\r\n\tWith a history of over 50 years since their introduction into therapy and formulation of medicinal products, hydrogels remain a challenge for researchers in the field. \r\n\tVersatile, with high-water content, tunable properties, and mild processing conditions, hydrogels advanced from simple chemically or physically crosslinked networks to complex double network composites or even more sophisticated new developments as shape memory and self-healing hydrogels. \r\n\tIncreasing knowledge in hybrid or composite hydrogel materials, controlled release of sensitive drugs, or several drugs from the same hydrogel matrix could be achieved. Parallel to targeted efforts aimed to maintain drug micro- or nanoparticle’s distinct three-dimensional structure, synergistic hybrid materials with more than one type of polymer was developed.
\r\n
\r\n\tBut one of the most challenging tasks remains further and continues to improve the clinical translation of these innovative hydrogels. That is what this book intends to provide the reader: a comprehensive overview of the current state-of-the-art, recent advances, new perspectives, and applications of the hydrogels as valuable platforms for targeted delivery. Driven by the need to ensure proper patient compliance, ease of administration, along with the possibility to modulate release and degradation profiles after administration, numerous non-topical hydrogel formulations had been reported. Smart and supramolecular hydrogels, stimuli-reactive materials, that quickly respond in mild conditions, represent today an attractive approach for minimally invasive treatments.
\r\n
\r\n\tThe book will also represent an invitation to discover “new” off-the-shelf hydrogels with highly tunable properties, with low complexity of formulation (environmentally friendly processing), but with adequate features to fulfill clinical requirements and provide desired delivery platforms for therapy.
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Professor POPA LĂCRĂMIOARA (h-index 14) received her Ph.D. in Pharmacy (2000). She has over 28 years of experience in physical pharmacy: Quality by Design (QbD) in the development, analysis, and optimization of pharmaceutical systems; characterization of the raw materials surfaces and pharmaceutical systems; polymeric materials with biomedical applications.",coeditorOneBiosketch:"A pioneering researcher in Taguchi's approach for the development and optimization of biomaterial-based drug delivery systems. Professor Mihaela Violeta Ghica (h-index 16) has over 19 years ‘experience in physical pharmacy: modern methods of experimental statistical design in the development of drug delivery systems and technological processes optimization; biomaterials for tissue regeneration: obtaining, physical-chemical, biopharmaceutical, structural and morphological characterization.",coeditorTwoBiosketch:"A pioneering researcher in nanostructures formulation in pharmaceutical sciences. Professor Cristina-Elena Dinu-Pîrvu (h-index 15) is a member of the Romanian National Council for the Attestation of University Titles, Diplomas, and Certificates–Commission Pharmacy. She has over 28 years of experience in physical pharmacy: development of smart, efficient, and safe biocompatible materials; development of bio- and nanostructures for diagnostic and therapy.",coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"228211",title:"Prof.",name:"Lacramioara",middleName:null,surname:"Popa",slug:"lacramioara-popa",fullName:"Lacramioara Popa",profilePictureURL:"https://mts.intechopen.com/storage/users/228211/images/system/228211.jpeg",biography:"Professor POPA LĂCRĂMIOARA received her PhD in Pharmacy (2000). She is head of Physical and Colloidal Chemistry Department, Faculty of Pharmacy, 'Carol Davila” University of Medicine and Pharmacy from Bucharest, Romania and President of the Ethics and Quality Assurance Commission from the same faculty. She is PhD supervisor (Habilitation thesis, 2014). Professor Popa Lăcrămioara graduated several courses in Intellectual Property (WIPO Academy, Geneva). She has over 28 years’ experience in physical pharmacy: Quality by Design (QbD) in the development, analysis, and optimization of pharmaceutical systems; characterization of the raw materials surfaces and pharmaceutical systems; polymeric materials with biomedical applications. 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She holds a Master’s degree in Physical Chemistry and Applied Radiochemistry at the Faculty of Chemistry from University of Bucharest.\nShe has over 17 years of experience in: design, development, physico-chemical and biopharmaceutical evaluation of drug delivery systems with conventional/modified/ controlled/targeted release for topical application; use of statistic experimental design techniques combined with response surface methodology and Taguchi approach for the optimization of the pharmaceutical systems formulation and some technological processes; valorisation of the biopharmacological potential of the medicinal and aromatic plants. Professor Mihaela Violeta Ghica was project director and partner responsible for some national and international projects. 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1. Introduction
Electrochemical methods have been used for studying clay minerals to a limited extent in comparison with X-ray diffraction, infrared spectroscopy, thermal analysis etc. However, so called “clay electrodes” have become individual and indisputable part of electrochemistry [1 - 8] since the first electrode modified with clay mineral was described in 1983 [1]. Voltammetry on clay electrodes has found its role in the research of clay minerals and their properties, especially ion-exchange and sorption. A thin layer of inorganic material – clay mineral – on the electrode surface does not possess the significant isolating properties thus charge transport proceeds on the clay electrode. The electrode covered with the clay mineral film enables to study the electrode processes and surfaces. By means of the standard electrochemical methods, transport of charge through the clay layer, the sorption and ion-exchange processes in the clay minerals structure can be studied, too. Accumulation of the electroactive compounds into the clay mineral can be successfully used in electroanalysis [7, 9].
Possibilities of electrochemistry in the study of clay minerals by the clay modified electrodes have been in detail stated in the reviews of A. Fitch and her colleagues [3 - 5]. Very interesting opinion concerning the clay mineral structure is presented in the work dealing with study of flow and transport of compounds through the clay film [5]. The clay structure due to its layers charge forms an electrically charged interphase clay – liquid, thus electric double-layer exists on the surface of the clay minerals particles. The processes taking place in the double-layer are considered to be analogous to those in the interphase electrode – solution. The transport mechanisms in the charged media can be studied by the similar way – for example electroosmosis, electromigration or conductivity. These phenomena study has a practical significance in the electrochemical renewal of the soils contaminated with metals [5], for example the technology for elimination of As, Cu, Cd, Cr, Pb, and Zn from the localities impacted with the dangerous wastes. Of course, the technology is suitable in the case of the metals ions able to participate in the ions reactions and to migrate. An advantage of the electrochemical removing of metals consists in the low financial costs and the insignificant environmental impact in comparison with the technologies based on extraction vaporization or exhaustion.
Cyclic voltammetry on the clay modified electrodes has been used to study the sorption properties of clay minerals. Repetitive (multisweep) cyclic voltammetry on the clay modified electrode exhibited dependences similar to the sorption isotherms [8]. A consecutive occupation of the ion-exchange sites in the structure of clay mineral by an appropriate compound results in a potential shift in comparison with the unmodified electrode. With increasing concentration of sorbate the potential shift exhibits curves in the shape of the sorption isotherms which can be used to evaluation of an extent of the ion-exchange or sorption process. Sorption of metals cations on montmorillonite, vermiculite and kaolinite was studied by means of multisweep cyclic voltammetry on the carbon paste electrodes modified with these clays [10]. Similarly to [8] the current response dependences on the cycling time exhibited the same course as the sorption isotherms. The dependences enable to distinguish an extent of sorption of the individual cation and an ability of clay mineral to adsorb the given cation, of course only in the first approximation. For example, the highest sorption of copper was found in the case of montmorillonite, which was used for determination of Cu[11]. The current vs. time dependences obtained by multisweep cyclic voltammetry on the montmorillonite modified carbon paste electrodes were used for determination of the Cu(II) adsorption kinetics [12]. Adsorption of Cu(II) on the various types of montmorillonite was found to be in accordance with the second order model, the experimental values of the maximum current correlate to those calculated from the supposed equation of the kinetics. Cation exchange of Ag(I) and Ca(II) studied on the carbon paste electrode modified with vermiculite showed to be a dominant process of the cations sorption; the simplified model was worked out and equilibrium constant of the Ag(I) ion exchange was determined [13]. The equilibrium constant value was in a good agreement with the constant determined by other method.
In spite of the lower anion exchange capacity of clay minerals in comparison with the cation exchange capacity the exchange of the complex anions [Hg(ac)4]2-, [HgCl4]2-, and [HgCl3]- (ac – acetate) was proved on the carbon paste electrodes modified with montmorillonite and vermiculite [14] and it was used for determination of Hg [15]. The same mechanism was found in the case of [Au(Cl)4]- on the montmorillonite modified carbon paste electrode [16], which was also used in the electroanalysis [16, 17]. The lower anion exchange ability of clay minerals is caused by presence of the negative charge of layer. It is supposed, that the anion forms of compounds are “repelled” and they are not gripped in the interlayer [4]. A suitable chemical modification of clay minerals can enhance their affinity to anions. This so called “tunning charge selectivity” has been applied in the field of clay electrodes [18]. For example, smectite with bound propylamine groups exhibited the higher ability to accumulate anion [Fe(CN)6]3- due to protonization of amine groups. The originally cation-exchange smectite was “tunned” to anion-exchange.
Clay minerals represent the significant natural matrix in the soil medium, which participate in many geochemical processes both natural and those connected with transport and behaviour of the anthropogenic compounds in the soils. Interactions of clay minerals with metal and organic compounds influence their activity, transport, and biological availability. The electrodes modified with clay minerals can serve as a model suitable to study some soil processes connected with clay minerals. The carbon paste electrode modified with vermiculite was used as a model of soil fraction to study the binding interactions of Cu(II) with vermiculite [19]. The selected pesticides and their influence on sorption of Cu(II) on vermiculite were studied. The noncomplexing ligands such as fenamiphos, fenmedipham, and atrazine did not exhibited any influence on the Cu(II) ions sorption. The compounds such as desethylatrazine, desizopropylatrazine, and desethyldesizopropylatrazine do not bind on vermiculite, but they decrease the Cu(II) sorption due to formation the coordination compounds with Cu(II). Apart from the determination of these influences on the metal sorption on clay mineral kinetic and thermodynamic aspects of the sorption processes can be characterized by this way. A soil organo-clay complex – clay humate – is formed by interaction of natural organic matter based on humic and fulvic acids with the clay particles surfaces. The humic adsorbates significantly change properties of clay minerals which influenced their reactions with both natural and anthropogenic substances. The carbon paste electrode modified with the prepared clay humates was used for characterization of the clay minerals reactions with Cu(II) in comparison with the origin clay minerals [20]. Cyclic voltammetry on these electrodes distinguished various types of the clay humates, the obtained results were proved by X-ray diffraction study of the clay humate structures.
Organo-clay modified electrodes represent a new type of clay modified electrodes similar to those with clays grafted with the suitable organic function groups [18, 21, 22]. Similarly as the above mentioned “tunning charge selectivity”, cation-exchange ability of clay can be changed to anion-exchange ability due to the cationic surfactants adsorbed onto the clay structure [23]. Clay minerals intercalated with alkylammonium cations (cationic surfactants) exhibit the higher affinity to organic compounds. For example, montmorillonite intercalated with hexadecyltrimethylammonium as a modifier in the carbon paste electrode was able to adsorb pesticides isoproturon, carbendiazim, and methyl parathion [24], which showed to be suitable for stripping voltammetric determination of these pesticides in soil and water. Preconcentration of phenol on glassy carbon electrode modified with film of hydrotalcite-like clay containing surfactant sodium octyl sulfate, sodium dodecyl sulfate, or sodium dodecylbenzenesulfonate [25] as well as octylphenoxypolyethoxyethanol or cetylpyridinium bromide [26] was studied. The electrodes exhibited good sensitivity and reproducibility of phenol determination [25]. Carbon paste electrode modified with montmorillonite exchanged with hexadecyltrimethylammonium bromide was successfully used to determine 4-chlorphenol in water samples [27]. Sorption of Hg, Cd, Pb, Cu, and Znon montmorillonite intercalated with hexadecyltrimethylammonium cations resulted in use of this organo-montmorillonite as a carbon paste modifier [28]. This organo-montmorillonite loaded with 1,3,4-thiadiazole-2,5-dithiol exhibited an excellent selectivity for Hg(II) ions in presence of other ions. The carbon paste electrode modified with these 1,3,4-thiadiazole-2,5-dithiol-organo-montmorillonite provides a selective sensor for the mercury determination.
The examples mentioned above have at least one common denominator: processes are accompanied by changes of charge on or inside materials. The measurement of zeta potential is one of the methods which provide to obtain imagination about character of the particle surface itself and then also about the processes running on this surface (e.g. adsorption, ion exchange, modification). The experiments connected to the zeta potential measuring represent afactor helping to explain the principles of interactions between surface and its surroundings. As an example heavy metals adsorption on clay minerals (heavy metals removing) or surfactant adsorption on carbonaceous materials (flotation of coals) can be mentioned. The zeta potential knowledge can be also applied in the field of oxidative catalysts, pigments, waste slurries, etc. [29 – 31].
Clay minerals are very often characterized by measurement of the zeta potential. One of the most common measurements is monitoring the zeta potential changes with changing the pH value. This monitoring is performed by titration of montmorillonite, illite, and chlorite by hydrochloric acid and sodium hydroxide. The dependence of the zeta potential on pH exhibited a typical form. The acid addition led to increase of the zeta potential, on the contrary increase in pH (addition of base) caused decrease of the zeta potential. The individual clay minerals exhibited differences arising from the structure and chemical composition of the studied samples. The most significant change of pH came up in the case of chlorite and it was also the only one clay mineral where the isoelectric point was determined (pH=5) [32]. Knowledge of the zeta potential value at the given pH is necessary for understanding the processes running on the surfaces.
The adsorption of heavy metals and metal oxides on the surface of clay minerals plays an important role as well. Sorption of iron and aluminium on the surface of illite, montmorillonite and kaolinite led to reduction of the negative charges on the particle surface so that the isoelectric point of these minerals was shifted to the higher values of pH [33].
The zeta potential of zeolites was examined in connection to the sorption of heavy metals on these adsorption materials. Dependence of the zeta potential on pH was influenced by concentration of a bulk electrolyte (NaNO3). As the concentration of NaNO3 was increasing the value of the zeta potential was increasing as well. That fact is explained by change of thickness of double-layer caused by ionic strength of solution. These changes consequently influenced the adsorption of heavy metals (Pb, Cu, Cd, and Zn). The highest adsorption capacity was found in water [34].
The surfactant molecules generally adsorb in the interfaces between two bulk phases such as solid-liquid or electrode-solution [35]. When adsorbing on solid an ionic surfactant exhibits the surface charge. Zeta potential is one of few effective techniques for characterization of the surface charge as well as the surface chemical properties of solids in solution and for understanding the changes on the solid surfaces. The zeta potential values correspond to the quantity and quality of functional groups on the surface [36].
The work deals with use of the montmorillonite modified carbon paste electrodes for studying of the Cu(II) sorption on two types of montmorillonite - montmorillonite SAz-1 and montmorillonite SWy-2 - and their organo-derivatives containing alkylammonium cations - hexadecyltrimethylammonium, benzyldimethylhexadecylammonium, and hexadecylpyridinium. The zeta potential measurement was used to characterize the Cu(II) and hexadecyltrimethylammonium cation sorptionon montmorillonite.
2. Experimental part
2.1. Materials and chemicals
Montmorillonites of two types – montmorillonite SAz-1 (MMT,SAz-1) (Apache County, USA) and montmorillonite SWy-2 – (MMT,SWy-2) (Crook County, USA) were provided from The Clay Minerals Society, Source Clays Repository (USA). The fraction used for all experiments consisted of 80 % of particles below 5 μm (Fritsch Particle Sizer Analysette 22, Fritsch GmbH, Idar-Oberstein, Germany). Another sample of montmorillonite MMT,Wy (deposit Wyoming) was obtained from an older collection of colleagues from Institute of Geonics, CAS Ostrava.
Cation exchange capacity (CEC) was calculated as the sum of cations exchanged with NH4+ ions during leaching per gram of montmorillonite [14]. The CEC values were 56 cmol(+)/kg and 76 cmol(+)/kg for MMT,SAz-1, resp. MMT,SWy-2. Mineralogical characterisation was performed by infrared spectrometry and X-ray diffraction [37]. The montmorillonite samples were classified as pure montmorillonites without any admixture of other minerals including quartz.
Organo-montmorillonites were prepared by intercalation of three alkylammonium cations. Hexadecyltrimethylammonium bromide (HDTMABr) (Sigma-Aldrich), benzyldimethylhexadecylammonium chloride (BDHDACl) (Fluka), and hexadecylpyridinium bromide (HDPBr) (Sigma-Aldrich) of analytical reagent grade were used to prepare the modified montmorillonites MMT,SAz-1–HDTMA, MMT,SAz-1-BDHDA, MMT,SAz-1-HDP), MMT,SWy-2–HDTMA, MMT,SWy-2-BDHDA, MMT,SWy-2-HDP.
Figure 1.
Structures of the used alkylammonium cations
All the chemicals used (sodium acetate and acetic acid for preparation of the background electrolyte as well as sodium hydroxide and hydrochloric acid for measurement of zeta potential) were of analytical grade (Merck, Darmstadt, Germany). The sorption solutions of copper were prepared from Cu(NO3)2 3H2O (Lachema Neratovice). The Cu standard for AAS (Cu) (Fluka) was used for AAS analysis. Stock standard solutions of Cu for voltammetry were prepared from Titrisol standards (Merck, Darmstadt, Germany).
