. Thus, despite being a recently neutralized the fresh waste, in the medium or long term, the deficit in the acid–base balance and the high COD value must be considered as indicators of the potential oxidation of metal sulfides. Besides, the kinetic factor would lead to a ∆pH/43 days of 0.9 units, which would correspond to an extra amount of an extra 4.5 mmolc (= 5.5 kgCaCO3 ton−1 waste) to compensate for a kinetic period of 60 days under laboratory conditions, resulting in total an extra amount of 22.8% more liming material. In close comparison with an acidified sample of the same site at Zimapan mine, calculations showed (see [6, 7]) original values of pH, AP, NP and COD-values, to be 2.2, 38.1kgCaCO3 ton−1, 109 kgCaCO3 ton−1, and 146 kgK2Cr2O7 ton−1, equivalent to still 1.2% S−II content to be yet oxidable, if all materials were pyrite. Following similar calculations as above, the amount liming material required to neutralize this naturally oxidized mine waste would be estimated to be in the order of 37.5 kgK2Cr2O7 ton−1 (plus the kinetic dose of 5.5 kgK2Cr2O7 ton−1), giving a total of 43 kgK2Cr2O7 ton−1 [6, 7]. The eventual production of acid drainage conditions and the consequent availability and potential mobilization of the toxic metals contained in the waste material can only be prevented when the three aspects of analysis are considered: the ABA- and COD-value, and the kinetics of neutralization factor. From that it results clear that precise and full characterization of these determinations must be considered if a successful remediation of acidic mine tailings is planned. Besides the natural tendency of field researchers to apply lime on mine tailing dams, several studies have shown that some metal can be re-speciated causing some redissolution, as lime is a more soluble material than other precipitates, adsorbing or complexing amendments as phosphates, biosolids, compost, clays or biochar, alone or in combination, which has conducted many researchers to look for alternative ways of immobilizing metals in mine wastes [10, 11, 12, 13]. We have carried out studies to prove this [7]. After applying lime, gypsum, phosphates and organic matter (compost) it was corroborated that lime and gypsum (results not shown) caused some redistribution and redissolution of metals. Figure 2 shows for lime, when applied to local pristine soil-mine waste mixtures, ranging from 100:0% to 0:100% soil (s): mine waste (mw) mixtures. Adsorption experiments carried out on these soil-wastes emulate the various grades of pollution caused by the dispersion of the mine waste over clean unpolluted soil.
Figure 2.
Comparison of the relative effect of low, medium and high doses of lime versus the non-limed treatment, on the 0.2 N acetic acid (AcO)-extractable (Ex-) Pb, Zn, Cd and Cu levels for six experimental mixtures (mx) of soil (s)/mine waste (mw): A: 100% soil, B: 80:20 s:mw, C: 60:40 s:mw, D: 40:60 s:mw, E: 20:80 s:mw, F: 100% mw. Freshly deposited mine waste was sampled, showing a pH value of 7.37 (see [7]).
Graphs shows the effect that lime had over the desorption of the four studied metals. Curves show that as mixtures were limed at low, medium and high doses (where low, medium and high doses were chosen to suppress the summation of water-soluble, acid-extractable and DTPA-extractable heavy metals respectively), metals were, in all cases extracted in higher amounts as compared with the no-limed treatment, suggesting this amendment material serves well to neutralize the acidic mine waste, but fails to suppress the extractability of metals with respect to the non-limed fresh mine waste treatments. Results (not shown) for systems containing phosphates and organic matter (compost) effectively lowered the availability of these four metals, as other researchers have reported too [10, 11, 12, 13]. Further experiments were planned to continue with this research to test the effectiveness of biochar in combination with lime and phosphate [14, 15]. Results have been published elsewhere but conclusions are presented in our case of study included in Section 4 of this chapter.
2.2 Toxic heavy metals in mine tailings
To lessen HM toxicity hazards several studies involving physical temporary solutions [16, 17]; a wide variety of chemical treatments [18, 19]; and the not always feasible biological techniques [20, 21] have been conducted and published. Physical treatments include not only confining, solidification and vitrification procedures [16, 17] but S/S technologies which in many cases are considered not to be a permanent environmental solution as metals are not removed from contaminated media; always require future monitoring and; there is a questionable longevity of the effect of the ameliorating materials added plus requiring long-term management of resulting materials based on landfilling and soil caps to prevent erosion [16, 17]. On the other hand, chemical procedures used specially for polluted sites are generally based on precipitation [22], adsorption [23] or complexation processes [24]; this last to either mobilize and bioremove HM effectively. These physical and chemical procedures, if integrally and congruently used, should have an important impact on the abiotic and biotic factors, so that the toxicity of metals left after the treatments is reduced and an attractive growing media for phytoremediation can then be promoted and established. For soils most procedures used to diminish the mobility and leaching potential of HM have used chemical remediation techniques. Several studies report an effective immobilization of HM in polluted soils when applying lime, phosphate and/or organic matter amendments were applied, resulting in a reduced bioavailability of HM [25, 26, 27, 28]. Addition of phosphate materials for instance was effective in immobilizing Pb [29]; whereas composts, biosolids, manure and peat materials [8, 9, 10, 30] were instrumental to reduce mobility of Cd, Pb and Zn, among other HM [31].
3. Agrostabilization of mine waste and polluted soils
Among the most promising remediation techniques to treat heavy metal polluted wastes and soil used are the application of lime [32], phosphates [29, 33], biosolids [34, 35], composts [36] and the application of amendments with biochar [12, 15, 37]. Although the application of biosolids and composts decreases the bioavailability of metals, their effect is variable depending on the metal, soil type, dose, type, and degree of humification of organic matter [38, 39]. Most of these techniques require constant applications to ensure their success. Other studies [40] have demonstrated that fresh composts increased the solubility of metals, except perhaps for Cu [7], so that pretreatments are required to stabilize organic manufacturing, which increase application costs [36]. These above studies considered the addition of ameliorating materials to reduce chemically the HM bioavailability, however if the addition of carefully selected agrochemical materials and doses is premeditated the remediation strategy should warrant in an initial step: 1) a stable and slow mobilization of bio-available HM; 2) the abatement and control of their toxic levels at least based on the threshold allowable levels dictated by the national and international standards and norms and; 3) a fertile media to sustain a consistent phytoremediation or phytomining activities, for instance through the use of HM sensitive indicator plant species according to standardized biological test methods [41, 42], or through the use of hyperaccumulator plants, respectively. Once this strategy works, and a well-nourished growing media is assured, a further important step should be funded in a studied introduction of perennial domesticated, native and/or undomesticated plant species whether HM hyperaccumulators or not. For acidic polluted mine wastes, studies should focus mainly on lowering the mobility of Cd, Cu, Pb, and Zn below official environmentally safe values to warrant a biologically clean and sustainable ecosystem. To reach this goal, at least two schemes must be visualized; First the addition of widely used agronomic materials consisting of lime (Ca(OH)2); gypsum (CaSO4·2H2O); P-fertilizer (KH2PO4) and/or compost, and more recently with much success biochar, to “treat” a gradient of soil-fresh mine tailings mixtures in order to assess the treatment effectiveness to lower both the most toxic metal species in solution, the free-metal ion chemical activity, (M2+), of metals like Cd2+, Cu2+, Pb2+ and Zn2+ [43] and the so called bio-available (acid-extractable) HM fraction imposed by international standards and norms. Second, a bioassay should be carried out to find the conditions to pass sensitive indicator plant response tests in these “fertile” ameliorated media. These studies should prove to be useful in deriving soil-substrate quality criteria to establish specific cleanup strategies and/or verify the success of remediation processes. In order to evaluate metal toxicity/abatement effectively both, the bioavailable (acid-extractable) HM fraction and the chemical activity of the free metal ion, (Mm+) should be measured after incubation with the chemical-agronomic treatments mentioned above. Green house experiments and field trials are the next important steps to establish a well-founded remediation strategy.
3.1 Lime
The application of lime as ameliorating material alone or in combination with compost, initially increases pH values, lowers metal solubilities and buffers the changes of the acid–base equilibria. In addition, their low-cost and easily accessible and application aspects [10] favors at first instance their use, however, due to the transient nature of organic matter, its effectiveness might decrease afterwards [11]. Although excess liming may also lead to P-deficiency in plants, an excess of mineralization of labile carbon is also possible when lime is mixed with biosolids promoting the availability of P [12]. Several authors have tested this material in combination with-red mud (a by-product of aluminum manufacturing) [10], compost from water hyacinth [11], biochar and biosolids [12]. These studies coincide that the addition of lime is effective, but it is enhanced with mixed with other amendments. For example, Trippe, et al. (2021) (see [12]), showed that the above and belowground biomass of plants grown in mine tailings amended with lime, biochar and biosolids, was 3–4 times larger than the biomass of plants grown in tailings amended only with lime.
3.2 Phosphate fertilizers
The application of phosphates to metalliferous polluted wastes and soils is intended to form stable precipitates with metals, at the time of providing essential nutritional elements for the growth of the plant cover. For instance (see [44, 45, 46]). Compared to the control, they found that all P amendments significantly decreased relatively Pb phytoavailability up to 86%. The Pb immobilization was attributed to sorption and precipitates of Pb phosphate on calcite and phosphate phases and minerals. Water solubility of Cu and Zn was also lowered up to 80% and 69%, respectively. On the other hand, it has been put into discussion whether metals should be immobilized or not. Other studies have also addressed the remediation of heavy metals and metalloids of contaminated soils, to mobilize or to immobilize them by adding amendments or complexing substances, respectively. Of course, the final fate of metals becomes critical, whether they will be immobilized to mitigate the potential toxic effects on biota, or to increase their phytoavailability so that metals can be phytoextracted or leached them out from the system. In terms of adding phosphates to Pb-polluted environments, certainly it promotes Pb-immobilization, although the availability of other metals, still need to be addressed specifically, especially Cu.
3.3 Compost and biosolids
Some studies [38] have shown that the application of biosolids and compost decreases the bioavailability of some metals, but their effect is variable depending on the metal, soil type, dose, and degree of organic matter humification. However, some contrasting effects of manure and compost on soil pH, heavy metal availability and growth have also been recorded in soils contaminated by pyritic mine waste [39], so that in terms of specific metals, there are accounts signaling that some metals certainly are complexed and retain on organic material (e.g., Cu), but others not. The problem related to sewage sludge application arises when it contains high concentrations of potentially toxic heavy metals. The release of heavy metals associated with sewage sludge is strongly influenced by soil pH, cation exchange capacity, organic matter, and mobility and speciation of specific metals. Excessive application of sewage sludge to soil has been found to increase the bioavailability of heavy metals, but the low doses of sewage sludge did not cause a significant increase in heavy metal concentrations [47]. Although application of biosolids provides essential nutrients for plant growth, a careful assessment of the characteristics of sewage sludge, however, is required prior to land application. When sludge contains high concentrations of toxic elements, amendments may have a potential toxic impact. Co-application of organic matter, liming, phosphates, biochar, etc. may minimize the potential negative impact of land application of biosolids too. This last study [47] also showed that sewage sludge pyrolysis decreased the plant-availability, the mobile forms and the risk of leaching of Cu, Ni, Zn and Cd. Important to notice that the leaching of Cu, Ni and Zn were lower in the soil treated with biochar that in sewage sludge treatment. When mixed biosolids and biochar amendments increased soil respiration with respect to the control soil, being lower in the case of biochar than when biosolid was added alone. On the contrary, biochar amended samples reduced Ni, Zn, Cd and Pb plant availability, when compared to sewage sludge amended samples. It results clear then, that biosolids, at low dose have a good influence in soil than biochar alone, in that particular case, however, it also results clear that sewage sludge when mixed with biochar can have better results to lower metal availability for plants. Beneficial effects can be obtained when biochar is incorporated to the application of amendments.
3.4 Clays
Clays have been tested to remediate heavy metals contaminated soils too. Their use has been recommended because of the low cost, clay materials can easily be obtained, and result innocuous to the environment. Among these, bentonite, montmorillonite, attapulgite [48], palygorskite, sepiolite [49], illites and kaolinites [50] can also be mentioned. It has been observed that sepiolite can increase the pH of systems due to its alkaline nature, it is rich in oxides and carbonates of Ca, Mg, Al and Si, and it improves microbial activity in soils contaminated with mining residues [51]. Nevertheless, the main characteristic clays impose on treatments are related to those factors that influence the adsorption of heavy metals on clays. According to Otunola and Ololade, 2020 [50] these are: a) increase of cation exchange capacity (CEC) and the specific surface area of the clay, which are the determining properties of sorption; b) longer contact times between the clay and the contaminated site, both related to the type of metal and the pH value of the site; c) moderate dose of clay, being 4 to 8% to remove more than 70% of heavy metals [52]; d) increase of pH of the system or the site, as it influences the leaching of cationic metals. The best absorption they mentioned was between pH values of 6 to 8 [53]. The increase of pH generates negatively charged sorption sites on soil colloids and on the surface of organic matter which favors adsorption of the HM’s [54]; and e) the temperature that influences the amount of adsorbed metal, being lower when temperature is greater than 36°C [49]. Nowadays, methods have been designed to modify the adsorption capacity, although it is not yet known which is the best modification method for each type of clay and the required dose [50]. These are the following modification methods: a) Forming organic complexes with clay, where the clay is mixed with compost or residual sludge, which can rise the sorption of metals up to six times more due to the upturn in CEC [55], this is an environmentally friendly method, however the presence of organic matter can affect the immobilization of metals [56]; b) Modification with nano-zero valent iron (nZVI), small particles are used as binders that increase the active adsorption sites on the clay surfaces by impregnation, followed by filtering, washing and drying [48]. This can also be done by chemical synthesis, with H2 or Fe2+, which are reduced at high temperatures [57]; c) Thermal modification that consists of heating the clay to temperatures of 200–1000°C for a time of 3–12 hours, the process dehydrates and dehydroxylates clays. The procedure reduces the mass, increases the porosity and the cation exchange surface but the disadvantage is that the time and temperature must be determined for each type of clay [58]; d) Modification with acids to remove impurities as Ca, Mg K and metal oxides present in the clay, and modify the adsorption surface [59]. Although the method increases the cost of the amendment, and it can release new agents into the environment [60]. However, the application of pristine or modified clays as remediation methods, require more field studies to determine the ecotoxicity and biocompatibility. Since the change in pH, redox potential, temperature and CEC of the soil strongly influences the mobility of metals. In addition, clays are not selective and have partial binding capacities [61].
3.5 Biochar
Biochar as a solid product of biomass pyrolysis has shown to present large specific surfaces for sorption [62] and remotion of heavy metals from mine tailing sites and polluted soils [12].; being a porous material [63], it has been reported to improve soil physical properties [64]; to provide nutrients, allowing the development of microorganisms [62] too, and last but not least, increasing both, pH values which normally range between 5 to 12, depending on the material and the pyrolysis temperature (see Figure 3), and the alkaline neutralization potential (Figure 4).
Figure 3.
Biochar characteristics and properties as affected by temperature of charring. Tendencies and general behavior of relevant parameters usually measured and reported are shown vs. temperature (°C). Data plotted show Specific surface (m2 g−1); Ash contents (%); Pore Volume (cm3 g−1); Yield (%); C-content (%); H-content (%); O-content (%); N-content (%); pH; and C/H; C/O; and C/N ratios. Data compiled from [75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103].
Figure 4.
Graphs show neutralization (pH-% biochar) and kinetic (pH-time in days) curves of an acid mine waste from Zimapan, Hidalgo State, Mexico with biochar of water hyacinth, Eichhornia crassipes Mart, (H) and Eucaliptus, Eucalyptus globulus Labill, (E) whose initial pH was ca. 2.9. Solid:liquid ratio was 1:3, processed in small polyethylene reactor flasks with cap. Ten flasks were prepared to which various dose of liming material was added at variable levels of 0–10% biochar, which were kept incubated for the time period described. pH-values were monitored over time. As an example of curves, some flask-systems results are plotted [14, 15].
