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Environmental Biodegradation Research Focus (Hardcover, Illustrated Ed)
Loot Price: R3,772
Discovery Miles 37 720
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Environmental Biodegradation Research Focus (Hardcover, Illustrated Ed)
Expected to ship within 10 - 15 working days
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This new book is devoted to leading-edge research on environmental
biodegradation which is the destruction of organic compounds by
microorganisms. Microorganisms, particularly bacteria, are
responsible for the decomposition of both natural and synthetic
organic compounds in nature. Mineralisation results in complete
conversion of a compound to its inorganic mineral constituents (for
example, carbon dioxide from carbon, sulphate or sulphide from
organic sulphur, nitrate or ammonium from organic nitrogen,
phosphate from organophosphates, or chloride from organochlorine).
Since carbon comprises the greatest mass of organic compounds,
mineralisation can be considered in terms of CO2 evolution.
Radioactive carbon-14 (14C) isotopes enable scientists to
distinguish between mineralisation arising from contaminants and
soil organic matter. However, mineralisation of any compound is
never 100% because some of it (10-40% of the total amount degraded)
is incorporated into the cell mass or products that become part of
the amorphous soil organic matter, commonly referred to as humus.
Thus, biodegradation comprises mineralisation and conversion to
innocuous products, namely biomass and humus. Primary
biodegradation is more limited in scope and refers to the
disappearance of the compound as a result of its biotransformation
to another product. Compounds that are readily biodegradable are
generally utilised as growth substrates by single microorganisms.
Many of the components of petroleum products (and frequent
ground-water contaminants), such as benzene, toluene, ethylbenzene,
and xylene, are utilised by many genera of bacteria as sole carbon
sources for growth and energy.
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