Summary
All microbes are not pathogenic, many of them
are beneficial to human beings. We use microbes and their derived products
almost every day. Lactic acid bacteria convert milk into curd. Saccharomyces
cerevisiae (yeast) is used in bread making. Idly and dosa are
made from dough fermented by microbes. Bacteria and fungi are used in cheese
making. Industrial products like lactic acid, acetic acid and alcohol are
produced by microbes. Antibiotics are produced from useful microbes to kill the
disease causing harmful microbes. For more than a hundred years, microbes are
being used to treat sewage by the process of activated sludge formation.
Bio-gas produced by microbes is used as a source of energy in rural areas.
Microbes are also used as bio-control agents to avoid the use of toxic pesticides.
Now a days chemical fertilisers are gradually replaced by bio-fertilisers. In
bio-remediation naturally occurring or genetically engineered microorganisms
are used to reduce or degrade pollutants.
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