Enrichment medium is used to increase the relative concentration of certain microorganisms in the culture prior to plating on solid selective medium. Glutamine is an unstable essential amino acid required in cell culture media formulations. A bioprocess is a specific process that uses complete living cells or their components (e.g., bacteria, enzymes, chloroplasts) to obtain desired products. Peptone is used in culture media to mainly supply nitrogen. CULTURE MEDIA BASIC INGREDIENTS