3.5.1 Effects on the acidic mine waste remediation
Biochar can be used to modify soil structure, improve physicochemical properties and enhance nutrient intake by plants, modify habitat for microorganisms, adsorb pollutants and mitigate climate change by changing the availability of elements in soils, especially C [62]. Yuan et al., 2019 [62] also propose the use of biochar in alkaline-saline soils, in cultivation areas and industrialized regions. However, more long-term experiments are required to assess the environmental risk, in addition to considering more mechanisms to make progress in biochar production, when modifying biomass type, pyrolysis temperature, gas flow, retention times, all to increase the efficiency of using biochar as an amendment (see Section 4.1). The fissure intensity factor has also been evaluated [64, 65], with positive conclusions towards the reduction of cracks in this respect, because these affect permeability and water retention and balance in soils. Here water hyacinth (Eichhornia crassipes) and soil biochar were studied to know their effect on water content and soil suction in doses of 0 to 10% (w:w) for 3 months. More suction was observed when higher doses of biochar were added, when compared to unamended treatments, finding best doses close to 10% values for most soils, to increase permeability and water retention in soils. Zimmerman, 2010 [66] carried out laboratory experiments to model C-longevity in soils, for controlling pollution migration, increasing fertility and sequestering carbon. The author mixed pyrogenic or “black” carbon-lime-biosolids and biochar-lime-biosolids-inoculum in soils contaminated with mine tailings, the results were that even in the absence of inoculum, microorganisms made progress under the two systems studied. However, both systems generally decreased with increasing charring temperature. Recalcitrant organic carbon content of soil increased in the long run, showing a slow natural mineralization of up to 26% losses in 100 years, projecting half-lives of 102 to 107 years in the environment [66]. Unfortunately, there was found evidence to suggest that its stability was less than previously thought, being that biochar-carbon was considered to be extremely refractory. Biochar lability was found to be strongly controlled by the relative amount of a more aliphatic and volatile component, which later an inferred though came up to suggest that their losses could be utilized as an indicator of biochar C longevity. Final conclusions were made in terms of its practical value for considering biochar as a tool for soil remediation, amelioration, or atmospheric C sequestration. The stability of two biochar materials of rye grass and pine wood has also been evaluated at 350°C under oxic conditions. Markers of lipid extracts [67], and the composition of n-alkanes and n-fatty acids was used as indicators of stability to microorganisms. Pyrolysis breaks down these molecules and reduces them to shorter chains. Lignin seems to “survive” the process, it is also mentioned that the first day’s microorganisms were more predisposed to degrade the biochar of grass than that of wood. Among some of the disadvantages of this amendment it can be found that: it can cause health problems when inhaling the dust [68]; requires high temperatures to be used as a remediation method for liming and adsorbing various metals [69]. The potential risk of using biochar and establishing vegetation creates these and some extra problems, since these may also acidify the soil due to the release of acids that again might solubilize the metals in the biochar, what has called for the attention to make a review of several cases in China where after a while some metals are released. Recent studies indicate that biochar applications could pose ecological and health risks by releasing toxic substances into soils or by inhalation of biochar dust during production or its application on the fields [67]. In China, biochar is commonly used for remediating agricultural soils. Processes for metal interactions with biochar-soil materials may involve adsorption-precipitation and/or complexation reactions, as affected by pH, CEC, organic matter contents, and other modified soil properties. Most field trials showed HM uptake by plants and concentrations of mobility-bioavailability HMs in soil that biochar addition reduced. However, there can also be adverse effects of applying biochar to contaminated soils. Toxic substances contained in biochar may be released to the environment, resulting in increased pollution, and impacting soil organisms and soil functioning, as there are no application standards of regulatory frameworks for biochar application, safety precautions, food safety and human health effects upon exposure, and long-term effects of biochar applications to HM contaminated soils on soil ecosystems. Biochar has been used mixed with mud at 300–900°C, with pyrolysis temperature affecting pH, specific surface, and functional groups, as well as the composition and content of the dissolved organic matter. The higher the temperature, the metal content decreased more (from 91.7% to 9.4% for Cu, 92–63% for Zn, 55.9% to 4.9% for Pb, and 78.2% to 12.5% for Cd, among other metal(loids)). The length of the shoots and roots, and the activity of microbes, in sandy and silty soils, were also increased. In general, biochar prepared at high temperatures was safe for their production or application. High doses of 3–9% (equivalent to more than 60 to 200 Mg ha−1) were estimated to be required to remedy heavy metal contaminated soils [70]. Due to this it has been proposed to mix small amounts of biochar with lime or with compost to increase the pH of acid residues so that other properties in the soil can be improved [12, 71]. Miscanthus biochar (Miscanthus giganteus) was utilized in acid residues with low pH values (pH < 3), applying doses of 0 to 5% (w/w) with and without lime and fertilizers. To evaluate its effect, a bioassay carried out with Blue Wildrye (Elymus glaucus cv. ‘Elkton’), showed that lime mixed with biochar greatly decreased the extractable metal levels. Higher doses of biochar also reduced the extractable concentration of metals and improved the microbial activity [71]. Currently, there are studies too, where biochar has also been modified by the addition of alkalis, oxidants (as O3, H2O2, K2MnO4 and air), microwaves, CO2 and steam, to improve its sorption capacity [72]. Biochar activation methods have been studied [73], utilizing water hyacinth to remove metals from polluted waters, which subsequently was pyrolyzed and applied to the soil with phosphates. According to authors [74] positive and negative effects on biochar activation were observed, depending on the method of activation, kind of bioassay and kind of soil too, however, the increase of biochar specific surface area caused a significant reduction of toxicity of water leachates due probably to the presence dissolved organic carbon in soils.
As noticed, biochar is widely recommended for remediation of heavy metals polluted environments due to its excellent immobilization effect, which may last for many years [67]. There is a general agreement, then, that the increase–decrease of biochar effectiveness with time, depends on the abiotic and biotic factors [56, 66, 67, 68, 69, 70, 71, 72, 73, 74].
3.5.2 Relevant characteristics of biochar as affected by temperature
According to all researchers and papers reviewed and mentioned above, many of the characteristics of biochar vary and depend mainly on temperature of charring, and type of initial material too, among other characteristics and conditions of biochar production. However, most of their important characteristics tend to be congruent with this. Nevertheless, some parameters and analyses reported in literature show good agreement and tendencies with temperature of charring, but some others not as can be seen from the curves plotted from a compiled data collected from references [75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103] (see Figure 3). Among the strategies that have been receiving greater attention, the use of biochar has been outstanding in this respect. The coal produced from the pyrolysis of biomass, compiled data with temperatures ranging from 250 to 750°C [104]. It is known that the material used for the preparation of the biochar, the pyrolysis temperature, the size of the waste to be pyrolyzed, the speed of pyrolysis, among others, influenced the physical, chemical and biological characteristics of the material obtained, such as ash content, specific surface, and pH-values, among others [104]. Biochar materials used in the retention of polar contaminants are obtained at high temperatures, because in this condition the specific surface area and sites for adsorption are increased [105]. Pyrolysis temperatures of 400 to 750°C caused the biochar produced to get values of pH > 7, higher values of ash contents and lower specific surfaces, than those generated at temperatures below 400°C [106]. However, biochar produced with straw, at high temperatures (>500°C), usually present high concentrations of the potentially toxic polycyclic aromatic hydrocarbons (PAHs) due to incomplete combustion. Therefore, it is necessary to carefully define the conditions of pyrolysis, to generate a non-toxic biochar suitable for the intended plants and soil microorganisms [67, 107]. There is information explaining the retention mechanisms that occur when biochar is used for the purpose of sequestrating organic and inorganic pollutants. Metals interact with biochar through electrostatic interactions, by cation exchange, adsorption by proton exchange and specific bindings [67, 108]. It is known that the adsorption of Pb by biochar is attributed to phosphate and carbonate in the aqueous phase of the pores of the material, whereas for Cu, pyrolysis temperature and increased pH, correlate well with metal adsorption. Uchimiya et al., 2012 [109] reported that biochar can adsorb up to 42,000 mg of Cu per kg−1 in aqueous solution at acidic pH values. If the pH value increases, the retention is due to the organic binders on the surface of the material and to the sorption-precipitation with carbonates and oxides which are also found in the pores.
Figure 3 shows that specific surface, pore volume, yield, C-, H-, O-content, pH and C/H, and perhaps C/O ratios show some tendencies as charring-burning temperature of materials increases. It must be mentioned that a variety of materials and burning conditions, besides temperature, vary, however, some very clear tendency behavior can be observed. Most interesting for the purposes of this chapter are the tendencies observed for pH, specific surface, yield and C-content and C/O ratios, as these variables will correspondingly stand for the acid–base account, sites for exchange capacity, and functional groups (represented by C and O-contents) which should favor remotion via sorption of HM present in the mine wastes. The production and application of biochar from plants with high growth rates and weeds, for instance, present areas of opportunity to remediate acid residues generated by mining activities, at the time of contributing to solve some of the unwanted proliferation of these plants on terrestrial and lacustrine, riverine, or irrigation and wastewater channels around urban areas all over the world. Water hyacinth plants present growth rates ranging from of 100 to 208 Mg ha−1 year−1 [110, 111], which besides its high biomass yields, possesses strong adsorption capacities, due to its high cellulose content and carboxyl and hydroxyl functional groups [112]. These properties give to this material an extreme potential for use for remediating activities in metalliferous acidic mining wastes. For this reason, is that it has been used in wetlands, in solid dry form (as biochar), to remove toxic metals from aqueous solutions, wastewater and effluent treatments [113], and soil [114]. Eucalyptus trees on the other hand, also present high growth rates of the order of 25.5–40.2 Mg ha−1 year−1 dry matter equivalent with cutting periods of 7 to 10 years [115]. Although not many studies can be found on this plant, it might easily be considered of special interest in this respect.
4. Biochar as a remediation amendment for acid mining wastes: A case of study
Zimapan mining district in Hidalgo State, Mexico generates mine wastes with high Cu, Pb and Zn contents. Water hyacinth (Eichhornia crassipes) and Eucalyptus (Eucalyptus globulus Labill) trees require attention as they have been proliferating excessively in lacustrine, riverine, irrigation- and wastewater-channels and in streets and parks of cities and urban areas of Mexico, and other parts of the world, creating enormous residues of plant material, branches and wood. Remediation treatments to solve both problems seem to converge into the single strategy presented here. The objectives of the research were: a) to evaluate biochar derived from water hyacinth, E. crassipes Mart (H) and Eucalyptus, E. globulus Labill (E) to treat acidic metalliferous mining wastes; and b) to compare biochar performances vs. lime (L), both alone and in combination with phosphate (F) fertilizers. Combined biochar and lime amendments with phosphates included were (FH), (EH) or with lime (FL), via running a root length growth bioassay using barley plants (Hordeum vulgare L), to correlate them with total, DTPA-extractable and water-soluble metal contents and pH as published in [14]. In this investigation four substrates were used to emulate pollution gradients, ranging from pristine soil to pure acidic mining waste. Treatments were: 100%-neutral pristine soil (M1) from the mine surroundings; 100%-acid mine residues (M4); and two mixtures of soil:residues (w/w) of 65:35 (M2) and 35:65 (M3). Substrates were treated with the amendment gradient doses (w/w) of up to 10% (H) or (E), lime, L (3.4%), and phosphate F (0.06%). Blanks (non-amended mixtures) were included. The study showed that water hyacinth (H) and eucalyptus (E) could be utilized as an acid mine residue treatment by converting them firstly into biochar. Biochar materials were produced from water hyacinth (H), E. crassipes Mart, and eucalyptus (E), E. globulus Labill (branches and leaves) collected from Lake Patzcuaro, Michoacan State, and from Texcoco, State of Mexico, respectively, both in Mexico. Briefly, plants were air dried and milled to pass a 3.5 mm mesh. Both plant materials were slowly pyrolyzed following conditions of temperature of 600°C, speed of 10°C min−1 and resilience time of 30 min, as described in Refs. [14, 15, 108]. The surface morphology of the both uncharred plant- and biochar-materials were examined using a scanning electron microscope and Jeol Scanning Electron Software for elemental analysis [14]. Images shown in Figure 5 were taken with an EDX Oxford Instruments Model INCA-X-ACT probe. Figure 5 includes the images of root- and leaf-cross-section of water hyacinth cut; CaCO3 crystals in water hyacinth leaf; biochar particles of the bulb and root of the water hyacinth less than 2 mm; eucalyptus bark; cross-section of eucalyptus leaf; pyrolytic eucalyptus bark with crystals and eucalyptus biochar particles greater than 2 mm, respectively.
Figure 5.
Images of root (a) and leaf (b) cross-section of water hyacinth cut; CaCO3 crystals in water hyacinth leaf (c); biochar particles of the bulb and root of the water hyacinth less than 2 mm (d); eucalyptus bark (e); cross-section of eucalyptus leaf (f); pyrolytic eucalyptus bark with crystals (g); and eucalyptus biochar particles greater than 2 mm (h). Scan images were taken with a JEOL Model JSM-6390 scanning electron microscope, at the electron microscopy unit (UME) of Postgraduate College, Montecillos-Campus (COLPOS), at Texcoco, Mexico State, Mexico [14].
Alkalinity (ABA) determinations were carried out for biochar and lime treatments as reported by other works [1, 2, 5, 14, 15]. Results produced liming potentials for H and E equivalent to 16.4 g kg−1 (kg ton−1) and 8.02 g kg−1 (kg ton−1) of CaCO3, respectively. The equivalent doses necessary to correct the acidity of the mine residues to bring them to pH 6.5 were 5% for H, and 9% for E as shown in the neutralization curves of biochar depicted in Figure 4. Lime dose to correct the acidity of M4 to reach pH of 6.5, was 9.2 mmol(OH-) for 10 g of M4, equivalent to 34 kg of Ca(OH)2 ton−1 of the residues, amount that was found to be in the order of magnitude of other author’s quantifications [5]. Worth to mention is that the pH stabilization time for lime was 34 days, a longer time in comparison to that required when biochar was used as a neutralizing agent. Extra details on the experiment and results can be found in Ref. [14, 15]. Figure 4 shows the neutralization (titration) curves and kinetics of the acid mine waste for both studied biochar materials, as well as with lime. From curves it results clear that neutralization reactions under ideal (laboratory conditions) take several months to stabilize, which consequently will project to take even years for these materials to complete the neutralization reactions, depending of course on particle size (specific surface for reaction) and water content of substrate materials in the field, among others. We have discussed in the introduction section, some of the ABA method details to determine the balance between the acidity potential of the mine tailing material and the neutralization potential of bases naturally present in the soil. An extended discussion of the detail characterization of the acidity of mine materials, including the use of COD-determination and kinetics should be considered if a successful strategy to avoid the so-called acid mine drainage must be stopped. Calculations for neutralizing the mine waste with lime, were included in Section 2.1, and herein we present those of biochar as a liming material (see [14, 15]).
4.1 Biological tests
Biological methods to run biotoxicity assays have been widely used to test the ecological risk assessment of soils [41] and other ameliorated polluted substrate materials (wastes, biosolids, sludge, composts, etc.) [116, 117, 118, 119, 120, 121]. These include measuring the inhibition of root growth [41, 42, 116, 118, 119, 120, 121]; the effects of chemicals on emergence and growth of higher plants [117, 119]; root length responses, germination viability; green house and field tests [122], using metal sensitive higher plants [41, 116, 117, 118, 119, 120, 121] or mesofauna [123, 124] or on the emergence and growth of higher plants when evaluating the effects of pollutants on soil flora [117, 119]. However, it must be stated clearly, what the authors declare about the application and scope of these biological methods. As stated by the authors in many of the presented references, these bioassays are applicable to the comparison of soils of known and unknown quality and to the measurement of effects of materials (compost, sludge, waste) or chemicals deliberately added to the soil [41], and that as stated in references [116, 117, 118, 119, 120], that methods are not intended to be used as a measure of the ability of the soil [and other soil materials, wastes, biosolids, etc. to support sustained plant growth. Nevertheless, the importance and relevance of testing remediated environments should always rely on the fact that recovering native or reforesting vegetation, should be one, and not the unique target of the final goals of remediation strategies, to remediate sites and recover plant growth. Having said that, we present herein some of the more relevant results of the bioassays carried out with the neutralized and amended acidic mine tailings with water hyacinth (H) and Eucalyptus (E) biochar materials as compared with lime (L), alone or mixed with mono-potassium phosphate (F). The biological test was applied according to the described methods in Ref.s [41, 42, 116, 117, 118, 119, 120, 121]. The experiment and results are presented in Section 4.4.
4.2 Physicochemical characterization of soil and biochar materials
For the application of the bioassay, barley seeds (Hordeum vulgare L. var. Hope) were used and the applied procedure was carried out according to the methodology described by ISO-references [116, 117]. Physicochemical characterization values for pristine soil, mining waste and mixtures [M1 is 100% soil; M2 is 35:65% (M1:M4); M3 is 65:35% (M1:M4); and M4 is 100% acidic mining residue], and biochar materials (H) and (E) are shown in Table 1. Determined parameters included pH, Electrical Conductivity (EC), Saturation Percentage (SP), Cation Exchange Capacity (CEC), total-metal levels for CuT, PbT and ZnT, and water soluble-Cu, Pb and Zn. Determinations were carried out according to procedures followed in reference [15].
pH
EC
SP
CEC
BS
CuT
PbT
ZnT
Cu-soluble
Pb-soluble
Zn-soluble
(mg kg−1)
Mixture substrates
M1
6.8 ± 0.2
334 ± 25
62 ± 0.1
27 ± 3
39 ± 1
76 ± 11
173 ± 3
379 ± 11
<DL
39 ± 5
<DL
M2
6.6 ± 0.2
415 ± 21
50 ± 0.4
46 ± 1
50 ± 1
210 ± 20
2384 ± 3
1090 ± 18
0.3 ± 0.04
64 ± 2
<DL
M3
4.7 ± 0.1
468 ± 70
38 ± 0.2
24 ± 6
21 ± 1
324 ± 29
4279 ± 3
1699 ± 24
1 ± 0.04
29 ± 2
5 ± 0.002
M4
3.3 ± 0.1
481 ± 43
35 ± 0.2
22 ± 5
18 ± 1
457 ± 38
6490 ± 3
2409 ± 31
11 ± 0.03
48 ± 6
29 ± 2
Biochar
H
10.2 ± 0.1
604 ± 32
346 ± 7.0
42 ± 2
424 ± 3
199 ± 33
<DL
115 ± 20
1.2 ± 0.04
< DL
< DL
E
9.9 ± 0.1
277 ± 20
222 ± 0.1
16 ± 1
17 ± 1
213 ± 20
<DL
192 ± 9
1.5 ± 0.04
< DL
4 ± 2
Table 1.
