麦康凯琼脂平板
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下一篇 2013-01-29 20:51:34
This image illustrates growth of a nonlactose fermenter on MacConkey agar.
MacConkey agar contains bile salts and crystal violet which inhibit the growth
of gram-positive bacteria. The agar also contains lactose and a red dye that
differentiates the lactose fermenters from the nonfermenters. Colonies of
lactose fermenting bacteria will be pink to red while the nonfermenters will
appear colorless or transparent. However, this agar does not distinguish between
the nonlactose fermenters; this growth could indicate several organisms -
Proteus, Salmonella or Shigella, for example. In a stool specimen, it would be
enough evidence to continue with further identification. This image is useful
when discussing metabolism and the concept of differentiating bacteria from one
another by the presence of enzymes.
Age of culture is 24 h.
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