why macconkey of is called as Selective as well as differential media
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Answer:
MacConkey agar is a selective and differential culture medium for bacteria. ... The media inhibits growth of Gram-positive organisms with crystal violet and bile salts, allowing for the selection and isolation of gram-negative bacteria.
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Answer:
MacConkey agar is a selective and differential culture medium for bacteria. It is designed to selectively isolate Gram-negative and enteric (normally found in the intestinal tract) bacteria and differentiate them based on lactose fermentation.[1] Lactose fermenters turn red or pink on McConkey agar, and nonfermenters do not change color. The media inhibits growth of Gram-positive organisms with crystal violet and bile salts, allowing for the selection and isolation of gram-negative bacteria. The media detects lactose fermentation by enteric bacteria with the pH indicator neutral red.[2]
A MacConkey agar plate with an active bacterial culture.
Lactose
MacConkey agar with LF and non-LF colonies. The organism on the left is a lactose fermenter, as evidenced by the pink color. The organism on the right produced no color, so it does not appear to be a lactose fermenter.
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