Physicochemical characterization values and standard deviations of chemical properties determined on pristine soil (M1), mixture substrates (M2) and (M3), mine waste (M4) and biochar materials from water hyacinth (H) and eucalyptus (E). Parameters included are pH, Electrical Conductivity (EC) in dS m−1, Saturation Percentage (%SP), Cation Exchange Capacity (CEC) mmolsC kg−1, Base saturation, BS [mmolsC kg−1], total-metal levels for CuT, PbT and ZnT (mg kg−1) and water soluble-Cu, Pb and Zn (mg kg−1). Determinations were carried out according to [15].
Metal Detection Limit (DL): CuT = 10 mg kg−1; PbT = 5 mg kg−1; ZnT = 8 mg kg−1; and water-soluble Pb = 1 mg kg−1; Zn = 0.1 mg kg−1 and Cu = 0.1 mg kg−1. Where: EC1:20 is the Electrical Conductivity (1:20 ratio, μS cm−1); SP (%); Saturation Percentage; CEC is the Cation Exchange Capacity (mmolc kg−1); BS is the Base Saturation mmolc kg−1; CuT, PbT and ZnT are the total metal levels.
Texture of the control soil (M1) was clayey, and its pH (=6.8) is considered neutral, while the M4 sieved at 2 mm presented an acidic pH of 3.3 (see Table 1). The mixtures of soil with the acidic mining residue (M4) raised the pH of both M2 and M3 substrates in greater proportion than in M4. The concentration of water soluble-Zn and -Pb in M2 and M3 samples were lower than the phytotoxic value reported by other authors [125, 126]. The pH value of each substrate decreased as the mine residue increased correspondingly. EC-values, the soluble Cu content, the extracted bases and the CEC increased from M2 to M4 (see Table 1), due to the dissolution of the carbonates present in the pristine soil [3] as promoted by the acidity of the mining residue. The pH values of the (H) and (E) biochar materials used in this study were, on an average, about 10 (Table 1), like those found by other authors [127, 128, 129, 130, 131] who reported that pH of biochar materials reached high alkaline values due to the pyrolysis temperatures used (> 500°C), contents greater than 2% of alkaline elements (Ca, Mg, K and Na), and losses of the functional groups of the source material (carboxyl, phenolics, lactone, etc.). Both the pH and neutralization potential values found in this study (equivalent to 16.4 and 8.02 g CaCO3 kg−1 of biochar materials H and E, respectively), are directly related to the contents of exchangeable bases. These values are comparable too with those reported by other works [127]. The EC of the biochar were 0.3 and 0.6 dS m−1, for E and H respectively. These results are similar to those obtained in wood and paper biochar produced at a temperature of 550 and 700°C [129], whose values ranged between 0.09 to 0.44 dS m−1 (ratio of 1:5 s:v). Other researchers [106, 132] have reported that some properties of biochar differ according to the pyrolysis method employed, and temperature, the source material, the amount applied and the climatic conditions, so that the variability in these conditions makes the results not entirely comparable and conclusive. The different and contrasting values of pH, neutralization potential, number of bases, EC, etc., might also vary depending on the analytical methods used, as well as the way in which these are processed, as demonstrated by Singh et al., 2010 [129]. Table 1 also show the CEC-values measured by silver thiourea method (AgTU) [15], without removal of carbonates and soluble salts, which for E was 16.1 mmol(−) kg−1, while for H it was 41.3 mmol(−) kg−1. These authors [129] also recommend measuring CEC and base saturation, with the above method, but with prior removal of salts, since these can increase the pH of the extracting solution (pH > 8) promoting the precipitation of Ag with sulfides, which occurs at basic pH-values, leading to a possible overestimation of both parameters. The authors also determined CEC of an eucalyptus biochar, measured with AgTU without removal of carbonates and soluble salts and obtained values of 91 mmol(−) kg−1, however, when these carbonates and salts were removed, the CEC decreased by 60% (to 36.4 mmol(−) kg−1). According to them, the actual CEC, if the effect of salts on the biochar of the study were eliminated, it would lead to CEC-values of 9.7 mmol(−) kg−1 for E and 24.8 mmol(−) kg−1 for H biochar.
4.3 Results of the root length bioassay
Figure 6 shows the results of the root length bioassay only for Cu, carried out with barley plants under the conditions mentioned at the start of the section. For more details of the experiments for other metals (like Pb and Zn) refer to [15]. Results show the effect of treatments on barley root length (Hordeum vulgare L. var. Hope), pH and soluble copper in the soil-acid mining residue gradient. The lowercase letters on each bar indicate statistical differences (Fisher’s test, P < 0.01). Where the first letter and subscript indicate the mixture type [M1 is 100% soil; M2 is 35:65% (M1:M4); M3 is 65:35% (M1:M4); and M4 is 100% acidic mining residue] and the last letter(s) indicates the treatment. To be able to define a critical reference level (P < 0.01) of root growth length and using it as an indicator of phytotoxicity and efficacy of treatments, the average value of the root length of the pristine soil (M1) was used. This was the minimum mitigation value to be achieved. The M4 and M4F treatments had a growth below the critical level of the reference value (Figure 6), mainly due to the low pH of these substrates (3.2 and 3.7, respectively), that is, due to the phytotoxicity caused by the high chemical activities of the H+ ions. The high activity of H+ ions, caused by the hydrolytic oxidation of minerals such as pyrite (FeS2), causes the release of free sulfuric acid [133]. In contrast, the response of the remaining treatments was equal to or greater than that of M1, due, on the one hand, to the increase in pH, which favors the decrease of the chemical activity of H+ ions and the phytotoxicity caused by the sorption of metals onto the solid phase [134]. In M1 the response was: M1F > M1E > M1H = M1 = M1FE = M1FH, where treatments with F and E were the ones with the greatest response. The rest of the treatments showed no significant differences. The effect of F treatment, in combination with biochar, was not significant with respect to M1. Karami et al. [135] showed that wood-derived biochar applied at doses of 20% (v:v), reduced phosphorus availability. In our case the bioassay showed this type of antagonism when phosphates were applied with H and E in M1. For the M2 substrate (pH = 6.6, 65% soil and 35% acid residue), the control treatment, i.e., the mixture without any additional treatment, promoted the highest root growth. The order of response was: M2 > M2L = M2F = M2FL = M2E = M2H > M1 = M2FH = M2FE. It is evident that the presence of M1 soil in 2/3 parts of the substrate was sufficient to mitigate the phytotoxic effect of 1/3 of the acid residue. The addition of L, F, FL, E and H generated less root growth each time, respectively, with respect to the blank treatment. Treatment pH-values of those with neutralizing potential (L, H and E and mixtures of these with F) were greater than 7, while for phosphates pH was 5.9, having, as expected, no effect on pH. However, FH and FE treatments in this system decreased the response even more than the combination of lime-phosphate (FL) and that of lime (L). For the M3 (1/3 of M1 and 2/3 M4) the response order to the application of E and L, was: M3FE = M3L = M3E = M3F = M3 = M3H = M3FL > M3FH > M1. All these treatments showed better responses than the reference level shown by the pristine soil (M1). According to Figure 6, soluble-Cu was not detected in the pristine soil, but for the treatments of the same substrate (M3), this metal contributed evidently to the positive response. The pH values of the treatments ranged from 4.7 (M3) to 7.7 in M3L and M3FL. The correlation between the pH and the concentration of the soluble metal, and that between the soluble metal and the root length are related to the increased extractability of the soluble metal at low pH values (<4), while reducing root growth. The inferred relationship is indicative of the level of the phytoavailability of Cu, more than to the reduced phytotoxicity in the treatment. The increase in root length in the M2 and M3 substrates, compared to the reference materials (M1 and M4), was as expected, because soils naturally tend to reduce the mobility and mitigate the phytotoxicity of metals such as Pb, Zn and Cu, especially when metals are in high concentrations [134]. This seems to occur because there are sites where metals can be adsorbed and complexed with free organic and inorganic functional groups. However, the process can be accelerated if some amendments are used to agrostabilize the environment, such as phosphoric fertilizers, composts, biochar or biosolids, and/or liming materials, among others [136]. Also, the positive effect on root growth in M2 and M3 compared to M1 treatment is satisfactorily explained by the fertility contribution of phosphate (and potassium) from the F treatments and the micronutrients Cu and Zn coming from the mining residue. The addition to M4 to H, FL, E, FH and FE treatments enlarged the length of roots with respect to the blank. The order: M4H = M4FL = M4E = M4FH = M4FE > M1 = M4L> > M4F = M4. Treatment response in this case showed equal or greater response in growth than M1, fact that can be explained by the pH increase caused by the basic materials added, and the increased phytoavailability of Cu, as compared with the other substrates.
Figure 6.
Effect of treatments on barley root length (Hordeum vulgare L. var. Hope), pH and soluble copper in the soil gradient substrates-acid mining residue. The lowercase letters on each bar indicate statistical differences (Fisher’s test, P < 0.01). Where the first letter and subscript indicate the mixture [M1 is 100% soil; M2 is 35:65% (M1:M4); M3 is 65:35% (M1:M4); and M4 is 100% acidic mining residue] and the last letter(s) indicates the treatment where F corresponds to phosphates, L to liming), H and E to biochar of water hyacinth and eucalyptus, respectively.
5. Conclusions
The chapter presents in its introduction, a general view of the sound methodology that is proposed through the rest of the sections, to both, remediate acidic metal polluted mine wastes, taking advantage of the neutralizing alkalinity and high metal sorption affinity of pyrolyzed materials, and to utilize biochar derived from high-rate growth plants (water hyacinth, and eucalyptus, which have become of ecological relevance due to their unwanted proliferation over specific terrestrial, lacustrine or riverine environments. Relevant calculations are presented in the section two to analyze the discrepancies reported in literature among ABA methods, COD-redox measurements and kinetic factors, that may affect the determination of the right doses to neutralize with lime or pyrolyzed materials of alkaline reaction, the acidity of metalliferous mining wastes. In this section too, the status of the heavy metal problematic provoked by the sulfidic mine tailings deposits on dams is also considered, that in terms of dimensioning the relevant physicochemical characteristics to overcome when a remediation strategy is planned or put on action, when trying to mitigate and abate the toxic effects of HM on the biota. The section also addresses the importance of not only neutralizing the mine tailings but abating the toxic levels of heavy metals (HM) like Pb, Cd, Cu, and Zn, to fulfill the international and national standards and norms. Section three includes a review of the main amendment materials used, alone or in combination with biochar, to remediate heavy metal polluted sites. These references reviewed include lime, phosphates, compost, biosolids, clays and more precisely the role of biochar on these reclamation activities. A comprehensive compilation of characteristics of biochar as affected by temperature, is presented in Figure 3. Data plotted against charring temperature show behavior of specific surface; ash contents, pore volume, yield, C-, H-, O- and N-contents, pH; and C/H, C/O and C/N ratios. In Section 4 a case of study is presented to congruently exhibit how the strategy proposed was tested through following the methodology described herein. An experiment where biochar was combined with phosphate, and compared against the performance of lime, alone and combined with phosphate too, is exposed. Results of the root length bioassay only for Cu, carried out with barley plants under the conditions mentioned at the start of the section. For more details of the experiments for other metals (like Pb and Zn) refer to [15]. Results of the effect of soil-acid mining residue gradient were tested applying a bioassay on barley (H. vulgare L. var. Hope) plants and correlated with pH and soluble copper levels.
\n',keywords:"biochar, mine tailings remediation, soil amendments, heavy metal phytotoxicity, heavy metal availability and speciation",chapterPDFUrl:"https://cdn.intechopen.com/pdfs/78923.pdf",chapterXML:"https://mts.intechopen.com/source/xml/78923.xml",downloadPdfUrl:"/chapter/pdf-download/78923",previewPdfUrl:"/chapter/pdf-preview/78923",totalDownloads:112,totalViews:0,totalCrossrefCites:0,totalDimensionsCites:0,totalAltmetricsMentions:0,impactScore:0,impactScorePercentile:44,impactScoreQuartile:2,hasAltmetrics:0,dateSubmitted:"September 5th 2021",dateReviewed:"September 8th 2021",datePrePublished:"October 9th 2021",datePublished:"April 13th 2022",dateFinished:"October 9th 2021",readingETA:"0",abstract:"The chapter is meant to expose how a sound methodology can be instrumented to both, remediate acidic metal polluted mine wastes, taking advantage of the neutralizing power and high metal sorption affinity of biochar, and to utilize pyrolyzed material derived from high-rate growth plants (water hyacinth, Eichhornia crassipes Mart, and Eucalyptus, Eucalyptus globulus Labill), which have become of ecological relevance due to their unwanted proliferation over specific terrestrial, lacustrine or riverine environments. In addition, the proposal considers not only neutralizing the mine tailings and abating the toxic levels of specific heavy metals like Pb, Cd, Cu, Zn, etc., to fulfill the international and national standards and norms, but to conveniently combine biochar with widely used soil amendments to pass widely recognized biological tests of growth using heavy metal-sensitive plants. The approach addresses firstly: a) characterizing physiochemically mine tailings and biochar, in terms of their properties (metal speciation and contents, potential acidity and neutralization potential, chemical oxygen demand, heavy metal-biochar sorption-complexing affinities, among others), and secondly; b) creating a” fertile environment” by reconditioning, agriculturally, the heavy metal-polluted acidic mine waste to allow native vegetation, or other reforesting species, to regrow on the reclaimed site, based on the bioassay tests performances.",reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/78923",risUrl:"/chapter/ris/78923",book:{id:"10862",slug:"recent-perspectives-in-pyrolysis-research"},signatures:"Arturo Aguirre Gómez, Laura Virginia Nuñez Balderas, Claudia Hidalgo Moreno and Jorge Dionisio Etchevers Barra",authors:[{id:"107923",title:"Dr.",name:"Claudia",middleName:null,surname:"Hidalgo Moreno",fullName:"Claudia Hidalgo Moreno",slug:"claudia-hidalgo-moreno",email:"hidalgo@colpos.mx",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",institution:{name:"Colegio de Postgraduados",institutionURL:null,country:{name:"Mexico"}}},{id:"420007",title:"Prof.",name:"Arturo",middleName:null,surname:"Aguirre Gómez",fullName:"Arturo Aguirre Gómez",slug:"arturo-aguirre-gomez",email:"aag@unam.mx",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",institution:{name:"National Autonomous University of Mexico",institutionURL:null,country:{name:"Mexico"}}},{id:"429698",title:"MSc.",name:"Laura Virginia",middleName:null,surname:"Nuñez-Balderas",fullName:"Laura Virginia Nuñez-Balderas",slug:"laura-virginia-nunez-balderas",email:"lauravirginianunez5@gmail.com",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",institution:{name:"National Autonomous University of Mexico",institutionURL:null,country:{name:"Mexico"}}},{id:"436329",title:"Dr.",name:"Jorge Dionisio",middleName:null,surname:"Etchevers Barra",fullName:"Jorge Dionisio Etchevers Barra",slug:"jorge-dionisio-etchevers-barra",email:"jetchev@colpos.mx",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",institution:null}],sections:[{id:"sec_1",title:"1. Introduction",level:"1"},{id:"sec_2",title:"2. Mine waste and metalliferous acid mine drainage",level:"1"},{id:"sec_2_2",title:"2.1 Chemical characterization of mine wastes for remediation",level:"2"},{id:"sec_3_2",title:"2.2 Toxic heavy metals in mine tailings",level:"2"},{id:"sec_5",title:"3. Agrostabilization of mine waste and polluted soils",level:"1"},{id:"sec_5_2",title:"3.1 Lime",level:"2"},{id:"sec_6_2",title:"3.2 Phosphate fertilizers",level:"2"},{id:"sec_7_2",title:"3.3 Compost and biosolids",level:"2"},{id:"sec_8_2",title:"3.4 Clays",level:"2"},{id:"sec_9_2",title:"3.5 Biochar",level:"2"},{id:"sec_9_3",title:"3.5.1 Effects on the acidic mine waste remediation",level:"3"},{id:"sec_10_3",title:"3.5.2 Relevant characteristics of biochar as affected by temperature",level:"3"},{id:"sec_13",title:"4. 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Qual. 2012;41:990-1000'},{id:"B106",body:'Novak JM, LimaI, King B, Gaskin JK, Steiner C, Das KC, Ahmedna M, Rehrah D, Watts DW, Busshner WJ, Schumber H. Characterization of design biochar produced at different temperatures and their effects on a loamy sand. Ann. Env. Sci. 2009;3:195-206'},{id:"B107",body:'IBI. Standardized Product Definition and Product Testing Guidelines for Biochar That Is Used in Soil. International Biochar Initiative, United States; 2014'},{id:"B108",body:'Tang, J., W. Zhu, R. Kookana, and A. Katayama. Characteristics of biochar and its application in remediation of contaminated soil. J. Biosci. Bioeng. 2013;6:653-655'},{id:"B109",body:'Uchimiya M, Cantrell KB, Hunt PG, Novak JM, Chang S. Retention of heavy metals in a Typic Kandiudult amended with different manure-based biochars. J. Environ. Qual. 2012;41:1138-1149'},{id:"B110",body:'Masto RE, Kumar S, Rout TK, Sarkar P, George J, Ram LC. 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Geneve, Switzerland, 2012'},{id:"B119",body:'ISO 11269-2: Soil quality: Determination of the effects of pollutants on soil flora - Part 2: Effects of contaminated soil on the emergence and early growth of higher plants. International Organization for Standardization. Geneve, Switzerland, 2012'},{id:"B120",body:'OECD Guidelines for the testing of Chemicals 208: Terrestrial Plant Test: Seedling Emergence and Seedling Growth Test. 2006'},{id:"B121",body:'Ginocchio R. Rodríguez P. Validation of the terrestrial biotic ligand model: Prediction of copper toxicity to barley in soils of north-central Chile. Centro de Investigación Minera y Metalúrgica. Chile. 2007'},{id:"B122",body:'Nasona P, Johnson RH, Neuschützc C, Alakangasa L, Öhlander B. Alternative waste residue materials for passive in situ prevention of sulfide-mine tailings oxidation: A field evaluation. J. Hazar. Mat. 2014;267:245-254'},{id:"B123",body:'ISO 11268-1 Soil quality–Effects of pollutants on earthworms - Part 1: Determination of acute toxicity to E. fetida/. International Organization for Standardization. Geneve, Switzerland, 2012'},{id:"B124",body:'ISO 11268-2 Soil quality - Effects of pollutants on earthworms - Part 2: Determination of effects on reproduction to E. fetida/Eisenia Andrei. International Organization for Standardization. Geneve, Switzerland, 2012'},{id:"B125",body:'Macnicol RD, Beckett PHT. Critical tissue concentrations of potentially toxic elements. Plant Soil. 1985:85:107-129'},{id:"B126",body:'Kabata-Pendias, A. and H. Pendias.. Trace elements in soils and plants, third ed. CRC Press, Boca Raton, USA, 2001; 403 pp'},{id:"B127",body:'Berek AK, Hue NV. Characterization of biochars and their use as an amendment to acid soils. Soil Sci. 2016;181:412-426'},{id:"B128",body:'Tan C, Yaxin Z, Hongtao W, Wenjing L, Zeyu Z, Yuancheng Z, Lulu r. Influence of pyrolysis temperature on characteristics and heavy metal adsorptive performance of biochar derived from municipal sewage sludge. Bioresour. Technol. 2014:164:47-54'},{id:"B129",body:'Singh, B, Singh BP, Cowie AL. Characterization and evaluation of biochar for their application as a soil amendment. Aust. J. Soil Res. 2010:48:516-525'},{id:"B130",body:'Gaskin JW, Steiner C, Harris K, Das KC, Bidens B. Effect of low temperature pyrolysis conditions on biochar for agriculture use. Trans. ASAE. 2008;51:2061-2069'},{id:"B131",body:'Chun Y, Sheng G, Chiou CT, Xing B. Compositions and sorptive properties of crop residue-derived chars. Environ. Sci. Tech. 2004;38:4649-4655'},{id:"B132",body:'Scott HL, Ponsonby D, Atkinson CJ. Biochar: an improve of nutrient and soil water availability-what is the evidence? CAB-Reviews. 2014;9:1-19'},{id:"B133",body:'Tordoff GM, Baker AJM, Willis AJ. Current aproaches to the revegetation and reclamation of metalliferous mine wastes. Chemosphere 2000;41:219-228'},{id:"B134",body:'Jiang J, Xu R, Jiang T, Li Z. Immobilization of Cu (II), Pb (II) and Cd(II) by the addition of rice straw derived biochar to a simulated pollution Ultisol.. J. Hazard. Mater. 2012;229-230:145-150'},{id:"B135",body:'Karami N, Clemente R, Moreno-Jiménez E, Lepp NW, Beesley L. Efficiency of green waste compost and biochar soil amendments for reducing lead and copper mobility and uptake to ryegrass. J. Hazard. Mater. 2011;191:41-48'},{id:"B136",body:'Adriano DC, Wenzel WW, van Gronsveld J, Bolan N. Role of assisted natural remediation in environmental cleanup. Geoderma 2004;122:121-142'}],footnotes:[],contributors:[{corresp:"yes",contributorFullName:"Arturo Aguirre Gómez",address:"aag@unam.mx",affiliation:'
Faculty of Superior Studies, Department of Chemistry, National Autonomous University of Mexico, Mexico
'},{corresp:null,contributorFullName:"Laura Virginia Nuñez Balderas",address:null,affiliation:'
Faculty of Superior Studies, Department of Agricultural Sciences, National Autonomous University of Mexico, Mexico
Laboratory of Soil Fertility at Campus Montecillo, Ministry of Agriculture, Postgraduate College, Mexico
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1. Introduction
If organs with high regenerative capacity undergo chronic injury and inflammation, their healing often occurs abnormally - due to replacement of the damaged elements with connective tissue. The most striking example of such distorted regeneration is the development of liver fibrosis and cirrhosis on the background of its chronic damage. Fibrosis is an “exceeding” healing accompanied with the formation of an excessive amount of connective tissue incorporated into liver parenchyma due to extracellular matrix (ECM) overproduction and/or its incomplete degradation.
