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Nutrient agar is a general-purpose, nutrient medium used for the cultivation of microbes. It is frequently used for isolation and purification of cultures. As we are using it here, it can also be used as a means for producing the bacterial lawns needed for antibiotic sensitivity tests.utrient agar consists of heat-stable digestive products of proteins (called peptones) and beef extract. Both of these provide amino acids, minerals, and other nutrients used by a wide variety of bacteria for growth.
Starch Agar and the Amylase Test. Starch Agar is basically an all-purpose medium (e.g., Nutrient Agar, Heart Infusion Agar) to which 0.4% soluble starch is added.A plate of this medium is single streaked or spot inoculated with the organism to be tested. After incubation (preferably for several days) the medium is flooded with Gram's iodine.tarch Agar and the Amylase Test. Starch Agar is basically an all-purpose medium (e.g., Nutrient Agar, Heart Infusion Agar) to which 0.4% soluble starch is added.