<P> Nutrient agar is a general purpose medium supporting growth of a wide range of non-fastidious organisms . It typically contains (mass / volume): </P> <Ul> <Li> 0.5% Peptone - this provides organic nitrogen </Li> <Li> 0.3% beef extract / yeast extract - the water - soluble content of these contribute vitamins, carbohydrates, nitrogen, and salts </Li> <Li> 1.5% agar - this gives the mixture solidity </Li> <Li> 0.5% Sodium Chloride - this gives the mixture proportions similar to those found in the cytoplasm of most organisms </Li> <Li> distilled water - water serves as a transport medium for the agar's various substances </Li> <Li> pH adjusted to neutral (6.8) at 25 ° C . </Li> </Ul>

Nutrient agar is an example of what medium