Goods tonnage and passenger journeys in Nigeria (Source: Archives of the Nigerian Railway Cooperation).
\r\n\tWithin this scenario, special attention needs to be devoted to financial implications, due to their pervasiveness. Nobody would question the key role that finance plays to complement the real sphere of the economy and that has increasingly attracted both academics and practitioners. As a result, traditional pillars – such as financial markets, products, and institutions – have evolved significantly, with financial innovation fueling further progress over time. The global side of the coin features – among others – financially connected markets, international financial exchanges, and financial conglomerates that provide valuable opportunities in terms of international corporate finance. On the other side, recent advances have involved a wider recourse to ESG factors, allowed forward steps towards a more inclusive financial system, and have made digital finance a must, rather than an option, even though much remains to be accomplished, for instance, to facilitate access to formal financial channels in many underdeveloped regions.
\r\n\r\n\t
\r\n\tThis book aims to examine emerging trends, new perspectives, and empirical applications that deal with globalization and sustainability. The goal is to provide a comprehensive overview of these important concepts as valuable support to successfully meet the challenges and take on the opportunities ahead. At the same time, drawing upon empirical evidence can contribute to bridging the gap between theory and practice, which also fits within the scope of this book.
Energy transitions entail a shift, or movement, in decreasing the use of fossil fuel in our energy supply systems [1]. Across the world, fossil fuels, such as coal, crude oil and natural gas, accounts for a large percentage of our energy supplies. There has been growing interest in energy transitions because beyond the fact that most fossil fuel resources are reserve based, which means that are limited, the major driver of energy transitions is the threat posed by burning the available large quantities of fossil fuels and their corresponding impact on the environment [2]. To generate this transition, the role of policy cannot be overemphasized. The clean energy transition is somewhat unique because it has to be driven by policy. Markets cannot provide the platform to reduce greenhouse gas emissions, since markets naturally tend towards more consumption of fossil fuels. As such, it is important to understand the role of policy, policy levers and policy decisions, in effecting energy transitions [3].
In developing economies, energy supply shortages, poor or non-existent infrastructure and subsidized end-user prices are some key direct challenges which tend to slow-down the implementation of structural changes in energy systems. In industrialized countries, the main challenges are: rapid speed of change and imbalance in the development path of energy systems [4]. Understanding how policy decisions are taken, how current policies are interpreted and how energy infrastructure is shaped, is dependent on the understanding of the actors and stakeholders, their socio-psychological biases, the internal workings of the institutions within which they act, and their organization’s wider interests. On this basis, the broader drivers, influences and consequences of the policy decision process and energy governance need to be considered.
According to the International Energy Agency (IEA), to facilitate energy transition, there is need for concerted, early and consistent policy action [5]. The IEA argues that well designed policies that aid decarbonisation through cutting down on household energy expenses related to fossil fuel and improving air quality can aid the transition to a low carbon economy. The International Renewable Energy Agency (IRENA) further argues that transiting to a low carbon economy will require a drastic deployment of renewable energy solutions and energy efficiency measures [5, 6, 7].
This paper serves as an extension of a previously published work titled “
The previous work emphasized the connection between event, practices and changes in energy supply infrastructure without much attention to the drivers and how they influenced the transition in energy use. This paper looks at the key drivers within each energy era and how they influenced the Nigerian energy transitions.
In this chapter, some methodological considerations used in this research are presented in Section 2. In Section 3, the drivers and influences of Nigeria’s energy supply infrastructure changes are presented. Section 4 discusses these influences further and what they mean for the future of energy in Nigeria. The concluding thoughts are presented in Section 5.
Data from documentary archives and other published sources that links to the Nigerian historical energy infrastructure provisions were used for analysis in order to have a better understanding of the Nigerian energy (infrastructure) history. Diaries, letters, memos and policy documents from the archives of the Nigerian Railway Corporation were used and analyses.
The detailed account of the history of the Nigerian Railways by Francis Jackel (1997) covered in three volumes was also useful sources of data.
It is noteworthy that in many existing transition studies, one can easily notice the extensive use of quantitative (and qualitative) data from published literatures, and particularly archives of some agencies, used in collecting data and making meaningful analyses which serves as pointers, suggesting various constitutive elements of the energy history under study.
These set of documents were selected for analyses for the following reasons:
The Nigerian Railway Corporation is the oldest institution in Nigeria which has existed since colonial times (in late 1800s). They hold some of Nigeria’s oldest archives.
The archives of the Nigerian Railway Corporation (NRC) contain records of associated events that led to decisions on the provision of several rail infrastructure. Some of these documents contained the reasoning (and contexts) behind those decisions and the future benefits the government aimed at achieving. An example is the case of providing rail infrastructure linking Kano to Lagos to aid the easy movement of agricultural produce from the hinterland (in the north of Nigeria) to the ports (in the south of Nigeria) for export [9]. Some, trade and policy contexts on infrastructure decisions taken.
Documentary and archival records were analysed and used to prepare a historical narrative on the various factors that influenced the evolution of energy infrastructure provisions in Nigeria [8]. The following steps were followed in analysing archival documents/records [10, 11].
A panoramic view of the energy eras and the different features that characterized the Nigerian energy transitions within each energy era is presented in Figure 1. The study and analysis of these eras were centred on four important characteristic features that served as points of departure for understanding the influences that have impacted on changes in energy infrastructure supply and use in Nigeria. These central features are:
A panoramic view of the energy eras and the key features of the Nigerian energy transitions (1800–2015).
This research revealed that changes in Nigeria’s energy supply infrastructure have been driven and influenced within the following contexts:
Policy and institutional interventions on energy
Technological interventions and energy technology pathways
Social (societal) practices and public values for energy
Available energy resource options
Economic considerations
Policy and institutional interventions have been one of the greatest contributors to changes and transformation in energy supply infrastructure systems. These policy interventions have come about as a result of the increasing need to address issues, such as energy access, energy security, decarbonizing future energy, and combating the effects of anthropogenic climate change and its consequences.
Technological interventions and different technological pathways have also contributed to changes in energy infrastructure systems in Nigeria over time. This started with the use of steam engines (up to early 1900s), coal fired power plants (up to mid-1900s) and thermal power plants (since the 1980s). The development of renewables (hydroelectric power) started in the mid-1900s. This development is deemed to continue due to national and international pressures to cause a shift to the use of renewables (including the use of solar photovoltaic cells, wind power and nuclear energies where applicable).
Public values for energy was driven more by the perceived (and actual) merit that provision of energy infrastructure conferred. Indeed, there were changes in societal and social practices brought about by the provision of electricity supply infrastructure. Some of these practices, such as commuting, trading and entertainment became more energy intensive. The provision of electricity infrastructure did not only help guaranty the continuation of these practices, but also aided its sophistication.
The availability of natural resources, particularly primary energy resources such as coal, crude oil and natural gas aided the increased use and consumption of those resources. Resource availability served as a primary driver of energy consumption. Rising demand for energy served as a secondary reason. Indeed, the effect of rising demand and resource availability led to transitions in energy use as shown in Figure 1. This same transition was also supported by, and influenced the creation of, several decision-making institutions within each era, as well as the policy direction of the government (see Figure 1).
Economic considerations impacted on historical energy infrastructure investments. Future energy infrastructure supply will require further leadership and sustained investments by public and private entities in providing energy infrastructure that addresses the changing (current and future) needs of people in society. Governments, through public institutions, will have to provide economic incentives to increase energy infrastructure provision through promulgation of policies to aid private investment going into the future.
The following sub-sections now delve into the details of the various influences/drivers of energy systems change within each energy era.
This era, which was characterized more by agricultural practices and interventions, saw the extensive use of traditional biomass (mostly by-products of agriculture, such as wood) as the major source of energy. The following were key drivers of energy infrastructure supply in this era:
Institutional interventions
Economic considerations
Energy resource options
Social practices and public values
There were two pre-dominant decision-making institutions during this era:
Families
Traditional institutions (rulers)
Decisions at the level of families were made based on their available resources and needs. By-products from agriculture such as oils were used for addressing lighting needs using oil lamps [12]. A source of food for most families was through peasant farming. Decisions on domestic energy needs impacted on increased energy demand in the forms of food calories and other agricultural by-products required for various domestic needs such as wood for cooking. Indeed, the aggregate value of the combined energy needs of several families resulted in thinking about new innovative ways of addressing and satisfying the rising energy demand.
Rulers of traditional communities played a pivotal role with respect to trade activities. For most communities, traditional rulers, together with the traditional council (also known as ‘council of chiefs’ in some cultures in Nigeria) encouraged people within their communities to embark on activities that can potentially increase trade activities with other communities and foreign envoys [12]. There are several evidence of this in Badagry area of Lagos and the great Benin kingdom. Trade, which encouraged the exchange of practices and ideas led people in several communities to adopt practices that were energy intensive [13]. Increased trade activities during this era led to the cultivation of more crops for domestic consumption and export [14].
Families and rulers of traditional communities (together with traditional councils—the equivalent of congress at community levels) were the main institutional drivers of energy infrastructure changes and use during this era.
During this era, increased agricultural output was considered synonymous to economic prosperity. Growth in agricultural productivity meant increased potential for more trade leading to increased income. Since agriculture was the mainstay of the economy during this era, increased productivity helped in sustaining families, maintaining communities and supporting traditional festivals, such as: the harvest festivals.
During this era, the available energy resource was from food calories. Decisions on energy resource use depended on families and local communities. The availability of food calories meant that most practices performed were based on manual labour and draft animal labour. This was very demanding as there was need other energy resource options that could help reduce the use of manual labour in achieving different practices.
During this era, energy from food calories was perceived as a common (societal) good. The availability of this energy source provided the basis for several practices to be implemented in different sort of ways, such as commuting and trade. Trade was a very important practice that led to more demand for energy. Trade activities improved and many Nigerian locals saw the need to increase their export produce that would be sold to their trade partners. It is the perceived value (a means of livelihood) and the trade practices that led to demand for new forms of energy to help increase production output of food produce, arts and crafts for export.
This era saw the extensive use of metallurgical interventions in energy use. The key drivers of energy infrastructure supply during this era were:
Institutional interventions
Technological interventions
Economic considerations
The institutional decision-making platforms that were vital in shaping this stage of the Nigerian energy transition were:
Colonial institutions
Traditional institutions (traditional rulers)
The British colonial government was the key decision maker during this era. Since Nigeria was divided into regions, there were regional governors for the northern, western and eastern regions. Decision making on new infrastructural development was effected through some institutions established during this era. The two pivotal institutions set up during this era were:
The Public Works Department (PWD)
The Nigerian Railway Corporation (NRC)
The PWD was established to plan and develop several infrastructural facilities in Nigeria (roads, electricity, ports and harbours, etc.). The PWD intervened in the establishment of the first electrical power plant in Lagos, which served lighting purposes. This intervention led to increased demand for electricity since this provision led to increased perceived public value for electricity.
The NRC intervened in the planning, surveys and provision of rail transport infrastructure. The NRC was established to plan, implement and maintain rail infrastructure in order to open up the hinterlands of the country and aid the easy transportation of agricultural produce to coastal cities and ports for export. This led to the provision of the first rail line in Nigeria in 1896, linking Lagos and Ibadan, two cities in South-West Nigeria.
Traditional rulers still remained relevant in the scheme of things at the community level [15]. However, colonial rule and institutions were having greater impact in changing the infrastructure and governance landscape [14]. In order to gain acceptance at local community levels, the colonial institutions worked closely with community leaders to ensure decisions made were accepted and implemented at community level.
Changes in energy systems during this era were also influenced by technological interventions. Two forms of technological interventions were evident during this era:
Metallurgical technology
Electrical technology
The extensive use of metallurgy during this era aided the planning and development of several infrastructure. Metallurgical interventions aided the production of farm tools to aid agricultural practices and increase crop production. The provision of the first railway line in Nigeria was also aided by the extensive deployment of metallurgical interventions during this era. These interventions aided the provision of mass transportation infrastructure (such as the railway line).
Electrical technology interventions aided the provision of the first electrical power plant in Nigeria which was used mainly for lighting applications. However, this initial provision paved the way for future electrical technology interventions to cater for future electrical energy needs due to increased demand for other applications, such as, electricity needs for the workshops of the Nigeria Railway Corporation.
During this era, economic considerations were centred on increased trade volume, growth in income and productivity. Policies of the colonial administration at the time were centred on providing infrastructure aimed at economic development that supports trade. These were part of the considerations for the planning and eventual provision of the first railway line and electricity infrastructure in Nigeria.