3. Procedures
3.1. Preparation of carbon paste electrodes
Carbon paste electrodes (CPEs) modified with either montmorillonites or their organo-derivatives were prepared by the standard procedure [7]. Flake graphite and paraffin oil (Nujol) were thoroughly mixed; in the case of the modified CPEs, an appropriate amount of modifier was added to the graphite before mixing it with oil. A ratio of graphite or the admixture of graphite–modifier to oil was 2.5. The modifier content in the prepared carbon pastes was 10 %, (w/w). The electrodes modifier was before mixing to the carbon paste previously saturated with water vapour, which ensured that the modifier was sufficiently wet but without excess water. No activation and regeneration of the electrode surface prepared in such a way was necessary. The surface was easily renewed by extruding a very small amount of paste and by polishing it on a plastic sheet or scratchboard.
The following carbon paste electrodes were prepared:
CPE(0) – unmodified carbon paste electrode
CPE(MMT,SAz-1) – carbon paste electrode modified with 10 wt.% (mass %) of montmorillonite SAz-1
CPE(MMT,SAz-1-HDTMA) – carbon paste electrode modified with 10 wt.% (mass %) of HDTMA-montmorillonite SAz-1
CPE(MMT,SAz-1-BDHDA) – carbon paste electrode modified with 10 wt.% (mass %) of BDHDA-montmorillonite SAz-1
CPE(MMT,SAz-1-HDP) – carbon paste electrode modified with 10 wt.% (mass %) of HDP-montmorillonite SAz-1
CPE(MMT,SWy-2) – carbon paste electrode modified with 10wt.% (mass %) of montmorillonite MMT,SWy-2
CPE(MMT,SWy-2-HDTMA) – carbon paste electrode modified with 10 wt.% (mass %) of HDTMA-montmorillonite SWy-2
CPE(MMT,SWy-2-BDHDA) – carbon paste electrode modified with 10 wt.% (mass %) of BDHDA-montmorillonite SWY-2
CPE(MMT,SWy-2-HDP) – carbon paste electrode modified with 10 wt.% (mass %) of HDP-montmorillonite SWy-2
3.2. Cyclic voltammetry
Multisweep cyclic voltammetry (MCV) on the modified CPEs was performed on EKO-TRIBO-Polarograph (EKOTREND, Prague, Czech Republic). A three-electrode cell was equipped with a carbon paste electrode (CPE) (working), an Ag/AgCl (saturated KCl) reference electrode, and a Pt wire auxiliary electrode. MCV at a scan rate of 20 mV s–1 was applied with a potential range from –0.6 V to +0.2 V.
3.3. Sorption of copper
An appropriate amount of montmorillonite or its organo-derivative and a volume of the Cu(II) solution (concentrationsin the range 0,5 – 10 mmol. l-1)was inserted into an Erlenmeyer flask (ratio solid : liquid = 1 : 100). The suspension was shaken at the laboratory temperature for 24 h. The amount of the adsorbed Cu(II) was determined as a difference between its concentration before and after the sorption (equation 2 below).
3.4. Zeta potential measurement
The Coulter Delsa 440 SX (Coulter Electronic, USA) instrument was used to measure the zeta potential. Delsa 440 SX uses the scattering effect of Doppler light to determine the electrophoretic mobility. The zeta potential was obtained from the electrophoretic mobility by the Smoluchowski equation:
ζ=μ.ηεE1
\n\t\t\t\t
ζ is the zeta potential (V), η represents dynamic viscosity (Pa.s), and ε stands for the dielectric constant. The fixed conditions of measuring were the following ones: temperature (298 K), electric field (15 V), frequency (500 Hz), and the properties of the samples – viscosity (0.0089 kg.m-1.s-1), refraction index (1.333), and dielectric constant (78.36). The samples were sonicated for 1 minute before zeta potential analysis. All zeta potential measurements were at least duplicated; the mean relative standard deviation of the values reported usually did not exceed 5 %. All the solutions were made in distilled water. Analytical grade chemicals were used. Zeta potential measurements consisted from three steps.
At first a dependence of zeta potential on pH was measured. An amount of 0.1g montmorillonite MMT,Wy was added to the flask with 50 ml of distilled water. The pH value of each suspension was adjusted by adding either NaOH or HCl; pH of the solution was measured using the combination single-junction pH electrode with Ag/AgCl reference cell (LP Prague, model MS 22 pH meter).
The second and the third step of the zeta potential measurements were in principle the same. The zeta potential changes were monitored after adsorption of Cu(II) and HDTMA on MMT,Wy. The clay fraction with the particle size below 5 μm was used for the adsorption experiments. The clay amount of 0.1 g of was weighed in the flask and 100 ml of the Cu(II) or HDTMA solution of a known concentration was added. The suspensions were inserted into a thermostatic bath (25oC) and flasks were permanently shaken. As it was found in the previous experiments, a 24 hours´ period is needed to reach equilibrium. The zeta potential of the adsorption suspensions was measured. Then, the clay sample was separated by filtration with paper filter.
The amount of Cu(II) and HDTMA adsorbed (a) was determined from the change in the solution concentration before and after equilibrium, according to:
a=(c0−ce)VmE2
\n\t\t\t\t
where c0 is the initial concentration of the HDTMA solution, ce the concentration of the HDTMA solution at the adsorption equilibrium, V the volume of the HDTMA solution and m the mass of the clay.
The HDTMA concentration of the filtered solutions was determined by UV/VIS spectrophotometry (ALS laboratory group, CZ_SOP_D06_07_N03).
3.5. Preparation of organo-montmorillonites
An amount of 1 g of montmorillonite and 100 ml 7.5 mmol. l-1 solution of alkylammonium cation was shaken at the laboratory temperature for 2.5 h (the time was found in the previous experiments). After the sorption the suspension was centrifuged (9000 rev min-1) for 10 min. The supernatant was removed, the solid was washed out with 5 ml solution of ethanol : water = 2 : 1 and the suspension was again centrifuged at the same rate. The washing out was repeated with 5 ml of ethanol and the preparative of organo-montmorillonite was air dried after centrifugation.
3.6. X-ray diffraction
X-Ray diffraction (XRD) was carried out at Nanotechnology Centre, VSB-Technical University Ostrava. XRD patterns of the tested samples were measured by diffractometer INEL equipped with Cu anode, generator (2000 sec, 35 kV, 20 mA) and detector CPSD 120, samples were measured in a flat rotation holder.
3.7. Infrared spectroscopy
Infrared spectra were recorded on Nicolet Avatar 320 FTIR spectrometer (ThermoNicolet, USA) equipped with the DTGS/KBr detector for the middle IR range. The KBr pressed-disc (13 mm diameter) technique (1 mg of sample and 200 mg of KBr) was used. The spectra were measured in the spectral range from 4000 to 400 cm-1 (64 scans, 4 cm-1 resolutions).
3.8. Thermal analysis
Thermal analysis was carried out using multimodular thermal analyser SETSYS 12-SETARAM equipped with a measurement head TG/DTA rod (Institute of Geonics, CAS, Ostrava). The TG/DTA curves were recorded under an air environment from 25 to 1200 °C, the heating rate was 10 K min− 1.
3.9. Analysis of metals
The metal amount in the supernatant after sorption was found by means of atomic absorption spectrometry (AA240FS Varian, USA) by flame atomization air-acetylene (flow rate 13.5 l min-1, Cu 249.2 nm, and slit width 0.5 nm for Cu.
3.10. Analysis of alkylammonium cations
The HDTMA concentrations in the supernatant after sorption were determined by UV-VIS spectrophotometry (ALS laboratory group, CZ_SOP_D06_07_N03, Ostrava, Czech Republic). The BDHDA and HDP concentrations in the supernatant after sorption were determined by UV VIS spectrophotometry (Varian Cary 50) at 264 nm (BDHDA) and 260 nm (HDP). The amount of the adsorbed metal was determined as a difference between its concentration before and after the sorption. The amount of the adsorbed alkylammonium cation was determined as a difference between its concentration before and after the sorption (equation 2).
4. Results
4.1. Characterization of prepared organo-montmorillonites
The obtained XRD patterns of the organo-montmorillonites were analysed for d-values of the basal spacing (001) and compared with those of the original montmorillonites (Table 1).
montmorillonite
d(001) [nm]
montmorillonite
d(001) [nm]
MMT,SAz-1
1.47
MMT,SWy-2
1.36
MMT,SAz-1–HDTMA
1.65
MMT,SWy-2–HDTMA
1.68 – 2.40
MMT,SAz-1–BDHDA
1.78 – 2.40
MMT,SWy-2–BDHDA
1.79
MMT,SAz-1–HDP
1.69 – 2.20
MMT,SWy-2–HDP
1.72
Table 1.
able 1.Basal spacing values d(001)
The organo-montmorillonites exhibited an evident increase of the basal spacing in comparison with those of the unmodified which indicates an intercalation of alkylammonium cations in their interlayer [38 - 40]. The obtained values about 1.7 nm can be judged to bilayer arrangement of cations, the higher values about 2.2 – 2.4 nm probably correspond to a paraffin-type of arrangement – the ammonium groups are attached to the silicate layer, the nonopolar chains are oriented under the tilt angle [41, 42].
The infrared spectra of the original montmorillonites have been already studied [37] and interpreted according to [43]. The infrared spectra of the organo-montmorillonites were interpreted with help of the spectra of the pure alkylammonium salts to distinguish new absorption bands in the organo-montmorillonites. All infrared spectra exhibited characteristic absorption bands of the presented alkylammonium cations. The absorption bands at 2920 cm-1 correspond to antisymmetric stretching vibrations and the bands at 2850 cm-1 to symmetric stretching vibrations of C – H bounds reflecting alkyl chains of alkylammonium cations. The presence of benzene ring in BDHDA and HDP is confirmed by symmetric stretching vibration of C – H bounds in aromates at 3050 cm-1 and by symmetric stretching vibration of C – C bounds of conjugated system at 1620 and 1471 cm-1. The absorption band at 1487 cm-1 corresponds to bending vibration of the N – H bounds of ammonium groups. The measured infrared spectra of MMT,SWy-2 and its derivatives with HDTMA and BDHDA are shown at Figure 2. The other organo-montmorillonites exhibited the similar infrared spectra. The presence of all cations in the organo-montmorillonites is evident due to either intercalation or adsorption process.
Figure 2.
Infrared spectra of montmorillonite SWy-2 and its organo-derivatives
Thermogravimetric (TG) and differential thermal (DTA) curves of the original montmorillonites were found in the curve library of Clay Minerals (Institute of Geonics, CAS, Ostrava). The peak temperatures for montmorillonites obtained from DTA curve are: 166 °C and 234 °C for dehydration, 673 °C and 884 °C for dehydroxilation/melting and 1027 °C for recrystallization/transformation. In the case of the organo-montmorillonites, the shape of TG/DTA curves corresponded to the original montmorillonites, but the thermal effects exhibited the slightly different temperatures and intensities. The organo-montmorillonites exhibited the higher values of temperatures related to the total melting. The temperatures of exothermic effects connected to recrystallization and transformation increased with the increasing amount of the alkylammonium cations. The temperature and intensity of the first two peaks related to the dehydration process decreased with the increasing amount of the added surfactant. In addition, the organo-montmorillonites are subjected to a thermal effect at the temperature interval 270–450 °C corresponding to the alkylammonium decomposition [44]. As expected, the mass loss in the whole temperature interval 25-1200 °C increased with increasing amount of the alkylammonium cations.
The results obtained by X-ray diffraction, infrared spectroscopy and thermal analysis proved the presence of the alkylammonium cations in the organo-montmorillonites. As it was already stated [38, 45] intercalation of alkylammonium cations takes place due to both ion-exchange and induced and π-π interactions forming a double-layer in the interlayer space of montmorillonites. Although the previous work [38] supposed the higher intercalation due to a content of benzene ring in the case of BDHDA, the values of the parameter d(001) (Table 1) do not prove this suggestion.
4.2. Characterization of montmorillonite by zeta potential measurement
4.2.1. The pH influence on zeta potential of montmorillonite suspension
The most important factor that affects the zeta potential is pH. The zeta potential value on its own without a stated pH is only a virtually meaningless number. Generally, the zeta potential versus pH curve will be positive at low pH and lower or negative at high pH. The point where the plot passes through the zero value of the zeta potential is called the isoelectric pointand it is very important from a practical consideration. It is normally the point where the colloidal system is stable to a lesser extent.
The following figure shows a typical curve for the zeta potential value on the pH value in the case of the montmorillonite particles.
Figure 3.
The influence of pH on zeta potential of the MMT,Wy particles
The zeta potential of the montmorillonite particles in distilled water (pH 6) reaches approximately -24 mV, the zeta potential is negative. With increasing addition of alkali to the suspension of pH 6 the particles tends to acquire a more negative charge and with increasing addition of acid a charge is negative to a lesser extent.
At least two main results can be mentioned from the previous picture:
the zeta potential of the montmorillonite particles did not change significantly in the pH range 4 - 9. In this range particles have tendency to coagulate.
in the strongly acid solution the zeta potential became positive but the isoelectric point was not reached.
Next, the zeta potential of the montmorillonite particles in the copper solutions was determined during the Cu(II) sorption. The values of the zeta potential before and after the Cu(II) adsorption on the montmorillonite werecompared (Figure 4).
Figure 4.
Dependence of zeta potential and adsorption of Cu(II) on MMT,Wy on the Cu(II) equilibrium concentration (ce)
The adsorption of the copper ions caused the change of the zeta potential of the clay particles. The zeta potential became more positive. On the contrary to Figure 3 where the isoelectric point was not reached with increasing H+, in the case of addition of the cooper ions the zeta potential was very close to 0 mV. It just confirmed well known fact that the valencies of the ions have great impact on the electrokinetic behaviour of the suspensions.
The zeta potential changes during the Cu(II) sorption can be used as an additional parameter for characterization of the sorption on montmorillonite. The excellent correlation of the Cu(II) adsorption isotherm with the zeta potential dependence on the Cu(II) concentration in the sorption solutions demonstrated on Figure 4 proved this conclusion.
4.2.2. Sorption of alkylammonium cations – coherence of classical batch experiments and zeta potential measurement
The following research has been performed in order to show the above mentioned possibility of zeta potential for evaluation of the sorption processes. The adsorption of HDTMA on the montmorillonite SAz-1 was studied by conventionally measured adsorption isotherms and the zeta potential was measured simultaneously in the sorption suspensions. Figure 5 demonstrates the typical adsorption isotherm which shape indicates the adsorption isotherm of Langmuir model of monolayer coverage of an adsorbent.
Figure 5.
Dependence of zeta potential (blank symbols) and adsorption of HDTM (full symbols) on MMT,SAz-1 on the equilibrium concentration of the HDTMA solution (ce) [45]
Figure 5 shows the remarkable same course of the adsorption isotherm and the changes of zeta potential of the adsorption system indicating a change of the surface charge due to the HDTMA adsorption. In comparison to other studied sorbent (e.g. coal), the zeta potential is influenced by adsorption to a lesser extent on montmorillonite (about 100 mV). However, an amount of the adsorbed HDTMA is much more higher on montmorillonite and it even exceeds its cation exchange capacity, which proves the concept of the double- or triple-layer arrangement of the adsorbed alkylammonium cations. Thus, adsorption of HDTMA on montmorillonite probably takes place by cation exchange into its interlayer space as well on the external surface. Subsequently, the HDTMA adsorption proceeds via van der Waals interactions [45].
4.3. Comparison of Cu(II) sorption on montmorillonites and their organo-derivatives
4.3.1. Batch technique study
The adsorption isotherms of Cu(II) measured by the batch technique on montmorillonites and their alkylammonium-derivatives are demonstrated on Figures 6 and 7. It is evident that the presence of all three alkylammonium cations in the montmorillonites caused a decrease of the Cu(II) sorption. No significant differences were found in the case of individual alkylammonium cation, the sorption was decreased on about 50 % in comparison with the original montmorillonites. The same decrease of sorption was also found in the case of HDTMA [46] and tetrabutylammonium cations [47]. The sorption sites of clay mineral are occupied by a relatively great alkylammonium cation, which inhibits sorption of the metal cations.
Figure 6.
Adsorption isotherms of Cu(II) on MMTA,SAz-1 and its organo-derivatives
Figure 7.
Adsorption isotherms of Cu(II) on MMTA,SWy-2 and its organo-derivatives
The linearized forms of the adsorption isotherms proved that all obtained adsorption isotherms exhibited the Langmuir model of sorption. The linearized forms of the adsorption isotherms were used to calculate a maximum adsorbed amount of Cu(II) named aCu(Table 2). The values of parameter aCu indicate no significant differences between the studied organo-montmorillonites. This fact corresponds to the found changes of the parameter d(001) that indicated very similar increase of the basal spacing in all prepared organo-montmorillonites (Table 1).
Montmorillonite
aCu [mmol . g-1]
montmorillonite
aCu [mmol . g-1]
MMT,SAz-1
0.34
MMT,Swy-2
0.38
MMT,SAz-1–HDTMA
0.17
MMT,Swy-2–HDTMA
0.17
MMT,SAz-1–BDHDA
0.17
MMT,Swy-2–BDHDA
0.17
MMT,SAz-1–HDP
0.18
MMT,Swy-2–HDP
0.16
Table 2.
