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Cragie tube


The Cragie tube or Craigie tube is a method used in microbiology for determining bacterial motility.

A hollow tube with some culture medium is placed in semi-solid agar inside a bottle. Now a sample of the bacterium to be tested is inoculated into the medium in the hollow tube and the setup is incubated at 37°C overnight.

On examining the areas where bacterial growth has occurred we find that:-

Confirmation may be obtained by subculture and retesting.


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Wikipedia

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