During the industrial era, there were five vital drivers of energy infrastructure supply. These were:
Technological interventions
Changes in social practices
Policy and institutional interventions
Economic considerations
Energy resource options
During this era, the use of metallurgical and electrical technology interventions in infrastructural provisions became further widespread. New railway infrastructure opened up the hinterlands and connected more towns which aided mass transportation of people and goods. The use of steam engines for transport and manufacturing applications were also evident in this era.
New electricity supply infrastructure was provided to cater for increased electricity demand. The existing steam plants were expanded in response to increased demand. This era also saw the introduction of new technology pathways for electrical energy generation. The discovery of coal in 1909 paved the way for the introduction of coal fired electrical power plants in (Lagos and Enugu) Nigeria. There were also plans during this era which paved the way for future hydroelectric power plants.
The introduction of various technological interventions during this era led to changes in social practices of Nigerians which became dependent on more dense energy sources. Indeed, some of these practices became more energy intensive. The provision of more road and rail infrastructure led to a change in commuting patterns from walking to the use of mass transportation models, such as railway lines. This period also saw a gradual change from mass transportation (in the beginning of the era) to individualized transportation (towards the end of the era). The change in commuting patterns led to increased demand for more transport infrastructure which also had some effects on increased demand for energy infrastructure supply.
This era saw the introduction of several policies, implemented within institutional frameworks, which aided the eventual provision of targeted infrastructure (including energy). This era was dominated by colonial institutions, established to achieve specific infrastructural and policy targets [16]. Two institutions were pivotal in the provision of electricity infrastructure during this era:
Nigerian Electricity Supply Company (NESCO)
Nigerian Government Electricity Undertaking (NGEU)
Established in 1922, the Nigerian Electricity Supply Company (NESCO) was tasked with the responsibility of developing electrical energy supply (generation) infrastructure. NESCO was involved in generation and bulk trading of electricity to different towns and cities such as Bukuru (1936) and Vom (1944), covering a total of 600 square-miles (including the mines). The peak load rose to 12 MW with an annual load factor of 60%. As of 1922, the Enugu building of NESCO was already in place, just off the railway workshops. Engines, dynamos, boilers and a riveted steel chimney were in position at an audited cost of over £103k, which is worth around £4.6m in current estimates. This power plant supplied electrical power to the mines from 1924.
The Nigerian Government Electricity Undertaking (NGEU) was established in 1946 to plan and implement the provision of electricity infrastructure by at least 200%. The aim was to ensure the provision of electricity to support industrialization. The implementation of this policy led to industrialization in the 1950s in Nigeria. Many manufacturing plants based their future growth projections on the electrical infrastructure expansion plans.
Trade activities continued to grow during this era. This was evident by the complex movements of goods over time as highlighted in Table 1. The growth in trade was supported by increased agricultural productivity and the presence of small cottage industries. Table 1 shows the goods tonnage and passenger journeys (1913–1976). Between 1925 and 1930, the movement of coal led to increased trade and commercial activities.
Year | Paying tonnage (‘000) | Non-paying tonnage (‘000) | Total tonnage (‘000) | Passenger journeys (‘000) |
---|---|---|---|---|
1913 | – | – | – | 1160 |
1917 | 152 | 60 | 212 | 1094 |
1920 | – | – | 527 | 2211 |
1924/25 | 541 | 113 | 645 | 1023 |
1928/29 | – | – | – | 3162 |
1932/33 | 646 | 180 | 826 | 2378 |
1935/36 | 709 | 238 | 947 | 7941 |
1936/37 | 892 | 270 | 1162 | 8426 |
1941/42 | 1042 | 266 | 1308 | 4810 |
1943/44 | 1239 | 397 | 1636 | 5245 |
1944/45 | 1339 | 371 | 1710 | 5342 |
1952/53 | 1543 | 543 | 2086 | 5516 |
1953/54 | 1714 | 584 | 2298 | 5454 |
1954/55 | 1983 | 619 | 2602 | 5451 |
1955/56 | 2000 | 653 | 2653 | 6310 |
1958/59 | 2353 | 743 | 3096 | 7015 |
1960/61 | 2054 | 668 | 2722 | 9822 |
1961/62 | 2381 | 622 | 3003 | 11,061 |
1962/63 | 2209 | 551 | 2760 | 12,006 |
1963/64 | 2534 | 436 | 2960 | 11,288 |
1970/71 | 1493 | 111 | 1604 | 8942 |
1975/76 | 1521 | 126 | 1647 | 6755 |
Goods tonnage and passenger journeys in Nigeria (Source: Archives of the Nigerian Railway Cooperation).
The introduction of the new energy policy for the provision of more energy supply infrastructure was based purely on economic considerations, to support industrialization. The Nigerian Government Electricity Undertaking (NGEU) had the responsibility of planning and implementing this policy. Indeed, economic considerations from individuals and government and impacted on more demand for energy which then influenced more electricity infrastructure supply.
During this era, there was a deliberate attempt by the Nigerian government (still under colonial rule) to conduct surveys aimed at exploring and searching for possible mineral reserves. This led to the discovery of coal in 1909.
The discovery of coal changed the electricity and transportation landscape. There was a shift to the use of coal fired power plants for electricity generation due to the availability of coal. The use of coal in cottage industries also increased. The transportation landscape was also affected by the discovery of coal as more locomotives depended on coal as the fuel source.
This era saw some drastic changes in energy infrastructure supply. These were influenced by the following:
Energy resource options
Technological interventions
Policy/institutional interventions
Societal practices and public values
Economic considerations
The discovery of crude oil in commercial quantities in Nigeria in 1958 changed the entire energy landscape during this era. After the Nigerian independence and the civil war, there was a shift in the use of fuel from the use of coal to a greater dependence on natural gas and crude oil (and its by-products) for electricity generation and other industrial uses. Indeed, there were more options to choose from between coal, natural gas and crude oil. This era also saw the development of dams for hydroelectric power generation.
During this era, dynamos and internal combustion engines played a key role as the major technology driver of changes in energy infrastructure supply. The extensive use of internal combustion engines for vehicles and road transportation impacted on fuel sources. This also led to extensive investment in road infrastructure and a gradual decline in the use of rail transport infrastructure.
During this era, new technological pathways were adopted for electrical energy generation. Extensive development of hydroelectric and thermal power plants was evidenced in this era. This era also saw a swift decline in the use of coal for electrical power generation and the retiring of several coal-fired power plants.
This era saw the extensive use of policy and institutional frameworks as intervention tools in addressing issues of energy infrastructure supply. The rising energy demand after the Second World War led to increased electrical infrastructure supply constraints. As such, the government intervened by carving out a new unit off the Public Works Department called the Nigerian Government Electricity Undertaking (NGEU). The NGEU was established in 1946 as an entity that will metamorphose into a future corporation with the aim of preparing and implementing a plan that can aid the provision of more electricity infrastructure to aid industrialization. Indeed, the NGEU prepared a 10-year plan covering the period 1946–1956 with the aim of increasing electricity infrastructure provision by at least 200% to support industrialization.
Another important institution is the Electricity Corporation of Nigeria (ECN). The ECN was established on 6th July 1950 and was charged with the task of developing Nigeria’s electricity potential in a manner as to provide cheap and affordable sources of energy in a consistent and sustainable way.
The beginning of this era saw the gradual handover of institutions under colonial control as the country prepared for independence (which took place on 1st October 1960) [17]. Series of military coups and counter coups experienced a few years after the independence led to instructional instability, highly militarized decision making structure, and less attention and adherence to laid down policy plans and processes [18, 19].
The Niger Dams Authority (NDA) was established in 1962 to develop Nigeria’s hydropower potential. This paved the way for the development of hydroelectric power infrastructure in Nigeria with the building of several dams for irrigation, water supply and electricity generation.
The National Electric Power Authority (NEPA) was established in 1st April 1972 which is a product of the merger of the Niger Dams Authority (NDA) and the Electricity Corporation of Nigeria (ECN). The merger actually took effect from 6th January 1973. The NEPA was a public company, owned and managed by the Nigerian government. All through this era, NEPA had responsibility for the provision, operation and maintenance of electricity infrastructure in Nigeria.
The Nigerian National Petroleum Corporation (NNPC) established on 1st April 1977 to participate and regulate Nigeria’s petroleum industry. The role of the NNPC in regulating activities of players in the oil and gas sector had direct impact on electricity infrastructure provision since fuels required to power the electrical power plants depended on the dynamics of the downstream oil and gas sector.
In 1979, an act of government (which was later amended in 1988 and 1989) established the Energy Commission of Nigeria (ECN). The ECN was charged with the responsibility of coordinating and strategically planning the national energy policies. The ECN have focused on developing actions plans that aids in addressing the Nigeria’s energy challenges through establishing and implementing policies. Indeed, since its establishment, the ECN still has a huge gap to fill.
In this era, there were swift changes with regards to social practices which impacted on energy demand and consumption. The public value for energy services was on the rise and energy was highly perceived as a public good. Education played a vital role in the changes in social practices and perceived public values for energy. There was an increase in the number of educational institutions at primary, secondary and tertiary levels. Educational institutions also needed energy for teaching and research.
With regards to commuting, there was a change in commuting patterns from mass transportation to individualized transportation. More people had their private vehicles for personal and business purposes. Aside the reasons of comfort and convenience, a major driver of change from mass transportation to individualized transportation were increased concern for security and safety. There were also changes in lifestyles and leisure that impacted on the energy consumption and use that leads to increased need demand for energy supply infrastructure.
Rapid population growth, migration and urbanization also impacted on changes in practices. Some towns and cities ended up becoming more cosmopolitan (such as Lagos). Multiplicity of diverse practices within cities, aided by migration and population growth, impacted on changes and provision of infrastructure for commuting (transport), leisure (recreation), learning (education), trading (commerce), etc. These practices impacted on energy use and increased demand for energy infrastructure supply.
This period saw changes in trade and investment dynamics. The discovery of more natural resources paved the way for further trade activities and other economic considerations investments. Crude oil export started in the 1970s. Export of agricultural produce continued but at a reduced rate due to a shift in attention from agriculture to crude oil as the major income earner for the country. The produce that was now exported (crude oil) required a lot of energy for its exploration and production.
There was an increase in manufacturing activities during this era. Increased electricity requirements for industries posed a greater challenge with regards to electricity supply infrastructure. Inadequate supply during the latter part of this era impacted on many manufacturing and cottage industries. Industrial growth was pegged as a result of inadequate electricity supply infrastructure. Most industries opted for self-generation of electricity for their industrial needs. Indeed, this infrastructure deficit resulted in the need for planning and future provision of more electricity supply infrastructure.
During this era, four major drivers of energy systems change were noticeable:
Technological interventions
Policy and institutional interventions
Societal practices and public values
Economic considerations
During this era, the use of microprocessor technology was on the rise which impacted on automation of processes in different sectors. In manufacturing, microprocessor technology aided the automation of many industrial processes. The use of Programmable Logic Controllers (PLCs), industrial sensors and other related technologies in manufacturing depended on microprocessor technology. The automation of several industrial processes aided increased production of goods. Even though there was more attention on energy efficiency and energy conservation measures, the introduction of these new technologies in manufacturing also impacted on electricity demand as more industries opted for automation to improve productivity.
This era is characterized by democratic and civil institutions involved in the decision-making and policy process [17]. At the start of this era, two institutions emerged:
Power Holding Company of Nigeria (PHCN).
Nigerian Electricity Regulatory Commission (NERC)
Owing to inefficiencies in the Nigerian electricity sector, the Nigerian government started a process of unbundling the National Electric Power Authority (NEPA) in order to reduce government bureaucratic process in electricity supply infrastructure provision, operation and maintenance. The PHCN was established on 5th May 2005 as a holding company, owning the various divisions responsible for generation, transmission and distribution of electrical energy. This paved the way for the future privatization of the PHCN, with transfer and controls of some national electrical power assets by private companies. The privatization process also brought about some changes in models of electricity financing, operation and maintenance.
The NERC was established on 31st October 2007 as a regulatory body for the Nigerian power industry. The NERC has the responsibility for issuance of licenses and permits to market participants in the Nigerian electricity sector. They also ensure compliance to rules and regulatory guidelines in the Nigerian electricity sector.