The main etiological factors of liver fibrosis and cirrhosis are alcohol, storage diseases, hepatitis viruses, hepatotoxic drugs, cholestasis, and autoimmune reactions. The trigger of fibrogenesis is chronic injury accompanied by an inflammatory component, which causes the activation and expansion of mesenchymal cells (including fibroblasts, myofibroblasts, smooth muscle cells) and increased synthesis of ECM molecules, predominantly collagen. Cells involved into the inflammation actively produce soluble factors like pro-inflammatory cytokines, endothelins, growth factors, reactive oxygen and nitrogen species, which also promote fibrogenesis [1, 2]. The final stage of organ’s fibrosis is cirrhosis - the irreversible replacement of a significant part of that by connective tissue, which leads to the organ’s failure. The main cells which “trigger” liver fibrosis are hepatic stellate cells (HSC). Under liver injury and if being stimulated with cytokines produced by inflammatory cells, Kupffer cells and hepatocytes, HSCs are activated and transformed into myofibroblasts. The latters are able to migrate to the damaged area and produce a reduced number of matrix metalloproteinases (MMPs) and an increased number of their tissue inhibitors (TIMPs) and ECM proteins, causing the growth of connective tissue in liver and accumulation of fibrillar matrix into Disse spaces. Thick bundles of newly synthesized collagen fibers in the Disse spaces between hepatocytes are surrounded by fibroblasts, macrophages, HSCs, lymphocytes, polymorphonuclear leukocytes, eosinophils and plasmatic cells. These cells produce ROS, inflammatory mediators and growth factors, thus maintaining liver inflammation and promoting substantial disorders followed by cirrhosis development [3].
Cirrhosis is the endpoint of many liver diseases and causes the development of serious complications with possible fatal outcome. Those include: liver failure, gastrointestinal bleeding, portal hypertension, i.e. increased pressure in the portal vein, and hepatic coma. Thus, mortality from liver cirrhosis within 1 year after diagnosis varies from 1 to 57%, depending on the stage [4] and reaches more than 1.2 million deaths annually [5].
2. The role of growth factors and their receptors in fibrogenesis
Growth factor receptors are tightly involved in the pathogenesis of chronic inflammation due to their signaling close relationship with the major proinflammatory pathways. Those include, in particular, nuclear factor kappa B (NFκB), p38 mitogen-activated protein kinase (MAPK), phosphatidylinositol 3-kinase/Protein kinase B (PI3K/Akt), Janus kinase/signal transducer and activator of transcription (Jak/STAT) signaling pathways, which are activated not only by proinflammatory cytokines, but also by individual growth factors, such as transforming growth factor beta (TGFβ), TGFα, hepatocytes growth factor (HGF), epidermal growth factor (EGF), insulin-like growth factor (IGF) [6, 7, 8, 9], associated with the “start” of regenerative processes.
The main proinflammatory pathways are also profibrogenic ones. Thus, NF-κB signaling provides not only survival and inflammatory reaction of Kupffer cells, but also survival, inflammatory response and activation of HSCs. Constitutive activity of this pathway in HSCs and/or hepatic myofibroblasts stimulates fibrous degeneration of the liver due to direct profibrogenic and antiapoptotic effects and by stimulating the secretion of cytokines - macrophage attractants [10]. Another proinflammatory pathway, STAT3, is involved in the control of MMPs and TIMPs transcription, TGF-β1 and ECM molecules synthesis and secretion, myofibroblasts proliferation and resistance to apoptosis, thus enhancing tissue regeneration. Activation of this pathway is observed in many tissues due to their fibrosis [11]. The PI3K/Akt pathway, in addition to its significant role in apoptosis inhibition and cell proliferation and survival, may promote epithelial-mesenchymal transition, thus contributing to fibrogenesis [12] (Figure 1). Furthermore, this pathway could be activated by EGF receptor (EGFR), the ligands of which are ones of the main profibrogenic growth factors [13]. P38 MAPK pathway is the one, the effects of the main profibrogenic cytokine TGF-β1 are realized through [14].
Figure 1.
The role of growth factor receptors in liver fibrogenesis.
Macrophages and neutrophils, the first responders on damage and inducers of acute inflammation, also produce cytokines and chemokines, which serve as mitogens and chemoattractants for endothelial, epithelial and mesenchymal cells (myofibroblasts, HSCs) migrating to the cites of injury. With the chronicity of the inflammatory process, these cells are activated and secrete profibrogenic cytokines and growth factors such as TGF-β1, interleukin 13 (IL-13) and platelet-derived growth factor (PDGF), which further activate macrophages and fibroblasts and promote proliferation of those in addition to epithelial cells. Wound/injury healing also includes ECM synthesis and remodeling. Under chronic inflammation, this process is violated: the synthesis of ECM molecules prevails on their cleavage, leading to accumulation of those, which called fibrosis [15].
Impaired activity of protein kinases, in particular growth factor receptors such as EGFR, vaso-endothelial growth factor receptor (VEGFR), PDGF receptor (PDGFR), fibroblast growth factor receptor (FGFR), play a significant role in development of numerous non-malignant liver diseases, including diseases associated with its fibrous degeneration [16]. Thus, PDGF is the most important cytokine responsible for the proliferation of HSCs; PDGF, VEGF and FGF2 induce their migration, TGF-β causes HSCs transformation to myofibroblasts, stimulates synthesis of ECM by those and inhibits its degradation. Inhibition of these growth factors receptors downregulates mentioned processes [17]. Furthermore, an excessive proliferation of cholangiocytes which express numerous cytokines, chemokines and growth factors is one of the main mechanisms of fibrogenesis. The proliferating cholangiocytes also involve myofibroblasts, fibroblasts and immune cells in this process [18, 19]. Therefore, activation of biliary proliferation (called ductular reaction) contributes a lot in the initiation and progression of liver fibrosis.
3. Growth factor receptors as the targets of antifibrotic therapy
There is no specific remedy for the liver fibrosis to date. Some compounds having therapeutic activity against liver fibrosis are undergoing preclinical and I-II phases of clinical trials. They include: (1) the monoclonal antibodies and low molecule inhibitors of key signaling pathways involved in the regulation of inflammation, HSCs life cycle and collagen metabolism [20]; (2) the broad-spectrum agents exhibiting antioxidant, anti-inflammatory, hepatoprotective, antilipotoxic activities such as ursolic, ursodeoxycholic and 24-norursodeoxycholic acids, resveratrol, silymarin [3]. However, the last agents are rather supplements, the positive effect of which is observed only in combination with other therapeutics.
Cytostatics like methotrexate and azathioprine are actively used for the treatment of diseases accompanied by fibrosis. However, due to the nonspecificity of action, they cause the development of numerous side effects. Therefore, the idea of using selective inhibitors of excessive cell proliferation can be fruitful. Impaired activity of tyrosine kinases, in particular growth factor receptors EGFR, VEGFR, PDGFR, TGFβR, and FGFR, contributes significantly to liver diseases associated with its fibrous degeneration [16]. Therefore, these receptors may be potential targets for antifibrotic therapy [21]. Among approved and experimental therapeutics tyrosine kinase inhibitors (TKIs) possess the leading position.
3.1 VEGFR
VEGF is a key regulator of liver cells proliferation. An increased expression of this growth factor and its receptors by the biliary cells was noted under liver biliary pathologies, in particular polycystic liver disease and primary biliary cirrhosis (PBC) [22]. PBC patients also demonstrated over-expression of the angiogenic factors Ang-1, Ang-2 and tyrosine kinase with immunoglobulin-like and EGF-like domains 2 (TIE2) their effects are realized by, in the epitheliocytes and periportal hepatocytes [23], suggesting, therefore, their contribution in fibrosis development. VEGF has been shown to stimulate also proliferation of sinusoidal endothelial cells and activated HSCs in vitro, indicating that VEGF-VEGFR interaction in HSCs plays an important role in liver fibrogenesis [24]. VEGFR inhibitor sunitinib significantly reduced the inflammatory infiltrate and collagen expression under liver cirrhosis [25]. Another small molecule tyrosine kinase inhibitor vatalanib, which is effective against all VEGF receptors, inhibited CCl4-induced mice liver fibrosis, as evidenced by decrease of fibrous tissue accumulation and hepatic sinusoidal capillarization, and downregulation of α-smooth muscle actin (α-SMA), collagen I and TGF-β1 expression as well [26] (Table 1). Similar results were demonstrated for pan-VEGFR tyrosine kinase inhibitor PTK787/ZK222584 [27].
Drug
Target(s)
Cellular effects
Model/Patients
References
Panitumumab
EGFR
Inhibition of bile duct mucosa excessive proliferation and accumulation of collagen fibers
Depression of HSCs activation, proliferation, migration, α-SMA formation, induce of HSCs apoptosis, reduce collagen deposition in activated HSCs and in liver tissues
TKIs which demonstrated antifibrotic effects, their molecular targets and cellular effects.
3.2 EGFR
The EGFR signaling plays an important role in proliferation of liver progenitor cells and their differentiation into hepatocytes or cholangiocytes during the hepatic regeneration. In liver samples of primary sclerosing cholangitic (PSC) patients, the upregulation of EGFR compared to that of healthy individuals was revealed. EGFR is also required for the induction of active pro-inflammatory response by the cholangiocytes [28]. Indeed, the panitumumab, anti-EGFR antibody, inhibited an excessive proliferation of the bile duct mucosa and accumulation of collagen fibers in chronic proliferative cholangitis [29]. In addition, anti-EGFR antibodies applied at bile duct ligation (BDL) model inhibited biliary epithelium hyperplasia and fibrosis. EGFR inhibitor erlotinib inhibited proliferation of the cholangiocytes and hepatocytes, and prevented activation of HSCs, which was demonstrated on different (CCl4-, diethylnitrosamine (DEN)- and BDL-induced) rat models [30]. EGFR inhibition also significantly reduced viability and ECM production in activated HSCs, inhibited their proliferation and α-SMA production, but did not affect parenchymal cells [31, 32]. Moreover, inhibition of EGFR signaling by erlotinib and other specific inhibitors effectively prevented the progression of cirrhosis and regressed fibrosis in some animals [33, 34] (Table 1).
3.3 FGFR
FGF family includes 7 subfamilies of growth factors (1, 4, 8, 9, 10, 11, 19) and four isoforms of their receptors (FGFR1, FGFR2, FGFR3, FGFR4), and all of them are involved in liver injury and regeneration. There is coordinated regulation of FGFR activation and FGFs secretion during liver injury and subsequent healing: hepatocyte-derived FGFs activate FGFRs on HSCs, and FGFs produced by HSCs activate FGFRs on hepatocytes [38]. FGF signaling during liver damage enhances liver regeneration, however, its chronic production can also lead to the abnormal regeneration with subsequent fibrosis development.
FGF2, a main FGFR1 binding partner, is a mitogen for HSCs. FGFR1 overexpression has been reported in human liver myofibroblasts and activated HSCs compared to the non-activated ones [37]. Then, FGF2 also induces chemotaxis and chemoinvasion by HSCs and may participate in the recruitment and activation of HSCs in acute liver injury. Thus, Yu et al. demonstrated, that chronic hepatic fibrosis is markedly reduced in FGF1/FGF2-deficient mice. However, the absence of FGF1 and FGF2 did not impair the total number of HSCs and their migration into the areas of injury, but overproduction of matrix components, especially collagen α1(I), by those, and therefore excessive fibrous tissue accumulation. The probable explanation is that FGF1 and FGF2 are not essential activating ligands for proliferation and migration of activated HSCs in vivo, but the important ones for fibrosis progression [43].
Furthermore, blockade of FGFR1 by small molecule inhibitors prevents HSCs activation (as evidenced by diminishing of α-SMA expression by those), inhibits their proliferation and release of the inflammatory cytokines by those both in vitro and in vivo. In vivo experiments also demonstrated that such inhibition significantly ameliorates CCl4-induced hepatic fibrosis in a rat model [44, 45].
The ability of FGFs to regulate HSCs proliferation, migration, and transdifferentiation makes FGFR signaling an attractive target for the treatment of hepatic fibrosis. Therapeutic agents which are developing now aim to inhibit FGFRs, to modulate FGF expression, are recombinant FGF proteins, therefore achieving to inhibit EGFR signaling in all levels [37].
3.4 PDGFR
PDGF is the most prominent cytokine that regulates HSCs activation, proliferation and migration. Primary producers of PDGF are platelets, vascular endothelial cells, pericytes and Kupffer cells. PDGFR, tyrosine kinase receptor, is primarily located in vascular endothelial cells, fibroblasts and Kupffer cells. Under the liver injury macrophages, injured endothelial cells and activated HSCs synthesize and secrete PDGF which stimulates proliferation of fibroblasts and vascular endothelial cells via autocrine and paracrine mechanisms. Additionally, PDGF promotes HSCs transformation into myofibroblasts and collagen production by those. Marked upregulation of PDGFR expression on the membranes of activated HSCs have been shown under various chronic liver diseases associated with its fibrosis. Hence, PDGFR overexpression contributes to HSCs activation by synthesized PDGF via the autocrine mechanism and enhances cellular chemotaxis [46]. Additionally, clinical studies demonstrated an excessive activation of PDGF and its downstream molecules, and association of those with the extent of fibrosis in patients with hepatic damage.
