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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.
Slanetz and Bartley agar (SlaBa agar) is a selective medium, which is used for surface streaking and enumeration of Enterococcus spp. in drinking water, beverages and other biological products of animal origin.he other half (B) is covered with E. coli-agar. Most pathogens of the urinary tract grow on CLED agar and if they are lactose fermenting, the colour of CLED agar changes from green to yellow. The MacConkey agar is used to grow mainly gram negative bacteria.