This era saw lots of private investments in the provision of infrastructure to satisfy the increased demand for convenience and comfort. This was evidenced in the emergence of shopping malls, cinemas, nature reserves and parks. The emergence of these infrastructure posed more pressure on demand for energy. This era continued to experience increased migration and urbanization which posed some infrastructure challenges (including energy). Indeed, in this era, the public value for energy services had increased and people had more dependence on energy to fulfill and accomplish several social practices.
In this era, the need for increased productivity led to the embrace of automation in the industrial and manufacturing sector. Economic consideration during this era was characterized by the need to address both internal (local) and external (export) demand for certain products. Indeed, this led to more manufacturing activities. Most industrial players had to invest in electrical generation plants to satisfy their electricity needs. Self-generation of electricity also impacted on cost of finished goods as some companies could not measure up to the economies of scale for increased production output.
In Nigeria, a very important aspect of the governance of energy and electricity infrastructure provision is the individual interest of policy actors, the individualistic nature of which further emphasizes the need to incorporate economic and social psychological thinking. Some underlying questions they ask themselves before deciding on what type of energy infrastructure to provide include:
How much does this infrastructure cost? Can our current budget accommodate it?
How long will it take to deploy this infrastructure? Is it something that I can commission before leaving office?
What social and political benefits will the provision of this infrastructure confer (on me and the populace)? Will the provision of this infrastructure offer me the possibility of acceptance and possible re-election by the populace?
Indeed, these aforementioned questions are crucial for individual actors within policy frameworks in taking decisions [20]. These also impacts on the governance of energy. This is in contrast with one of the arguments of Kuzemko et al. [21] who asserts that in governing sustainable energy systems change, innovation is important in sustainable energy transitions. In Nigeria, political actor interests are a major driver of energy transitions. The practice of policy making, intertwined with the interests of the political actors, is the principal driver of energy transitions. This is supported by the argument that linking governance with practices and outcomes, and defining energy and climate actor groups are very important in governing changes in energy supply infrastructure in a sustainable way [21, 22].
In Nigeria, institutional (government) interventions, changes in policy direction and new technology pathways constituted major drivers of changes in Nigeria’s electricity systems. There are similar trajectories between the energy transitions dynamics of the Nigerian and the Dutch system. In considering the dynamics of the energy transitions in the Dutch electricity systems (1960–2004), Verbong argues that: changing perceptions and goals (1960–1973); direct government interventions (1973–1989); and major changes in rules, network and technology (1989–2004) characterized the Dutch electricity sector [23]. The Dutch system compares with that of Nigeria because electricity infrastructure provisions were influenced by: changing perceptions and goals prior to Nigeria’s independence in 1960 (1890–1960) with evidence in changing technology and fuel sources for electricity generation during that period; direct government interventions (1940–1970), an example was the intervention by the then Nigerian Government Electricity Undertaking (NGEU) in 1946 to provide new electricity infrastructure by 200% in a space of 10-years [24]; and major changes in rules (2005–2015), characterized by the new electrical power sector reforms roadmap [25].
The following sub-sections discuss further four important influences of politics, technology, energy sources and geographies of energy on energy systems change in Nigeria.
Politics play a major role in effecting changes in energy supply infrastructure. For instance, the politics around crude oil and natural gas production and trade is vital for guaranteeing continuity of supply of electrical energy since most electrical power plants depends on the oil and gas sector for fuel to fire the power plants. This means fuel supply (in the forms of liquid fuel and natural gas) for most electrical power plants are highly dependent on the production, market, economics and political dynamics around crude oil and natural gas supply [26].
Arguably, the gas market is a lot more rigid than the oil market. This is because it requires large and expensive investments to ensure the easy transportation of gas around the world. Investing resources in a lot of long term infrastructure for this sort of business requires that there is a good (long term) political relationship with the trade partners, wherever they may be. Indeed, it is easier to get entangled in the global prospect for natural gas, which can lead to a lot of energy security issues, both domestically and internationally.
Looking into the future, the major factor that could either make or break (clean) energy production is policy. This is the topmost variable because: policy plays a major role with respect to investment direction for most investors; it impacts on changes on the supply side of energy systems and infrastructure through definition of standards; and it imposes considerable changes in energy demand patterns and behaviours.
Within the Nigerian context, a major factor that led to the displacement of coal with liquid fuel and natural gas for electricity generation was simply the economics of natural gas over coal. Coal production and use for electricity generation in Nigeria is more expensive than the use of liquid fuels and natural gas. This transition started happening in the 1950s, but became more entrenched from the 1970s. All the coal fired power plants in Nigeria built from the 1920s to the 1950s have all been retired. Indeed, natural gas will gain a lot more grounds in Nigeria in the coming years due to its availability and the policy direction of the government encouraging the use of natural gas for electricity production.
In Nigeria, there have been lots of changes in energy technology and use over time. This will continue going into the future. Historically, Nigeria has transited from the use of steam engines, to coal-fired technology, thermal power plants and renewables. Going into the future, there will be more changes which will be shaped by the changing nature and politics of electricity infrastructure provision.
In recent times, there has been a rise in the deployment of decentralized off-grid solar solutions in Nigeria. The rapid rise of renewables will continue and solar power will become a regular feature on the energy landscape. New technologies will support global deployment of wind farms and solar solutions. The rise in renewable solutions needed for a clean energy future will be driven more by the increase in energy demand for electricity. Incorporating these renewable technologies will also have impact on the traditional electricity grid as new hybrid grids (transmitting electricity over long distance) and micro grids (playing strategic role in electricity distribution and providing flexibility) will be the mainstream technologies in the future.
As is now being experienced in major urban centres in Nigeria, buildings are now producing electricity through roof top solar solutions. In the future, more buildings will produce energy rather than consume energy. Buildings will also function as energy hubs in the future, offering the entire energy system more flexibility and also ensuring stability of the electricity grid. The use of smart meters, greater energy storage capacity and low cost solar cells will be important technology catalysts of a cleaner electricity future.
Energy sources play a vital role in energy systems change. In Nigeria, it all started with the use of steam engines for electricity generation. The discovery of coal as an energy source (in 1909) changed the energy infrastructure landscape, leading to a switch from the use of steam engines to the adoption of coal-fired power plants. The need to diversify the electricity infrastructure mix led to the development of hydropower plants in Nigeria (with the formation of the Niger Dams Authority). The discovery of crude-oil in commercial quantities (in 1956) had a considerable impact on the electricity infrastructure landscape in Nigeria. The overriding economics of crude oil and natural gas over coal led to a shift to the use of (oil and gas-fired) thermal power plants. Increased demand and consumption of energy in Nigeria have been partly influenced by the availability of energy resources. Figure 2 shows the Nigerian energy flow linking primary energy resources to end-use sectors.
The Nigerian energy flow ([
Energy flow in society starts with the natural energy sources (such as coal and crude oil) which are then converted into different usable forms that society consumes. These usable forms of energy materializes through the services they render society (as evident in Figure 2). This is evident through the greater use of energy resources, driven by the need for comfort and more productivity. In Nigeria, the increased societal use of energy resources is impacted by three main sectors: building; manufacturing; and transportation sectors.
Aside technological interventions, politics and energy resources, a major driver of energy systems change in Nigeria are the ‘geographies of energy’ which encapsulates the social, cultural and political dimensions of energy production and consumption. The geographies of energy also considers how territorial, locational and spatial landscape impacts on (and co-constitutes) energy processes.
The geographies of energy played a very important role in Nigeria’s energy transitions and infrastructure provision. Prior to Nigeria’s independence in 1960, developmental infrastructure projects and provision were centred on regions. Starting with steam powered generation plants in the late 1800s, the discovery of coal in 1909 paved the way for many coal-fired electricity generation plants (mostly around the regions where coal reserves were available). Lagos was the only exception. This was largely because there was already rail infrastructure connecting some parts of eastern Nigeria (Enugu) to Lagos where coal could be easily transported via rail to the power plant in Lagos. Figure 3 shows a map of the geopolitical zones in Nigeria.
Map of the geo-political zones in Nigeria (Source:
Most crude oil and natural gas resources are concentrated around the South-South and South-East zones of Nigeria. These zones also have a higher concentration of: electricity power plants; natural gas refineries and export terminals; and crude oil refineries and export terminals. Indeed, these zones have the highest concentration of energy production and electricity generation infrastructure in Nigeria. However, for political reasons, government infrastructure decisions have also favoured setting up crude oil refineries outside the zones where the resources are. An example is the crude oil refinery located in Kaduna, North-Central Nigeria. The natural crude had to be transported to the refineries via pipelines. Indeed, political decisions of this sort has created historical tensions among socio-political groups in the geographies where the natural resources are domicile (and beyond), leading to cases of pipeline vandalism, political actions and other forms of externalities which impacts on the energy infrastructure landscape and energy security.
The Nigerian historical energy transition with respect to the evolution of energy infrastructure provisions was investigated. The dominant drivers of electricity infrastructure supply within each energy era in Nigeria were also investigated. These drivers, which comprises technological interventions and pathways, institutional interventions, social practices and public values, energy resources and other economic considerations, played an important role in the governance and provision of historical electricity supply infrastructure in Nigeria.
A complex connection between resources, trade, institutions and political structures existed. These complexities were further aggravated by the creation of several decision making institutions within each energy era, as well as the policy direction of the government. Decisions by these (public) institutions led to serial changes, and eventual transition, in the use of different primary energy resources (coal, crude oil, natural gas) to satisfy the growing demand for energy. It also reveals that the increased use of primary energy resources were primarily influenced by the availability of those resources, while the growing demand served as a secondary reason.
This chapter presents the need for a greater understanding of the motives and objectives of energy systems supply. What exactly motivates the changes in the energy sector in a given country as against the background of the overall energy demand and supply situation? Possible motives, such as competitiveness, public acceptance, energy security and environmental concerns—within institutional contexts and policy frameworks—needs to be investigated at country levels, for a better understanding of the key drivers of energy transitions within countries.
There is a need to understand the drivers and governance of changes in the respective energy sectors. How are changes promoted in the energy sector? Some possible drivers, such as: technological innovation, government policies, etc., needs to be investigated at country level to ascertain their impact on the institutional structures and frameworks of energy policy governance.
The study of Nigeria’s energy transitions presents some policy implications. Since energy infrastructure choices contribute to environmental problems, and changing these energy infrastructure choices requires adequate knowledge of their effects and consequences, there is need for a wide range of changes in energy policies and energy systems to help address these problems. Energy users, including policy makers, generally prefer energy policies that is perceived to have more benefits and less cost. However, since energy infrastructure provision is primarily a political choice, the acceptance of different energy policies (and changes in energy supply systems) is influenced by institutional actors within institutions through institutional values, workings and frameworks responsible for energy infrastructure decisions and choices.
Energy production, distribution and supply are very complex matters. This complexity is evident when viewed with respect to the role of technology, energy resources and geographies of energy in effecting changes in energy supply systems. This implies reliance on parties, such as: energy companies, scientists, non-governmental organizations and policy makers. How much people trust these parties will influence the acceptability of energy policies. Knowledge and understanding of Nigeria’s energy past can surely shape current and future decisions. Short term energy decisions have to be put in perspective with the longer term visions in order to limit the effects of unintended consequences.
Bacteria, fungi (yeasts and molds), mycobacteria, prions, protozoa, and viruses are common pathogens infecting humans and animals. They typically exist within the host or in the environment. It has been observed that these microorganisms exhibit a notable difference in the natural survivability in the environment, as well as susceptibility to chemical and physical inactivation. For example, under ambient and dried conditions, human coronaviruses seem to lose their infectivity in a matter of several hours to several days [1], whereas endospores and prions may remain infectious for years to decades or even indefinitely [2, 3].
As more and more data have become available regarding the survivability and susceptibility of pathogens to microbicides, it has been observed that the pathogens seem to demonstrate an order of susceptibility to chemical and physical inactivation. E. H. Spaulding first proposed a classification system for the sterilization and disinfection of medical instruments based on the infection risk in 1939 [4]. On the basis of this classification, the concept of a hierarchy of pathogen susceptibility was proposed, in which microorganisms are placed into several groups and ranked from least susceptible to most susceptible. In this hierarchy concept, bacterial spores were ranked the least susceptible, followed by mycobacteria, non-enveloped viruses, fungi, vegetative bacteria, and enveloped viruses. The susceptibility hierarchy was also believed to be related to the biochemical and biophysical characteristics of a pathogen [5, 6].
