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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.
Blood Agar Is Not a Selective Medium. If a bacterial growth medium is selective, that means that it grows only certain types of microbes while inhibiting the growth of other types of microbes. Blood agar is an enriched medium that provides an extra rich nutrient environment for microbes.