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Nutrient Agar: composition, preparation and uses 4.58/5 (19) Nutrient agar is used as a general purpose medium for the growth of a wide variety of non-fastidious microorganisms. It consists of peptone, beef extract and agar. This relatively simple formulation provides the nutrients necessary for the replication of a large number of non-fastidious microorganisms.
For preparing agar containing media in test-tubes, the culture medium is mixed with 3% agar and heated with stirring to melt. This ensures that all the tubes get equal amounts of agar. These tubes can then be sterilized by autoclaving. Reducing the amount of agar to 0.2-0.5% renders a medium semi-solid.or preparing agar containing media in test-tubes, the culture medium is mixed with 3% agar and heated with stirring to melt. This ensures that all the tubes get equal amounts of agar. These tubes can then be sterilized by autoclaving. Reducing the amount of agar to 0.2-0.5% renders a medium semi-solid.