This hierarchy concept has been slightly modified and expanded over the years. For example, prions were added and considered less susceptible to inactivation by microbicides than bacterial spores; small non-enveloped viruses were considered less susceptible than large non-enveloped viruses; and the order between mycobacteria and small non-enveloped viruses was sometimes reversed (Figure 1) [7, 8, 9, 10]. Additionally, it has been suggested that the hierarchy concept may be applied either “vertically” (i.e., ranking of susceptibility
Proposed hierarchy of susceptibility of pathogens to microbicides. Note: slightly different versions of the hierarchy concept have been proposed in the literature. Mycobacteria have been placed above small non-enveloped viruses, and molds have been placed above large non-enveloped viruses in certain versions. In some versions, the small and large non-enveloped viruses are combined; and yeasts and molds may be combined.
The hierarchy concept has been quite useful for enabling scientists to better understand the innate difference among various types of pathogens. In the case of newly emerged pathogens, especially, the hierarchy concept has helped stakeholders design and implement a disinfection strategy swiftly with a reasonable level of confidence. The concept also helps the contaminant control for food, pharmaceutical, and biopharmaceutical products, as it is impractical to test every possible contaminating pathogen, and a robust infectivity assay system may be lacking for certain pathogens (e.g., hepatitis E virus).
Despite its usefulness, the hierarchy concept should be interpreted with caution, as it may oversimply the differences and trending of pathogen susceptibilities. Further examination and refinement of the concept may be necessary; and several important questions should be answered. For example, how often do exceptions to the hierarchy occur and what are the underlying reasons? Could a trending be specific to a given type of chemistry? Is the hierarchy the same between susceptibility to both chemical and physical inactivation? Why do pathogens in the same group, or even the same family or genus, sometimes exhibit striking differences in susceptibility? Is there a way to identify and separate reliable/consistent trending versus blurred/variable trending? A deeper look at the efficacy data for various types of microbicidal actives, especially for non-enveloped viruses, may help stakeholders understand the scope, reliability, and limitation of the hierarchy concept so that it can be best utilized.
This chapter reviews the inactivation efficacy data from the literature against non-enveloped viruses for several commonly used types of chemistries, either in formulated or unformulated form, in an effort to generate a separate relative order of susceptibility among these non-enveloped viruses for each type of chemistry and to differentiate consistent versus variable trending. Physical inactivation approaches are not covered in this chapter, although a significant degree of variation also exists for physical treatments. It is not clear that the physical inactivation approaches, in general, are governed by the same hierarchy to susceptibility as is observed for chemical inactivation approaches [12].
Currently, there are a total of 21 families of viruses (including enveloped and non-enveloped) identified for humans [13], which represent only a small part of the entire paradigm of viruses in nature, whose host ranges extend from vertebrates to plants to bacteria. The most common families of non-enveloped viruses for humans and animals include
Family | Example virus | Abbreviation | Genus | Genome | Size (nm) |
---|---|---|---|---|---|
Adenovirus type 2 | AdV-2 | ds DNA | 70–90 | ||
Adenovirus type 5 | AdV-5 | ds DNA | 70–90 | ||
Adenovirus type 8 | AdV-8 | ds DNA | 70–90 | ||
Human astrovirus | HAstV | ss RNA | 28–35 | ||
Feline calicivirus | FCV | ss RNA | 28–40 | ||
Human norovirus | HuNoV | ss RNA | 28–40 | ||
Murine norovirus | MNV | ss RNA | 28–40 | ||
Tulane virus | TuV | ss RNA | 28–40 | ||
Porcine circovirus | PCV | ss DNA | ∼17 | ||
Hepatitis E virus | HEV | ss DNA | 32–34 | ||
Human papillomavirus | HPV | ds DNA | 50–60 | ||
Bovine parvovirus | BPV | ss DNA | 20–28 | ||
Canine parvovirus | CPV | ss DNA | 20–25 | ||
Human parvovirus B19 | B19V | ss DNA | 23–26 | ||
Minute virus of mice | MVM (MMV) | ss DNA | 20–25 | ||
Porcine parvovirus | PPV | ss DNA | 20–25 | ||
Bovine enterovirus | BEV | ss RNA | 30–32 | ||
Coxsackievirus | Cox | ss RNA | 30–32 | ||
Echovirus 11 | Echo11 | ss RNA | 30–32 | ||
Encephalomyocarditis virus | EMCV | ss RNA | 30–32 | ||
Enterovirus 71 | EV-71 | ss RNA | 30–32 | ||
Enterovirus D68 | EV-D68 | ss RNA | 30–32 | ||
Foot and mouth disease virus | FMDV | ss RNA | 30–32 | ||
Hepatitis A virus | HAV | ss RNA | 30–32 | ||
Poliovirus type 1 | PV1 | ss RNA | 30–32 | ||
Rhinovirus | RV | ss RNA | 30–32 | ||
Seneca Valley virus | SVV | ss RNA | 30–32 | ||
Bovine polyomavirus | BPyV | ds DNA | 40–50 | ||
Simian virus 40 | SV40 | ds DNA | 40–50 | ||
Bluetongue virus | BTV | ds RNA | 60–80 | ||
Reovirus type 3 | REO-3 | ds RNA | 60–80 | ||
Rotavirus | Rota | ds RNA | 60–80 |
Common families of human and animal non-enveloped viruses.
Among these, the
It is worth noting that viruses are typically classified taxonomically on the basis of virion properties (size, shape, envelope, physical, and chemical properties, etc.), genome organization, replication mechanism, antigenic properties, and biological properties [13, 14, 15]. The final classification is a combined consideration of these properties. However, the stability and susceptibility to inactivation of a virus may not relate to all of these properties and, as such, may not always align with the taxonomic classification system. For example, the susceptibility of a virus to surfactants may primarily be related to the envelope of the virion and not related to the genome structure or mode of replication.
The susceptibilities of non-enveloped viruses to chemicals have been found to be highly variable and somewhat hard to predict, since they do not always agree with the hierarchy concept. For example, according to the hierarchy concept as modified by Sattar [8], small non-enveloped viruses should be less susceptible than large non-enveloped viruses. Additionally, if there is a fixed hierarchy, all small non-enveloped viruses should either display similar levels of susceptibility or should demonstrate a definitive trend of relative susceptibility, regardless of the type of microbicide. Based on the literature, neither of these predictions appear to hold in every case. The relative order of susceptibility seems chemistry-dependent; and sometimes viruses within the same family or even genus have been found to exhibit unequivocal differences in their susceptibilities (reviewed in [16]). Any trending or hierarchy, therefore, must be reviewed in the context of the type of chemistry, and it should not be assumed that non-enveloped viruses within the same family or genus will always display similar susceptibilities to a given microbicide.
Viral inactivation may be achieved by chemical and/or physical methods. The subset of chemicals commonly used for inactivation of non-enveloped viruses includes alcohols, oxidizers, halogen compounds, quaternary ammonium compounds, phenolics, aldehydes, acids, and alkalines [17, 18, 19]. These differ with respect to efficacy, stability, toxicity, material or surface compatibility, cost, and sensitivity to organic soil load. Soil load is a term used to signify an organic matrix used to challenge the inactivating efficacy of a microbicide. It is intended to mimic secretions or excretions in which the virus would be released from an infected person or animal. Some chemistries (e.g., sodium hypochlorite, phenolics, and aldehydes) are mostly used for environmental or medical device disinfection. Other chemistries (e.g., ethanol) are more commonly used for hand hygiene, while some others (e.g., quaternary ammonium compounds) may be used for both environmental disinfection and skin antisepsis (Table 2).
Class | Chemical | Typical conc. | Usage | Mechanism of viral inactivation | Sensitivity to soil load |
---|---|---|---|---|---|
Alcohols | Ethanol | 50–95% | Disinfection; Antisepsis | Protein denaturation | + |
Isopropanol | 70–90% | Disinfection | Protein denaturation | + | |
Oxidizers | Sodium hypochlorite | 0.01–0.5% | Disinfection | Protein/genome damage | ++ |
Chlorine dioxide | 0.1–1 mg/L | Disinfection; Water treatment | Protein/genome damage | — | |
Hydrogen peroxide | 0.1–10% | Disinfection; Antisepsis | Lipid/protein/genome damage | + | |
Hypochlorous acid | 0.002–0.1% | Disinfection; Water treatment | Protein/genome damage | ++ | |
Peracetic acid | 0.01–1% | Disinfection; Sterilization | Protein denaturation | — | |
Povidone-iodine | 0.02–8% | Disinfection; Antisepsis | Protein/genome damage | ++ | |
Chlorohexidine | 0.02–0.2% | Antisepsis | Protein denaturation | + | |
QAC | BKC, DDAC, etc. | 0.01–0.2% | Disinfection | Lipid/protein damage | + |
Low pH | Acids | ≤ pH 4 | Sanitization; Biomanufacturing | Capsid/protein damage | — |
High pH | NaOH, etc. | ≥ pH 10 | Disinfection; Tissue processing | Capsid/genome damage | — |
Aldehydes | Glutaraldehyde | 0.02–2% | HLD; Sterilization | Crosslinking/protein & genome damage | — |
Formaldehyde | 0.1–5% | Disinfection/Preservation | Alkylating/protein & genome damage | — | |
OPA | 0.02–2% | HLD; Sterilization | Crosslinking/protein damage | — | |
Phenolics | Phenylphenol, etc. | 0.05–5% | Disinfection | Protein damage | — |
Common types of chemistries used for non-enveloped viral inactivation.
Abbreviations used: BKC, benzalkonium chloride; Conc, concentration; DDAC, didecyldimethylammonium chloride; HLD, high-level disinfection; NaOH, sodium hydroxide; OPA, ortho-phthaldehyde; QAC, quaternary ammonium compounds.
The virucidal efficacy of a product is not only determined by the type and concentration of the chemical, but is also heavily influenced by the formulation, pH, exposure (contact or dwell) time, organic soil load, temperature, and surface characteristics (as applicable), etc. [10, 20, 21, 22]. Given the differences between various testing methods, as well as the intrinsic variability of viral infectivity (titration) assays, a general conclusion on the efficacy of a particular type of active ingredient will be enhanced if the efficacy is derived from multiple sets of data and under various application conditions (such as the concentration of the microbicidal active(s), contact time, formulation matrix (as applicable), and organic soil load, etc.) Additionally, in order best to explore the relative ranking of susceptibility between viruses, or the lack thereof, efficacy data from side-by-side studies wherein the same test methodologies and conditions were used would be preferable. Care should be taken when comparing data from different studies, especially if the formulations, test methods, and test conditions were different.
Alcohols, primarily ethanol and isopropanol, are widely used for hand hygiene and environmental disinfection, and their efficacies against bacteria and viruses have been extensively studied [23, 24, 25]. Ethanol at a concentration of 70–90% and isopropanol at 70% have been broadly shown to be effective against enveloped viruses; however, their efficacies against non-enveloped viruses are much more variable.
The trending of the degree of susceptibility of non-enveloped viruses to ethanol and isopropanol is generally clearer and more consistent than it is for many other types of chemistries, thanks to the large amount of data in the literature. The relative ranking of susceptibility of non-enveloped viruses seems to differ between ethanol and isopropanol; and the ranking does not appear to align well with the classical virological taxonomy.