There are four PDGF subunits (A, B, C and D) and 2 types of PDGFRs (α and β), and all of them are involved in different stages of hepatic fibrogenesis. Thus, PDGF-B is elevated during the early stage of the disease and is the most potent factor associated with HSCs activation, whereas PDGF-C and -D levels continuously rise during the whole process of HSCs transformation into myofibroblasts and demonstrate relatively high level at the late stage of hepatic fibrosis. Then, quiescent HSCs express PDGFR-α only, and activated ones – predominantly PDGFR-β. The latter is substantially upregulated, and together with PDGF-B and -D serves important role in hepatic fibrosis [46].
Activated PDGFR induces many signaling pathways, which regulate cell proliferation, migration and survival. In particular, activated Ras system through MAPK signaling cascade regulates the expression of collagen type I, MMPs, TIMPs genes responsible for ECM synthesis and degradation; phospholipase Cγ (PLCγ) signaling contributes to HSCs mitosis; PDGFR-activated PI3K/Akt and JAK/STAT pathways promote cell migration, mediate metabolic regulation, stimulate cell growth and inhibit cellular apoptosis.
Blocking of PDGF signaling has been suggested to inhibit HSCs proliferation and to ameliorate liver fibrogenesis, so the strategies aimed to regulate that have been explored in preclinical and clinical investigations. Application of PDGF isoform antagonists, blocking of PDGFR activation and its downstream pathway regulation are considered as those ones. Thus, sorafenib (a first-line oral chemotherapy drug towards advanced hepatocellular carcinoma (HCC)) is a multikinase inhibitor that targets Raf, VEGFR2/3, and PDGFR-β and has been demonstrated to be a potent antifibrotic agent. The mechanisms of its antifibrotic action were revealed on mice models (high fat diet-, BDL- and DEN- induced ones) and include HSCs autophagy and apoptosis induction (through activation of Akt/mTOR and MAPK signaling pathways), suppression of neovascularization and oxidative stress (through PDGF, STAT3 and mitochondrial respiration downregulation), and inhibition of collagen deposition [47]. Imatinib, another selective TKI, which specifically targets PDGFR, attenuates liver fibrosis and additionally inhibits PDGFR-β expression and decreases the levels of proinflammatory cytokines. The ability of imatinib to induce HSCs apoptosis and substantially decrease their migration could contribute a lot to antifibrotic activity of that and was proven in vitro and on CCl4- and thioacetamide (TAA)-induced mice models [35] (Table 1). Strong antifibrotic activity under cholestatic liver diseases has been demonstrated for small molecule roseotoxin B, and investigation of its possible mechanisms revealed its ability to block the PDGF-B/PDGFR-β pathway in HSCs directly [48].
The great potency of PDGFR inhibitors was demonstrated on numerous animal and in vitro models. However, it is difficult and often impossible to distinguish the antifibrotic activity from anticancer one due to analysis of clinical trials outcomes. The first reason is that these agents are tested as anti-HCC therapeutics, and outcomes important for anticancer assessment only (like overall survival, disease-free survival etc.) are considered. The second possible reason is strong stratification of HCC patients involved in clinical trial according to their cirrhotic stage, and, despite “anticancer-important” outcomes are monitored thoroughly, the level of cirrhosis is not reassessed. So anticancer activity of the chemicals might be accompanied with antifibrotic one, however, it should be checked additionally. Furthermore, due to high similarity of the homologous domains of PDGFR and VEGFR, applied TKIs like sorafenib, sunitinib and pazopanib could not only inhibit PDGFR activation but also downregulate VEGFR (Table 1). It could indicate the complex and therefore more powerful action of these drugs on liver fibrogenesis, but, on the other hand, could also lead to non-target cells impairment and additional toxicity [49].
3.5 TGFβR
TGF-β is a cytokine which plays a prominent role in transformation of HSCs to myofibroblasts. Indeed, many of TGF-β pathological effects could be related with its ability to regulate cell plasticity – change of cell phenotype and function due to genetic and epigenetic changes and cytoskeleton remodeling. One of the most striking events of cell plasticity is epithelial-mesenchymal transition (EMT). Activation of HSCs and their transformation to myofibroblasts is an example of that one. Moreover, another example of cell transformation caused by TGF-β is EMT in hepatocytes accompanied with loss of cell–cell contacts and polarity [50]. Actually, TGF-β stimulates almost of all liver cell populations (portal and resident fibroblasts, bone marrow-derived fibrocytes, endothelial cells, vascular smooth muscle cells, pericytes and cholangiocytes additionally to hepatocytes and HSCs) to change into a more fibroblastic phenotype [40] and to release profibrogenic transcriptional program manifested by upregulation of collagen expression [41] and disturbances in ECM turnover through imbalance between MMPs and TIMPs. TGF-β receptors (TGFβRI and TGFβRII) are Ser/Tre protein kinases expressed on the membranes of various cells including all above mentioned ones. TGF-β is secreted by these cells and regulates their activity by autocrine and paracrine mechanisms. Moreover, both monocyte-derived macrophages and Kupffer cells (liver resident macrophages) produce this cytokine and some other profibrogenic factors like PDGF and connective tissue growth factor (CTGF), contributing, therefore, to HSCs activation and transdifferentiation, and promoting fibrosis [39]. Thus, TGF-β plays a master role in the activation of HSCs to myofibroblasts. In fact, some of the previous factors stimulate the expression, production and activation of TGF-β, which is responsible finally for the activation of HSCs, and the higher the level of TGF-β the more expressed fibrotic changes in the tissue.
The main mediators of the TGF-β-induced fibrogenic transcriptional program are SMADs (Caenorhabditis elegans Sma genes and the Drosophila Mad, Mothers against decapentaplegic) [41] (Figure 1). Moreover, proteins enriched in TGFR signaling involve Src, cAMP response element-binding protein (CREBP) and others, and some of them belong to EGFR signaling, indicating the crosstalk between these pathways [51]. Additionally, TGF-β1 also mediates the role of FGF1 and FGF2 in the deposition of ECM, or FGF1 and FGF2 mediate the TGF-β activity, or both factors play independent roles through convergent signaling pathways in vivo [43].
4. Multikinase inhibitors
Some TKIs have been shown to release antifibrotic activity do not demonstrate exact specificity against their targets and could inhibit more than one receptor. So, it is difficult to explain the mechanism of their action precisely. Nevertheless, these agents attract the attention and reveal the antifibrotic potency even more than specific inhibitors because of multiplicity of mechanisms and downregulated signaling pathways, and therefore, ability to avoid drug resistance through the compensatory mechanisms and signaling crosstalk.
For example, multikinase TKI nilotinib, which is a breakpoint cluster region protein (Bcr)-tyrosine-protein kinase ABL (Abl) inhibitor, also significantly inhibited PDGFR and TGFβRII, which contributes to depression of HSCs activation, proliferation, migration, and α-SMA formation, induction of their apoptosis, reduce collagen deposition in activated HSCs and in liver tissues of CCl4- and BDL-induced rats experienced liver fibrosis [52]. Moreover, the effects of nilotinib also include diminished expression of VEGF and VEGFR, which, however, is expected due to high similarity of PDGFR and VEGFR kinase domains. These results indicated that nilotinib may represent a putative antifibrotic treatment due to its combined inhibition of non-receptor tyrosine kinases (nonRTK) (Abl) and RTK (PDGFR-β, TGFβRII and VEGFR) (Table 1).
Treatment of CCl4-induced fibrotic mice with nintedanib that blocks PDGFR, VEGFR and FGFR, in addition to depression of HSCs activation, contractility, migration, and collagen deposition, inhibited macrophage migration, intrahepatic inflammation and angiogenesis as well [36]. Another oral multitargeted TKI pazopanib (approved for renal cell sarcoma treatment) directly inhibits PDGFRs, FGFRs, mast/stem cell growth factor receptor (KIT) and selectively suppresses VEGFR-mediated angiogenesis. The drug can halt liver fibrosis progression through modulating inflammatory cytokines, suppressing HSCs activation, inducing their apoptosis, and regulating angiogenesis [53]. Regorafenib could affect similar targets (VEGFR1–3, PDGFR-β and FGFR) and also potently inhibits another angiogenic RTK TIE2. This drug has recently been approved as a second-line therapy for HCC and demonstrated depression of cirrhotic-associated systemic changes and portal hypertension in HCC patients. Moreover, regorafenib might also be beneficial towards fibrosis and portal hypertension even in absence of HCC [42]. Despite regorafenib treatment had no direct observable effect on HSCs activation and fibrosis progression or regression (as evidenced by liver histopathology, α-SMA and hydroxyproline deposition), however, even its acute administration improved cirrhotic portal hypertension (BDL and CCl4 models of liver fibrosis) and also hemodynamic circulation in an animal model mimicking portal vein thrombosis [54] (Table 1). These findings might explain the anticirrhotic effects of the drug in HCC patients by normalization of liver blood circulation in fibrotic liver and therefore exhausting the inflammatory microenvironment which leads to fibrosis progression.
Brivanib is a selective inhibitor of VEGFR and FGFR and also affects liver fibrosis through multiple signaling pathways. Nakamura et al. demonstrated that brivanib decreased HSCs proliferation induced by PDGF, VEGF and FGF treatment, and also abrogated the phosphorylation of PDGFRβ, which was confirmed in vitro and on BDL-, CCl4- and TAA-induced mice models and supported by histopathological evidences of liver fibrosis alleviation [17] (Table 1).
Our team developed the set of multikinase inhibitors, and one of them (1-(4-Cl-benzyl)-3-chloro-4-(CF3-phenylamino)-1H-pyrrole-2,5-dione, called MI1) demonstrated high inhibitory activity against EGFR, VEGFR1,2,3 (the most prominent results), FGF-R1, IGF1-R, spleen associated tyrosine kinase (Syk), 3-phosphoinositide-dependent protein kinase-1 (PDK1), and Src [55]. Besides anticancer and anti-inflammatory activity having been revealed in our previous investigations [56, 57], we showed that MI1 could inhibit liver fibrosis development on rat acute (3 days) and chronic (28 days) cholangitis models, as evidenced by substantially depleted connective tissue deposits in liver and improved liver general state (according to plasma biochemical tests). Moreover, antifibrotic effects of MI1 preserved through at least 28 days since the interventions were terminated (unpublished data, under consideration).
Thus, multikinase inhibitors might be more potent antifibrotic treatments through their impact on several signaling pathways. However, this task should be explored in more detail because of high probability of adverse effects due to multiplicity of these drugs’ targets.
5. Small molecule inhibitors of RTK signaling – “noncanonical” approach
Inhibitors of RTK signaling include not only molecules designed to block ATP-binding sites of the kinase, but also small therapeutic molecules with different activities, which, however, could additionally inhibit RTK. For example, natural antioxidant of polyphenol origin resveratrol despite of different therapeutic activities (anti-inflammatory, antitumor, antiaging, protective etc.) demonstrated also strong antifibrotic effect against liver cirrhosis (CCl4- model) [58]. The mechanisms of its action are different and include predominantly antioxidant capability, but also impact on gene expression and ability to modulate different signaling pathways through interaction with their key molecules. Among others, resveratrol could downregulate EGFR/Akt/ERK1/2 signaling pathway particularly by decrease of EGFR activation [59]. Furthermore, this polyphenol could scavenge VEGF, altering, therefore, its binding with VEGFR and activation of the latter [60]. Of course, this action could not be interpreted as direct impact on VEGFR. However, it deserves to be considered as an approach for modulation of this signaling activity on its initial stages.
Another plant-derived polyphenol curcumin among various types of biological activities (anticancer, antiviral, antioxidant, anti-inflammatory ones) had beneficial effects in animal models of liver injury and cirrhosis [61]. While studying the possible mechanisms of its action, substantial reduce of TGFβRII levels and its downstream molecules Smad2/3 phosphorylation in response to added TGF-β was found [62]. Furthermore, curcumin revealed anti-EGFR activity: firstly, it was able to inhibit directly the enzymatic activity of the EGFR intracellular domain, and, secondly, it could influence the cell membrane environment of the receptor [63, 64].
Ability to affect the membrane environment of the receptor and thus alter its binding with ligand and subsequent activation has been shown for biologically active indolic related compounds including melatonin, 3-indoleacetic acid, 5-hydroxytryptophol, and serotonin. These chemicals are proven to significantly inhibit VEGF-induced VEGFR2 activation in human umbilical vein endothelial cells through interacting with the cell surface components in a way that prevents VEGF from activating the receptor [65]. This property could contribute to the hepatoprotective and antifibrotic efficacy of melatonin realizing by inhibition of inflammation, HSCs proliferation and hepatocyte apoptosis [66]. The similar mechanism of RTK inhibition has been considered for natural cyclopeptide destruxin A5, that effectively downregulate PDGF-B-induced PDGFR-β signaling. Destruxin A5 does not bind to the ATP-binding pocket of PDGFR-β, so the inhibitory mechanism of that is distinct from the mechanism of “canonical” TKIs. It looks like this chemical selectively targets PDGF-β/PDGFR-β interaction interface and blocks this signaling [67].
However, some non-specific small molecules are able to inhibit RTK by “classical” mechanism – through binding to receptor and preventing its activation by ligand. A naturally occurring flavone 4′,5,7-trihydroxy-3′,5′-dimethoxyflavone (tricin) is one of them. Tricin affected HSCs in vitro exploring its potential as antifibrotic therapeutic, as evidenced by inhibiting of human HSC line LI90 and culture-activated HSCs proliferation and migration by that. This flavone reduced the phosphorylation of PDGFRβ and downstream signaling molecules ERK1/2 and Akt, which might be due to its TKI properties rather than inhibition of the direct binding between PDGF-B and its receptor [68]. Flavonoid quercetin was reported to exhibit a wide range of pharmacological properties, including its ability to attenuate liver fibrosis by multiple mechanisms involving several signaling pathways [69]. In particular, quercetin was found to suppress the phosphorylation of EGFR by direct binding with its ATP-binding site [70]. A powerful free radical scavenger carbon-based nanoparticle C60 fullerene could be considered as another unusual RTK inhibitor. It explores wide range of biological activities including antifibrotic and anticirrhotic ones [71, 72, 73, 74, 75] probably realized by its antioxidant capacity. However, we also demonstrated its ability to bind to ATP-binding pockets of EGFR and FGFR and to avoid interaction of those with ATP [75], which could be an alternative mechanism of this nanoparticle’s antifibrotic action.
6. Conclusions
Growth factor receptors, in particular EGFR, VEGFR, PDGFR, FGFR, and TGFβR are proven to be key regulators of various liver cell populations behavior under hepatic injury and reparation, and subsequent fibrosis development if “something has been going wrong”. Upregulation of related signaling pathways has been shown in numerous in vitro and in vivo models, and for patients who experienced liver diseases accompanied by its fibrosis as well. Inhibiting of those by specific and non-specific compounds followed by fibrosis depression. Above mentioned suggests the potency of RTK inhibition as an antifibrotic treatment. However, all the clinical evidences dedicated to that are rather “concomitant” to TKIs anticancer activity because of predominant focus of these studies on the therapy of liver malignancies developed on cirrhotic background. However, we should remember that liver fibrosis and subsequent cirrhosis are severe high-morbidity diseases themselves. And our knowledge about mechanisms of liver fibrosis development and essential RTKs involvement in that, as well as our achievements in the field of liver fibrosis therapy by TKIs should not be neglected.
Conflict of interest
The authors declare that they have no conflict of interest.
