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IN
CHAPTER – 10 : MICROBES IN HUMAN WELFARE
Microbes in Household products:
A common example is the production of curd from milk
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During growth, the LAB produces acids that coagulate and partially
digest the milk proteins
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In our stomach too, the LAB play very beneficial role in checking disease causing
microbes
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“Toddy”, a traditional drink of some parts of southern India is made by fermenting sap
from palms
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Cheese, is one of the oldest food items in which microbes were used
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The ‘Roquefort cheese’ is ripened by growing a
specific fungus on them for a particular flavour
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a) Fermented Beverages:
The yeast Saccharomyces cerevisiae used for bread making and commonly called
brewer’s yeast, is used for fermenting malted cereals and fruit juices to produce ethanol
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b) Antibiotics:
Antibiotics are chemical substances, which are produced by some microbes and can kill
or retard the growth of other disease causing microbes
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Alexander Fleming while working on Staphylococci bacteria, once observed a mould
growing in one of his unwashed culture plates around which Staphylococci could not grow
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Later, Ernest Chain and Howard Florey made its full potential
effective antibiotic
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NCRTSOLUTIONS
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Statins (Monascus purpureus yeast) – used as blood cholesterol lowering agents
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This treatment is carried out in two stages;
Primary treatment / Physical treatment:
It involves physical removal of particles from
the sewage through filtration and sedimentation
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The effluent from the primary settling tank is taken for secondary treatment
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While growing, these microbes consume the major part of
the organic matter in the effluent
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BOD is a measure of the organic matter present in the
water
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Once the BOD of sewage water is reduced significantly, t