For ethanol, parvoviruses and the polyomavirus simian virus 40 have low susceptibility, while rotavirus (a reovirus) is susceptible (Table 3). Viruses in the
Virusa | Method | Soil/Matrixb | Log10 Reduction after | References | |||
---|---|---|---|---|---|---|---|
30 s | 1 min | 5 min | 10 min | ||||
PPV | Stainless steel | Erythrocytes + BSA | 0.3 | 0.6 | [26] | ||
MVM | Stainless steel | Erythrocytes + BSA | 0.3 | 0.7 | [26] | ||
HEV71 | Suspension test | Medium | < 1 | [27] | |||
HAV | Suspension test | Medium | 0.4 | [28] | |||
HAV | Suspension test | 20% fecal | 0.4 | [28] | |||
HuNoV | Suspension test | 20% stool | <0.5 | [29] | |||
TuV | Suspension test | Medium | <0.5 | [30] | |||
PV1 | Suspension test | 20% fecal | 0.3 | [28] | |||
PV1 | Suspension test | Medium | 0.4 | [31] | |||
PV1 | Glass | Medium | 2.3 | 1.0 | 5.0 | [31] | |
PV1 | Stainless steel | Erythrocytes + BSA | 2.1 | 1.8 | [26] | ||
PV1 | Suspension test | Medium | 4 | [28] | |||
FCV | Suspension test | Medium | 1.7 | 2.2 | [30] | ||
AdV-8 | Suspension test | Medium | 1.9 | [33] | |||
AdV-5 | Stainless steel | Erythrocytes + BSA | 2.4 | >4.1 | [26] | ||
AdV-5 | Stainless steel | Medium | ∼5 | [34] | |||
MNV | Suspension test | Medium | 5 | [30] | |||
Rotavirus | Suspension test | Medium | > 3.1 | [28] | |||
CPV | Stainless steel | Medium | 0.1 | [36] | |||
SV40 | Suspension test | Medium | <1 | [37] | |||
PV1 | Glass | Medium | 2.9 | 2.9 | 5.4 | [31] | |
TuV | Suspension test | Medium | <0.5 | [30] | |||
FCV | Suspension test | Medium | <0.5 | [30] | |||
HEV71 | Suspension test | Medium | <1 | [27] | |||
PV1 | Suspension test | medium | <1 | [37] | |||
PV1 | Glass | Medium | 1.2 | 1.3 | 1.0 | [31] | |
AdV-5 | Stainless steel | Medium | ∼1 | [34] | |||
AdV-8 | Suspension test | Medium | 2.0 | [33] | |||
MNV | Suspension test | Medium | 1.8 | 3.1 | [30] | ||
SV40 | Suspension test | Medium | >4 | [37] | |||
Rotavirus | Suspension test | Medium | > 4 | [42] |
Efficacy of alcohols against non-enveloped viruses.
See Table 1 for abbreviations used for viruses.
BSA, bovine serum albumin; medium, culture medium; RT, room temperature.
Entries in purple font indicate results from undiluted or diluted formulations with the indicated microbicidal active ingredients.
Interestingly, the above order of susceptibility does not appear to hold the same for isopropanol (Table 3). For example, the polyomavirus simian virus 40 is much more susceptible to isopropanol than many other non-enveloped viruses; and poliovirus appears to display a lower susceptibility, similar to that of hepatitis A virus and human enterovirus 71. Murine norovirus is still more susceptible than feline calicivirus to isopropanol, but not as susceptible as simian virus 40 or rotavirus. The apparent difference between adenovirus 5 and adenovirus 8 that has been observed for ethanol has not been observed for isopropanol.
An oxidizer or oxidizing agent is a chemical that has the ability to oxidize other molecules, i.e., to accept their electrons. Common oxidizing agents used for disinfection, sterilization, or antisepsis include hydrogen peroxide, peracetic acid, ozone, and halogen-containing compounds such as sodium hypochlorite (bleach), hypochlorous acid, povidone-iodine, chlorohexidine, and chlorine dioxide, etc. These compounds can react with and alter the proteins and nucleic acids of non-enveloped viruses and render them noninfectious. Oxidizers comprise a large group of chemicals, and the relative order of susceptibility of non-enveloped viruses to oxidizers seems to vary by specific type of active ingredient (Table 4).
Virusa | Method | Soil/Matrixb | Log10 Reduction after | References | |||
---|---|---|---|---|---|---|---|
≤ 1 min | 2 min | 5 min | 10 min | ||||
FCV | Suspension test | Medium | 3 | [29] | |||
FCV | Suspension test | 20% stool | 0.5 | [29] | |||
MNV | Suspension test | Medium | 3 | [29] | |||
MNV | Suspension test | 20% stool | 0.0 | [29] | |||
CPV | Stainless steel | 90% plasma | < 1 | [43] | |||
CPV | Stainless steel | 5% serum | 5 | [43] | |||
HAV | Stainless steel | 5% serum | 5 | [43] | |||
HAV | Stainless steel | 90% plasma | <1 | 5 | [43] | ||
HAV | Suspension test | PBS/20% fecal | 4 | [28] | |||
PV1 | Suspension test | PBS/20% fecal | 4 | [28] | |||
PPV | Stainless steel | Erythrocytes + BSA | 0.6 | 1.0 | [26] | ||
MVM | Stainless steel | Erythrocytes + BSA | 3.0 | 4.4 | [26] | ||
PV1 | Stainless steel | Erythrocytes + BSA | 2.8 | 4.5 | [26] | ||
AdV-5 | Stainless steel | Erythrocytes + BSA | 4 | [26] | |||
PV1 | Glass | Medium | 0.4 | 0.9 | [16] | ||
RV14 | Glass | Medium | >4.9 | [16] | |||
PPV | Stainless steel | Erythrocytes + BSA | 0.5 | [26] | |||
MVM | Stainless steel | Erythrocytes + BSA | 1.5 | [26] | |||
PV1 | Stainless steel | Erythrocytes + BSA | 3.9 | [26] | |||
AdV-5 | Stainless steel | Erythrocytes + BSA | 2.3 | [26] | |||
MNV | Suspension test | Medium | ∼3 | [52] | |||
HAV | Suspension test | Medium | ∼3 | [53] | |||
PV | Suspension test | Medium | >3 | [53] | |||
CPV | Stainless steel | BSA | 1.6 | [34] | |||
MVM | Stainless steel | BSA | 2.3-2.9 | [34] | |||
PPV | Stainless steel | BSA | 3.8-5.5 | [34] | |||
AdV-5 | Stainless steel | BSA | 4.9-5.8 | [34] |
Efficacy of oxidizers against non-enveloped viruses.
See Table 1 for abbreviations used for viruses.
BSA, bovine serum albumin; PBS, phosphate buffered saline; medium, culture medium; RT, room temperature.
Viral-inoculated lettuce was washed with PAA solution for a defined period of time.
Entries in purple font indicate results from undiluted original or diluted formulations with microbicidal active ingredients.
Parvoviruses are generally among the least susceptible viruses to various types of oxidizers, including sodium hypochlorite, hydrogen peroxide, and peracetic acid. However, for sodium hypochlorite, minute virus of mice appears to be more susceptible than porcine parvovirus and canine parvovirus. All picornaviruses appear to exhibit a similar degree of susceptibility to sodium hypochlorite; but within the family of
The trending for hydrogen peroxide seems more complex than that for sodium hypochlorite. For example, there seems a higher level of variability within the
For peracetic acid, hepatitis A virus also seems less susceptible than poliovirus. Both feline calicivirus and murine norovirus are susceptible to peracetic acid and so is adenovirus.
Quaternary ammonium compounds (QAC) are widely used as active ingredients for disinfectants. Among the advantages of QAC are good stability, dual function of disinfection and cleaning, surface activity, low toxicity, and lack of odor, etc. The potential limitation in the microbicidal efficacy and possible effect in promoting antimicrobial resistance of QAC have also been discussed in the literature [54, 55].
Quaternary ammonium compounds are generally efficacious on most vegetative bacteria and enveloped viruses. Their efficacies against non-enveloped viruses, however, are generally much weaker. Nevertheless, several non-enveloped viruses, such as rotavirus, rhinovirus, and coxsackievirus A11, have been shown to be susceptible to QAC. The susceptibility levels among the
Virusa | Method | Soil/matrixb | Log10 reduction after | References | |||
---|---|---|---|---|---|---|---|
30 s | 1 min | 10 min | 60 min | ||||
PPV | Stainless steel | Erythrocytes + BSA | 0.4 | [26] | |||
MVM | Stainless steel | Erythrocytes + BSA | 0.5 | [26] | |||
PV1 | Stainless steel | Erythrocytes + BSA | 0.5 | [26] | |||
AdV-5 | Stainless steel | Erythrocytes + BSA | 1.8 | [26] | |||
AdV-8 | Suspension test | Medium | 1.0-1.8 | [57] | |||
AdV-5 | Suspension test | Medium | 3.7-5.3 | [57] | |||
TuV | Suspension test | Medium | <0.5 | [30] | |||
PV1 | Suspension test | BSA/yeast extract | 0.0 | [58] | |||
AdV-25 | Suspension test | BSA/yeast extract | 0.3 | [58] | |||
Cox A11 | Suspension test | BSA/yeast extract | >5.1 | [58] | |||
FCV | Suspension test | Medium | <0.5 | [29] | |||
MNV | Suspension test | Medium | <0.5 | [29] | |||
Rhinovirus | Glass | Medium | >3.0 | >3.3 | [16] |
Efficacy of QAC against non-enveloped viruses.
See Table 1 for abbreviations used for viruses.
BSA, bovine serum albumin; medium, culture medium; QAC, quaternary ammonium compound.
Entries in purple font indicate results from original or diluted formulations with microbicidal active ingredients.
Acids and alkalines, either used alone or in combination with other active ingredients in formulated products, can be an effective means for viral inactivation. Acids may be used for disinfection, sanitization, textile or face mask pretreatment, or viral clearance during biopharmaceutical manufacturing. Alkalines may also be used for disinfection, sanitization, and viral clearance during biopharmaceutical manufacturing and can be effective against even the least susceptible of pathogens, the prions [58].
It has been widely reported that a low-pH treatment (typically at pH 4 and below) can effectively inactivate most enveloped viruses, although some enveloped viruses, such as bovine viral diarrhea virus, still exhibit a relatively low susceptibility to this treatment pH [22]. The range of susceptibilities of non-enveloped viruses to low pH seems quite scattered and often goes against the “conventional wisdom” that non-enveloped viruses are not susceptible to acidic pH (Table 6). For instance, in the family of
Virusa | Method | Soil/Matrixb | Log10 Reduction after | References | |||
---|---|---|---|---|---|---|---|
20 min | 30 min | 45 min | 1–2 hr | ||||
REO-3 | Suspension test | Medium | 1–3 | [59] | |||
PCV | Suspension test | Medium | >3 | [60] | |||
MVM | Suspension test | Medium | <1 | [61] | |||
MNV | Suspension test | Medium | <0.5 | [30] | |||
TuV | Suspension test | Medium | <0.5 | [30] | |||
PARV4 | Suspension test | Medium | 2–3 | [61] | |||
B19V | Suspension test | Medium | > 4 | [61] | |||
FCV | Suspension test | Medium | 6.3 | [30] | |||
FCV | Suspension test | Medium | >5 | [62] | |||
PV | Suspension test | Medium | <1 | [63] | |||
PV | Suspension test | Medium | <1 | [64] | |||
HAV | Suspension test | Medium | <1 | [64] | |||
MNV | Suspension test | Medium | <0.5 | [30] | |||
TuV | Suspension test | Medium | <0.5 | [30] | |||
Cox A9 | Suspension test | Medium | <1 | [65] | |||
FCV | Suspension test | Medium | ∼3 | [30] | |||
FCV | Suspension test | Medium | ∼4.7 | [62] | |||
RV | Suspension test | Medium | >3 | [65] | |||
FMDV | Suspension test | Medium | >3 | [65] | |||
MVM | Suspension test | Medium | <1 | [66] | |||
EV71 | Suspension test | Medium | <1 | [67] | |||
EV-D68 | Suspension test | Medium | ∼4–5 | <5 | [67] | ||
B19V | Suspension test | Medium | [66] |
Efficacy of low pH against non-enveloped viruses.
The
Feline calicivirus and murine norovirus in the family
Viruses, both enveloped and non-enveloped, are generally susceptible to high pH. At an environment of pH 12 or above, most if not all non-enveloped viruses would be inactivated, with extent depending both on temperature and contact time. Reovirus, simian virus 40, hepatitis A virus, canine parvovirus, poliovirus, murine norovirus, and Tulane virus seem to be less susceptible than minute virus of mice, feline calicivirus, adenovirus, rotavirus, and foot-and-mouth disease virus. It may be worth noting that the order of susceptibility to high pH seems to be in discord with the hierarchy concept by the greatest degree: in this case, an enveloped virus, bovine viral diarrhea virus, seems to be less susceptible than most, if not all, non-enveloped viruses [22]; parvoviruses are not necessarily less susceptible than many other non-enveloped viruses; and the size of the viral particle does not seem to matter much with regard to the degree of susceptibility (Table 7).