Maximum absorbed amount of Cu(II) on montmorillonites and their organo-derivatives
4.3.2. Cyclic voltammetry study
Multisweep cyclic voltammetry (MCV) represents a suitable technique to study adsorption of metals onto a modifier in the carbon paste. In the case of the montmorillonite modifier the obtained current increases with successive occupation of the ion-exchange sites of its structure until a constant, maximum value of current (steady state current) is achieved. The obtained dependences of the current response on a number of cycling (on time) can be used as a characteristic feature for the metals sorption on montmorillonites. The typical multisweep cyclic voltammograms are shown on Figure 8 that depicts MCV of Cu(II) performed on the carbon paste electrode modified with MMT,SAz-1. The successive occupation of the ion-exchange sites of montmorillonite with increasing number of cycling (time) caused the current increase corresponded to the adsorbed amount of Cu(II) [8,10] (the underneath voltammetric peak on Figure 8).
The Cu(II) sorption on two types of montmorillonite – SWy-2 and SAz-1 - was studied by means of multisweep cyclic voltammetry. The obtained current responses on the carbon paste electrodes CPE(MMT,SWy-2) and CPE(MMT,SAz-1) exhibited the time dependences that correspond to the Cu(II) sorption on the montmorillonites (Figure 9). These dependences enable to distinguish the Cu(II) sorption on the various types of montmorillonite. It is seen, that the higher sorption capacity was found in the case of MMT,SWy-2. These finding closely corresponds to the results obtained by the batch technique (Table 2) that proved the slightly higher sorption on the MMT,SWy-2, too.
The multisweep voltammetric study of the Cu(II) sorption on the montmorillonite and its organo-derivative has already demonstrated that the organo-derivative MMT,SAz-1-HDTM exhibited the lower steady state current due to a lower sorption of Cu(II) (Figure 10). The cation exchange sites of the MMT,SAz-1-HDTMA are occupied with the HDTMA cations, which inhibits sorption of the cationic forms Cu2+ and [Cu(ac)]+ (ac – acetate) in comparison with the unmodified montmorillonite. HDTM incorporated into the interlayer of MMT,SAz-1 decreased the Cu(II) sorption approximately to 65 % [48].
Figure 8.
Multisweep cyclic voltammetry of Cu(II) (2.5 x 10-5 mol. l-1) in acetate buffer pH 3.6 on CPE(MMT,SAz-1)
Figure 9.
Multisweep cyclic voltammetry of Cu(II) (2.5 x 10-5 mol.l-1) in acetate buffer pH 3,6on CPE(MMT,SAz-1) and CPE(MMT,SWy-2)
In this study MCV of the Cu(II) was performed by the same procedure [48] on the carbon paste electrodes modified with the prepared organo-montmorillonites MMT,SAz-1-BDHDA, MMT,SAz-1-HDP, MMT,SWy-2-BDHDA, and MMT,SWy-2-HDP. The MCV voltammograms of Cu(II) performed on the CPEs modified with the organo-montmorillonites in the medium of acetate buffer pH 3.6 – 5.2 were used to construct the dependence of the maximum current response (steady state current) on the cycling time. The typical dependences in comparison to the above mentioned results [48] are shown on Figure 10. The dependences also indicate the decrease of the steady state current on all organo-montmorillonites in comparison to the original montmorillonite.
Figure 10.
Current vs. t dependences for MCV of Cu(II) (2.5 x 10-5 mol. l-1) in acetate buffer pH 4.0 on CPEs modifed with organo-montmorillonites
The steady state current decrease corresponds to the decrease of the Cu(II) sorption onto the modifier in the carbon paste which is caused by the presence of the alkylammonium cations in the interlayer structure or on the surface of the montmorillonite modifier in the carbon paste electrode. It is seen form Figure 10 that the Cu(II) sorption is decreased on about 80 % and 63 % in the case of MMT,SAz-1-HDP, resp. MMT,SAz-BDHDA.
Although the demonstrated dependences(Figure 9 and 10) cannot be considered as the classical sorption isotherms, they indicates the same characteristics of the Cu(II) sorption:
the higher sorption capacity to Cu(II) was found for MMT,SWy-2 by means of the classical sorption isotherms as well as by the multisweep cyclic voltammetry on the carbon paste electrodes modified with montmorillonites
the highestsorption was found on the original montmorillonites by the batch technique as well as by the multisweep cyclic voltammetry on the carbon paste electrode modified with the original montmorillonite
all prepared organo-montmorillonites exhibited significantly lower sorption capacity for Cu(II) calculated from the adsorption isotherms as well as measured by means of the multisweep cyclic voltammetry on the carbon paste electrode modified with the organo-montmorillonites.
5. Conclusions
The applied electrochemical techniques – measurement of zeta potential and multisweep cyclic voltammetry – offer possibility to study and characterize properties of clay minerals connected with the sorption processes on their surfaces.
The zeta potential measurement is a method suitable for characterization of the clay minerals particles from the point of view of their surface charge that is one of the significant parameters influencing sorption on clay minerals. As it was shown the measurement of zeta potential enable to determine the pH range where the montmorillonite particles did not change significantly the surface charge and where they tend to coagulate. The zeta potential measurement during sorption of Cu(II) exhibited the excellent agreement of the zeta potential dependenceon the Cu(II) equilibrium concentration with the adsorption isotherm measured by the classical sorption experiments (batch techniques). Analogously, the same course of the adsorption isotherm and the zeta potential changes in the sorption system of montmorillonite – hexadecyltrimethylammoniumcation was found. The zeta potential changes can be compared with its changes on other sorbents (coals). The alkylammonium adsorption way can be evaluated from the zeta potential changes [45].
Multisweep cyclic voltammetry represents another method to characterize the metals sorption using the electrodes modified with a studied adsorbent – clay mineral. The current response dependences on time give the typical curves suitable to describe the sorption. The following general conclusions can be obtained by this method:
comparison of the individual clay minerals in terms of their sorption capacity
influence of the alkylammonium presence in the clay mineral on the metals sorption
influence of other important parameters on the sorption – for example pH, presence of other cations, temperature
The advantage of multisweep cyclic voltammetry consists in relatively fast performance providing the first idea about sorption. For example, measurement on carbon paste electrode takes about 20 – 30 min in comparison with the time-consuming batch sorption experiments – minimum 24 hours. On the other hand, multisweep cyclic voltammetry enable only a semi-quantitative evaluation of sorption.
The described electrochemical methods can be successfully used as the additional methods of study and characterization of clay minerals.
Acknowledgement
The contribution has been done in connection with the project Institute of Environmental Technologies, reg. no. CZ.1.05/2.1.00/03.0100 supported by Research and Development for Innovations Operational Programme financed by Structural Founds of Europe Union and from the means of state budget of the Czech Republic.
The authors are also grateful to The Specific university research Ostrava University, project No. sgs18/PrF/2011.
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Introduction",level:"1"},{id:"sec_2",title:"2. Experimental part",level:"1"},{id:"sec_2_2",title:"2.1. Materials and chemicals ",level:"2"},{id:"sec_4",title:"3. Procedures",level:"1"},{id:"sec_4_2",title:"3.1. Preparation of carbon paste electrodes",level:"2"},{id:"sec_5_2",title:"3.2. Cyclic voltammetry ",level:"2"},{id:"sec_6_2",title:"3.3. Sorption of copper ",level:"2"},{id:"sec_7_2",title:"3.4. Zeta potential measurement",level:"2"},{id:"sec_8_2",title:"3.5. Preparation of organo-montmorillonites",level:"2"},{id:"sec_9_2",title:"3.6. X-ray diffraction ",level:"2"},{id:"sec_10_2",title:"3.7. Infrared spectroscopy",level:"2"},{id:"sec_11_2",title:"3.8. Thermal analysis",level:"2"},{id:"sec_12_2",title:"3.9. Analysis of metals",level:"2"},{id:"sec_13_2",title:"3.10. Analysis of alkylammonium cations",level:"2"},{id:"sec_15",title:"4. Results",level:"1"},{id:"sec_15_2",title:"4.1. Characterization of prepared organo-montmorillonites",level:"2"},{id:"sec_16_2",title:"4.2. Characterization of montmorillonite by zeta potential measurement",level:"2"},{id:"sec_16_3",title:"4.2.1. The pH influence on zeta potential of montmorillonite suspension",level:"3"},{id:"sec_17_3",title:"4.2.2. Sorption of alkylammonium cations – coherence of classical batch experiments and zeta potential measurement",level:"3"},{id:"sec_19_2",title:"4.3. Comparison of Cu(II) sorption on montmorillonites and their organo-derivatives ",level:"2"},{id:"sec_19_3",title:"Table 2.",level:"3"},{id:"sec_20_3",title:"4.3.2. Cyclic voltammetry study",level:"3"},{id:"sec_23",title:"5. Conclusions",level:"1"},{id:"sec_24",title:"Acknowledgement",level:"1"}],chapterReferences:[{id:"B1",body:'hosh P K, Bard A J1983Clay-modified Electrodes. J. am. chem. soc. 10556915693'},{id:"B2",body:'BardA. J.MalloukT.1992Electrodes Modified with Clays, Zeolites, and Related Microporous Solids. In: Murray R W, editor. Molecular Design of Electrode Surfaces. New York: J. 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Anal. chim. acta. 38591101'},{id:"B16",body:'KulaP.NavratilovaZ.2001Anion Exchange of Gold Chloro Complexes on Carbon Paste Electrode Modified with Montmorillonite for Determination of Gold in Pharmaceuticals. Electroanalysis. 13795798'},{id:"B17",body:'NavratilovaZ.KulaP.2000Determination of Gold Using Clay Modified Carbon Paste Electrode.Fresenius j. anal. chem. 367369372'},{id:"B18",body:'TonleI. K.NgameniE.WalcariusA.2004From Clay- to Organoclay-film Modified Electrodes: tuning chargé selectivity in Ion Exchange Voltammetry. Electrochim. Acta. 4934353443'},{id:"B19",body:'Grabec-SveglI.OgorevcB.HudnikV.1996A Methodological Approach to the Application of a Vermiculite Modified Carbon Paste Electrode in Interaction Studies: Influence of Some Pesticides on the Uptake of Cu(II) from a Solutions to the Solid Phase. 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K.et al.(200PermselectivePreconcentrationProperties.ofa.Surfactant-intercalatedClay.ModifiedElectrode.Electroanalysis. 1822432250\n\t\t\t'},{id:"B24",body:'ManisankarP.SelvanathanG.VedhiC.2006Determination of Pesticides Using Heteropolyacid Montmorillonite Clay-Modified Electrode with Surfactant. Talanta. 68686692\n\t\t\t'},{id:"B25",body:'FernandezL.BorrásC.CarreroH.2006Electrochemical Behavior of Phenol in Alkaline Media at hydrotalcite-like Clay/Anionic surfactants/Glassy Carbon Modified Electrode. Electrochim. Acta. 52872884'},{id:"B26",body:'FernandezM.FernándezL.BorrasC.MostanyJ.CarreroH.2007Characterization of Surfactant/Hydrotalcite-like Clay/Glassy Carbon Modified Electrodes: Oxidation of Phenol. Anal. chim. Acta. 597245256'},{id:"B27",body:'YangH.ZhengX.HuangW.WuK.2008Modification of Montmorillonite with Cationic Surfactant and Application in Electrochemical Determination of 4-chlorophenol. Colloid and surfaces B: biointerfaces. 65281284\n\t\t\t'},{id:"B28",body:'NewtonDias.FilhoL.doRibeiroCarmo. D.2006Study of an Organically Modified Clay: Selectvie Adsorption of Heavy Metal Ions and Voltammetric Determination of Mercury(II). Talanta. 68919927'},{id:"B29",body:'MarsalekR.2009The influence of surfactants on the zeta potential of coals. Energ Source Part. A. 316675'},{id:"B30",body:'KaluzaL.GulkovaD.VitZ.ZdrazilM.(200TailoredDistribution.ofMo. O.inthe.TiO.ZrO.SupportedCatalysts.by-AssistedWater.SpreadingProceedings of European Congress of Chemical Engineering (ECCE-6). Copenhagen, 1620September 2007.'},{id:"B31",body:'MarsalekR.(201TheReduction.ofZinc.usingGoethite.ProcessAdsorptionof.PbI. I.CuI. I.CrI. I. I.onSelected.PrecipitateInternational journal of environmental science and development (IJESD). Available http://www.ijesd.org/abstract/133 -C013.htm.Accessed 2011 APR 8.'},{id:"B32",body:'SondiI.BiscanJ.PravdicV.1996Electrokinetics of Pure Clay Minerals Revisited. 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1. Introduction
In the last four decades in Chile, neoliberal policies have synchronized the educational system with the market economy [1]. This has implied, on the one hand, the introduction of new concepts and processes such as quality, efficiency, competition, and accountability [2] more typical of a business model than of an educational one [3]. On the other hand, it has led to profound changes in terms of financing, evaluation, and monitoring of these policies in schools. The main consequence was the disappearance of public education in 1982 and the mutation of the State towards a subsidiary role, delegating the responsibility for education to private or decentralized providers in exchange for a subsidy that functions as an incentive to supply and demand [2]. According to [4],
The state acts as a market-maker in this scenario, as it produces and organizes markets for public assets, such as education. It achieves this not only through a competitive funding system but also by creating policy tools that assign value to education providers through differentiating market signs, such as scores, rankings, and quality ratings, which are then linked to rewards and sanctions. These market signsare crucial for producing school hierarchies, distinction, and comparison, granting school\'s symbolic reputation and, therefore, a sense of competition (p. 116).
However, this arrangement did not ensure improvement in the supply of education, nor did it improve the quality of learning for the poorest. On the contrary, the system of single-value subsidies, as designed, benefited more those with greater sociocultural advantage [1].
1.1 An education policy of accountability based on results
Despite the attempts of the post-dictatorship democratic governments to strengthen state support to education, a series of public policies that deepened the neoliberal model followed, which were finally integrated into a single system aimed at granting funding to schools whose core is managerial accountability, which is strongly associated with results in large-scale evaluations instead of processes [5].
In 2008, the SEP Law [6] was enacted, aimed at improving educational equity for the most disadvantaged groups, providing additional resources to subsidized schools according to the concentration of “priority students”. This subsidy was provided after the school had signed an Equal Opportunity and Educational Excellence Agreement with the Ministry of Education and submitted a School Improvement Project (SIP) in which the school committed itself to achieve important advances in terms of curriculum, school management, school coexistence, and human resources management [6, 7].
More recently, new public institutions were created to closely regulate the best implementation of these public policies, the Agency for the Quality of Education (ACE) and the Superintendence of Education. This was intended to ensure access to quality education and equity for all [8]. The ACE is in charge of the national evaluation process and, according to its results, annually classifies schools according to the performance of 4th-grade students in the test of the Sistema Nacional de Evaluación de resultados de aprendizaje del Ministerio de Educación de Chile (SIMCE) and other complementary indicators, but with a much lower weight. In this way, schools are classified as “autonomous”, “emerging” or “recovering” according to the criteria shown in Table 1. These demands have placed a high pressure on schools, in which eight to nine standardized tests (approximately four levels and four subjects) are applied annually [9].
Weighting
Criteria
“Autonomous” schools
“Recovering” schools
70%
Achievement in the SIMCE Test
Average in SIMCE higher than the median obtained by similar schools
Average in SIMCE less than 220 points
Percentage of students with more than 250 is higher than the median of similar schools
Percentage of students with more than 250 is less than 20%
Percentage of students with more than 300 is higher than the median of similar schools
30%
Administrative dependency
No municipal
Municipal
No municipal
Municipal
Priority student retention rates
25%
25%
25%
25%
Priority Student Pass Rates
25%
25%
25%
25%
Integration of teachers and parents to the IEP
20%
17%
20%
17%
Educational innovations and attraction of external support institutions
15%
13%
15%
13%
Improvement in working conditions and operation of the establishment
15%
13%
15%
13%
Participation of teachers in the national Teacher Evaluation System
—
7%
—
7%
Table 1.
Criteria and weighting for the classification of schools according to their achievements in the SIMCE test and in the other improvement indicators committed to in their IEP.
The “emerging” category is applied when schools show intermediate results, which are qualified as medium or medium-low; when schools have only two SIMCE evaluations or when they are new establishments, or their student body is less than 20.
1.2 Accountability with high consequences
The classification obtained by schools has a direct impact on the funding they receive from the state. High-performing schools are classified as autonomous, receiving double the subsidy per priority child compared to schools classified as emergent. At the other extreme, “recovering” schools that show sustained low performance may have consequences such as the removal of the management team or be subject to definitive closure [4, 10]. These schools are monitored by the ACE through repeated inspection visits aimed at providing feedback on teaching and school management [11].
The basic principle of neoliberal ideology is that institutions do not feel that they have a secure and stable budget, because permanent quality improvement is achieved only through the promise of incentives, risks, and sanctions [4]. However, after more than a decade of its implementation, standardized assessments continue to report a great influence of socioeconomic level (hereafter SES) on learning, showing a large gap between low and high SES students [12, 13]. These results have led us to wonder about teacher subjectivity. Could there be a problem in the beliefs they hold about poverty?
1.3 The crucial role of beliefs
Beliefs are “individual judgments about the truth or falsity of a proposition, a judgment that can only be inferred from a collective understanding of what human beings say, intend, and do” [14] (p. 316). Moreover, because of their affective, evaluative, and episodic nature, they become filters through which new phenomena are interpreted [15] and expectations are developed that influence the teacher’s action [16].
