Bacteria, mold, yeast and bacteria each species. Different nutrients out. It is a mixture of different types to suit the growth of microorganisms. However, the most important properties of the medium of all kinds should have the following properties : 1. Nutrient suitable for microbial growth and a concentration suitable second. Acidity, alkalinity (pH) suitable for each kind of microorganism three. No toxic fourth. Nothing has any life. Contaminants in food.
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