Virusa | Method | Soil/Matrixb | Log10 Reduction after | References | |||
---|---|---|---|---|---|---|---|
≤ 1 min | 10 min | 30 min | 1 hr | ||||
MNV | Suspension test | Medium | ∼2 | [30] | |||
TuV | Suspension test | Medium | ∼2.2 | [30] | |||
FCV | Suspension test | Medium | >5.5 | [30] | |||
REO-3 | Suspension test | Medium | 3 | [68] | |||
Cox B | Suspension test | Medium | 5 | [69] | |||
Echo 11 | Suspension test | Medium | 6 | [68] | |||
BVDV | Suspension test | Medium | 2.5 | [70] | |||
HAV | Suspension test | Medium | 2.7 | [59] | |||
SV40 | Suspension test | Medium | 3.9 | [70] | |||
HAV | Stainless steel | 5% serum | 3.0 | [43] | |||
HAV | Stainless steel | 90% plasma | 3.6 | [43] | |||
CPV | Stainless steel | 5% serum | 3.5 | [43] | |||
CPV | Stainless steel | 90% plasma | 5.2 | [43] | |||
MVM | Suspension test | Medium | >4.7 | [71] | |||
MVM | Suspension test | Medium | >4 | [66] | |||
CPV | Suspension test | Medium | 5.6 | [70] | |||
PV | Suspension test | Medium | 5.9 | [70] | |||
AdV-2 | Suspension test | Medium | >6.9 | [70] | |||
AdV-5 | Suspension test | Medium | >6 | [72] | |||
HAV | suspension test | Medium | 2.4 | [59] | |||
PV | suspension test | Medium | 4.1 | [63] | |||
Avian Reo | Suspension test | Medium | 4 | [73] | |||
PV | Suspension test | Medium | 5.1 | [73] | |||
Bovine Rota | Suspension test | Medium | >6 | [73] |
Efficacy of high pH against non-enveloped viruses.
Entries in purple font indicate results from undiluted or diluted formulations with microbicidal active ingredients.
Aldehydes, such as glutaraldehyde, formaldehyde, and
Virusa | Method | Soil/Matrixb | Log10 Reduction after | References | |||
---|---|---|---|---|---|---|---|
5 min | 10 min | 30 min | 60 min | ||||
HAV | Suspension test | Medium | 3.0 | [75] | |||
PPV | Stainless steel | BSA | 1.7–2.8 | [34] | |||
MVM | Stainless steel | BSA | 2.5–3.3 | [34] | |||
PV1 | Suspension test | Medium | >3 | [76] | |||
AdV-5 | Stainless steel | BSA | 4.9–6.3 | [34] | |||
PPV | Stainless steel | Erythrocytes + BSA | 3.6 | [26] | |||
MVM | Stainless steel | Erythrocytes + BSA | >4.4 | [26] | |||
AdV-5 | Suspension test | Medium | >5.0 | [77] | |||
Ortho-phthaldehyde, 0.55% | |||||||
PPV | Stainless steel | Erythrocytes + BSA | 3.6 | [26] | |||
MVM | Stainless steel | Erythrocytes + BSA | >4. | [26] |
Efficacy of aldehydes against non-enveloped viruses.
See Table 1 for abbreviations used for viruses.
BSA, bovine serum albumin; medium, culture medium; RT, room temperature.
Entries in purple font indicate results from original or diluted formulations with microbicidal active ingredients.
In the simplified hierarchy of susceptibility of pathogens to microbicides concept, small non-enveloped viruses are considered less susceptible than large non-enveloped viruses, and both groups of non-enveloped viruses are believed to be less susceptible than enveloped viruses. The hierarchy concept also assumes that the ranking applies to all types of microbicidal actives. Additionally, the hierarchy concept can generally lead to common notions that viruses that share similar virological properties (e.g., same family or genus of virus) may be expected to display similar degrees of susceptibility and that the smaller a virus is, the less susceptible it will be to microbicides in general.
These generalizations are correct, to a degree. For example, most enveloped viruses are indeed more susceptible than non-enveloped viruses to chemical inactivation. It should be noted though that exceptions to the hierarchy concept do exist, e.g., especially in the case of viral susceptibility to acids and alkalines [22], and exceptions are not uncommon for certain other chemistries. The hierarchy concept was never applied specifically to physical inactivation approaches, nor should it be. The evidence for heat inactivation, UV inactivation, and gamma irradiation indicates differing rankings of susceptibility to these modalities. Envelope status and particle size do not, in each case, relate to susceptibility for inactivation by these physical approaches [22, 78, 79, 80].
The validity of the hierarchy concept
The accuracy and usefulness of a hierarchy concept can be improved if the model is broken into separate chemistries for non-enveloped viruses, since many viruses do exhibit a reliable and consistent trend of susceptibility for a specific type of chemical. Table 9 and Figure 2 provide a summary of the relative order of susceptibility for selected non-enveloped viruses under specific types of chemistry.
Chemical | Lower susceptibility | Medium susceptibility | Higher susceptibility |
---|---|---|---|
Ethanol | Animal parvovirus | Poliovirus | Murine norovirus |
Simian virus 40 | Foot and mouth disease virus | Rhinovirus | |
Hepatitis A virus | Human norovirus | Adenovirus 5 | |
Enterovirus 71 | Feline calicivirus | Rotavirus | |
Adenovirus 2, 8 | |||
Isopropanol | Animal parvovirus | Adenovirus 5, 8 | Simian virus 40 |
Hepatitis A virus | Murine norovirus | Rotavirus | |
Enterovirus 71 | |||
Poliovirus | |||
Feline calicivirus | |||
NaOCl | Porcine parvovirus | Minute virus of mice | Feline calicivirus |
Hepatitis A virus | Hepatitis A virus | Adenovirus | |
Poliovirus | Rotavirus | ||
Enterovirus 71 | |||
Murine norovirus | |||
H2O2 | Animal parvovirus | Poliovirus | Rhinovirus |
Hepatitis A virus | Murine norovirus | Feline calicivirus | |
Adenovirus | Rotavirus | ||
PAA | Animal parvovirus | Poliovirus | Feline calicivirus |
Hepatitis A virus | Murine norovirus | ||
Adenovirus | |||
QAC | Animal parvovirus | Feline calicivirus | Rotavirus |
Poliovirus | Murine norovirus | Rhinovirus | |
Adenovirus 8, 25 | Adenovirus 5 | Coxsackievirus A11 | |
Low pH | Minute virus of mice | Human parvovirus 4 | Feline calicivirus |
Hepatitis A virus | Rhinovirus | ||
Poliovirus | Foot and mouth disease virus | ||
Enterovirus 71 | Enterovirus EV-D68 | ||
Coxsackievirus A9 | Human parvovirus B19 | ||
Murine norovirus | |||
Rotavirus | |||
Reovirus | |||
High pH | Bovine viral diarrhea virus | Reovirus | Murine minute virus |
Simian virus 40 | Feline calicivirus | ||
Hepatitis A virus | Adenovirus | ||
Canine parvovirus | Rotavirus | ||
Poliovirus | Foot and mouth disease virus | ||
Murine norovirus | |||
Tulane virus | |||
Aldehydes | Porcine parvovirus | Minute virus of mice | Poliovirus |
Hepatitis A virus | |||
Feline calicivirus | |||
Adenovirus | |||
Reovirus | |||
Rotavirus |
Relative order of susceptibility of non-enveloped viruses to chemical inactivation.
Abbreviations used: H2O2, hydrogen peroxide; NaOCl, sodium hypochlorite; PAA, peracetic acid; QAC, quaternary ammonium compound.
Relative order of susceptibility of non-enveloped viruses per microbicidal chemistry. Note: various types of adenoviruses exhibit different degrees of susceptibility to ethanol and quaternary ammonium compounds.
The Spaulding concept of the hierarchy of susceptibility of pathogens to microbicidal inactivation, along with its modifications, has been widely influential. Multiple industries as well as regulatory agencies have adopted or referenced this concept to various degrees [9, 10, 81, 82]. The concept does provide a good tool for understanding the innate differences and trending of susceptibility among various types of pathogens. For the most part, the hierarchy is insightful and valuable. It is particularly helpful when a pathogen is newly emerged, and limited or no knowledge is yet available regarding its level of susceptibility to microbicides [83, 84]. In fact, the United States Environmental Protection Agency (U.S. EPA) and Centers for Disease Control and Prevention (U.S. CDC) use the hierarchy concept as the basis of the Emerging Viral Pathogen Guidance for Antimicrobial Pesticides and public hygiene [10, 82, 85, 86] specifically to deal with just such a possibility.
It should be cautioned, however, that the hierarchy concept is largely oversimplified and by no means perfect [87]. For viruses, although enveloped viruses are usually more susceptible than non-enveloped viruses, certain enveloped viruses such as bovine viral diarrhea virus can be less susceptible than some non-enveloped viruses (e.g., feline calicivirus) under certain chemistries (e.g., low pH and high pH).
The accuracy and applicability of the hierarchy concept are more complex and limited among non-enveloped viruses. The trending is highly dependent on the type of chemistry; and the size of the virion is not always a primary determinant of viral susceptibility among non-enveloped viruses. If a clearer and more consistent trending can be identified among non-enveloped viruses, albeit only specific to a given type of chemistry, the knowledge should be useful.
To generalize an order of susceptibility, for a specific chemistry, data from side-by-side studies wherein viruses are evaluated concurrently by the same test method and under the same conditions should, ideally, be used. When results from different studies are used, caution should be taken to exclude conditional or case-specific differences that result from the test methodology and/or condition. For instance, a surface (carrier) test may give different log10 reduction results than a suspension test of the same microbicide or formulation under certain situations [88]. For example, the data of Kindermann et al. [47] and Tyler et al. [31] indicate that sodium hypochlorite causes a higher log10 reduction value (LRV) when tested in a suspension test than in a surface test. On the other hand, glutaraldehyde has been found to cause similar log reduction in either methodology, while hydrogen peroxide causes higher LRV in the surface test, which is thought to be likely related to the consumption of hydrogen peroxide by the protein in the virus-suspending solution [31].
The organic soil load in which the challenge virus is suspended prior to inoculation can also impact the viral inactivation outcome, especially for oxidizers, alcohols, and QAC. It would be inaccurate or even misleading if a result from a light organic load (e.g., 5% animal serum or phosphate-buffered saline) were to be directly compared with a test that used a heavier organic load (e.g., 90% blood or 20% fecal suspension). Tung
Other testing conditions may also affect the reduction results. For instance, a higher contact temperature may work in the favor of the virucide under investigation, which may result in a higher log reduction. Nemoto et al. [56] reported that a 0.125% glutaraldehyde solution completely inactivated rotavirus after 10 min under ambient temperature, but not when evaluated on ice. The pH and other components in the product formulation could also affect the viral reduction outcome, presumably by activating the chemical and/or by a synergistic or additive effect between the pH and the active chemical [22, 39, 89]. The efficacy of formulated versus non-formulated microbicides may differ even within the same type and concentration of active(s). For example, formulated QAC and ethanol products have been reported to exhibit strong activities against certain non-enveloped viruses albeit the efficacy may be weaker for non-formulated solutions [45, 54, 90, 91]. Therefore, the formulation of the microbicidal active must be considered. The viral stock (i.e., inoculum) preparation method and the challenge viral titer may also affect the reported viral reduction efficacy. For example, purified virus may be more susceptible than crude virus preparations [49]; viral clumps can make the virus less susceptible [92]; and a higher viral challenge titer could make the chemical harder to achieve an expected log10 reduction. Sometimes, viruses propagated in different host cell types may behave differently. It would therefore be ideal if all studies could use a standardized viral preparation and infectivity assay protocol. This is, of course, practically challenging. Last, but not least, the method for preparing the microbicide and the verification of the active concentration might also differ from lab to lab, thus potentially influencing the efficacy results obtained.
Despite these practically hard-to-avoid differences in test methodology and conditions, some generalizations on the pattern of susceptibility among non-enveloped viruses can still be made with confidence. For instance, it is quite apparent that the
The family
Different types of adenoviruses seem to exhibit varying degrees of susceptibility to ethanol and QAC. For example, adenovirus type 5 appears to be notably more susceptible to ethanol than are adenovirus types 2 and 8. In general, however, adenoviruses are more susceptible than many other non-enveloped viruses. Considering that adenovirus type 5 is listed as one of the allowable challenge viruses for a generic or “broad-spectrum” virucidal efficacy claim (i.e., a product that is effective for adenovirus type 5 may be considered effective against all viruses) [97, 98], this practice may not represent a challenge and lead to an insufficient safety margin, which is not supported by the published data.