Teachers are not immune to the influence of stereotypical beliefs [17], as these are acquired unconsciously from the experiences and habits of their social environment, which are put into practice on an ongoing basis [18]. A relationship has been found between stereotypical beliefs and low expectations in teachers, which has led to demand changes in the initial and continuous training of teachers to influence their beliefs so that they understand that poverty is a product of gaps in access to opportunities and not of deficiencies in mentality, culture or people [19].
1.4 Research question
What beliefs about poverty hold in-service teachers working in low and lower-middle SES schools with above or below average performance on the SIMCE test of schools of the same type?
2. Methodology
A qualitative design was applied that attempts to detect the importance and meaning of group discourse within a sociocultural context, making explicit the perspective of the subjects within the framework of their global discourse [20].
2.1 Sample
A total of 828 teachers from 1st to 4th grade of the elementary school in the regions of La Araucanía (IVE1: 85.5%) and Los Lagos (IVE: 81.1%) in the southern part of Chile, and Metropolitan (IVE 65.5%), in the center of the country, participated. The sample is representative, proportional to the national percentage of schools that had the following characteristics: 1) received state subsidy (municipal: 59.6% and subsidized: 40.4%); 2) belonged to the low and lower-middle SES, classified as Type A and B respectively; and 3) achieved performance above and below the average of schools in their same group and region according to national standardized tests (SIMCE). All participants signed an informed consent form after receiving information about the study.
The average age was 40 years (SD: 16.3) and 13 years of teaching experience (SD: 11.4). 83% of the sample were female teachers. A total of 88.3% had a basic education teaching degree. Table 2 shows the distribution of the participating teachers by region.
Region
Low-SES, High SIMCE
Low-SES, Low SIMCE
Lower-middle SES, High SIMCE
Lower-middle SES, Low SIMCE
Total
%
Metropolitan
53
42
156
115
366
44.2
La Araucanía
55
64
75
60
254
30.7
Los Lagos
39
39
75
55
208
25.1
Total
147
245
306
230
828
100
%
17.8
17.5
37.0
27.8
100
Table 2.
Number and percentage of participating teachers according to the region, SES, and performance of their schools.
2.2 Instrument
In order to collect teachers’ beliefs about vulnerable schools, we asked, in the context of a broader questionnaire, the following open-ended question: “State four characteristics of a vulnerable school”, which were to be completed in four blank rows provided for this purpose.
2.3 Analysis
The responses were processed through thematic analysis and semantic field analysis, in order to configure their beliefs. First, the corpus to be studied was established, namely “the four characteristics of the vulnerable school pointed out by teachers from four types of schools”. Next, three evaluators read the transcripts and lifted the categories that emerged from the characteristics mentioned by the teachers. These were “students”, “families”, “teachers”, “schools” and “social system”. In addition, the textual extracts that exemplify them were selected. After comparison and establishment of coincidences, the extracts belonging to each category were joined and these were renamed using new labels to nominate each semantic nucleus (e.g., “low motivation to learn”, “students with behavioral problems”) included in the theme “students”. Finally, the meanings attributed by the participants were discussed and the semantic field representing the narratives about the vulnerable school underlying the teachers’ ideas was established.
3. Results
As shown in Table 3 more than half of the mentions refer to families, with teachers and the system being the least mentioned. Students and schools are in between the two trends. We were interested to know what specifically they say about these clusters, are positive or negative characteristics mentioned? These questions motivated us to a second analysis of the data, which we carried out with thematic analysis and semantic field analysis.
Categories
Low-SES, High SIMCE
Low-SES, Low SIMCE
Lower-middle SES, High SIMCE
Lower-middle SES, Low SIMCE
Total
%
F
%
F
%
F
%
F
%
F
%
Students
129
22.8
123
22.3
264
21.5
204
25
720
22.8
Families
338
59.7
330
59.8
705
57.3
456
52.3
1.829
57.8
Teachers
8
1.4
9
1.6
34
2.8
22
2.7
73
2.3
Schools
89
15.7
87
15.8
211
17.2
131
16.1
518
16.4
Social System
2
0.4
3
0.5
15
1.2
2
0.2
22
0.7
Total
566
552
1.229
815
3.162
100
Table 3.
Frequency and percentage of teacher references in each category of analysis.
The themes that emerged from the analysis of teachers’ responses regarding students, families, and schools are presented in Tables 4–6, respectively. It is worth mentioning that there were no differences in the themes among the four types of schools. It is also observed that the teachers coincided in the order of importance given to each theme, which is reflected in the tables in the arrangement of these from left to right. Each table includes the distinctive features that describe each theme. Thus, for example, we have that the family (see Table 3) was the most mentioned actor, and of this, the theme most emphasized by teachers was the educational level of parents. A review of the features attributed to each theme allows us to see a rather negative conception of the children’s group of origin.
Component/ Theme
Educational level
Family characteristics
Families commitment and support
Family composition
Cultural level
Families
Low level of education; illiteracy; no readers
Poverty; drug addiction; alcoholism; delinquency; violence and abuse; family problems
No commitment to education; low participation; low expectations; lack of accountability; neglect; lack of support
Dysfunctional; poorly constituted; single parent; disaggregated
Cultural deprivation; difficult access to culture
Table 4.
Themes and characteristics attributed to families in vulnerable schools.
Component/ Theme
School retention
Readiness to learn
Motivation to learn
Behavioral aspect
Socio-emotional dimension
Socioeconomic characteristic
Students
High absence; school dropout
lack of habits; Special educational needs; Learning problems; low concentration; poor vocabulary; lack of early stimulation; study
Demotivation; low expectations, no vision of the future/life project; Lack of compromise
Bad discipline; aggressiveness; lack of manners and norms
Parental neglect; loneliness; taken in by other family members; rights violated
Social risk; vulnerability; malnutrition; multiple deprivations
Table 5.
Topics and characteristics attributed to students in vulnerable schools.
Component/ theme
Social environment that surrounds them
Resources
Student characteristics
Selection
Schools
High social risk; conflictive sectors; high dependence on drugs and alcohol; delinquency; vulnerability
Lack of pedagogical resources; lack of technology; infrastructure problems; unmotivating environment.
High rate of priority children; low performance on national tests; high diversity
Not selecting its students; exodus of good students; high student turnover; low enrollment
Table 6.
Topics and characteristics attributed to schools.
Table 4 shows that what stands out most for the teachers is the educational level of the parents and the negative characteristics of the families.
Table 5 presents the themes and traits mentioned by teachers with respect to students. There is a tension between the recognition of negative dispositional aspects of the children, such as problems in learning and low motivation, in contrast with others that would be the product of external forces that would be causing great and serious damage to them. This tension could provoke contradictory feelings in teachers, perceiving them as difficult children, on the one hand, and as children worthy of compassion and pity, on the other.
The themes shown in Table 6 reveal that teachers perceive their schools to be under constant threat from the conditions that surround them and that they feel are beyond their control.
Something interesting to note here is that teachers hardly mention themselves within the characteristics of a vulnerable school. Since there is no clear theme that can be attributed to a particular type of school, it is not possible to condense them into a table due to their low frequency. However, task overload, lack of professional development activities, and lack of collaborative work could be noted as some themes mentioned.
The great coincidence in the themes, the order of importance, and the features attributed to each theme led us to explore whether there is a semantic network that explains how teachers working in different types of vulnerable schools conceive of vulnerable schools. After analyzing the responses, we were able to identify a shared narrative on the topic (see Figure 1). In the first place, it can be seen that the school appears as a victim of the environment in which it is located and as the result of certain conditions imposed by the educational system that has classified it as a vulnerable school. Thus, the socio-cultural environment - which is seen as a place plagued by vice, violence, and crime - determines the bad behavior of the students and the type of family context offered to them at home, which would be the continuity of the external context. These negative characteristics of the family would in turn be caused by their low educational and cultural level and by their inability to change their living conditions given their dysfunctional nature, which are often single-parent families. These latter factors would cause a low family commitment to school and to the education of their children, to whom they would provide very little emotional support, which would have repercussions in the socioemotional area and in the disposition towards learning, preventing them from achieving good educational results. On the other hand, certain school conditions such as the lack of resources and the impossibility of selecting their students, lead them to feel obliged to accept all students feeling without tools to solve the serious discipline problems, learning difficulties, and low motivation to learn that will probably lead students to drop out of school.
Figure 1.
Semantic network on the vulnerable school (own elaboration).
4. Discussion
Our motivation for conducting this study was to find out whether there were differences in beliefs about poverty between teachers in vulnerable low and lower-middle SES schools with high and low performance on the national SIMCE test. Our premise was that schools with good performance, despite being in vulnerable contexts, would have more positive beliefs than those with below-average scores. Contrary to what was predicted, our data show us that there is a shared narrative that evidences a negative evaluation of the environment in which they work, which would confront them with problematic children and families that would prevent them from reaching the standards required by current public policy. Our reflection in the following lines will try to stress the effect of accountability policies on teachers’ tasks and identity by configuring performance scenarios in which they must act strategically in order to receive the prescribed rewards or punishments.
Although the contribution of the SEP Law in terms of financing cannot be ignored, since it has made it possible to acquire technological resources and pedagogical material for schools, in addition to hiring new support staff (psychologists, special educators, and education assistants), increasing teacher hiring and training hours [21, 22] and contracting external consultants [9], it must also be recognized that it has had undesirable consequences for many schools in contexts of poverty by making them more visible due to the demand to show good results in the short and medium term. These schools have been popularly labeled as “vulnerable schools”, which has implied the exodus of non-priority students to more selective schools and a substantive increase in private education [2, 7].
Under the neoliberal model, schools are not only evaluated and ranked according to a competitive logic but are also considered to be comparable to each other [23]. Unfortunately, comparison and competition require that someone always be at the bottom of the ranking [24] and the public policies developed in the last 40 years have left the public school associated with poverty [25]. On the other hand, due to the many demands associated with the results, teachers feel that national tests have standardized and bureaucratized their work, leading them to perform arbitrary and useless tasks [25], which does not allow the development of critical thinking, self-evaluation, and accountability, nor will it motivate school improvement and innovative thinking [23]. Worst of all, trust is placed outside schools, in agencies that are not efficient in sharing useful information for teachers, disempowering them from their expert judgment about learning [24]. When teachers perceive that policies restrict their professional autonomy, in addition to intensifying and deprofessionalizing their work, they adopt strategies of resistance to reforms [5, 25] and will most likely develop narratives of self-defense [23].
A perverse effect of incentive policies that encourage competition between schools and teachers is that they have stimulated individualistic thinking and strategic behavior that enhances personal productivity [26]. This has led teachers to calculate their efforts and to act according to external standards in order to achieve a positive and profitable image [9]. Another powerful effect is seen in institutions, which create school narratives that can strategically eliminate, debate, highlight or obscure scores, ranking and position in the hierarchy, to generate a sense of institutional success, as well as to justify or separate themselves from their indicators of underperformance, transferring responsibility and assigned blame for failure onto others, such as students and their families [23] (pp. 756–757).
Consistent with our results, many studies at the national level have collected negative attributions of teachers towards families, which they consider “poorly constituted”, “dysfunctional” or “violent” [25]. They complain that families are an obstacle to their children’s education, as they do not attend meetings, do not support homework, and do not collaborate with punctuality on arrival [27]. In addition, they feel overloaded with work because they have to start from the bottom due to deficiencies in home education, taking care of basic needs and personal care (cleaning, clothing, food); affective needs (due to precariousness and lack, mistreatment, violence, and abuse) and basic rules of behavior (punctuality, respect for the turn, asking permission), as there is much permissiveness and loss of authority and, in addition, the whole family is involved in drugs or crime [27, 28].
In social comparison, groups are evaluated according to their social status as a respected/unrespected group and liked/disliked by others. They are likely to be evaluating families as low social status and disliked group. This group includes people who fail, who are seen as parasites and abusers of the system, such as vagrants and addicts in general, who arouse emotional reactions of disgust and contempt, which may lead to attacking or neglecting them because of the great discomfort they arouse [29].
Rojas and Leyton (2014) have found negative attitudes towards priority students. Teachers are upset because they believe that the special subsidy goes directly to the child and not to the school. They also show some resentment with priority students because they feel that the law transformed them into “untouchables” by being prevented from making them repeat the grade [21]. In addition, they feel that the priority classification makes them deserving of multiple welfare “handouts”, which is detrimental to non-priority children whose families work very hard. In other cases, a paradox is observed, as priority students are both desired and rejected [27]. They are desired because they mean a significant increase in school admissions, but they are rejected because they produce enrollment leakage and teaching difficulties.
Teachers consider students as “others” who are different from them and that, due to their cultural legitimacy, it is their duty to “culturize” them. They see them as “problem” children, aggressive, uneducable, who do not adapt to the educational system, and who must be domesticated [30]. They also feel that they must put aside pedagogical aspects in order to provide affectivity, sociability, and quality of life to students, but they also think that they only go to school to eat and play [31]. They think that their children are always hungry and lack affection and that their learning difficulties are related to poor nutrition, dyslexia, dyslalia, and psychological disorders that should have been resolved at the preschool level. These disorders would produce cognitive disorganization, limiting their development in basic skills such as describing, comparing, relating, and understanding [32].
It has been found that teachers in low-performing schools attribute the results to the physical and intellectual conditions of their students, drug addiction, and conflicts in high-risk neighborhoods, and therefore see little possibility of change [33]. In a study on diversity, it was found that teachers classify their students into two broad categories according to the origin of their learning difficulties a) those diagnosed with clinical pictures of permanent or transitory learning difficulties and b) those socially vulnerable due to low family cultural capital, the presence of alcoholism and drug addiction, delinquency, the absence of parental figures, abandonment and prostitution [34]. Teachers feel that they work with the most disadvantaged population, with the “Cacho children”, those whom nobody wants [23].
Using the social comparison model, students could be evaluated by teachers as a disrespected but likable group, which includes those who are considered less capable of managing their own lives because they have significant deficits or shortcomings, and for whom they feel pity, an ambivalent emotion that is both paternalistic and neglectful [29].
The effects of the policy of accountability have led to various consequences on teachers. On the one hand, it has technologized their work, deprofessionalizing it. On the other hand, it has aroused negative emotions such as fear of the permanent threat of closure of schools due to persistent underperformance [25]. But in the face of this bleak scenario, many turns to vocation to reaffirm their commitment to these schools [35] and raise their self-perception with a sense of sacrifice, altruism, and transcendence in their teaching action [25]. According to Assaél and Cornejo (2018), teachers feel trampled, repressed, and undervalued, but do not possess for the moment, a more elaborated reaction. In this becoming of subjectivities, many teachers wish that vocation begins to be part of the accountability mechanisms [25].
Unrest also stems from conditions that affect teachers’ job stability. The ambiguity of neoliberal policies has increased “labor flexibility”, making their work more precarious. For example, the Teachers’ Statute allows termination of the contract or reduction of the working day with ease for the employer and the SEP Law reduced stability and hourly wages [26]. This has deepened the feeling of low valuation due to low salaries and work intensification, resulting in discomfort, anger, and fatigue [25]. Most teachers feel pressured and sued by these policies, in addition to feeling unfairly judged by society, because they appear to be responsible for the failure of the poorest students [5, 25, 36, 37].
According to Pascual Medina and Rodríguez Gómez (2018), subjects go through different levels as they become aware of power asymmetries [38]. These start from the first level of “submission” where “asymmetry” exists, but this is perceived as natural, given, and unmodifiable. A second level is “pre-critical” in which “inequality” is felt, in the face of which certain dissatisfaction and resentment begin to manifest themselves and explanations and causalities are sought. The third level would be “integrative criticism”, in which one openly feels “injustice” and begins to analyze social reality with greater precision in order to propose actions for change. The last level would be “liberating criticism”, in which after perceiving “oppression”, the process of social transformation as such begins.
When considering the effects on the learning of the most disadvantaged students, accountability reduces the curriculum to the subjects measured by the standardized test, classes concentrate on rehearsing for the test, cultural and social diversity are considered as problems, and the integral education of students is renounced [24]. It is therefore paradoxical that the Chilean model is used as a reference of quality and an example of success at the international level [25].
5. Conclusions and recommendations
First, we can conclude that teachers have a common narrative about the vulnerable school. This means that the themes, traits and the effect that these variables have been transmitted almost unalterably from one group of teachers to another. We interpret this as a defensive response to the pressures of the neoliberal system that imposes classification categories that no school wants to be in and highly visible negative consequences that threaten the psychological and professional integrity of teachers. The struggle to survive in this scenario leads them to rescue small achievements or to distort information by shifting the responsibility for low results to students and their families.
The teachers’ justification is that the degraded environments surrounding the schools are determining the type of families that bring their children to school and that their nefarious behavior would be affecting their children’s willingness to learn. These discourses are further associated with feelings of pity towards the children and of disgust and contempt towards the families. In this study we see that teachers are only at a second level with respect to becoming aware of asymmetries, looking for causes of failure outside the school’s responsibility, on which they feel they cannot act directly. We must support schools to move to the levels of integrative criticism and liberating criticism so that they can empower themselves by creating adequate solutions to the challenges they face and the ideals they can set for themselves as a community.