\n',keywords:"EGFR, VEGFR, PDGFR, FGFR, TGFβR, tyrosine kinase inhibitors",chapterPDFUrl:"https://cdn.intechopen.com/pdfs/75658.pdf",chapterXML:"https://mts.intechopen.com/source/xml/75658.xml",downloadPdfUrl:"/chapter/pdf-download/75658",previewPdfUrl:"/chapter/pdf-preview/75658",totalDownloads:222,totalViews:0,totalCrossrefCites:0,dateSubmitted:"November 19th 2020",dateReviewed:"February 9th 2021",datePrePublished:"March 10th 2021",datePublished:"July 28th 2021",dateFinished:"March 10th 2021",readingETA:"0",abstract:"The background of liver fibrous degeneration is excessive cell proliferation including hepatic stellate cells, inflammatory cells, fibroblasts and myofibroblasts. Often it is the consequence of increased growth factors and/or their receptors expression. Key contributors to the liver cell proliferation are EGFR, FGFR, PDGFR, VEGFR, TGFβR, the increased expression of which is indicated on in vitro and in vivo models of liver fibrosis and in patients who experienced fibrosis-accompanied liver diseases. Elimination of growth factors/suppression of their receptors is associated with the weakening/elimination of certain processes responsible for fibrogenesis. This chapter represents the evidences of the efficacy of growth factor receptors signaling downregulation for the suppression of liver fibrosis and cirrhosis and their individual manifestations. The data on established and experimental therapeutics – specific and multikinase growth factor receptor inhibitors which demonstrated antifibrotic and anticirrhotic activity under in vitro and in vivo models, are also presented.",reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/75658",risUrl:"/chapter/ris/75658",signatures:"Halyna Kuznietsova and Olexandr Ogloblya",book:{id:"10326",type:"book",title:"Advances in Hepatology",subtitle:null,fullTitle:"Advances in Hepatology",slug:"advances-in-hepatology",publishedDate:"July 28th 2021",bookSignature:"Luis Rodrigo, Ian Martins, Xiaozhong Guo and Xingshun Qi",coverURL:"https://cdn.intechopen.com/books/images_new/10326.jpg",licenceType:"CC BY 3.0",editedByType:"Edited by",isbn:"978-1-83968-624-5",printIsbn:"978-1-83968-623-8",pdfIsbn:"978-1-83968-625-2",isAvailableForWebshopOrdering:!0,editors:[{id:"73208",title:"Prof.",name:"Luis",middleName:null,surname:"Rodrigo",slug:"luis-rodrigo",fullName:"Luis Rodrigo"}],productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"}},authors:[{id:"340572",title:"Ph.D.",name:"Halyna",middleName:null,surname:"Kuznietsova",fullName:"Halyna Kuznietsova",slug:"halyna-kuznietsova",email:"biophyz@gmail.com",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",institution:null},{id:"347403",title:"Dr.",name:"Olexandr",middleName:null,surname:"Ogloblya",fullName:"Olexandr Ogloblya",slug:"olexandr-ogloblya",email:"olexandr.ogloblya@gmail.com",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",institution:{name:"Taras Shevchenko National University of Kyiv",institutionURL:null,country:{name:"Ukraine"}}}],sections:[{id:"sec_1",title:"1. Introduction",level:"1"},{id:"sec_2",title:"2. The role of growth factors and their receptors in fibrogenesis",level:"1"},{id:"sec_3",title:"3. Growth factor receptors as the targets of antifibrotic therapy",level:"1"},{id:"sec_3_2",title:"3.1 VEGFR",level:"2"},{id:"sec_4_2",title:"3.2 EGFR",level:"2"},{id:"sec_5_2",title:"3.3 FGFR",level:"2"},{id:"sec_6_2",title:"3.4 PDGFR",level:"2"},{id:"sec_7_2",title:"3.5 TGFβR",level:"2"},{id:"sec_9",title:"4. Multikinase inhibitors",level:"1"},{id:"sec_10",title:"5. Small molecule inhibitors of RTK signaling – “noncanonical” approach",level:"1"},{id:"sec_11",title:"6. Conclusions",level:"1"},{id:"sec_15",title:"Conflict of interest",level:"1"}],chapterReferences:[{id:"B1",body:'Qiao J. Occurrence, diagnosis and management of hepatic fibrosis and cirrhosis: An updated literature review. Arch Hepat Res.2019;5(1):022-026. DOI: 10.17352/ahr.000023'},{id:"B2",body:'Rieder F, Fiocchi C, Rogler G. 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Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
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Shohel"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},subject:{topic:{id:"424",title:"Phycology",slug:"phycology",parent:{id:"59",title:"Microbiology",slug:"biochemistry-genetics-and-molecular-biology-microbiology"},numberOfBooks:3,numberOfSeries:0,numberOfAuthorsAndEditors:56,numberOfWosCitations:100,numberOfCrossrefCitations:94,numberOfDimensionsCitations:258,videoUrl:null,fallbackUrl:null,description:null},booksByTopicFilter:{topicId:"424",sort:"-publishedDate",limit:12,offset:0},booksByTopicCollection:[{type:"book",id:"9354",title:"Microalgae",subtitle:"From Physiology to Application",isOpenForSubmission:!1,hash:"affa344272fbd8d5cd80cab53f814303",slug:"microalgae-from-physiology-to-application",bookSignature:"Milada Vítová",coverURL:"https://cdn.intechopen.com/books/images_new/9354.jpg",editedByType:"Edited by",editors:[{id:"253951",title:"Dr.",name:"Milada",middleName:null,surname:"Vítová",slug:"milada-vitova",fullName:"Milada Vítová"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"6889",title:"Algae",subtitle:null,isOpenForSubmission:!1,hash:"13797d037dd9bd0c3f7a232fff1c759d",slug:"algae",bookSignature:"Yee Keung Wong",coverURL:"https://cdn.intechopen.com/books/images_new/6889.jpg",editedByType:"Edited by",editors:[{id:"227706",title:"Dr.",name:"Yee Keung",middleName:null,surname:"Wong",slug:"yee-keung-wong",fullName:"Yee Keung Wong"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"5128",title:"Algae",subtitle:"Organisms for Imminent Biotechnology",isOpenForSubmission:!1,hash:"01a35d1259dcce526d25cf3f23237696",slug:"algae-organisms-for-imminent-biotechnology",bookSignature:"Nooruddin Thajuddin and Dharumadurai Dhanasekaran",coverURL:"https://cdn.intechopen.com/books/images_new/5128.jpg",editedByType:"Edited by",editors:[{id:"89852",title:"Dr.",name:"Nooruddin",middleName:null,surname:"Thajuddin",slug:"nooruddin-thajuddin",fullName:"Nooruddin Thajuddin"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}],booksByTopicTotal:3,seriesByTopicCollection:[],seriesByTopicTotal:0,mostCitedChapters:[{id:"50544",doi:"10.5772/62909",title:"Algal Nanoparticles: Synthesis and Biotechnological Potentials",slug:"algal-nanoparticles-synthesis-and-biotechnological-potentials",totalDownloads:5784,totalCrossrefCites:17,totalDimensionsCites:67,abstract:"A nanoparticle can be defined as a small object that behaves as a whole unit in terms of its transport and properties. Nanoparticles are sized between 1 and 100 nm in diameter. Nanoparticles can act against the microbes in multiple ways, and the microbes are less likely to develop resistance against nanoparticles because it requires multiple gene mutations. The large surface-to-volume ratio of nanoparticles, their ability to easily interact with other particles, and several other features make them attractive tools in various fields. Nanoparticles are widely used various fields such as electronics, cosmetics, biomedical, and biotechnology. Nanoparticles can be synthesized by physical methods such as attrition, pyrolysis, and using some wet chemical methods. The physical and chemical methods have various drawbacks such as high cost of production, require high energy input and generation of toxic by-products. To overcome this, several biological methods are employed in the synthesis of nanoparticles. The biological methods are generally cost effective, nontoxic, and ecofriendly. This chapter focuses on the methods involved in algal-synthesized nanoparticles and its applications.",book:{id:"5128",slug:"algae-organisms-for-imminent-biotechnology",title:"Algae",fullTitle:"Algae - Organisms for Imminent Biotechnology"},signatures:"Felix LewisOscar, Sasikumar Vismaya, Manivel Arunkumar,\nNooruddin Thajuddin, Dharumadurai Dhanasekaran and Chari\nNithya",authors:[{id:"183668",title:"Dr.",name:"Nithya",middleName:null,surname:"Chari",slug:"nithya-chari",fullName:"Nithya Chari"}]},{id:"51074",doi:"10.5772/62916",title:"Algae as an Indicator of Water Quality",slug:"algae-as-an-indicator-of-water-quality",totalDownloads:5034,totalCrossrefCites:11,totalDimensionsCites:23,abstract:"The formation of plankton/algae under natural conditions is related to tolerance class (ecological optimum) due to abiotic limiting factors of ecosystem, as well as the biotic interactions among algae. In the ecological niche, the appearance of organisms is affected by anthropogenic and non-anthropogenic environmental factors. Algae composition and temporal variation in abundances are important in determining the trophic level of lakes. Algal communities are sensitive to changes in their habitat, and thus, total biomass of algae and many algae species are used as indicators of water quality. Algae communities give more knowledge on variations in water quality than nutrient or chlorophyll-a values. Water quality is a canonical group of physical, chemical, and biological properties of the given water. Consequently, eutrophication of freshwater is regarded as a water quality which results in the degeneration of the aquatic ecosystem and affects water utilisation. Cyanobacteria has been accepted as a major indicator of eutrophication in freshwater as their blooms are common in waters affected by nutrient concentration. The purpose of this chapter is to assess physical and chemical variables and the role of algal abundance to determine the water quality in the freshwater ecosystems.",book:{id:"5128",slug:"algae-organisms-for-imminent-biotechnology",title:"Algae",fullTitle:"Algae - Organisms for Imminent Biotechnology"},signatures:"Didem Gökçe",authors:[{id:"178260",title:"Associate Prof.",name:"Didem",middleName:null,surname:"Gokce",slug:"didem-gokce",fullName:"Didem Gokce"}]},{id:"50534",doi:"10.5772/63069",title:"Considerations for Photobioreactor Design and Operation for Mass Cultivation of Microalgae",slug:"considerations-for-photobioreactor-design-and-operation-for-mass-cultivation-of-microalgae",totalDownloads:5994,totalCrossrefCites:8,totalDimensionsCites:17,abstract:"Microalgae have great biotechnological potential for production of substances through photosynthesis. Light capture process and electron transportation imply energy losses due to reflection, fluorescence emission, and energy dissipation as heat, giving a maximum theoretical value of 8‐9% for microalgae energy capture efficiency and conversion to biomass. For development of full potential of microalgae the knowledge of the light capture process is required. High yields can only be obtained linking photobioreactor design with biological process taking place inside. In massive microalgae cultures, light gradients are generated and this depends on the biomass concentration, cellular types, cells sizes, and pigment content, and also on geometry, hydrodynamic, and light conditions inside the photobioreactor. In the present chapter we explain the relationship between light energy capture process and photobioreactor design and operation conditions, like turbulence, gas exchange, and nutrient requirements. Finally, the productivity and costs are discussed, and the parameters that determine the economic viability of any microalgae culture.",book:{id:"5128",slug:"algae-organisms-for-imminent-biotechnology",title:"Algae",fullTitle:"Algae - Organisms for Imminent Biotechnology"},signatures:"Juan Cristóbal García Cañedo and Gema Lorena López Lizárraga",authors:[{id:"185868",title:"Dr.",name:"Gema Lorena",middleName:null,surname:"López-Lizárraga",slug:"gema-lorena-lopez-lizarraga",fullName:"Gema Lorena López-Lizárraga"},{id:"293413",title:"Dr.",name:"Juan Cristóbal",middleName:null,surname:"García Cañedo",slug:"juan-cristobal-garcia-canedo",fullName:"Juan Cristóbal García Cañedo"}]},{id:"69201",doi:"10.5772/intechopen.89324",title:"Drying and Quality of Microalgal Powders for Human Alimentation",slug:"drying-and-quality-of-microalgal-powders-for-human-alimentation",totalDownloads:1263,totalCrossrefCites:5,totalDimensionsCites:15,abstract:"The demand for natural foods with high protein content and functional properties is constantly growing in the last years. In this context, microalgae as Spirulina (Arthrospira spp.), Chlorella spp., Haematococcus pluvialis, Dunaliella salina, and others, assume a key role to diversify the offer of nutritious and functional ingredients and supplements. Microalgae are commercialized, mostly, as dried powders to facilitate their use as food ingredients and to allow easy transportation and long-term stability. Microalgal powder quality and storage stability depend mainly on drying method, packaging, and storage conditions. Most of the studies that approach the subject of microalgal drying evaluate the efficiency of the process and suitability for this raw material. However, studies that assess the effect of traditional and innovative drying methods on quality of microalgal powder for human consumption are rare in literature. In this chapter, the state of the art of drying processing technology for microalgae was reviewed, discussing the effect of dehydration on quality and stability of microalgal powders with potential use in human alimentation.",book:{id:"9354",slug:"microalgae-from-physiology-to-application",title:"Microalgae",fullTitle:"Microalgae - From Physiology to Application"},signatures:"Fábio de Farias Neves, Mariana Demarco and Giustino Tribuzi",authors:null},{id:"50671",doi:"10.5772/63272",title:"Challenges and Opportunities in the Present Era of Marine Algal Applications",slug:"challenges-and-opportunities-in-the-present-era-of-marine-algal-applications",totalDownloads:2747,totalCrossrefCites:3,totalDimensionsCites:12,abstract:"Marine algae are of high importance in their natural habitats and even more now in the world of green technology. The sprouting interest of the scientific community and industries in these organisms is driven by the fast-growing world of modern biotechnology. Genomics, transcriptomics, proteomics, metabolomics and their integration collectively termed here as ‘marine algal-omics’ have broadened the research horizon in view of enhancing human’s life by addressing environmental problems and encouraging novelty in the field of pharmaceuticals among so many more. Their use in the human society dates back to 500 B. C. in China and later across the globe; they are still being used for similar purposes and more today. There is a hiking interest in marine algae and their derivatives—from phycoremediation, food supplements, pharmaceuticals to dyes. Marine algae are currently considered as an emerging panacea for the society. They are being studied in a multitude of arenas. The multi-use of marine algae is enticing and promises to be a boon for industrial applications. Yet, most marine algae face challenges that might variably constrain their commercialisation. This chapter gives an overview of marine algae including all the ‘omics’ technologies involved in studying marine algae and it explores their multitude applications. It also draws the various successful industries budded around them and presents some of the challenges and opportunities along with future directions.",book:{id:"5128",slug:"algae-organisms-for-imminent-biotechnology",title:"Algae",fullTitle:"Algae - Organisms for Imminent Biotechnology"},signatures:"Keshini Beetul, Arvind Gopeechund, Deepeeka Kaullysing, Sushma\nMattan-Moorgawa, Daneshwar Puchooa and Ranjeet Bhagooli",authors:[{id:"178209",title:"Ms.",name:"Keshini",middleName:null,surname:"Beetul",slug:"keshini-beetul",fullName:"Keshini Beetul"},{id:"184390",title:"Mr.",name:"Arvind",middleName:null,surname:"Gopeechund",slug:"arvind-gopeechund",fullName:"Arvind Gopeechund"},{id:"184391",title:"Ms.",name:"Deepeeka",middleName:null,surname:"Kaullysing",slug:"deepeeka-kaullysing",fullName:"Deepeeka Kaullysing"},{id:"184392",title:"Mrs.",name:"Sushma",middleName:null,surname:"Mattan-Moorgawa",slug:"sushma-mattan-moorgawa",fullName:"Sushma Mattan-Moorgawa"},{id:"184393",title:"Prof.",name:"Daneshwar",middleName:null,surname:"Puchooa",slug:"daneshwar-puchooa",fullName:"Daneshwar Puchooa"},{id:"184394",title:"Dr.",name:"Ranjeet",middleName:null,surname:"Bhagooli",slug:"ranjeet-bhagooli",fullName:"Ranjeet Bhagooli"}]}],mostDownloadedChaptersLast30Days:[{id:"64156",title:"Cyanobacteria Growth Kinetics",slug:"cyanobacteria-growth-kinetics",totalDownloads:1799,totalCrossrefCites:2,totalDimensionsCites:5,abstract:"Harmful cyanobacterial blooms are a global problem for freshwater ecosystems used for drinking water supply and recreational purposes. Cyanobacteria also produce a wide variety of toxic secondary metabolites, called cyanotoxins. High water temperatures have been known to lead to cyanobacterial bloom development in temperate and semiarid regions. Increased temperatures as a result of climate change could therefore favor the growth of cyanobacteria, thus augmenting the risks associated with the blooms. Though temperature is the main factor affecting the growth kinetics of bacteria, the availability of nutrients such as nitrogen and phosphorus also plays a significant role. This chapter studies the growth kinetics of toxin-producing Microcystis aeruginosa and evaluates potential risks to the population in scenarios of climate change and the presence of nutrients. The most suitable control methods for mitigation are also evaluated.",book:{id:"6889",slug:"algae",title:"Algae",fullTitle:"Algae"},signatures:"Leda Giannuzzi",authors:[{id:"252117",title:"Dr.",name:"Leda",middleName:null,surname:"Giannuzzi",slug:"leda-giannuzzi",fullName:"Leda Giannuzzi"}]},{id:"65952",title:"CO2 Capture for Industries by Algae",slug:"co-sub-2-sub-capture-for-industries-by-algae",totalDownloads:2102,totalCrossrefCites:5,totalDimensionsCites:11,abstract:"The increased usage of fossil fuels has led to increase in the concentration of CO2, which is a greenhouse gas responsible for global warming. Algae-based CO2 conversion is a cost-effective option for reducing carbon footprint. In addition, algae-based CO2 mitigation strategy has the potential to obtain valuable products at the end of the process. In the present study, freshwater algal species were isolated and identified for CO2 capture, such as Hydrodictyon, Spirogyra, Oscillatoria, Oedogonium, and Chlorella. The algal strains were screened based on different parameters like fast growth rate, high rate of photosynthesis, strong tolerance to the trace constituents of other gases (gaseous hydrocarbons, NOx, SOx, etc.), high temperature tolerance, and possibility to produce high value products, etc. The study involves integrated methods for utilizing 90–99% CO2 from a natural gas processing industry (GAIL India, Ltd.) as well as 13–15% of CO2 from flue gas of thermal power plants (Chandrapura and Santaldih Thermal Power Station) as