Parvoviruses are among the smallest of non-enveloped viruses. The animal parvoviruses (e.g., minute virus of mice, porcine parvovirus, bovine parvovirus, canine parvovirus, etc.) are considered to exhibit very low susceptibility to chemical inactivation [99] and are commonly used as a worst-case model for viral inactivation studies. This literature review generally supports this notion, although it should be noted that the animal parvoviruses do not appear to represent a worst-case challenge for high-pH inactivation, and porcine parvovirus seems less susceptible than minute virus of mice at times. Additionally, human parvovirus B19 seems especially susceptible to acid treatment [100].
It has been observed that the particle size of a virus is not an exclusive or even a primary determinant of susceptibility to microbicides for non-enveloped viruses, albeit this characteristic may play a role. There are numerous reports demonstrating that larger non-enveloped viruses, such as adenoviruses and reoviruses, are less susceptible than some of the smaller non-enveloped viruses for certain chemistries. Interestingly though, rotavirus, a large non-enveloped virus, indeed seems to be the most susceptible among non-enveloped viruses, except to low pH.
The mechanisms underlying the large variation in susceptibility among non-enveloped viruses and the chemistry dependency are not always clear, but they could presumably be related to the physicochemical properties of the virus as well as the mechanisms of action of the chemical inactivants. For alcohols, for instance, it has been proposed that the hydrophobicity or hydrophilicity of the viral particles is an important determinant of susceptibility [101]. Poliovirus, which is hydrophilic, is more susceptible to ethanol than it is to isopropyl alcohol. This is attributed to the fact that ethanol is more hydrophilic than isopropanol. In comparison, the hydrophobic simian virus 40 is susceptible to isopropanol but not to ethanol [101]. Enterovirus 71 (EV71) and enterovirus EV-D68 (EV-D68) are both enteroviruses in the family
A review of the relative order of susceptibility for non-enveloped viruses under each chemistry reveals that the order for some chemicals (e.g. aldehydes) seems to fit the traditional hierarchy concept well (e.g., parvoviruses are less susceptible than larger viruses); but the order for some other chemistries (e.g., low pH) does not seem to agree with the concept as well.
The variability in viral susceptibility to physical treatments is not covered in this chapter; however, a marked degree of variation also exists for physical treatments, both within non-enveloped viruses and between enveloped and non-enveloped viruses [12, 16, 21, 49]. A comparison of the order of susceptibility of viruses to chemical versus physical treatments and an exploration of the underlying mechanisms would be interesting and revealing.
This chapter reviewed the literature on chemical inactivation of non-enveloped viruses, with an emphasis on the relative difference and trending of susceptibility among some relevant (from a public health perspective) non-enveloped viruses under each type of chemistry. The traditional concept of a hierarchy of susceptibility to microbicides provides a useful tool in understanding and predicting the susceptibility of a pathogen; however, the concept tends to be oversimplified. The order of susceptibility among non-enveloped viruses depends on the type of chemistry, and there is no universal order that holds true for all types of chemistries. Picornaviruses and caliciviruses exhibit a particularly high degree of intrafamily variation, and the order may even be reversed between viruses, depending on the chemistry. Additionally, larger non-enveloped viruses are not always more susceptible than some of the smaller non-enveloped viruses. It may be inappropriate to consider adenovirus type 5 as a worst-case non-enveloped virus; and even the animal parvoviruses, universally considered among the least susceptible to chemical inactivation, do not actually represent the least susceptible virus type for certain chemistries.
The author thanks Drs. Raymond Nims and M. Khalid Ijaz for the critical review of the manuscript and discussion.
The author declares no conflict of interest.
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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:"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:"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://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRNVJQA4/Profile_Picture_2022-03-07T13:23:04.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.",institutionString:null,institution:{name:"Kafkas University",country:{name:"Turkey"}}},{id:"178366",title:"Associate Prof.",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. He has 60 articles published in scientific journals and 20 poster presentations in scientific congresses. His research interests include physiology, endocrine system, cancer, diabetes, cardiovascular system diseases, and isolated organ bath system studies.",institutionString:"Kafkas University",institution:{name:"Kafkas University",country:{name:"Turkey"}}},{id:"418963",title:"Dr.",name:"Augustine Ododo",middleName:"Augustine",surname:"Osagie",slug:"augustine-ododo-osagie",fullName:"Augustine Ododo Osagie",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/418963/images/16900_n.jpg",biography:"Born into the family of Osagie, a prince of the Benin Kingdom. I am currently an academic in the Department of Medical Biochemistry, University of Benin. Part of the duties are to teach undergraduate students and conduct academic research.",institutionString:null,institution:{name:"University of Benin",country:{name:"Nigeria"}}},{id:"192992",title:"Prof.",name:"Shagufta",middleName:null,surname:"Perveen",slug:"shagufta-perveen",fullName:"Shagufta Perveen",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/192992/images/system/192992.png",biography:"Prof. Shagufta Perveen is a Distinguish Professor in the Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia. Dr. Perveen has acted as the principal investigator of major research projects funded by the research unit of King Saud University. She has more than ninety original research papers in peer-reviewed journals of international repute to her credit. She is a fellow member of the Royal Society of Chemistry UK and the American Chemical Society of the United States.",institutionString:"King Saud University",institution:{name:"King Saud University",country:{name:"Saudi Arabia"}}},{id:"49848",title:"Dr.",name:"Wen-Long",middleName:null,surname:"Hu",slug:"wen-long-hu",fullName:"Wen-Long Hu",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/49848/images/system/49848.jpg",biography:"Wen-Long Hu is Chief of the Division of Acupuncture, Department of Chinese Medicine at Kaohsiung Chang Gung Memorial Hospital, as well as an adjunct associate professor at Fooyin University and Kaohsiung Medical University. Wen-Long is President of Taiwan Traditional Chinese Medicine Medical Association. He has 28 years of experience in clinical practice in laser acupuncture therapy and 34 years in acupuncture. He is an invited speaker for lectures and workshops in laser acupuncture at many symposiums held by medical associations. He owns the patent for herbal preparation and producing, and for the supercritical fluid-treated needle. Dr. Hu has published three books, 12 book chapters, and more than 30 papers in reputed journals, besides serving as an editorial board member of repute.",institutionString:"Kaohsiung Chang Gung Memorial Hospital",institution:{name:"Kaohsiung Chang Gung Memorial Hospital",country:{name:"Taiwan"}}},{id:"298472",title:"Prof.",name:"Andrey V.",middleName:null,surname:"Grechko",slug:"andrey-v.-grechko",fullName:"Andrey V. Grechko",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/298472/images/system/298472.png",biography:"Andrey Vyacheslavovich Grechko, Ph.D., Professor, is a Corresponding Member of the Russian Academy of Sciences. He graduated from the Semashko Moscow Medical Institute (Semashko National Research Institute of Public Health) with a degree in Medicine (1998), the Clinical Department of Dermatovenerology (2000), and received a second higher education in Psychology (2009). Professor A.V. Grechko held the position of Сhief Physician of the Central Clinical Hospital in Moscow. He worked as a professor at the faculty and was engaged in scientific research at the Medical University. Starting in 2013, he has been the initiator of the creation of the Federal Scientific and Clinical Center for Intensive Care and Rehabilitology, Moscow, Russian Federation, where he also serves as Director since 2015. He has many years of experience in research and teaching in various fields of medicine, is an author/co-author of more than 200 scientific publications, 13 patents, 15 medical books/chapters, including Chapter in Book «Metabolomics», IntechOpen, 2020 «Metabolomic Discovery of Microbiota Dysfunction as the Cause of Pathology».",institutionString:"Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology",institution:null},{id:"199461",title:"Prof.",name:"Natalia V.",middleName:null,surname:"Beloborodova",slug:"natalia-v.-beloborodova",fullName:"Natalia V. Beloborodova",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/199461/images/system/199461.jpg",biography:'Natalia Vladimirovna Beloborodova was educated at the Pirogov Russian National Research Medical University, with a degree in pediatrics in 1980, a Ph.D. in 1987, and a specialization in Clinical Microbiology from First Moscow State Medical University in 2004. She has been a Professor since 1996. Currently, she is the Head of the Laboratory of Metabolism, a division of the Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology, Moscow, Russian Federation. N.V. Beloborodova has many years of clinical experience in the field of intensive care and surgery. She studies infectious complications and sepsis. She initiated a series of interdisciplinary clinical and experimental studies based on the concept of integrating human metabolism and its microbiota. Her scientific achievements are widely known: she is the recipient of the Marie E. Coates Award \\"Best lecturer-scientist\\" Gustafsson Fund, Karolinska Institutes, Stockholm, Sweden, and the International Sepsis Forum Award, Pasteur Institute, Paris, France (2014), etc. Professor N.V. Beloborodova wrote 210 papers, five books, 10 chapters and has edited four books.',institutionString:"Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology",institution:null},{id:"354260",title:"Ph.D.",name:"Tércio Elyan",middleName:"Azevedo",surname:"Azevedo Martins",slug:"tercio-elyan-azevedo-martins",fullName:"Tércio Elyan Azevedo Martins",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/354260/images/16241_n.jpg",biography:"Graduated in Pharmacy from the Federal University of Ceará with the modality in Industrial Pharmacy, Specialist in Production and Control of Medicines from the University of São Paulo (USP), Master in Pharmaceuticals and Medicines from the University of São Paulo (USP) and Doctor of Science in the program of Pharmaceuticals and Medicines by the University of São Paulo. Professor at Universidade Paulista (UNIP) in the areas of chemistry, cosmetology and trichology. Assistant Coordinator of the Higher Course in Aesthetic and Cosmetic Technology at Universidade Paulista Campus Chácara Santo Antônio. Experience in the Pharmacy area, with emphasis on Pharmacotechnics, Pharmaceutical Technology, Research and Development of Cosmetics, acting mainly on topics such as cosmetology, antioxidant activity, aesthetics, photoprotection, cyclodextrin and thermal analysis.",institutionString:null,institution:{name:"University of Sao Paulo",country:{name:"Brazil"}}},{id:"334285",title:"Ph.D. Student",name:"Sameer",middleName:"Kumar",surname:"Jagirdar",slug:"sameer-jagirdar",fullName:"Sameer Jagirdar",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/334285/images/14691_n.jpg",biography:"I\\'m a graduate student at the center for biosystems science and engineering at the Indian Institute of Science, Bangalore, India. I am interested in studying host-pathogen interactions at the biomaterial interface.",institutionString:null,institution:{name:"Indian Institute of Science Bangalore",country:{name:"India"}}},{id:"329795",title:"Dr.",name:"Mohd Aftab",middleName:"Aftab",surname:"Siddiqui",slug:"mohd-aftab-siddiqui",fullName:"Mohd Aftab Siddiqui",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/329795/images/15648_n.jpg",biography:"Dr. Mohd Aftab Siddiqui is currently working as Assistant Professor in the Faculty of Pharmacy, Integral University, Lucknow for the last 6 years. He has completed his Doctor in Philosophy (Pharmacology) in 2020 from Integral University, Lucknow. He completed his Bachelor in Pharmacy in 2013 and Master in Pharmacy (Pharmacology) in 2015 from Integral University, Lucknow. He is the gold medalist in Bachelor and Master degree. He qualified GPAT -2013, GPAT -2014, and GPAT 2015. His area of research is Pharmacological screening of herbal drugs/ natural products in liver and cardiac diseases. He has guided many M. Pharm. research projects. He has many national and international publications.",institutionString:"Integral University",institution:null},{id:"255360",title:"Dr.",name:"Usama",middleName:null,surname:"Ahmad",slug:"usama-ahmad",fullName:"Usama Ahmad",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/255360/images/system/255360.png",biography:"Dr. Usama Ahmad holds a specialization in Pharmaceutics from Amity University, Lucknow, India. He received his Ph.D. degree from Integral University. Currently, he’s working as an Assistant Professor of Pharmaceutics in the Faculty of Pharmacy, Integral University. From 2013 to 2014 he worked on a research project funded by SERB-DST, Government of India. He has a rich publication record with more than 32 original articles published in reputed journals, 3 edited books, 5 book chapters, and a number of scientific articles published in ‘Ingredients South Asia Magazine’ and ‘QualPharma Magazine’. He is a member of the American Association for Cancer Research, International Association for the Study of Lung Cancer, and the British Society for Nanomedicine. Dr. Ahmad’s