Before concluding, we would like to reflect on the title we used to begin this chapter: are teachers’ beliefs the barrier to be considered in the face of the low results obtained by the poorest children? In our analysis, not only did we find a shared narrative without variations from school to school, but we were also able to verify the same narratives in other studies at the national level, all of which were carried out a few years after the implementation of these policies and continue to be reproduced to this day. This story is a barrier, indeed, but it is a way of showing the resistance of teachers to falling into disrepute.
Neoliberal policies in education are based on mistrust, as they postulate that only through incentives and threats will school and teachers mobilize to improve their quality. This causes teachers in schools with high rates of priority students to face stressful working conditions, such as intensified bureaucratic and meaningless tasks, super vigilance, and the obligation to cover the entire curriculum, in addition to preparing children for testing, which leads them to ultimately reduce opportunities for those who need it most.
We believe that there is an urgent need to transform accountability policies towards a notion that encourages school communities to engage in thoughtful and complex dialogs about school challenges and opportunities and ways to improve. Teachers should engage in ethical discussions about the daily practice of schools and promote both professional development and the actualization of democratic principles [23]. This is not only because their purposes and assumptions are not being achieved, but also because they impede the achievement of greater social justice. Intelligent accountability should be based on principles such as trust, dialog, school and teacher autonomy, equitable participation, high expectations, respect for diversity, contextualization, creation, and strengthening of school communities with their own identity, all of them as means for all actors to be mutually responsible for education [24].
Acknowledgments
We thank the Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) of the Agencia Nacional de Investigación y Desarrollo de Chile (ANID) for funding research project No. 1120550 and we also thank IntechOpen for funding a large part of this publication.
Conflict of interest
The authors declare no conflict of interest.
\n',keywords:"beliefs, poverty, teachers, accountability, social justice",chapterPDFUrl:"https://cdn.intechopen.com/pdfs/80205.pdf",chapterXML:"https://mts.intechopen.com/source/xml/80205.xml",downloadPdfUrl:"/chapter/pdf-download/80205",previewPdfUrl:"/chapter/pdf-preview/80205",totalDownloads:78,totalViews:0,totalCrossrefCites:0,dateSubmitted:"December 10th 2021",dateReviewed:"December 21st 2021",datePrePublished:"January 24th 2022",datePublished:null,dateFinished:"January 24th 2022",readingETA:"0",abstract:'The poorest children have the lowest educational results, which the neoliberal model has deepened. The State transferred its responsibility to private and municipalities through supply subsidies, but the amount did not ensure quality. To solve this problem, it provides an additional subsidy for each \\"priority\\" child, demanding accountability, but with high institutional and individual consequences. But the gap remains, and teachers are held accountable for these low results. The literature shows that teachers hold beliefs that prevent them from dealing constructively with this reality. Beliefs about poverty were investigated by asking 828 teachers from low and lower-middle SES schools with standardized test scores above and below the average of similar schools to point out four characteristics of vulnerable schools. The data were analyzed by means of thematic and semantic field analysis. A shared narrative was found, independent of the type of school, attributing failure to the degraded context that surrounds it, from which the families and children come. Neoliberal policies based on accountability have intensified the work of the teacher and the constant threat has led them to self-defense. There is an urgent need to change the approach if opportunities for the poorest children are to be improved.',reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/80205",risUrl:"/chapter/ris/80205",signatures:"Viviana Gómez, María Paz González and Pablo Gutiérrez",book:{id:"10662",type:"book",title:"Pedagogy - Challenges, Recent Advances, New Perspectives, and Applications",subtitle:null,fullTitle:"Pedagogy - Challenges, Recent Advances, New Perspectives, and Applications",slug:null,publishedDate:null,bookSignature:"Dr. Hülya Şenol",coverURL:"https://cdn.intechopen.com/books/images_new/10662.jpg",licenceType:"CC BY 3.0",editedByType:null,isbn:"978-1-80355-088-6",printIsbn:"978-1-80355-087-9",pdfIsbn:"978-1-80355-089-3",isAvailableForWebshopOrdering:!0,editors:[{id:"240203",title:"Dr.",name:"Hülya",middleName:null,surname:"Şenol",slug:"hulya-senol",fullName:"Hülya Şenol"}],productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"}},authors:null,sections:[{id:"sec_1",title:"1. Introduction",level:"1"},{id:"sec_1_2",title:"1.1 An education policy of accountability based on results",level:"2"},{id:"sec_2_2",title:"1.2 Accountability with high consequences",level:"2"},{id:"sec_3_2",title:"1.3 The crucial role of beliefs",level:"2"},{id:"sec_4_2",title:"1.4 Research question",level:"2"},{id:"sec_6",title:"2. Methodology",level:"1"},{id:"sec_6_2",title:"2.1 Sample",level:"2"},{id:"sec_7_2",title:"2.2 Instrument",level:"2"},{id:"sec_8_2",title:"2.3 Analysis",level:"2"},{id:"sec_10",title:"3. Results",level:"1"},{id:"sec_11",title:"4. Discussion",level:"1"},{id:"sec_12",title:"5. Conclusions and recommendations",level:"1"},{id:"sec_13",title:"Acknowledgments",level:"1"},{id:"sec_16",title:"Conflict of interest",level:"1"}],chapterReferences:[{id:"B1",body:'Donoso S. 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Estudios Pedagógicos. 2014;XL,1:205-221. DOI: 10.4067/S0718-07052014000200012'},{id:"B22",body:'Román M, Perticara M, Selman J. Uso de los recursos de la Ley SEP y su efecto en los resultados del SIMCE [Use of the Resources of the SEP Law and Its Effect on the Results of the SIMCE]. Informe Final. Fondo de Investigación y Desarrollo en Educación FONIDE, Ministerio de Educación. 2013. Available from: https://centroestudios.mineduc.cl/wp-content/uploads/sites/100/2017/07/Informe-final-F611118-UAH-Marcela-Roman-1.pdf'},{id:"B23",body:'Falabella A. Do national test scores and quality labels trigger school sef-assessment and accountability? A critical analysis in the Chilean context. British Journal of Sociology of Education. 2016;37(5):743-760. DOI: 10.1080/01425692.2014.976698'},{id:"B24",body:'Flórez MT, Rozas T. Accountability from a social justice perspective: Criticism and proposals. Journal of Educational Change. 2020;21(1):157-182. DOI: 10.1007/s10833-019-09361-3'},{id:"B25",body:'Carrasco A, Luzón C, López V. Identidad docente y políticas de accountability: el Caso de Chile [teachers identity and accountability policies: The case of Chile]. Estudios Pedagógicos. 2019;XLV,2:121-139. DOI: 10.4067/S0718-07052019000200121'},{id:"B26",body:'Assaél J, Cornejo R. Work regulations and teacher subjectivity in a context of standardization and accountability policies in Chile. In: Normand R, Liu M, Carvalho L, Andrade D, Levasseur L, editors. Education Policies and the Restructuring of the Educational Profession, Global and Comparative Perspectives. Singapore: Springer; 2018. pp. 245-257. DOI: 10.1007/978-981-10-8279-5_17'},{id:"B27",body:'Acuña F, Assaél J, Contreras P, Peralta B. La traducción de los discursos de la política educativa en la cotidianeidad de dos escuelas municipales chilenas: La metáfora médica Como vía de análisis [the translation of the discourses of educational policy in the daily life of two Chilean municipal schools: The medical metaphor as a way of analysis]. Psicoperspectivas, Individuo y Sociedad. 2014;13(1):46-55. DOI: 10.5027/psicoperspectivas-Vol13-Issue1-fulltext-363'},{id:"B28",body:'Torche P, Martínez J, Madrid J, Araya J. ¿Qué es “educación de calidad” Para directores y docentes? [what is “quality education” for principals and teachers?]. Calidad en la Educación. 2015;43:103-135. DOI: 10.4067/S0718-45652015000200004'},{id:"B29",body:'Fiske ST. On prejudice & the brain. Daedalus: Journal of the American Academy of Arts and Sciences: Political Pharmacology: Thinking about Drugs. 2007;136:156-159. Available from: https;//www.jstor.org/stable/20028100'},{id:"B30",body:'Ajagan L, Castro A, Díaz A, Alarcón C. Proceso de reconocimiento del alumno problema Como legítimo otro de escuelas vulnerables [process of recognition of the problem student as a legitimate other from vulnerable schools]. Educaçao e Sociedade. 2014;35(127):529-547. DOI: 10.1590/S0101-73302014000200011'},{id:"B31",body:'Pedagógicas R. Entre la discriminación y la soledad: las escuelas vulnerables vistas por sus docentes [Between discrimination and loneliness: Vulnerable schools seen by their teachers]. Docencia. 2008;35:41-48'},{id:"B32",body:'Díaz R, Osses S, Muñoz S. Factores e interacciones del proceso de enseñanza-aprendizaje en contextos rurales de la Araucanía, Chile [Factors and interactions of the teaching-learning process in rural contexts of Araucanía, Chile]. Estudios Pedagógicos. 2016;XLII,3:111-128. DOI: 10.4067/S0718.07052016000400006'},{id:"B33",body:'Rivera C, Volante P. Teorías subjetivas de docentes directivos sobre factores que definen la eficacia de los planes de mejoramiento educativo ley SEP [subjective theories of directive teachers on factors that define the effectiveness of educational improvement plans SEP law]. Estudios Pedagógicos. 2015;XLI,1:237-256. DOI: 10.4067/S0718-07052015000100014'},{id:"B34",body:'Apablaza M. Representaciones sociales de profesores al respecto de la diversidad escolar en relación a los contextos de desempeño profesional, prácticas y formación inicial [social representations of teachers regarding school diversity in relation to the contexts of professional performance, practices and initial training]. Estudios Pedagógicos. 2014;XL,1:7-24. DOI: 10.4067/S0718-07052014000100001'},{id:"B35",body:'Falabella A. El mercado escolar en Chile y el surgimiento de la Nueva Gestión Pública: El tejido de la política entre la dictadura neoliberal y los gobiernos de la centroizquierda (1979 a 2009) [school markets in Chile and the emergence of the new public management: The fabric of policies between a neoliberal dictatorship regime and center-left democratic governments (1979 to 2009)]. Educação & Sociedade. 2015;36(132):699-722. DOI: 10.1590/ES0101-73302015152420'},{id:"B36",body:'Ferrada R. Críticas a las políticas de rendición de cuentas según lo que el profesorado chileno de secundaria considera justo en educación [Criticisms of accountability policies according to what Chilean secondary school teachers consider fair in education]. Revista de Sociología de la Educación (Rase). 2017;10(3):330-246. DOI: 10.7203/RASE.10.3.9905'},{id:"B37",body:'Assaél J, Contreras P, Corbalán F, Palma E, Campos J, Sisto V, et al. La SEP en escuelas municipales emergentes: ¿cambios en la identidad docente? [SEP in emerging municipal schools: Changes in teacher identity?] Paulo Freire. Revista de Pedagogía Crítica. 2012;11(11):219-228. Available from: http://bibliotecadigital.academia.cl/xmlui/handle/123456789/1963'},{id:"B38",body:'Pascual Medina J, Rodríguez GD. Accountability en Chile. Un estudio sociocrítico sobre innovación educativa y control de la docencia [A socio-critical study on educational innovation and teaching control]. Revista Iberoamericana de Evaluación Educativa. 2018;11(2):133-150. DOI: 10.15366/riee2018.11.2.007'}],footnotes:[{id:"fn1",explanation:"Index of educational vulnerability of the Region."}],contributors:[{corresp:"yes",contributorFullName:"Viviana Gómez",address:"vgomezn@uc.cl",affiliation:'
Pontifical Catholic University of Chile, Villarrica, Chile
The company was founded in Vienna in 2004 by Alex Lazinica and Vedran Kordic, two PhD students researching robotics. While completing our PhDs, we found it difficult to access the research we needed. So, we decided to create a new Open Access publisher. A better one, where researchers like us could find the information they needed easily. The result is IntechOpen, an Open Access publisher that puts the academic needs of the researchers before the business interests of publishers.
",metaTitle:"Our story",metaDescription:"The company was founded in Vienna in 2004 by Alex Lazinica and Vedran Kordic, two PhD students researching robotics. While completing our PhDs, we found it difficult to access the research we needed. So, we decided to create a new Open Access publisher. A better one, where researchers like us could find the information they needed easily. The result is IntechOpen, an Open Access publisher that puts the academic needs of the researchers before the business interests of publishers.",metaKeywords:null,canonicalURL:"/page/our-story",contentRaw:'[{"type":"htmlEditorComponent","content":"
We started by publishing journals and books from the fields of science we were most familiar with - AI, robotics, manufacturing and operations research. Through our growing network of institutions and authors, we soon expanded into related fields like environmental engineering, nanotechnology, computer science, renewable energy and electrical engineering, Today, we are the world’s largest Open Access publisher of scientific research, with over 4,200 books and 54,000 scientific works including peer-reviewed content from more than 116,000 scientists spanning 161 countries. Our authors range from globally-renowned Nobel Prize winners to up-and-coming researchers at the cutting edge of scientific discovery.
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In the same year that IntechOpen was founded, we launched what was at the time the first ever Open Access, peer-reviewed journal in its field: the International Journal of Advanced Robotic Systems (IJARS).
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The IntechOpen timeline
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2004
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Intech Open is founded in Vienna, Austria, by Alex Lazinica and Vedran Kordic, two PhD students, and their first Open Access journals and books are published.
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Alex and Vedran launch the first Open Access, peer-reviewed robotics journal and IntechOpen’s flagship publication, the International Journal of Advanced Robotic Systems (IJARS).
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2005
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IntechOpen publishes its first Open Access book: Cutting Edge Robotics.
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2006
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IntechOpen publishes a special issue of IJARS, featuring contributions from NASA scientists regarding the Mars Exploration Rover missions.
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2008
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Downloads milestone: 200,000 downloads reached
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2009
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Publishing milestone: the first 100 Open Access STM books are published
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2010
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Downloads milestone: one million downloads reached
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IntechOpen expands its book publishing into a new field: medicine.
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2011
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Publishing milestone: More than five million downloads reached
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IntechOpen publishes 1996 Nobel Prize in Chemistry winner Harold W. Kroto’s “Strategies to Successfully Cross-Link Carbon Nanotubes”. Find it here.
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IntechOpen and TBI collaborate on a project to explore the changing needs of researchers and the evolving ways that they discover, publish and exchange information. The result is the survey “Author Attitudes Towards Open Access Publishing: A Market Research Program”.
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IntechOpen hosts SHOW - Share Open Access Worldwide; a series of lectures, debates, round-tables and events to bring people together in discussion of open source principles, intellectual property, content licensing innovations, remixed and shared culture and free knowledge.
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2012
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Publishing milestone: 10 million downloads reached
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IntechOpen holds Interact2012, a free series of workshops held by figureheads of the scientific community including Professor Hiroshi Ishiguro, director of the Intelligent Robotics Laboratory, who took the audience through some of the most impressive human-robot interactions observed in his lab.
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2013
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IntechOpen joins the Committee on Publication Ethics (COPE) as part of a commitment to guaranteeing the highest standards of publishing.
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2014
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IntechOpen turns 10, with more than 30 million downloads to date.
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IntechOpen appoints its first Regional Representatives - members of the team situated around the world dedicated to increasing the visibility of our authors’ published work within their local scientific communities.
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2015
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Downloads milestone: More than 70 million downloads reached, more than doubling since the previous year.
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Publishing milestone: IntechOpen publishes its 2,500th book and 40,000th Open Access chapter, reaching 20,000 citations in Thomson Reuters ISI Web of Science.
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40 IntechOpen authors are included in the top one per cent of the world’s most-cited researchers.
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Thomson Reuters’ ISI Web of Science Book Citation Index begins indexing IntechOpen’s books in its database.
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2016
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IntechOpen is identified as a world leader in Simba Information’s Open Access Book Publishing 2016-2020 report and forecast. IntechOpen came in as the world’s largest Open Access book publisher by title count.
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2017
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Downloads milestone: IntechOpen reaches more than 100 million downloads
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Publishing milestone: IntechOpen publishes its 3,000th Open Access book, making it the largest Open Access book collection in the world
We started by publishing journals and books from the fields of science we were most familiar with - AI, robotics, manufacturing and operations research. Through our growing network of institutions and authors, we soon expanded into related fields like environmental engineering, nanotechnology, computer science, renewable energy and electrical engineering, Today, we are the world’s largest Open Access publisher of scientific research, with over 4,200 books and 54,000 scientific works including peer-reviewed content from more than 116,000 scientists spanning 161 countries. Our authors range from globally-renowned Nobel Prize winners to up-and-coming researchers at the cutting edge of scientific discovery.
\n\n
In the same year that IntechOpen was founded, we launched what was at the time the first ever Open Access, peer-reviewed journal in its field: the International Journal of Advanced Robotic Systems (IJARS).
\n\n
The IntechOpen timeline
\n\n
2004
\n\n
\n\t
Intech Open is founded in Vienna, Austria, by Alex Lazinica and Vedran Kordic, two PhD students, and their first Open Access journals and books are published.
\n\t
Alex and Vedran launch the first Open Access, peer-reviewed robotics journal and IntechOpen’s flagship publication, the International Journal of Advanced Robotic Systems (IJARS).
\n
\n\n
2005
\n\n
\n\t
IntechOpen publishes its first Open Access book: Cutting Edge Robotics.
