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Biological Oxygen Demand (BOD)

It is also known as Biochemical Oxygen Demand (BOD). It is defined as

There are certain bacteria which cannot be stained by

In 1883 (originally published in 1884), Dr. Hans Christian Gram (1853-1938) developed a technique for the classification of bacteria into two broad groups, Gram-positive and Gram-negative.

Waste products discharged from the digestive tract are composed of up to 75% water, food which is digested but not absorbed, indigestible residue, undigested food,

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