research focus is on the development of nanoformulations to facilitate the delivery of drugs that aim to provide practical solutions to current healthcare problems.",institutionString:"Integral University",institution:{name:"Integral University",country:{name:"India"}}},{id:"30568",title:"Prof.",name:"Madhu",middleName:null,surname:"Khullar",slug:"madhu-khullar",fullName:"Madhu Khullar",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/30568/images/system/30568.jpg",biography:"Dr. Madhu Khullar is a Professor of Experimental Medicine and Biotechnology at the Post Graduate Institute of Medical Education and Research, Chandigarh, India. She completed her Post Doctorate in hypertension research at the Henry Ford Hospital, Detroit, USA in 1985. She is an editor and reviewer of several international journals, and a fellow and member of several cardiovascular research societies. Dr. Khullar has a keen research interest in genetics of hypertension, and is currently studying pharmacogenetics of hypertension.",institutionString:"Post Graduate Institute of Medical Education and Research",institution:{name:"Post Graduate Institute of Medical Education and Research",country:{name:"India"}}},{id:"223233",title:"Prof.",name:"Xianquan",middleName:null,surname:"Zhan",slug:"xianquan-zhan",fullName:"Xianquan Zhan",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/223233/images/system/223233.png",biography:"Xianquan Zhan received his MD and Ph.D. in Preventive Medicine at West China University of Medical Sciences. He received his post-doctoral training in oncology and cancer proteomics at the Central South University, China, and the University of Tennessee Health Science Center (UTHSC), USA. He worked at UTHSC and the Cleveland Clinic in 2001–2012 and achieved the rank of associate professor at UTHSC. Currently, he is a full professor at Central South University and Shandong First Medical University, and an advisor to MS/PhD students and postdoctoral fellows. He is also a fellow of the Royal Society of Medicine and European Association for Predictive Preventive Personalized Medicine (EPMA), a national representative of EPMA, and a member of the American Society of Clinical Oncology (ASCO) and the American Association for the Advancement of Sciences (AAAS). He is also the editor in chief of International Journal of Chronic Diseases & Therapy, an associate editor of EPMA Journal, Frontiers in Endocrinology, and BMC Medical Genomics, and a guest editor of Mass Spectrometry Reviews, Frontiers in Endocrinology, EPMA Journal, and Oxidative Medicine and Cellular Longevity. He has published more than 148 articles, 28 book chapters, 6 books, and 2 US patents in the field of clinical proteomics and biomarkers.",institutionString:"Shandong First Medical University",institution:{name:"Affiliated Hospital of Shandong Academy of Medical Sciences",country:{name:"China"}}},{id:"297507",title:"Dr.",name:"Charles",middleName:"Elias",surname:"Assmann",slug:"charles-assmann",fullName:"Charles Assmann",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/297507/images/system/297507.jpg",biography:"Charles Elias Assmann is a biologist from Federal University of Santa Maria (UFSM, Brazil), who spent some time abroad at the Ludwig-Maximilians-Universität München (LMU, Germany). He has Masters Degree in Biochemistry (UFSM), and is currently a PhD student at Biochemistry at the Department of Biochemistry and Molecular Biology of the UFSM. His areas of expertise include: Biochemistry, Molecular Biology, Enzymology, Genetics and Toxicology. He is currently working on the following subjects: Aluminium toxicity, Neuroinflammation, Oxidative stress and Purinergic system. Since 2011 he has presented more than 80 abstracts in scientific proceedings of national and international meetings. Since 2014, he has published more than 20 peer reviewed papers (including 4 reviews, 3 in Portuguese) and 2 book chapters. He has also been a reviewer of international journals and ad hoc reviewer of scientific committees from Brazilian Universities.",institutionString:"Universidade Federal de Santa Maria",institution:{name:"Universidade Federal de Santa Maria",country:{name:"Brazil"}}},{id:"217850",title:"Dr.",name:"Margarete Dulce",middleName:null,surname:"Bagatini",slug:"margarete-dulce-bagatini",fullName:"Margarete Dulce Bagatini",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/217850/images/system/217850.jpeg",biography:"Dr. Margarete Dulce Bagatini is an associate professor at the Federal University of Fronteira Sul/Brazil. She has a degree in Pharmacy and a PhD in Biological Sciences: Toxicological Biochemistry. She is a member of the UFFS Research Advisory Committee\nand a member of the Biovitta Research Institute. She is currently:\nthe leader of the research group: Biological and Clinical Studies\nin Human Pathologies, professor of postgraduate program in\nBiochemistry at UFSC and postgraduate program in Science and Food Technology at\nUFFS. She has experience in the area of pharmacy and clinical analysis, acting mainly\non the following topics: oxidative stress, the purinergic system and human pathologies, being a reviewer of several international journals and books.",institutionString:"Universidade Federal da Fronteira Sul",institution:{name:"Universidade Federal da Fronteira Sul",country:{name:"Brazil"}}},{id:"226275",title:"Ph.D.",name:"Metin",middleName:null,surname:"Budak",slug:"metin-budak",fullName:"Metin Budak",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/226275/images/system/226275.jfif",biography:"Metin Budak, MSc, PhD is an Assistant Professor at Trakya University, Faculty of Medicine. He has been Head of the Molecular Research Lab at Prof. Mirko Tos Ear and Hearing Research Center since 2018. His specializations are biophysics, epigenetics, genetics, and methylation mechanisms. He has published around 25 peer-reviewed papers, 2 book chapters, and 28 abstracts. He is a member of the Clinical Research Ethics Committee and Quantification and Consideration Committee of Medicine Faculty. His research area is the role of methylation during gene transcription, chromatin packages DNA within the cell and DNA repair, replication, recombination, and gene transcription. His research focuses on how the cell overcomes chromatin structure and methylation to allow access to the underlying DNA and enable normal cellular function.",institutionString:"Trakya University",institution:{name:"Trakya University",country:{name:"Turkey"}}},{id:"243049",title:"Dr.",name:"Anca",middleName:null,surname:"Pantea Stoian",slug:"anca-pantea-stoian",fullName:"Anca Pantea Stoian",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/243049/images/system/243049.jpg",biography:"Anca Pantea Stoian is a specialist in diabetes, nutrition, and metabolic diseases as well as health food hygiene. She also has competency in general ultrasonography.\n\nShe is an associate professor in the Diabetes, Nutrition and Metabolic Diseases Department, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania. She has been chief of the Hygiene Department, Faculty of Dentistry, at the same university since 2019. Her interests include micro and macrovascular complications in diabetes and new therapies. Her research activities focus on nutritional intervention in chronic pathology, as well as cardio-renal-metabolic risk assessment, and diabetes in cancer. She is currently engaged in developing new therapies and technological tools for screening, prevention, and patient education in diabetes. \n\nShe is a member of the European Association for the Study of Diabetes, Cardiometabolic Academy, CEDA, Romanian Society of Diabetes, Nutrition and Metabolic Diseases, Romanian Diabetes Federation, and Association for Renal Metabolic and Nutrition studies. She has authored or co-authored 160 papers in national and international peer-reviewed journals.",institutionString:null,institution:{name:"Carol Davila University of Medicine and Pharmacy",country:{name:"Romania"}}},{id:"279792",title:"Dr.",name:"João",middleName:null,surname:"Cotas",slug:"joao-cotas",fullName:"João Cotas",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/279792/images/system/279792.jpg",biography:"Graduate and master in Biology from the University of Coimbra.\n\nI am a research fellow at the Macroalgae Laboratory Unit, in the MARE-UC – Marine and Environmental Sciences Centre of the University of Coimbra. My principal function is the collection, extraction and purification of macroalgae compounds, chemical and bioactive characterization of the compounds and algae extracts and development of new methodologies in marine biotechnology area. \nI am associated in two projects: one consists on discovery of natural compounds for oncobiology. The other project is the about the natural compounds/products for agricultural area.\n\nPublications:\nCotas, J.; Figueirinha, A.; Pereira, L.; Batista, T. 2018. An analysis of the effects of salinity on Fucus ceranoides (Ochrophyta, Phaeophyceae), in the Mondego River (Portugal). Journal of Oceanology and Limnology. in press. DOI: 10.1007/s00343-019-8111-3",institutionString:"Faculty of Sciences and Technology of University of Coimbra",institution:null},{id:"279788",title:"Dr.",name:"Leonel",middleName:null,surname:"Pereira",slug:"leonel-pereira",fullName:"Leonel Pereira",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/279788/images/system/279788.jpg",biography:"Leonel Pereira has an undergraduate degree in Biology, a Ph.D. in Biology (specialty in Cell Biology), and a Habilitation degree in Biosciences (specialization in Biotechnology) from the Faculty of Science and Technology, University of Coimbra, Portugal, where he is currently a professor. In addition to teaching at this university, he is an integrated researcher at the Marine and Environmental Sciences Center (MARE), Portugal. His interests include marine biodiversity (algae), marine biotechnology (algae bioactive compounds), and marine ecology (environmental assessment). Since 2008, he has been the author and editor of the electronic publication MACOI – Portuguese Seaweeds Website (www.seaweeds.uc.pt). He is also a member of the editorial boards of several scientific journals. Dr. Pereira has edited or authored more than 20 books, 100 journal articles, and 45 book chapters. He has given more than 100 lectures and oral communications at various national and international scientific events. He is the coordinator of several national and international research projects. In 1998, he received the Francisco de Holanda Award (Honorable Mention) and, more recently, the Mar Rei D. Carlos award (18th edition). He is also a winner of the 2016 CHOICE Award for an outstanding academic title for his book Edible Seaweeds of the World. In 2020, Dr. Pereira received an Honorable Mention for the Impact of International Publications from the Web of Science",institutionString:"University of Coimbra",institution:{name:"University of Coimbra",country:{name:"Portugal"}}},{id:"61946",title:"Dr.",name:"Carol",middleName:null,surname:"Bernstein",slug:"carol-bernstein",fullName:"Carol Bernstein",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/61946/images/system/61946.jpg",biography:"Carol Bernstein received her PhD in Genetics from the University of California (Davis). She was a faculty member at the University of Arizona College of Medicine for 43 years, retiring in 2011. Her research interests focus on DNA damage and its underlying role in sex, aging and in the early steps of initiation and progression to cancer. In her research, she had used organisms including bacteriophage T4, Neurospora crassa, Schizosaccharomyces pombe and mice, as well as human cells and tissues. She authored or co-authored more than 140 scientific publications, including articles in major peer reviewed journals, book chapters, invited reviews and one book.",institutionString:"University of Arizona",institution:{name:"University of Arizona",country:{name:"United States of America"}}},{id:"182258",title:"Dr.",name:"Ademar",middleName:"Pereira",surname:"Serra",slug:"ademar-serra",fullName:"Ademar Serra",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/182258/images/system/182258.jpeg",biography:"Dr. Serra studied Agronomy on Universidade Federal de Mato Grosso do Sul (UFMS) (2005). He received master degree in Agronomy, Crop Science (Soil fertility and plant nutrition) (2007) by Universidade Federal da Grande Dourados (UFGD), and PhD in agronomy (Soil fertility and plant nutrition) (2011) from Universidade Federal da Grande Dourados / Escola Superior de Agricultura Luiz de Queiroz (UFGD/ESALQ-USP). Dr. Serra is currently working at Brazilian Agricultural Research Corporation (EMBRAPA). His research focus is on mineral nutrition of plants, crop science and soil science. Dr. Serra\\'s current projects are soil organic matter, soil phosphorus fractions, compositional nutrient diagnosis (CND) and isometric log ratio (ilr) transformation in compositional data analysis.",institutionString:"Brazilian Agricultural Research Corporation",institution:{name:"Brazilian Agricultural Research Corporation",country:{name:"Brazil"}}}]}},subseries:{item:{id:"26",type:"subseries",title:"Machine Learning and Data Mining",keywords:"Intelligent Systems, Machine Learning, Data Science, Data Mining, Artificial Intelligence",scope:"The scope of machine learning and data mining is immense and is growing every day. It has become a massive part of our daily lives, making predictions based on experience, making this a fascinating area that solves problems that otherwise would not be possible or easy to solve. 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He is a full professor at the Universidad Autonoma de Queretaro, Mexico, and a member of the National System of Researchers (SNI) since 2009. Dr. Aceves Fernandez has published more than 80 research papers as well as a number of book chapters and congress papers. He has contributed in more than 20 funded research projects, both academic and industrial, in the area of artificial intelligence, ranging from environmental, biomedical, automotive, aviation, consumer, and robotics to other applications. He is also a honorary president at the National Association of Embedded Systems (AMESE), a senior member of the IEEE, and a board member of many institutions. 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