\n
\n\n
2006
\n\n
\n\t
IntechOpen publishes a special issue of IJARS, featuring contributions from NASA scientists regarding the Mars Exploration Rover missions.
\n
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2008
\n\n
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Downloads milestone: 200,000 downloads reached
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2009
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Publishing milestone: the first 100 Open Access STM books are published
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\n\n
2010
\n\n
\n\t
Downloads milestone: one million downloads reached
\n\t
IntechOpen expands its book publishing into a new field: medicine.
\n
\n\n
2011
\n\n
\n\t
Publishing milestone: More than five million downloads reached
\n\t
IntechOpen publishes 1996 Nobel Prize in Chemistry winner Harold W. Kroto’s “Strategies to Successfully Cross-Link Carbon Nanotubes”. Find it here.
\n\t
IntechOpen and TBI collaborate on a project to explore the changing needs of researchers and the evolving ways that they discover, publish and exchange information. The result is the survey “Author Attitudes Towards Open Access Publishing: A Market Research Program”.
\n\t
IntechOpen hosts SHOW - Share Open Access Worldwide; a series of lectures, debates, round-tables and events to bring people together in discussion of open source principles, intellectual property, content licensing innovations, remixed and shared culture and free knowledge.
\n
\n\n
2012
\n\n
\n\t
Publishing milestone: 10 million downloads reached
\n\t
IntechOpen holds Interact2012, a free series of workshops held by figureheads of the scientific community including Professor Hiroshi Ishiguro, director of the Intelligent Robotics Laboratory, who took the audience through some of the most impressive human-robot interactions observed in his lab.
\n
\n\n
2013
\n\n
\n\t
IntechOpen joins the Committee on Publication Ethics (COPE) as part of a commitment to guaranteeing the highest standards of publishing.
\n
\n\n
2014
\n\n
\n\t
IntechOpen turns 10, with more than 30 million downloads to date.
\n\t
IntechOpen appoints its first Regional Representatives - members of the team situated around the world dedicated to increasing the visibility of our authors’ published work within their local scientific communities.
\n
\n\n
2015
\n\n
\n\t
Downloads milestone: More than 70 million downloads reached, more than doubling since the previous year.
\n\t
Publishing milestone: IntechOpen publishes its 2,500th book and 40,000th Open Access chapter, reaching 20,000 citations in Thomson Reuters ISI Web of Science.
\n\t
40 IntechOpen authors are included in the top one per cent of the world’s most-cited researchers.
\n\t
Thomson Reuters’ ISI Web of Science Book Citation Index begins indexing IntechOpen’s books in its database.
\n
\n\n
2016
\n\n
\n\t
IntechOpen is identified as a world leader in Simba Information’s Open Access Book Publishing 2016-2020 report and forecast. IntechOpen came in as the world’s largest Open Access book publisher by title count.
\n
\n\n
2017
\n\n
\n\t
Downloads milestone: IntechOpen reaches more than 100 million downloads
\n\t
Publishing milestone: IntechOpen publishes its 3,000th Open Access book, making it the largest Open Access book collection in the world
\n
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Scientific deep-water surveys and intensive research programs (REVIZEE) along the past decade indicate that Brazilian elasmobranch diversity is higher than previously imagined. However, the deep-water fishery threatens this poorly known community of sharks and rays on the Brazilian continental slope as they become bycatch of a fast-growing and uncontrolled fishery. The recent study case of the monkfish (Lophius gastrophysus) fishery dynamics, well presented and discussed by the Brazilian scientific community, provided evidence of the need of bycatch-specific monitoring programs and fast-response fishery regulations. The present work discusses the Brazilian deep-water elasmobranch bycatch problem under the light of its biological diversity and completely unknown population status. Suggestions and management considerations are presented in order to coordinate and manage the establishment and growth of this deep-water fishery in Brazil.",book:{id:"5895",slug:"chondrichthyes-multidisciplinary-approach",title:"Chondrichthyes",fullTitle:"Chondrichthyes - Multidisciplinary Approach"},signatures:"Getulio Rincon, Rodrigo Cordeiro Mazzoleni, Ana Rita Onodera\nPalmeira and Rosangela Lessa",authors:[{id:"205621",title:"Dr.",name:"Getulio",middleName:null,surname:"Rincon",slug:"getulio-rincon",fullName:"Getulio Rincon"},{id:"206465",title:"MSc.",name:"Rodrigo",middleName:null,surname:"Mazzoleni",slug:"rodrigo-mazzoleni",fullName:"Rodrigo Mazzoleni"},{id:"206466",title:"MSc.",name:"Ana Rita",middleName:null,surname:"Palmeira",slug:"ana-rita-palmeira",fullName:"Ana Rita Palmeira"},{id:"206467",title:"Dr.",name:"Rosangela",middleName:null,surname:"Lessa",slug:"rosangela-lessa",fullName:"Rosangela Lessa"}]},{id:"56228",doi:"10.5772/intechopen.70028",title:"A Review of the Mitogenomic Phylogeny of the Chondrichthyes",slug:"a-review-of-the-mitogenomic-phylogeny-of-the-chondrichthyes",totalDownloads:1483,totalCrossrefCites:6,totalDimensionsCites:9,abstract:"The phylogenetic analysis of the Chondrichthyes has been the subject of intense debate over the past two decades. The principal relationships within the group based on the analysis of morphological traits are inconsistent with the available molecular topologies, and the phylogeny of these animals is highly controversial, at all levels, ranging from superorders to families and even the genera within families. With the recent development of new generation sequencing (NGS), many phylogenies are now being inferred based on the complete genome of the species. In 2015 and 2016 alone, around 21 new elasmobranch genomes were made available in GenBank. In this context, the principal objective of the present study was to infer the phylogeny of the sharks and rays based on the complete mitochondrial genomes available in the literature. A total of 73 mitogenomes of chondrichthyan species were analyzed. The phylogenetic trees generated rejected the “Hypnosqualea” hypothesis and confirmed the monophyly of the Neoselachii and Batoidea as sister groups of the sharks. These mitogenomic analyses provided ampler and more complete insights into the relationships between the sharks and rays, in particular, the topologies obtained by the analyses revealed a number of incongruities in certain groups of sharks and rays, and the interrelationships between them.",book:{id:"5895",slug:"chondrichthyes-multidisciplinary-approach",title:"Chondrichthyes",fullTitle:"Chondrichthyes - Multidisciplinary Approach"},signatures:"Divino Bruno da Cunha, Luis Fernando da Silva Rodrigues‐Filho and\nJoão Bráullio de Luna Sales",authors:[{id:"104512",title:"Dr.",name:"Luis Fernando",middleName:null,surname:"Rodrigues-Filho",slug:"luis-fernando-rodrigues-filho",fullName:"Luis Fernando Rodrigues-Filho"},{id:"205219",title:"Dr.",name:"Divino Bruno",middleName:null,surname:"Da Cunha",slug:"divino-bruno-da-cunha",fullName:"Divino Bruno Da Cunha"},{id:"205690",title:"Dr.",name:"João Bráullio De",middleName:null,surname:"Luna Sales",slug:"joao-braullio-de-luna-sales",fullName:"João Bráullio De Luna Sales"}]},{id:"52331",doi:"10.5772/64252",title:"Setting Up Traceability Tools for the Indonesian Blue Swimming Crab Fishery: A Case Study in Southeast Sulawesi",slug:"setting-up-traceability-tools-for-the-indonesian-blue-swimming-crab-fishery-a-case-study-in-southeas",totalDownloads:1694,totalCrossrefCites:2,totalDimensionsCites:5,abstract:"The Indonesian blue swimming crab fishery developed rapidly during the 1990s to become an important source of income for coastal communities. The blue swimming crab (BSC) in 2015 is the third highest export commodity in Indonesia, primarily to USA markets. Southeast (SE) Sulawesi is a relatively minor area for blue swimming crab production (approximately 1200–2000 mt per annum), in which only a subset of Asosiasi Pengelolaan Rajungan Indonesia (APRI) members are active, and it may be a conducive region in which to conduct a pilot activity to form a fisheries management structure that demonstrates the benefits that can be achieved via collaboration. The control document (CD) is a traceability and documentation process to be implemented by all of the segments of the supply chain (collectors/cooking stations, miniplants, and processors) in order to promote compliance to new Ministry and Marine Affair (MMAF) regulations and generate the records and documents of the supply chain application and verification of the new regulations. The self-recorded logbook by the fishermen and miniplant, as the point in the supply chain, could help with a meaningful and long-term solution to the fishery management in Southeast Sulawesi. This is the first trial of CD in Indonesia and could be a good model for BSC fishery in other region in Indonesia.",book:{id:"5210",slug:"fisheries-and-aquaculture-in-the-modern-world",title:"Fisheries and Aquaculture in the Modern World",fullTitle:"Fisheries and Aquaculture in the Modern World"},signatures:"Hawis Madduppa, Zairion, Siti Nuraini, Kuncoro Nugroho and\nBambang Arif Nugraha",authors:[{id:"180161",title:"Dr.",name:"Hawis",middleName:null,surname:"Madduppa",slug:"hawis-madduppa",fullName:"Hawis Madduppa"},{id:"185944",title:"Dr.",name:"Zairion",middleName:null,surname:"Zairion",slug:"zairion-zairion",fullName:"Zairion Zairion"},{id:"185945",title:"Mrs.",name:"Siti",middleName:null,surname:"Nuraini",slug:"siti-nuraini",fullName:"Siti Nuraini"},{id:"185946",title:"Mr.",name:"Bambang Arif",middleName:null,surname:"Nugraha",slug:"bambang-arif-nugraha",fullName:"Bambang Arif Nugraha"},{id:"185947",title:"Mr.",name:"Kuncoro Catur",middleName:null,surname:"Nugroho",slug:"kuncoro-catur-nugroho",fullName:"Kuncoro Catur Nugroho"}]}],mostDownloadedChaptersLast30Days:[{id:"50289",title:"Effect of Special Fish Feed Prepared Using Food Industrial Waste on Labeo rohita",slug:"effect-of-special-fish-feed-prepared-using-food-industrial-waste-on-labeo-rohita",totalDownloads:2298,totalCrossrefCites:0,totalDimensionsCites:0,abstract:"All food processing industries generate wastes of varying nature in significant quantities. Managing these wastes so as to minimize the impact on the environment is the prime concern. The concept of waste has undergone much change in recent times, with the focus being on utilizing the waste materials as inputs for generation of new or reusable products. Vegetable and fruit wastes are generated in significant quantities and are easily available at minimal charge. The comparative utilization of these wastes as a dietary ingredient was assessed employing the Labeo rohita fingerlings as the test species. The study was conducted over a period of 60 days. Orange peels and potato peels are characterized, and then, formulation of orange peel feed (OPF) and potato peel feed (PPF) was carried out. Market common fish feed (CFF) was taken as a control. The three test diets were designated as CFF, OPF and PPF. Feeding was done once daily. The water quality parameters such as dissolved oxygen, water temperature pH, total alkalinity, total hardness; calcium hardness and magnesium hardness as well as growth response were monitored at fortnightly intervals. The quality of water was maintained by periodic partial replenishment over the period of study. On termination of the trial, higher growth response was recorded in the PPF treatment. The initial and final weight and length of fishes was recorded. The results shows significant growth in PPF and OPF showed brighter body scales than other two feed. Fishes were very healthy and normal throughout the study period indicating no adverse effect on their health. No infection whatsoever was noted during 60 days of experimental period.",book:{id:"5210",slug:"fisheries-and-aquaculture-in-the-modern-world",title:"Fisheries and Aquaculture in the Modern World",fullTitle:"Fisheries and Aquaculture in the Modern World"},signatures:"Sanyogita R. Verma and Shanta Satyanarayan",authors:[{id:"183699",title:"Dr.",name:"Verma",middleName:"Rajroop",surname:"Sanyogita",slug:"verma-sanyogita",fullName:"Verma Sanyogita"},{id:"185353",title:"Dr.",name:"Shanta",middleName:null,surname:"Satyanarayan",slug:"shanta-satyanarayan",fullName:"Shanta Satyanarayan"}]},{id:"51124",title:"Fishery Status and Taxonomy of the Carangids (Pisces) in the Northern Arabian Sea Coast of Pakistan",slug:"fishery-status-and-taxonomy-of-the-carangids-pisces-in-the-northern-arabian-sea-coast-of-pakistan",totalDownloads:1980,totalCrossrefCites:2,totalDimensionsCites:2,abstract:"The objectives of this study were i) to evaluate number of existing members of the family Carangidae in the area ii) to establish a distinguishable and lucid key based on the taxonomic characteristics, meristic count and otolith description. In this study, thirty-six species were collected from the main fish landing facilities between 2012~2015. Fish body colour, taxonomic characteristics, fin rays and otolith shape description were used to identify each species. Otolith description comprises of shape of ostium, sulcus and margins of anterior and posterior surface along with distinct definite shape possess by each species make it easier for identification.",book:{id:"5210",slug:"fisheries-and-aquaculture-in-the-modern-world",title:"Fisheries and Aquaculture in the Modern World",fullTitle:"Fisheries and Aquaculture in the Modern World"},signatures:"Nazia Qamar, Sher Khan Panhwar and Ghazala Siddiqui",authors:[{id:"182414",title:"Dr.",name:"Sher Khan",middleName:null,surname:"Panhwar",slug:"sher-khan-panhwar",fullName:"Sher Khan Panhwar"},{id:"184264",title:"Dr.",name:"Nazia",middleName:null,surname:"Qamar",slug:"nazia-qamar",fullName:"Nazia Qamar"},{id:"184265",title:"Prof.",name:"Ghazala",middleName:null,surname:"Siddiqui",slug:"ghazala-siddiqui",fullName:"Ghazala Siddiqui"}]},{id:"50583",title:"Trawl Selectivity in the Barents Sea Demersal Fishery",slug:"trawl-selectivity-in-the-barents-sea-demersal-fishery",totalDownloads:1716,totalCrossrefCites:1,totalDimensionsCites:1,abstract:"This chapter provides a general overview of the Barents Sea demersal trawl fishery. First, it reviews historical catch levels and current biomass status of four commercially important demersal species (cod, haddock, Greenland halibut, and redfish) and includes an overview of their management plan that has been carried out by the Joint Norwegian–Russian commission. Then, it presents the evolution of the technical regulations for improving size selectivity in this fishery and describes current challenges in gear selectivity. Later, this chapter describes the concept of size selectivity, introduces the selective parameters that define a selection curve, and progressively introduces different parametric models that describe the selection process. The most common experimental methods and gear used to collect selectivity data are described, and their advantages and disadvantages are discussed. Finally, this chapter describes an alternative, or a complementary method, to the conventional estimation of trawl selectivity—the FISHSELECT method. This method is based on morphology measurements and fish penetration models to estimate the selective properties of different mesh shapes and sizes at different mesh openings, which are later used to provide simulation-based prediction of size selectivity. FISHSELECT has already been applied to four important species of the Barents Sea Demersal Fishery, and the results have in all cases showed to be coherent with the results obtained from sea trial results.",book:{id:"5210",slug:"fisheries-and-aquaculture-in-the-modern-world",title:"Fisheries and Aquaculture in the Modern World",fullTitle:"Fisheries and Aquaculture in the Modern World"},signatures:"Eduardo Grimaldo, Manu Sistiaga, Bent Herrmann and Roger B.\nLarsen",authors:[{id:"107079",title:"Dr.",name:"Eduardo",middleName:null,surname:"Grimaldo",slug:"eduardo-grimaldo",fullName:"Eduardo Grimaldo"},{id:"185311",title:"Dr.",name:"Manu",middleName:null,surname:"Sistiaga",slug:"manu-sistiaga",fullName:"Manu Sistiaga"},{id:"185312",title:"Dr.",name:"Bent",middleName:null,surname:"Herrmann",slug:"bent-herrmann",fullName:"Bent Herrmann"},{id:"185313",title:"Prof.",name:"Roger B.",middleName:null,surname:"Larsen",slug:"roger-b.