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Microbiology reagents in the form of liquids, solids, or semisolids used as a selective medium capable of supporting the growth of certain types of bacteria, while inhibiting the growth of other microorganisms. These selective culture media consist of particular substances including dyes (e.g., methylene blue, crystal violet) or high (e.g., 7%) salt concentration products that inhibit the growth of unwanted microorganisms, and allow the specified bacteria to be isolated from a mixed culture. Bacteria selective culture media are typically used in laboratories to ensure the survival or proliferation of bacteria with certain properties (e.g., antibiotic resistance, the ability to synthesize a certain metabolite).
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