carbon nutrient source along with the additional nutritional supplements. A 400-ml and 25-l flat panel photo-bioreactor (PSI Photo-bioreactors) was used for CO2 capture. After CO2 capture, the algal biomass was used to extract value-added products such as amino acid rich feed, algal oil, algal pellets, etc.",book:{id:"6889",slug:"algae",title:"Algae",fullTitle:"Algae"},signatures:"Vetrivel Anguselvi, Reginald Ebhin Masto, Ashis Mukherjee and Pradeep Kumar Singh",authors:[{id:"255851",title:"Dr.",name:"Vetrivel",middleName:null,surname:"Anguselvi",slug:"vetrivel-anguselvi",fullName:"Vetrivel Anguselvi"},{id:"269996",title:"Dr.",name:"R E",middleName:null,surname:"Masto",slug:"r-e-masto",fullName:"R E Masto"},{id:"269997",title:"Dr.",name:"Ashis",middleName:null,surname:"Mukherjee",slug:"ashis-mukherjee",fullName:"Ashis Mukherjee"},{id:"270059",title:"Dr.",name:"P K",middleName:null,surname:"Singh",slug:"p-k-singh",fullName:"P K Singh"}]},{id:"51074",title:"Algae as an Indicator of Water Quality",slug:"algae-as-an-indicator-of-water-quality",totalDownloads:5034,totalCrossrefCites:11,totalDimensionsCites:23,abstract:"The formation of plankton/algae under natural conditions is related to tolerance class (ecological optimum) due to abiotic limiting factors of ecosystem, as well as the biotic interactions among algae. In the ecological niche, the appearance of organisms is affected by anthropogenic and non-anthropogenic environmental factors. Algae composition and temporal variation in abundances are important in determining the trophic level of lakes. Algal communities are sensitive to changes in their habitat, and thus, total biomass of algae and many algae species are used as indicators of water quality. Algae communities give more knowledge on variations in water quality than nutrient or chlorophyll-a values. Water quality is a canonical group of physical, chemical, and biological properties of the given water. Consequently, eutrophication of freshwater is regarded as a water quality which results in the degeneration of the aquatic ecosystem and affects water utilisation. Cyanobacteria has been accepted as a major indicator of eutrophication in freshwater as their blooms are common in waters affected by nutrient concentration. The purpose of this chapter is to assess physical and chemical variables and the role of algal abundance to determine the water quality in the freshwater ecosystems.",book:{id:"5128",slug:"algae-organisms-for-imminent-biotechnology",title:"Algae",fullTitle:"Algae - Organisms for Imminent Biotechnology"},signatures:"Didem Gökçe",authors:[{id:"178260",title:"Associate Prof.",name:"Didem",middleName:null,surname:"Gokce",slug:"didem-gokce",fullName:"Didem Gokce"}]},{id:"64455",title:"Cyanobacteria for PHB Bioplastics Production: A Review",slug:"cyanobacteria-for-phb-bioplastics-production-a-review",totalDownloads:2186,totalCrossrefCites:4,totalDimensionsCites:11,abstract:"Cyanobacteria, or blue-green algae, can be used as host to produce polyhydroxyalkanoates (PHA), which are promising bioplastic raw materials. The most important material thereof is polyhydroxybutyrate (PHB), which can replace the commodity polymer polypropylene (PP) in many applications, yielding a bio-based, biodegradable alternative solution. The advantage from using cyanobacteria to make PHB over the standard fermentation processes, with sugar or other organic (waste) materials as feedstock, is that the sustainability is better (compare first-generation biofuels with the feed vs. fuel debate), with CO2 being the only carbon source and sunlight being the sole energy source. In this review article, the state of the art of cyanobacterial PHB production and its outlook is discussed. Thirty-seven percent of dry cell weight of PHB could be obtained in 2018, which is getting close to up to 78% of PHB dry cell weight in heterotrophic microorganisms in fermentation reactors. A good potential for cyanobacterial PHB is seen throughout the literature.",book:{id:"6889",slug:"algae",title:"Algae",fullTitle:"Algae"},signatures:"Erich Markl, Hannes Grünbichler and Maximilian Lackner",authors:[{id:"251081",title:"Dr.",name:"Maximilian",middleName:null,surname:"Lackner",slug:"maximilian-lackner",fullName:"Maximilian Lackner"},{id:"255232",title:"Prof.",name:"Erich",middleName:null,surname:"Markl",slug:"erich-markl",fullName:"Erich Markl"},{id:"277237",title:"Dr.",name:"Hannes",middleName:null,surname:"Grünbichler",slug:"hannes-grunbichler",fullName:"Hannes Grünbichler"}]},{id:"50544",title:"Algal Nanoparticles: Synthesis and Biotechnological Potentials",slug:"algal-nanoparticles-synthesis-and-biotechnological-potentials",totalDownloads:5784,totalCrossrefCites:17,totalDimensionsCites:67,abstract:"A nanoparticle can be defined as a small object that behaves as a whole unit in terms of its transport and properties. Nanoparticles are sized between 1 and 100 nm in diameter. Nanoparticles can act against the microbes in multiple ways, and the microbes are less likely to develop resistance against nanoparticles because it requires multiple gene mutations. The large surface-to-volume ratio of nanoparticles, their ability to easily interact with other particles, and several other features make them attractive tools in various fields. Nanoparticles are widely used various fields such as electronics, cosmetics, biomedical, and biotechnology. Nanoparticles can be synthesized by physical methods such as attrition, pyrolysis, and using some wet chemical methods. The physical and chemical methods have various drawbacks such as high cost of production, require high energy input and generation of toxic by-products. To overcome this, several biological methods are employed in the synthesis of nanoparticles. The biological methods are generally cost effective, nontoxic, and ecofriendly. This chapter focuses on the methods involved in algal-synthesized nanoparticles and its applications.",book:{id:"5128",slug:"algae-organisms-for-imminent-biotechnology",title:"Algae",fullTitle:"Algae - Organisms for Imminent Biotechnology"},signatures:"Felix LewisOscar, Sasikumar Vismaya, Manivel Arunkumar,\nNooruddin Thajuddin, Dharumadurai Dhanasekaran and Chari\nNithya",authors:[{id:"183668",title:"Dr.",name:"Nithya",middleName:null,surname:"Chari",slug:"nithya-chari",fullName:"Nithya Chari"}]}],onlineFirstChaptersFilter:{topicId:"424",limit:6,offset:0},onlineFirstChaptersCollection:[],onlineFirstChaptersTotal:0},preDownload:{success:null,errors:{}},subscriptionForm:{success:null,errors:{}},aboutIntechopen:{},privacyPolicy:{},peerReviewing:{},howOpenAccessPublishingWithIntechopenWorks:{},sponsorshipBooks:{sponsorshipBooks:[],offset:8,limit:8,total:0},allSeries:{pteSeriesList:[{id:"14",title:"Artificial Intelligence",numberOfPublishedBooks:9,numberOfPublishedChapters:87,numberOfOpenTopics:6,numberOfUpcomingTopics:0,issn:"2633-1403",doi:"10.5772/intechopen.79920",isOpenForSubmission:!0},{id:"7",title:"Biomedical Engineering",numberOfPublishedBooks:12,numberOfPublishedChapters:98,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2631-5343",doi:"10.5772/intechopen.71985",isOpenForSubmission:!0}],lsSeriesList:[{id:"11",title:"Biochemistry",numberOfPublishedBooks:27,numberOfPublishedChapters:287,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2632-0983",doi:"10.5772/intechopen.72877",isOpenForSubmission:!0},{id:"25",title:"Environmental Sciences",numberOfPublishedBooks:1,numberOfPublishedChapters:9,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2754-6713",doi:"10.5772/intechopen.100362",isOpenForSubmission:!0},{id:"10",title:"Physiology",numberOfPublishedBooks:11,numberOfPublishedChapters:139,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2631-8261",doi:"10.5772/intechopen.72796",isOpenForSubmission:!0}],hsSeriesList:[{id:"3",title:"Dentistry",numberOfPublishedBooks:8,numberOfPublishedChapters:129,numberOfOpenTopics:0,numberOfUpcomingTopics:2,issn:"2631-6218",doi:"10.5772/intechopen.71199",isOpenForSubmission:!1},{id:"6",title:"Infectious Diseases",numberOfPublishedBooks:13,numberOfPublishedChapters:107,numberOfOpenTopics:3,numberOfUpcomingTopics:1,issn:"2631-6188",doi:"10.5772/intechopen.71852",isOpenForSubmission:!0},{id:"13",title:"Veterinary Medicine and Science",numberOfPublishedBooks:10,numberOfPublishedChapters:103,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2632-0517",doi:"10.5772/intechopen.73681",isOpenForSubmission:!0}],sshSeriesList:[{id:"22",title:"Business, Management and Economics",numberOfPublishedBooks:1,numberOfPublishedChapters:12,numberOfOpenTopics:2,numberOfUpcomingTopics:1,issn:null,doi:"10.5772/intechopen.100359",isOpenForSubmission:!0},{id:"23",title:"Education and Human Development",numberOfPublishedBooks:0,numberOfPublishedChapters:0,numberOfOpenTopics:2,numberOfUpcomingTopics:0,issn:null,doi:"10.5772/intechopen.100360",isOpenForSubmission:!1},{id:"24",title:"Sustainable Development",numberOfPublishedBooks:0,numberOfPublishedChapters:10,numberOfOpenTopics:4,numberOfUpcomingTopics:1,issn:null,doi:"10.5772/intechopen.100361",isOpenForSubmission:!0}],testimonialsList:[{id:"13",text:"The collaboration with and support of the technical staff of IntechOpen is fantastic. 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Patil Medical College and Director, Centre for Advanced Medical Research (CAMR), BLDE (Deemed to be University), Vijayapur, Karnataka, India. Dr. Das did his M.S. and Ph.D. in Human Physiology from the University of Calcutta, Kolkata. His area of research is focused on understanding of molecular mechanisms of heavy metal activated low oxygen sensing pathways in vascular pathophysiology. He has invented a new method of estimation of serum vitamin E. His expertise in critical experimental protocols on vascular functions in experimental animals was well documented by his quality of publications. He was a Visiting Professor of Medicine at University of Leeds, United Kingdom (2014-2016) and Tulane University, New Orleans, USA (2017). For his immense contribution in medical research Ministry of Science and Technology, Government of India conferred him 'G.P. Chatterjee Memorial Research Prize-2019” and he is also the recipient of 'Dr.Raja Ramanna State Scientist Award 2015” by Government of Karnataka. He is a Fellow of the Royal Society of Biology (FRSB), London and Honorary Fellow of Karnataka Science and Technology Academy, Department of Science and Technology, Government of Karnataka.",institutionString:"BLDE (Deemed to be University), India",institution:null},{id:"243660",title:"Dr.",name:"Mallanagouda Shivanagouda",middleName:null,surname:"Biradar",slug:"mallanagouda-shivanagouda-biradar",fullName:"Mallanagouda Shivanagouda Biradar",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/243660/images/system/243660.jpeg",biography:"M. S. Biradar is Vice Chancellor and Professor of Medicine of\nBLDE (Deemed to be University), Vijayapura, Karnataka, India.\nHe obtained his MD with a gold medal in General Medicine and\nhas devoted himself to medical teaching, research, and administrations. He has also immensely contributed to medical research\non vascular medicine, which is reflected by his numerous publications including books and book chapters. Professor Biradar was\nalso Visiting Professor at Tulane University School of Medicine, New Orleans, USA.",institutionString:"BLDE (Deemed to be University)",institution:{name:"BLDE University",country:{name:"India"}}},{id:"289796",title:"Dr.",name:"Swastika",middleName:null,surname:"Das",slug:"swastika-das",fullName:"Swastika Das",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/289796/images/system/289796.jpeg",biography:"Swastika N. Das is Professor of Chemistry at the V. P. Dr. P. G.\nHalakatti College of Engineering and Technology, BLDE (Deemed\nto be University), Vijayapura, Karnataka, India. She obtained an\nMSc, MPhil, and PhD in Chemistry from Sambalpur University,\nOdisha, India. Her areas of research interest are medicinal chemistry, chemical kinetics, and free radical chemistry. She is a member\nof the investigators who invented a new modified method of estimation of serum vitamin E. She has authored numerous publications including book\nchapters and is a mentor of doctoral curriculum at her university.",institutionString:"BLDEA’s V.P.Dr.P.G.Halakatti College of Engineering & Technology",institution:{name:"BLDE University",country:{name:"India"}}},{id:"248459",title:"Dr.",name:"Akikazu",middleName:null,surname:"Takada",slug:"akikazu-takada",fullName:"Akikazu Takada",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/248459/images/system/248459.png",biography:"Akikazu Takada was born in Japan, 1935. After graduation from\nKeio University School of Medicine and finishing his post-graduate studies, he worked at Roswell Park Memorial Institute NY,\nUSA. He then took a professorship at Hamamatsu University\nSchool of Medicine. In thrombosis studies, he found the SK\npotentiator that enhances plasminogen activation by streptokinase. He is very much interested in simultaneous measurements\nof fatty acids, amino acids, and tryptophan degradation products. By using fatty\nacid analyses, he indicated that plasma levels of trans-fatty acids of old men were\nfar higher in the US than Japanese men. . He also showed that eicosapentaenoic acid\n(EPA) and docosahexaenoic acid (DHA) levels are higher, and arachidonic acid\nlevels are lower in Japanese than US people. By using simultaneous LC/MS analyses\nof plasma levels of tryptophan metabolites, he recently found that plasma levels of\nserotonin, kynurenine, or 5-HIAA were higher in patients of mono- and bipolar\ndepression, which are significantly different from observations reported before. In\nview of recent reports that plasma tryptophan metabolites are mainly produced by\nmicrobiota. He is now working on the relationships between microbiota and depression or autism.",institutionString:"Hamamatsu University School of Medicine",institution:{name:"Hamamatsu University School of Medicine",country:{name:"Japan"}}},{id:"137240",title:"Prof.",name:"Mohammed",middleName:null,surname:"Khalid",slug:"mohammed-khalid",fullName:"Mohammed Khalid",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/137240/images/system/137240.png",biography:"Mohammed Khalid received his B.S. degree in chemistry in 2000 and Ph.D. degree in physical chemistry in 2007 from the University of Khartoum, Sudan. He moved to School of Chemistry, Faculty of Science, University of Sydney, Australia in 2009 and joined Dr. Ron Clarke as a postdoctoral fellow where he worked on the interaction of ATP with the phosphoenzyme of the Na+/K+-ATPase and dual mechanisms of allosteric acceleration of the Na+/K+-ATPase by ATP; then he went back to Department of Chemistry, University of Khartoum as an assistant professor, and in 2014 he was promoted as an associate professor. In 2011, he joined the staff of Department of Chemistry at Taif University, Saudi Arabia, where he is currently an assistant professor. His research interests include the following: P-Type ATPase enzyme kinetics and mechanisms, kinetics and mechanisms of redox reactions, autocatalytic reactions, computational enzyme kinetics, allosteric acceleration of P-type ATPases by ATP, exploring of allosteric sites of ATPases, and interaction of ATP with ATPases located in cell membranes.",institutionString:"Taif University",institution:{name:"Taif University",country:{name:"Saudi Arabia"}}},{id:"63810",title:"Prof.",name:"Jorge",middleName:null,surname:"Morales-Montor",slug:"jorge-morales-montor",fullName:"Jorge Morales-Montor",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/63810/images/system/63810.png",biography:"Dr. Jorge Morales-Montor was recognized with the Lola and Igo Flisser PUIS Award for best graduate thesis at the national level in the field of parasitology. He received a fellowship from the Fogarty Foundation to perform postdoctoral research stay at the University of Georgia. He has 153 journal articles to his credit. He has also edited several books and published more than fifty-five book chapters. He is a member of the Mexican Academy of Sciences, Latin American Academy of Sciences, and the National Academy of Medicine. He has received more than thirty-five awards and has supervised numerous bachelor’s, master’s, and Ph.D. students. Dr. Morales-Montor is the past president of the Mexican Society of Parasitology.",institutionString:"National Autonomous University of Mexico",institution:{name:"National Autonomous University of Mexico",country:{name:"Mexico"}}},{id:"217215",title:"Dr.",name:"Palash",middleName:null,surname:"Mandal",slug:"palash-mandal",fullName:"Palash Mandal",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/217215/images/system/217215.jpeg",biography:null,institutionString:"Charusat University",institution:null},{id:"49739",title:"Dr.",name:"Leszek",middleName:null,surname:"Szablewski",slug:"leszek-szablewski",fullName:"Leszek Szablewski",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/49739/images/system/49739.jpg",biography:"Leszek Szablewski is a professor of medical sciences. He received his M.S. in the Faculty of Biology from the University of Warsaw and his PhD degree from the Institute of Experimental Biology Polish Academy of Sciences. He habilitated in the Medical University of Warsaw, and he obtained his degree of Professor from the President of Poland. Professor Szablewski is the Head of Chair and Department of General Biology and Parasitology, Medical University of Warsaw. Professor Szablewski has published over 80 peer-reviewed papers in journals such as Journal of Alzheimer’s Disease, Biochim. Biophys. Acta Reviews of Cancer, Biol. Chem., J. Biomed. Sci., and Diabetes/Metabol. Res. Rev, Endocrine. He is the author of two books and four book chapters. He has edited four books, written 15 scripts for students, is the ad hoc reviewer of over 30 peer-reviewed journals, and editorial member of peer-reviewed journals. Prof. Szablewski’s research focuses on cell physiology, genetics, and pathophysiology. He works on the damage caused by lack of glucose homeostasis and changes in the expression and/or function of glucose transporters due to various diseases. He has given lectures, seminars, and exercises for students at the Medical University.",institutionString:"Medical University of Warsaw",institution:{name:"Medical University of Warsaw",country:{name:"Poland"}}},{id:"173123",title:"Dr.",name:"Maitham",middleName:null,surname:"Khajah",slug:"maitham-khajah",fullName:"Maitham Khajah",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/173123/images/system/173123.jpeg",biography:"Dr. Maitham A. Khajah received his degree in Pharmacy from Faculty of Pharmacy, Kuwait University, in 2003 and obtained his PhD degree in December 2009 from the University of Calgary, Canada (Gastrointestinal Science and