-larsen",fullName:"Roger B. Larsen"}]},{id:"50363",title:"The Brown Seaweeds Fishery in Chile",slug:"the-brown-seaweeds-fishery-in-chile",totalDownloads:1755,totalCrossrefCites:4,totalDimensionsCites:10,abstract:"Chilean fishery of brown algae includes species belonging to the genus Lessonia, Durvillaea, and Macrocystis, which can be found along the coast, ranging latitudes from 18° to 55°S. The exploitation of these seaweeds is done mainly in the Northern coast because the environmental conditions of this region decrease initial production costs. Brown algae are exploited from natural populations and exported to international markets as row material, source of alginates, widely utilized in diverse manufacturing processes and industries. International demand for Chilean kelps has produced sustained increase in harvest during the last decade, reaching more than 390,000 dry tons/year. This chapter approaches the most relevant aspects of the brown seaweed fishery in Chile which covers a wide range of the Southeast Pacific coast, considering the number of commercial species, its abundance and distribution, knowledge achieved on their ecology and biology regarding management, and conservation of these resources, and finally, provides tools for stakeholders and policy makers directed to sustainable management of natural kelp beds occurring in the cold temperate seas.",book:{id:"5210",slug:"fisheries-and-aquaculture-in-the-modern-world",title:"Fisheries and Aquaculture in the Modern World",fullTitle:"Fisheries and Aquaculture in the Modern World"},signatures:"Julio A. Vásquez",authors:[{id:"180745",title:"Dr.",name:"Julio",middleName:null,surname:"Vásquez",slug:"julio-vasquez",fullName:"Julio Vásquez"}]},{id:"50462",title:"Direction of Fisheries (SUISAN) Education from a Historical Perspective in Japan",slug:"direction-of-fisheries-suisan-education-from-a-historical-perspective-in-japan",totalDownloads:1450,totalCrossrefCites:0,totalDimensionsCites:1,abstract:"Fishing, aquaculture, and food processing is collectively referred to as “SUISAN”, and the term was translated to “fisheries” in the Meiji period. Fisheries education in Japan was at its dawn. Fisheries education was necessary for improvement of local fisheries subsistence. Fisheries education was performed, centering on nurturing of mid-career engineers for deep-sea fishing after 1950s. However, when the Heisei period in the 1990s started, “participatory = citizen involvement type fisheries education” was promoted extensively. Future establishment of a Japanese version of Sea Grants is desired to promote citizen involvement in fisheries education with systematized involvement of universities, research institutions, aquaria, and local people.",book:{id:"5210",slug:"fisheries-and-aquaculture-in-the-modern-world",title:"Fisheries and Aquaculture in the Modern World",fullTitle:"Fisheries and Aquaculture in the Modern World"},signatures:"Tsuyoshi Sasaki",authors:[{id:"180712",title:"Dr.",name:"Tsuyoshi",middleName:null,surname:"Sasaki",slug:"tsuyoshi-sasaki",fullName:"Tsuyoshi Sasaki"}]}],onlineFirstChaptersFilter:{topicId:"348",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:90,numberOfOpenTopics:6,numberOfUpcomingTopics:0,issn:"2633-1403",doi:"10.5772/intechopen.79920",isOpenForSubmission:!0},{id:"7",title:"Biomedical Engineering",numberOfPublishedBooks:12,numberOfPublishedChapters:107,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2631-5343",doi:"10.5772/intechopen.71985",isOpenForSubmission:!0}],lsSeriesList:[{id:"11",title:"Biochemistry",numberOfPublishedBooks:33,numberOfPublishedChapters:330,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2632-0983",doi:"10.5772/intechopen.72877",isOpenForSubmission:!0},{id:"25",title:"Environmental Sciences",numberOfPublishedBooks:1,numberOfPublishedChapters:19,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2754-6713",doi:"10.5772/intechopen.100362",isOpenForSubmission:!0},{id:"10",title:"Physiology",numberOfPublishedBooks:14,numberOfPublishedChapters:145,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2631-8261",doi:"10.5772/intechopen.72796",isOpenForSubmission:!0}],hsSeriesList:[{id:"3",title:"Dentistry",numberOfPublishedBooks:9,numberOfPublishedChapters:140,numberOfOpenTopics:2,numberOfUpcomingTopics:0,issn:"2631-6218",doi:"10.5772/intechopen.71199",isOpenForSubmission:!0},{id:"6",title:"Infectious Diseases",numberOfPublishedBooks:13,numberOfPublishedChapters:123,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2631-6188",doi:"10.5772/intechopen.71852",isOpenForSubmission:!0},{id:"13",title:"Veterinary Medicine and Science",numberOfPublishedBooks:11,numberOfPublishedChapters:112,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:22,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2753-894X",doi:"10.5772/intechopen.100359",isOpenForSubmission:!0},{id:"23",title:"Education and Human Development",numberOfPublishedBooks:0,numberOfPublishedChapters:11,numberOfOpenTopics:1,numberOfUpcomingTopics:1,issn:null,doi:"10.5772/intechopen.100360",isOpenForSubmission:!0},{id:"24",title:"Sustainable Development",numberOfPublishedBooks:1,numberOfPublishedChapters:19,numberOfOpenTopics:5,numberOfUpcomingTopics:0,issn:"2753-6580",doi:"10.5772/intechopen.100361",isOpenForSubmission:!0}],testimonialsList:[{id:"13",text:"The collaboration with and support of the technical staff of IntechOpen is fantastic. The whole process of submitting an article and editing of the submitted article goes extremely smooth and fast, the number of reads and downloads of chapters is high, and the contributions are also frequently cited.",author:{id:"55578",name:"Antonio",surname:"Jurado-Navas",institutionString:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRisIQAS/Profile_Picture_1626166543950",slug:"antonio-jurado-navas",institution:{id:"720",name:"University of Malaga",country:{id:null,name:"Spain"}}}},{id:"6",text:"It is great to work with the IntechOpen to produce a worthwhile collection of research that also becomes a great educational resource and guide for future research endeavors.",author:{id:"259298",name:"Edward",surname:"Narayan",institutionString:null,profilePictureURL:"https://mts.intechopen.com/storage/users/259298/images/system/259298.jpeg",slug:"edward-narayan",institution:{id:"3",name:"University of Queensland",country:{id:null,name:"Australia"}}}}]},series:{item:{id:"6",title:"Infectious Diseases",doi:"10.5772/intechopen.71852",issn:"2631-6188",scope:"This series will provide a comprehensive overview of recent research trends in various Infectious Diseases (as per the most recent Baltimore classification). Topics will include general overviews of infections, immunopathology, diagnosis, treatment, epidemiology, etiology, and current clinical recommendations for managing infectious diseases. Ongoing issues, recent advances, and future diagnostic approaches and therapeutic strategies will also be discussed. This book series will focus on various aspects and properties of infectious diseases whose deep understanding is essential for safeguarding the human race from losing resources and economies due to pathogens.",coverUrl:"https://cdn.intechopen.com/series/covers/6.jpg",latestPublicationDate:"August 12th, 2022",hasOnlineFirst:!0,numberOfPublishedBooks:13,editor:{id:"131400",title:"Prof.",name:"Alfonso J.",middleName:null,surname:"Rodriguez-Morales",slug:"alfonso-j.-rodriguez-morales",fullName:"Alfonso J. Rodriguez-Morales",profilePictureURL:"https://mts.intechopen.com/storage/users/131400/images/system/131400.png",biography:"Dr. Rodriguez-Morales is an expert in tropical and emerging diseases, particularly zoonotic and vector-borne diseases (especially arboviral diseases). He is the president of the Travel Medicine Committee of the Pan-American Infectious Diseases Association (API), as well as the president of the Colombian Association of Infectious Diseases (ACIN). He is a member of the Committee on Tropical Medicine, Zoonoses, and Travel Medicine of ACIN. He is a vice-president of the Latin American Society for Travel Medicine (SLAMVI) and a Member of the Council of the International Society for Infectious Diseases (ISID). Since 2014, he has been recognized as a Senior Researcher, at the Ministry of Science of Colombia. He is a professor at the Faculty of Medicine of the Fundacion Universitaria Autonoma de las Americas, in Pereira, Risaralda, Colombia. He is an External Professor, Master in Research on Tropical Medicine and International Health, Universitat de Barcelona, Spain. He is also a professor at the Master in Clinical Epidemiology and Biostatistics, Universidad Científica del Sur, Lima, Peru. In 2021 he has been awarded the “Raul Isturiz Award” Medal of the API. Also, in 2021, he was awarded with the “Jose Felix Patiño” Asclepius Staff Medal of the Colombian Medical College, due to his scientific contributions to COVID-19 during the pandemic. He is currently the Editor in Chief of the journal Travel Medicine and Infectious Diseases. His Scopus H index is 47 (Google Scholar H index, 68).",institutionString:"Institución Universitaria Visión de las Américas, Colombia",institution:null},editorTwo:null,editorThree:null},subseries:{paginationCount:4,paginationItems:[{id:"3",title:"Bacterial Infectious Diseases",coverUrl:"https://cdn.intechopen.com/series_topics/covers/3.jpg",isOpenForSubmission:!0,editor:{id:"205604",title:"Dr.",name:"Tomas",middleName:null,surname:"Jarzembowski",slug:"tomas-jarzembowski",fullName:"Tomas Jarzembowski",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRKriQAG/Profile_Picture_2022-06-16T11:01:31.jpg",biography:"Tomasz Jarzembowski was born in 1968 in Gdansk, Poland. He obtained his Ph.D. degree in 2000 from the Medical University of Gdańsk (UG). After specialization in clinical microbiology in 2003, he started studying biofilm formation and antibiotic resistance at the single-cell level. In 2015, he obtained his D.Sc. degree. His later study in cooperation with experts in nephrology and immunology resulted in the designation of the new diagnostic method of UTI, patented in 2017. He is currently working at the Department of Microbiology, Medical University of Gdańsk (GUMed), Poland. Since many years, he is a member of steering committee of Gdańsk branch of Polish Society of Microbiologists, a member of ESCMID. He is also a reviewer and a member of editorial boards of a number of international journals.",institutionString:"Medical University of Gdańsk, Poland",institution:null},editorTwo:{id:"484980",title:"Dr.",name:"Katarzyna",middleName:null,surname:"Garbacz",slug:"katarzyna-garbacz",fullName:"Katarzyna Garbacz",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0033Y00003St8TAQAZ/Profile_Picture_2022-07-07T09:45:16.jpg",biography:"Katarzyna Maria Garbacz, MD, is an Associate Professor at the Medical University of Gdańsk, Poland and she is head of the Department of Oral Microbiology of the Medical University of Gdańsk. She has published more than 50 scientific publications in peer-reviewed journals. She has been a project leader funded by the National Science Centre of Poland. Prof. Garbacz is a microbiologist working on applied and fundamental questions in microbial epidemiology and pathogenesis. Her research interest is in antibiotic resistance, host-pathogen interaction, and therapeutics development for staphylococcal pathogens, mainly Staphylococcus aureus, which causes hospital-acquired infections. Currently, her research is mostly focused on the study of oral pathogens, particularly Staphylococcus spp.",institutionString:"Medical University of Gdańsk, Poland",institution:null},editorThree:null},{id:"4",title:"Fungal Infectious Diseases",coverUrl:"https://cdn.intechopen.com/series_topics/covers/4.jpg",isOpenForSubmission:!0,editor:{id:"174134",title:"Dr.",name:"Yuping",middleName:null,surname:"Ran",slug:"yuping-ran",fullName:"Yuping Ran",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bS9d6QAC/Profile_Picture_1630330675373",biography:"Dr. Yuping Ran, Professor, Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China. Completed the Course Medical Mycology, the Centraalbureau voor Schimmelcultures (CBS), Fungal Biodiversity Centre, Netherlands (2006). International Union of Microbiological Societies (IUMS) Fellow, and International Emerging Infectious Diseases (IEID) Fellow, Centers for Diseases Control and Prevention (CDC), Atlanta, USA. Diploma of Dermatological Scientist, Japanese Society for Investigative Dermatology. Ph.D. of Juntendo University, Japan. Bachelor’s and Master’s degree, Medicine, West China University of Medical Sciences. Chair of Sichuan Medical Association Dermatology Committee. General Secretary of The 19th Annual Meeting of Chinese Society of Dermatology and the Asia Pacific Society for Medical Mycology (2013). In charge of the Annual Medical Mycology Course over 20-years authorized by National Continue Medical Education Committee of China. Member of the board of directors of the Asia-Pacific Society for Medical Mycology (APSMM). Associate editor of Mycopathologia. Vice-chief of the editorial board of Chinses Journal of Mycology, China. Board Member and Chair of Mycology Group of Chinese Society of Dermatology.",institutionString:null,institution:{name:"Sichuan University",institutionURL:null,country:{name:"China"}}},editorTwo:null,editorThree:null},{id:"5",title:"Parasitic Infectious Diseases",coverUrl:"https://cdn.intechopen.com/series_topics/covers/5.jpg",isOpenForSubmission:!0,editor:{id:"67907",title:"Dr.",name:"Amidou",middleName:null,surname:"Samie",slug:"amidou-samie",fullName:"Amidou Samie",profilePictureURL:"https://mts.intechopen.com/storage/users/67907/images/system/67907.jpg",biography:"Dr. Amidou Samie is an Associate Professor of Microbiology at the University of Venda, in South Africa, where he graduated for his PhD in May 2008. He joined the Department of Microbiology the same year and has been giving lectures on topics covering parasitology, immunology, molecular biology and industrial microbiology. He is currently a rated researcher by the National Research Foundation of South Africa at category C2. He has published widely in the field of infectious diseases and has overseen several MSc’s and PhDs. His research activities mostly cover topics on infectious diseases from epidemiology to control. His particular interest lies in the study of intestinal protozoan parasites and opportunistic infections among HIV patients as well as the potential impact of childhood diarrhoea on growth and child development. He also conducts research on water-borne diseases and water quality and is involved in the evaluation of point-of-use water treatment technologies using silver and copper nanoparticles in collaboration with the University of Virginia, USA. 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His research interests involve understanding the molecular mechanisms of host defense during human viral infections and developing new predictive, preventive, and therapeutic strategies for them using Japanese encephalitis virus (JEV), HIV, and emerging viruses as a model via stem cell and cell culture technologies. His research work has been published in various high-impact factor journals (Science, PNAS, Nature Medicine) with a high number of citations. He has received many awards and honors in India and abroad including various Young Scientist Awards, BBSRC India Partnering Award, and Dr. JC Bose National Award of Department of Biotechnology, Min. of Science and Technology, Govt. of India. 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He previously worked as a post-doctoral fellow at the Ben-Gurion University of Negev, Israel; University of the Free State, South Africa; and Central University of Technology Bloemfontein, South Africa. He obtained his Ph.D. in Organic Chemistry from Nagaoka University of Technology, Japan. He has published more than seventy-four journal articles and attended several national and international conferences as speaker and chair. Dr. Kendrekar has received many international awards. He has several funded projects, namely, anti-malaria drug development, MRSA, and SARS-CoV-2 activity of curcumin and its formulations. He has filed four patents in collaboration with the University of Central Lancashire and Mayo Clinic Infectious Diseases. His present research includes organic synthesis, drug discovery and development, biochemistry, nanoscience, and nanotechnology.",institutionString:"Visiting Scientist at Lipid Nanostructures Laboratory, Centre for Smart Materials, School of Natural Sciences, University of Central Lancashire",institution:null},{id:"428125",title:"Dr.",name:"Vinayak",middleName:null,surname:"Adimule",slug:"vinayak-adimule",fullName:"Vinayak Adimule",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/428125/images/system/428125.jpg",biography:"Dr. Vinayak Adimule, MSc, Ph.D., is a professor and dean of R&D, Angadi Institute of Technology and Management, India. He has 15 years of research experience as a senior research scientist and associate research scientist in R&D organizations. He has published more than fifty research articles as well as several book chapters. He has two Indian patents and two international patents to his credit. Dr. Adimule has attended, chaired, and presented papers at national and international conferences. He is a guest editor for Topics in Catalysis and other journals. He is also an editorial board member, life member, and associate member for many international societies and research institutions. His research interests include nanoelectronics, material chemistry, artificial intelligence, sensors and actuators, bio-nanomaterials, and medicinal chemistry.",institutionString:"Angadi Institute of Technology and Management",institution:null},{id:"284317",title:"Prof.",name:"Kantharaju",middleName:null,surname:"Kamanna",slug:"kantharaju-kamanna",fullName:"Kantharaju Kamanna",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/284317/images/21050_n.jpg",biography:"Prof. K. Kantharaju has received Bachelor of science (PCM), master of science (Organic Chemistry) and Doctor of Philosophy in Chemistry from Bangalore University. He worked as a Executive Research & Development @ Cadila Pharmaceuticals Ltd, Ahmedabad. He received DBT-postdoc fellow @ Molecular Biophysics Unit, Indian Institute of Science, Bangalore under the supervision of Prof. P. Balaram, later he moved to NIH-postdoc researcher at Drexel University College of Medicine, Philadelphia, USA, after his return from postdoc joined NITK-Surthakal as a Adhoc faculty at department of chemistry. Since from August 2013 working as a Associate Professor, and in 2016 promoted to Profeesor in the School of Basic Sciences: Department of Chemistry and having 20 years of teaching and research experiences.",institutionString:null,institution:{name:"Rani Channamma University, Belagavi",country:{name:"India"}}},{id:"158492",title:"Prof.",name:"Yusuf",middleName:null,surname:"Tutar",slug:"yusuf-tutar",fullName:"Yusuf Tutar",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/158492/images/system/158492.jpeg",biography:"Prof. Dr. Yusuf Tutar conducts his research at the Hamidiye Faculty of Pharmacy, Department of Basic Pharmaceutical Sciences, Division of Biochemistry, University of Health Sciences, Turkey. He is also a faculty member in the Molecular Oncology Program. He obtained his MSc and Ph.D. at Oregon State University and Texas Tech University, respectively. He pursued his postdoctoral studies at Rutgers University Medical School and the National Institutes of Health (NIH/NIDDK), USA. His research focuses on biochemistry, biophysics, genetics, molecular biology, and molecular medicine with specialization in the fields of drug design, protein structure-function, protein folding, prions, microRNA, pseudogenes, molecular cancer, epigenetics, metabolites, proteomics, genomics, protein expression, and characterization by spectroscopic and calorimetric methods.",institutionString:"University of Health Sciences",institution:null},{id:"180528",title:"Dr.",name:"Hiroyuki",middleName:null,surname:"Kagechika",slug:"hiroyuki-kagechika",fullName:"Hiroyuki Kagechika",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/180528/images/system/180528.jpg",biography:"Hiroyuki Kagechika received his bachelor’s degree and Ph.D. in Pharmaceutical Sciences from the University of Tokyo, Japan, where he served as an associate professor until 2004. He is currently a professor at the Institute of Biomaterials and Bioengineering (IBB), Tokyo Medical and Dental University (TMDU). From 2010 to 2012, he was the dean of the Graduate School of Biomedical Science. Since 2012, he has served