![]() Because of above reasons, variety of methods had been developed for quantitative enumeration of microorganisms such as direct microscopic counts, electronic cell counters, chemical methods, spectrophotometric analysis and serial-dilution agar plate analysis. In addition, worldwide the numbers of microorganisms in a given sample are required to know in certain aspects such as dairy industries, water treatment, food manufactures, and importantly in investigation and study of diseases. Moreover, it is often important to know not only what kinds of microorganism are present in a given or obtained sample but also to know the number of microorganism in sample which is difficult to count under the naked eyes because of their small size. ![]() ![]() The size of microorganisms is about 1/10th the size of a typical human cell, and measured in the scale of one millionth of a meter known as micrometer. Introduction It is difficult to know and imagine the size of microorganisms, since they are too small to be seen under the naked eyes.
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