Immunology). Since January 2010 he has been assistant professor in Kuwait University, Faculty of Pharmacy, Department of Pharmacology and Therapeutics. His research interest are molecular targets for the treatment of inflammatory bowel disease (IBD) and the mechanisms responsible for immune cell chemotaxis. He cosupervised many students for the MSc Molecular Biology Program, College of Graduate Studies, Kuwait University. Ever since joining Kuwait University in 2010, he got various grants as PI and Co-I. He was awarded the Best Young Researcher Award by Kuwait University, Research Sector, for the Year 2013–2014. He was a member in the organizing committee for three conferences organized by Kuwait University, Faculty of Pharmacy, as cochair and a member in the scientific committee (the 3rd, 4th, and 5th Kuwait International Pharmacy Conference).",institutionString:"Kuwait University",institution:{name:"Kuwait University",country:{name:"Kuwait"}}},{id:"195136",title:"Dr.",name:"Aya",middleName:null,surname:"Adel",slug:"aya-adel",fullName:"Aya Adel",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/195136/images/system/195136.jpg",biography:"Dr. Adel works as an Assistant Lecturer in the unit of Phoniatrics, Department of Otolaryngology, Ain Shams University in Cairo, Egypt. Dr. Adel is especially interested in joint attention and its impairment in autism spectrum disorder",institutionString:"Ain Shams University",institution:{name:"Ain Shams University",country:{name:"Egypt"}}},{id:"94911",title:"Dr.",name:"Boulenouar",middleName:null,surname:"Mesraoua",slug:"boulenouar-mesraoua",fullName:"Boulenouar Mesraoua",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/94911/images/system/94911.png",biography:"Dr Boulenouar Mesraoua is the Associate Professor of Clinical Neurology at Weill Cornell Medical College-Qatar and a Consultant Neurologist at Hamad Medical Corporation at the Neuroscience Department; He graduated as a Medical Doctor from the University of Oran, Algeria; he then moved to Belgium, the City of Liege, for a Residency in Internal Medicine and Neurology at Liege University; after getting the Belgian Board of Neurology (with high marks), he went to the National Hospital for Nervous Diseases, Queen Square, London, United Kingdom for a fellowship in Clinical Neurophysiology, under Pr Willison ; Dr Mesraoua had also further training in Epilepsy and Continuous EEG Monitoring for two years (from 2001-2003) in the Neurophysiology department of Zurich University, Switzerland, under late Pr Hans Gregor Wieser ,an internationally known epileptologist expert. \n\nDr B. Mesraoua is the Director of the Neurology Fellowship Program at the Neurology Section and an active member of the newly created Comprehensive Epilepsy Program at Hamad General Hospital, Doha, Qatar; he is also Assistant Director of the Residency Program at the Qatar Medical School. \nDr B. Mesraoua's main interests are Epilepsy, Multiple Sclerosis, and Clinical Neurology; He is the Chairman and the Organizer of the well known Qatar Epilepsy Symposium, he is running yearly for the past 14 years and which is considered a landmark in the Gulf region; He has also started last year , together with other epileptologists from Qatar, the region and elsewhere, a yearly International Epilepsy School Course, which was attended by many neurologists from the Area.\n\nInternationally, Dr Mesraoua is an active and elected member of the Commission on Eastern Mediterranean Region (EMR ) , a regional branch of the International League Against Epilepsy (ILAE), where he represents the Middle East and North Africa(MENA ) and where he holds the position of chief of the Epilepsy Epidemiology Section; Dr Mesraoua is a member of the American Academy of Neurology, the Europeen Academy of Neurology and the American Epilepsy Society.\n\nDr Mesraoua's main objectives are to encourage frequent gathering of the epileptologists/neurologists from the MENA region and the rest of the world, promote Epilepsy Teaching in the MENA Region, and encourage multicenter studies involving neurologists and epileptologists in the MENA region, particularly epilepsy epidemiological studies. \n\nDr. Mesraoua is the recipient of two research Grants, as the Lead Principal Investigator (750.000 USD and 250.000 USD) from the Qatar National Research Fund (QNRF) and the Hamad Hospital Internal Research Grant (IRGC), on the following topics : “Continuous EEG Monitoring in the ICU “ and on “Alpha-lactoalbumin , proof of concept in the treatment of epilepsy” .Dr Mesraoua is a reviewer for the journal \"seizures\" (Europeen Epilepsy Journal ) as well as dove journals ; Dr Mesraoua is the author and co-author of many peer reviewed publications and four book chapters in the field of Epilepsy and Clinical Neurology",institutionString:"Weill Cornell Medical College in Qatar",institution:{name:"Weill Cornell Medical College in Qatar",country:{name:"Qatar"}}},{id:"282429",title:"Prof.",name:"Covanis",middleName:null,surname:"Athanasios",slug:"covanis-athanasios",fullName:"Covanis Athanasios",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/282429/images/system/282429.jpg",biography:null,institutionString:"Neurology-Neurophysiology Department of the Children Hospital Agia Sophia",institution:null},{id:"190980",title:"Prof.",name:"Marwa",middleName:null,surname:"Mahmoud Saleh",slug:"marwa-mahmoud-saleh",fullName:"Marwa Mahmoud Saleh",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/190980/images/system/190980.jpg",biography:"Professor Marwa Mahmoud Saleh is a doctor of medicine and currently works in the unit of Phoniatrics, Department of Otolaryngology, Ain Shams University in Cairo, Egypt. She got her doctoral degree in 1991 and her doctoral thesis was accomplished in the University of Iowa, United States. Her publications covered a multitude of topics as videokymography, cochlear implants, stuttering, and dysphagia. She has lectured Egyptian phonology for many years. Her recent research interest is joint attention in autism.",institutionString:"Ain Shams University",institution:{name:"Ain Shams University",country:{name:"Egypt"}}},{id:"259190",title:"Dr.",name:"Syed Ali Raza",middleName:null,surname:"Naqvi",slug:"syed-ali-raza-naqvi",fullName:"Syed Ali Raza Naqvi",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/259190/images/system/259190.png",biography:"Dr. Naqvi is a radioanalytical chemist and is working as an associate professor of analytical chemistry in the Department of Chemistry, Government College University, Faisalabad, Pakistan. Advance separation techniques, nuclear analytical techniques and radiopharmaceutical analysis are the main courses that he is teaching to graduate and post-graduate students. In the research area, he is focusing on the development of organic- and biomolecule-based radiopharmaceuticals for diagnosis and therapy of infectious and cancerous diseases. Under the supervision of Dr. Naqvi, three students have completed their Ph.D. degrees and 41 students have completed their MS degrees. He has completed three research projects and is currently working on 2 projects entitled “Radiolabeling of fluoroquinolone derivatives for the diagnosis of deep-seated bacterial infections” and “Radiolabeled minigastrin peptides for diagnosis and therapy of NETs”. He has published about 100 research articles in international reputed journals and 7 book chapters. Pakistan Institute of Nuclear Science & Technology (PINSTECH) Islamabad, Punjab Institute of Nuclear Medicine (PINM), Faisalabad and Institute of Nuclear Medicine and Radiology (INOR) Abbottabad are the main collaborating institutes.",institutionString:"Government College University",institution:{name:"Government College University, Faisalabad",country:{name:"Pakistan"}}},{id:"58390",title:"Dr.",name:"Gyula",middleName:null,surname:"Mozsik",slug:"gyula-mozsik",fullName:"Gyula Mozsik",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/58390/images/system/58390.png",biography:"Gyula Mózsik MD, Ph.D., ScD (med), is an emeritus professor of Medicine at the First Department of Medicine, Univesity of Pécs, Hungary. He was head of this department from 1993 to 2003. His specializations are medicine, gastroenterology, clinical pharmacology, clinical nutrition, and dietetics. His research fields are biochemical pharmacological examinations in the human gastrointestinal (GI) mucosa, mechanisms of retinoids, drugs, capsaicin-sensitive afferent nerves, and innovative pharmacological, pharmaceutical, and nutritional (dietary) research in humans. He has published about 360 peer-reviewed papers, 197 book chapters, 692 abstracts, 19 monographs, and has edited 37 books. He has given about 1120 regular and review lectures. He has organized thirty-eight national and international congresses and symposia. He is the founder of the International Conference on Ulcer Research (ICUR); International Union of Pharmacology, Gastrointestinal Section (IUPHAR-GI); Brain-Gut Society symposiums, and gastrointestinal cytoprotective symposiums. He received the Andre Robert Award from IUPHAR-GI in 2014. Fifteen of his students have been appointed as full professors in Egypt, Cuba, and Hungary.",institutionString:"University of Pécs",institution:{name:"University of Pecs",country:{name:"Hungary"}}},{id:"277367",title:"M.Sc.",name:"Daniel",middleName:"Martin",surname:"Márquez López",slug:"daniel-marquez-lopez",fullName:"Daniel Márquez López",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/277367/images/7909_n.jpg",biography:"Msc Daniel Martin Márquez López has a bachelor degree in Industrial Chemical Engineering, a Master of science degree in the same área and he is a PhD candidate for the Instituto Politécnico Nacional. His Works are realted to the Green chemistry field, biolubricants, biodiesel, transesterification reactions for biodiesel production and the manipulation of oils for therapeutic purposes.",institutionString:null,institution:{name:"Instituto Politécnico Nacional",country:{name:"Mexico"}}},{id:"196544",title:"Prof.",name:"Angel",middleName:null,surname:"Catala",slug:"angel-catala",fullName:"Angel Catala",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/196544/images/system/196544.jpg",biography:"Angel Catalá studied chemistry at Universidad Nacional de La Plata, Argentina, where he received a Ph.D. in Chemistry (Biological Branch) in 1965. From 1964 to 1974, he worked as an Assistant in Biochemistry at the School of Medicine at the same university. From 1974 to 1976, he was a fellow of the National Institutes of Health (NIH) at the University of Connecticut, Health Center, USA. From 1985 to 2004, he served as a Full Professor of Biochemistry at the Universidad Nacional de La Plata. He is a member of the National Research Council (CONICET), Argentina, and the Argentine Society for Biochemistry and Molecular Biology (SAIB). His laboratory has been interested for many years in the lipid peroxidation of biological membranes from various tissues and different species. Dr. Catalá has directed twelve doctoral theses, published more than 100 papers in peer-reviewed journals, several chapters in books, and edited twelve books. He received awards at the 40th International Conference Biochemistry of Lipids 1999 in Dijon, France. He is the winner of the Bimbo Pan-American Nutrition, Food Science and Technology Award 2006 and 2012, South America, Human Nutrition, Professional Category. In 2006, he won the Bernardo Houssay award in pharmacology, in recognition of his meritorious works of research. Dr. Catalá belongs to the editorial board of several journals including Journal of Lipids; International Review of Biophysical Chemistry; Frontiers in Membrane Physiology and Biophysics; World Journal of Experimental Medicine and Biochemistry Research International; World Journal of Biological Chemistry, Diabetes, and the Pancreas; International Journal of Chronic Diseases & Therapy; and International Journal of Nutrition. He is the co-editor of The Open Biology Journal and associate editor for Oxidative Medicine and Cellular Longevity.",institutionString:"Universidad Nacional de La Plata",institution:{name:"National University of La Plata",country:{name:"Argentina"}}},{id:"186585",title:"Dr.",name:"Francisco Javier",middleName:null,surname:"Martin-Romero",slug:"francisco-javier-martin-romero",fullName:"Francisco Javier Martin-Romero",position:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bSB3HQAW/Profile_Picture_1631258137641",biography:"Francisco Javier Martín-Romero (Javier) is a Professor of Biochemistry and Molecular Biology at the University of Extremadura, Spain. He is also a group leader at the Biomarkers Institute of Molecular Pathology. Javier received his Ph.D. in 1998 in Biochemistry and Biophysics. At the National Cancer Institute (National Institute of Health, Bethesda, MD) he worked as a research associate on the molecular biology of selenium and its role in health and disease. After postdoctoral collaborations with Carlos Gutierrez-Merino (University of Extremadura, Spain) and Dario Alessi (University of Dundee, UK), he established his own laboratory in 2008. The interest of Javier's lab is the study of cell signaling with a special focus on Ca2+ signaling, and how Ca2+ transport modulates the cytoskeleton, migration, differentiation, cell death, etc. He is especially interested in the study of Ca2+ channels, and the role of STIM1 in the initiation of pathological events.",institutionString:null,institution:{name:"University of Extremadura",country:{name:"Spain"}}},{id:"217323",title:"Prof.",name:"Guang-Jer",middleName:null,surname:"Wu",slug:"guang-jer-wu",fullName:"Guang-Jer Wu",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/217323/images/8027_n.jpg",biography:null,institutionString:null,institution:null},{id:"148546",title:"Dr.",name:"Norma Francenia",middleName:null,surname:"Santos-Sánchez",slug:"norma-francenia-santos-sanchez",fullName:"Norma Francenia Santos-Sánchez",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/148546/images/4640_n.jpg",biography:null,institutionString:null,institution:null},{id:"272889",title:"Dr.",name:"Narendra",middleName:null,surname:"Maddu",slug:"narendra-maddu",fullName:"Narendra Maddu",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/272889/images/10758_n.jpg",biography:null,institutionString:null,institution:null},{id:"242491",title:"Prof.",name:"Angelica",middleName:null,surname:"Rueda",slug:"angelica-rueda",fullName:"Angelica Rueda",position:"Investigador Cinvestav 3B",profilePictureURL:"https://mts.intechopen.com/storage/users/242491/images/6765_n.jpg",biography:null,institutionString:null,institution:null},{id:"88631",title:"Dr.",name:"Ivan",middleName:null,surname:"Petyaev",slug:"ivan-petyaev",fullName:"Ivan Petyaev",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Lycotec (United Kingdom)",country:{name:"United Kingdom"}}},{id:"423869",title:"Ms.",name:"Smita",middleName:null,surname:"Rai",slug:"smita-rai",fullName:"Smita Rai",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Integral University",country:{name:"India"}}},{id:"424024",title:"Prof.",name:"Swati",middleName:null,surname:"Sharma",slug:"swati-sharma",fullName:"Swati Sharma",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Integral University",country:{name:"India"}}},{id:"439112",title:"MSc.",name:"Touseef",middleName:null,surname:"Fatima",slug:"touseef-fatima",fullName:"Touseef Fatima",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Integral University",country:{name:"India"}}},{id:"424836",title:"Dr.",name:"Orsolya",middleName:null,surname:"Borsai",slug:"orsolya-borsai",fullName:"Orsolya Borsai",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca",country:{name:"Romania"}}},{id:"422262",title:"Ph.D.",name:"Paola Andrea",middleName:null,surname:"Palmeros-Suárez",slug:"paola-andrea-palmeros-suarez",fullName:"Paola Andrea Palmeros-Suárez",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"University of Guadalajara",country:{name:"Mexico"}}}]}},subseries:{item:{id:"12",type:"subseries",title:"Human Physiology",keywords:"Anatomy, Cells, Organs, Systems, Homeostasis, Functions",scope:"Human physiology is the scientific exploration of the various functions (physical, biochemical, and mechanical properties) of humans, their organs, and their constituent cells. The endocrine and nervous systems play important roles in maintaining homeostasis in the human body. Integration, which is the biological basis of physiology, is achieved through communication between the many overlapping functions of the human body's systems, which takes place through electrical and chemical means. Much of the basis of our knowledge of human physiology has been provided by animal experiments. Because of the close relationship between structure and function, studies in human physiology and anatomy seek to understand the mechanisms that help the human body function. The series on human physiology deals with the various mechanisms of interaction between the various organs, nerves, and cells in the human body.",coverUrl:"https://cdn.intechopen.com/series_topics/covers/12.jpg",hasOnlineFirst:!0,hasPublishedBooks:!0,annualVolume:11408,editor:{id:"195829",title:"Prof.",name:"Kunihiro",middleName:null,surname:"Sakuma",slug:"kunihiro-sakuma",fullName:"Kunihiro Sakuma",profilePictureURL:"https://mts.intechopen.com/storage/users/195829/images/system/195829.jpg",biography:"Professor Kunihiro Sakuma, Ph.D., currently works in the Institute for Liberal Arts at the Tokyo Institute of Technology. He is a physiologist working in the field of skeletal muscle. He was awarded his sports science diploma in 1995 by the University of Tsukuba and began his scientific work at the Department of Physiology, Aichi Human Service Center, focusing on the molecular mechanism of congenital muscular dystrophy and normal muscle regeneration. His interest later turned to the molecular mechanism and attenuating strategy of sarcopenia (age-related muscle atrophy). His opinion is to attenuate sarcopenia by improving autophagic defects using nutrient- and pharmaceutical-based treatments.",institutionString:null,institution:{name:"Tokyo Institute of Technology",institutionURL:null,country:{name:"Japan"}}},editorTwo:null,editorThree:{id:"331519",title:"Dr.",name:"Kotomi",middleName:null,surname:"Sakai",slug:"kotomi-sakai",fullName:"Kotomi Sakai",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0033Y000031QtFXQA0/Profile_Picture_1637053227318",biography:"Senior researcher Kotomi Sakai, Ph.D., MPH, works at the Research Organization of Science and Technology in Ritsumeikan University. She is a researcher in the geriatric rehabilitation and public health field. She received Ph.D. from Nihon University and MPH from St.Luke’s International University. 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