as the vice dean of the Graduate School of Medical and Dental Sciences. He has been the director of the IBB since 2020. Dr. Kagechika’s major research interests are the medicinal chemistry of retinoids, vitamins D/K, and nuclear receptors. He has developed various compounds including a drug for acute promyelocytic leukemia.",institutionString:"Tokyo Medical and Dental University",institution:{name:"Tokyo Medical and Dental University",country:{name:"Japan"}}},{id:"94311",title:"Prof.",name:"Martins",middleName:"Ochubiojo",surname:"Ochubiojo Emeje",slug:"martins-ochubiojo-emeje",fullName:"Martins Ochubiojo Emeje",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/94311/images/system/94311.jpeg",biography:"Martins Emeje obtained a BPharm with distinction from Ahmadu Bello University, Nigeria, and an MPharm and Ph.D. from the University of Nigeria (UNN), where he received the best Ph.D. award and was enlisted as UNN’s “Face of Research.” He established the first nanomedicine center in Nigeria and was the pioneer head of the intellectual property and technology transfer as well as the technology innovation and support center. Prof. Emeje’s several international fellowships include the prestigious Raman fellowship. He has published more than 150 articles and patents. He is also the head of R&D at NIPRD and holds a visiting professor position at Nnamdi Azikiwe University, Nigeria. He has a postgraduate certificate in Project Management from Walden University, Minnesota, as well as a professional teaching certificate and a World Bank certification in Public Procurement. Prof. Emeje was a national chairman of academic pharmacists in Nigeria and the 2021 winner of the May & Baker Nigeria Plc–sponsored prize for professional service in research and innovation.",institutionString:"National Institute for Pharmaceutical Research and Development",institution:{name:"National Institute for Pharmaceutical Research and Development",country:{name:"Nigeria"}}},{id:"436430",title:"Associate Prof.",name:"Mesut",middleName:null,surname:"Işık",slug:"mesut-isik",fullName:"Mesut Işık",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/436430/images/19686_n.jpg",biography:null,institutionString:null,institution:{name:"Bilecik University",country:{name:"Turkey"}}},{id:"268659",title:"Ms.",name:"Xianquan",middleName:null,surname:"Zhan",slug:"xianquan-zhan",fullName:"Xianquan Zhan",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/268659/images/8143_n.jpg",biography:"Dr. Zhan received his undergraduate and graduate training in the fields of preventive medicine and epidemiology and statistics at the West China University of Medical Sciences in China during 1989 to 1999. He received his post-doctoral training in oncology and cancer proteomics for two years at the Cancer Research Institute of Human Medical University in China. In 2001, he went to the University of Tennessee Health Science Center (UTHSC) in USA, where he was a post-doctoral researcher and focused on mass spectrometry and cancer proteomics. Then, he was appointed as an Assistant Professor of Neurology, UTHSC in 2005. He moved to the Cleveland Clinic in USA as a Project Scientist/Staff in 2006 where he focused on the studies of eye disease proteomics and biomarkers. He returned to UTHSC as an Assistant Professor of Neurology in the end of 2007, engaging in proteomics and biomarker studies of lung diseases and brain tumors, and initiating the studies of predictive, preventive, and personalized medicine (PPPM) in cancer. In 2010, he was promoted to Associate Professor of Neurology, UTHSC. Currently, he is a Professor at Xiangya Hospital of Central South University in China, Fellow of Royal Society of Medicine (FRSM), the European EPMA National Representative in China, Regular Member of American Association for the Advancement of Science (AAAS), European Cooperation of Science and Technology (e-COST) grant evaluator, Associate Editors of BMC Genomics, BMC Medical Genomics, EPMA Journal, and Frontiers in Endocrinology, Executive Editor-in-Chief of Med One. He has\npublished 116 peer-reviewed research articles, 16 book chapters, 2 books, and 2 US patents. His current main research interest focuses on the studies of cancer proteomics and biomarkers, and the use of modern omics techniques and systems biology for PPPM in cancer, and on the development and use of 2DE-LC/MS for the large-scale study of human proteoforms.",institutionString:null,institution:{name:"Xiangya Hospital Central South University",country:{name:"China"}}},{id:"40482",title:null,name:"Rizwan",middleName:null,surname:"Ahmad",slug:"rizwan-ahmad",fullName:"Rizwan Ahmad",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/40482/images/system/40482.jpeg",biography:"Dr. Rizwan Ahmad is a University Professor and Coordinator, Quality and Development, College of Medicine, Imam Abdulrahman bin Faisal University, Saudi Arabia. Previously, he was Associate Professor of Human Function, Oman Medical College, Oman, and SBS University, Dehradun. Dr. Ahmad completed his education at Aligarh Muslim University, Aligarh. He has published several articles in peer-reviewed journals, chapters, and edited books. His area of specialization is free radical biochemistry and autoimmune diseases.",institutionString:"Imam Abdulrahman Bin Faisal University",institution:{name:"Imam Abdulrahman Bin Faisal University",country:{name:"Saudi Arabia"}}},{id:"41865",title:"Prof.",name:"Farid A.",middleName:null,surname:"Badria",slug:"farid-a.-badria",fullName:"Farid A. Badria",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/41865/images/system/41865.jpg",biography:"Farid A. Badria, Ph.D., is the recipient of several awards, including The World Academy of Sciences (TWAS) Prize for Public Understanding of Science; the World Intellectual Property Organization (WIPO) Gold Medal for best invention; Outstanding Arab Scholar, Kuwait; and the Khwarizmi International Award, Iran. He has 250 publications, 12 books, 20 patents, and several marketed pharmaceutical products to his credit. He continues to lead research projects on developing new therapies for liver, skin disorders, and cancer. Dr. Badria was listed among the world’s top 2% of scientists in medicinal and biomolecular chemistry in 2019 and 2020. He is a member of the Arab Development Fund, Kuwait; International Cell Research Organization–United Nations Educational, Scientific and Cultural Organization (ICRO–UNESCO), Chile; and UNESCO Biotechnology France",institutionString:"Mansoura University",institution:{name:"Mansoura University",country:{name:"Egypt"}}},{id:"329385",title:"Dr.",name:"Rajesh K.",middleName:"Kumar",surname:"Singh",slug:"rajesh-k.-singh",fullName:"Rajesh K. Singh",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/329385/images/system/329385.png",biography:"Dr. Singh received a BPharm (2003) and MPharm (2005) from Panjab University, Chandigarh, India, and a Ph.D. (2013) from Punjab Technical University (PTU), Jalandhar, India. He has more than sixteen years of teaching experience and has supervised numerous postgraduate and Ph.D. students. He has to his credit more than seventy papers in SCI- and SCOPUS-indexed journals, fifty-five conference proceedings, four books, six Best Paper Awards, and five projects from different government agencies. He is currently an editorial board member of eight international journals and a reviewer for more than fifty scientific journals. He received Top Reviewer and Excellent Peer Reviewer Awards from Publons in 2016 and 2017, respectively. He is also on the panel of The International Reviewer for reviewing research proposals for grants from the Royal Society. He also serves as a Publons Academy mentor and Bentham brand ambassador.",institutionString:"Punjab Technical University",institution:{name:"Punjab Technical University",country:{name:"India"}}},{id:"142388",title:"Dr.",name:"Thiago",middleName:"Gomes",surname:"Gomes Heck",slug:"thiago-gomes-heck",fullName:"Thiago Gomes Heck",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/142388/images/7259_n.jpg",biography:null,institutionString:null,institution:{name:"Universidade Regional do Noroeste do Estado do Rio Grande do Sul",country:{name:"Brazil"}}},{id:"336273",title:"Assistant Prof.",name:"Janja",middleName:null,surname:"Zupan",slug:"janja-zupan",fullName:"Janja Zupan",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/336273/images/14853_n.jpeg",biography:"Janja Zupan graduated in 2005 at the Department of Clinical Biochemistry (superviser prof. dr. Janja Marc) in the field of genetics of osteoporosis. Since November 2009 she is working as a Teaching Assistant at the Faculty of Pharmacy, Department of Clinical Biochemistry. In 2011 she completed part of her research and PhD work at Institute of Genetics and Molecular Medicine, University of Edinburgh. She finished her PhD entitled The influence of the proinflammatory cytokines on the RANK/RANKL/OPG in bone tissue of osteoporotic and osteoarthritic patients in 2012. From 2014-2016 she worked at the Institute of Biomedical Sciences, University of Aberdeen as a postdoctoral research fellow on UK Arthritis research project where she gained knowledge in mesenchymal stem cells and regenerative medicine. She returned back to University of Ljubljana, Faculty of Pharmacy in 2016. She is currently leading project entitled Mesenchymal stem cells-the keepers of tissue endogenous regenerative capacity facing up to aging of the musculoskeletal system funded by Slovenian Research Agency.",institutionString:null,institution:{name:"University of Ljubljana",country:{name:"Slovenia"}}},{id:"357453",title:"Dr.",name:"Radheshyam",middleName:null,surname:"Maurya",slug:"radheshyam-maurya",fullName:"Radheshyam Maurya",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/357453/images/16535_n.jpg",biography:null,institutionString:null,institution:{name:"University of Hyderabad",country:{name:"India"}}},{id:"418340",title:"Dr.",name:"Jyotirmoi",middleName:null,surname:"Aich",slug:"jyotirmoi-aich",fullName:"Jyotirmoi Aich",position:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0033Y000038Ugi5QAC/Profile_Picture_2022-04-15T07:48:28.png",biography:"Biotechnologist with 15 years of research including 6 years of teaching experience. Demonstrated record of scientific achievements through consistent publication record (H index = 13, with 874 citations) in high impact journals such as Nature Communications, Oncotarget, Annals of Oncology, PNAS, and AJRCCM, etc. Strong research professional with a post-doctorate from ACTREC where I gained experimental oncology experience in clinical settings and a doctorate from IGIB where I gained expertise in asthma pathophysiology. A well-trained biotechnologist with diverse experience on the bench across different research themes ranging from asthma to cancer and other infectious diseases. An individual with a strong commitment and innovative mindset. Have the ability to work on diverse projects such as regenerative and molecular medicine with an overall mindset of improving healthcare.",institutionString:"DY Patil Deemed to Be University",institution:null},{id:"349288",title:"Prof.",name:"Soumya",middleName:null,surname:"Basu",slug:"soumya-basu",fullName:"Soumya Basu",position:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0033Y000035QxIDQA0/Profile_Picture_2022-04-15T07:47:01.jpg",biography:"Soumya Basu, Ph.D., is currently working as an Associate Professor at Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, Maharashtra, India. With 16+ years of trans-disciplinary research experience in Drug Design, development, and pre-clinical validation; 20+ research article publications in journals of repute, 9+ years of teaching experience, trained with cross-disciplinary education, Dr. Basu is a life-long learner and always thrives for new challenges.\r\nHer research area is the design and synthesis of small molecule partial agonists of PPAR-γ in lung cancer. She is also using artificial intelligence and deep learning methods to understand the exosomal miRNA’s role in cancer metastasis. Dr. Basu is the recipient of many awards including the Early Career Research Award from the Department of Science and Technology, Govt. of India. She is a reviewer of many journals like Molecular Biology Reports, Frontiers in Oncology, RSC Advances, PLOS ONE, Journal of Biomolecular Structure & Dynamics, Journal of Molecular Graphics and Modelling, etc. She has edited and authored/co-authored 21 journal papers, 3 book chapters, and 15 abstracts. She is a Board of Studies member at her university. She is a life member of 'The Cytometry Society”-in India and 'All India Cell Biology Society”- in India.",institutionString:"Dr. D.Y. Patil Vidyapeeth, Pune",institution:{name:"Dr. D.Y. Patil Vidyapeeth, Pune",country:{name:"India"}}},{id:"354817",title:"Dr.",name:"Anubhab",middleName:null,surname:"Mukherjee",slug:"anubhab-mukherjee",fullName:"Anubhab Mukherjee",position:null,profilePictureURL:"https://intech-files.s3.amazonaws.com/0033Y0000365PbRQAU/ProfilePicture%202022-04-15%2005%3A11%3A18.480",biography:"A former member of Laboratory of Nanomedicine, Brigham and Women’s Hospital, Harvard University, Boston, USA, Dr. Anubhab Mukherjee is an ardent votary of science who strives to make an impact in the lives of those afflicted with cancer and other chronic/acute ailments. He completed his Ph.D. from CSIR-Indian Institute of Chemical Technology, Hyderabad, India, having been skilled with RNAi, liposomal drug delivery, preclinical cell and animal studies. He pursued post-doctoral research at College of Pharmacy, Health Science Center, Texas A & M University and was involved in another postdoctoral research at Department of Translational Neurosciences and Neurotherapeutics, John Wayne Cancer Institute, Santa Monica, California. In 2015, he worked in Harvard-MIT Health Sciences & Technology as a visiting scientist. He has substantial experience in nanotechnology-based formulation development and successfully served various Indian organizations to develop pharmaceuticals and nutraceutical products. He is an inventor in many US patents and an author in many peer-reviewed articles, book chapters and books published in various media of international repute. Dr. Mukherjee is currently serving as Principal Scientist, R&D at Esperer Onco Nutrition (EON) Pvt. Ltd. and heads the Hyderabad R&D center of the organization.",institutionString:"Esperer Onco Nutrition Pvt Ltd.",institution:null},{id:"319365",title:"Assistant Prof.",name:"Manash K.",middleName:null,surname:"Paul",slug:"manash-k.-paul",fullName:"Manash K. Paul",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/319365/images/system/319365.png",biography:"Manash K. Paul is a Principal Investigator and Scientist at the University of California Los Angeles. He has contributed significantly to the fields of stem cell biology, regenerative medicine, and lung cancer. His research focuses on various signaling processes involved in maintaining stem cell homeostasis during the injury-repair process, deciphering lung stem cell niche, pulmonary disease modeling, immuno-oncology, and drug discovery. He is currently investigating the role of extracellular vesicles in premalignant lung cell migration and detecting the metastatic phenotype of lung cancer via machine-learning-based analyses of exosomal signatures. Dr. Paul has published in more than fifty peer-reviewed international journals and is highly cited. He is the recipient of many awards, including the UCLA Vice Chancellor’s award, a senior member of the Institute of Electrical and Electronics Engineers (IEEE), and an editorial board member for several international journals.",institutionString:"University of California Los Angeles",institution:{name:"University of California Los Angeles",country:{name:"United States of America"}}},{id:"311457",title:"Dr.",name:"Júlia",middleName:null,surname:"Scherer Santos",slug:"julia-scherer-santos",fullName:"Júlia Scherer Santos",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/311457/images/system/311457.jpg",biography:"Dr. Júlia Scherer Santos works in the areas of cosmetology, nanotechnology, pharmaceutical technology, beauty, and aesthetics. Dr. Santos also has experience as a professor of graduate courses. Graduated in Pharmacy, specialization in Cosmetology and Cosmeceuticals applied to aesthetics, specialization in Aesthetic and Cosmetic Health, and a doctorate in Pharmaceutical Nanotechnology. Teaching experience in Pharmacy and Aesthetics and Cosmetics courses. She works mainly on the following subjects: nanotechnology, cosmetology, pharmaceutical technology, aesthetics.",institutionString:"Universidade Federal de Juiz de Fora",institution:{name:"Universidade Federal de Juiz de Fora",country:{name:"Brazil"}}},{id:"219081",title:"Dr.",name:"Abdulsamed",middleName:null,surname:"Kükürt",slug:"abdulsamed-kukurt",fullName:"Abdulsamed Kükürt",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/219081/images/system/219081.png",biography:"Dr. Kükürt graduated from Uludağ University in Turkey. He started his academic career as a Research Assistant in the Department of Biochemistry at Kafkas University. In 2019, he completed his Ph.D. program in the Department of Biochemistry at the Institute of Health Sciences. He is currently working at the Department of Biochemistry, Kafkas University. He has 27 published research articles in academic journals, 11 book chapters, and 37 papers. He took part in 10 academic projects. He served as a reviewer for many articles. He still serves as a member of the review board in many academic journals. He is currently working on the protective activity of phenolic compounds in disorders associated with oxidative stress and inflammation.",institutionString:null,institution:{name:"Kafkas University",country:{name:"Turkey"}}},{id:"178366",title:"Dr.",name:"Volkan",middleName:null,surname:"Gelen",slug:"volkan-gelen",fullName:"Volkan Gelen",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/178366/images/system/178366.jpg",biography:"Volkan Gelen is a Physiology specialist who received his veterinary degree from Kafkas University in 2011. Between 2011-2015, he worked as an assistant at Atatürk University, Faculty of Veterinary Medicine, Department of Physiology. In 2016, he joined Kafkas University, Faculty of Veterinary Medicine, Department of Physiology as an assistant professor. Dr. Gelen has been engaged in various academic activities at Kafkas University since 2016. There he completed 5 projects and has 3 ongoing projects. 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