Cragie tube
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It is a method of determining bacterial motility.Instruments used specially in Microbiology are as follows: [1][2]
Contents |
[edit] Technique
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.
[edit] Observation
On examining the areas where bacterial growth has occurred we find that:-
- the colonies of the non-motile bacteria remain confined within the tube at the site of inoculation
- the motile bacteria swim out from the bottom of the tube and colonize the surrounding medium as well
Confirmation may be obtained by subculture and retesting.
[edit] References
- ^ Textbook of Microbiology by Prof. C P Baveja, ISBN 81-7855-266-3
- ^ extbook of Microbiology by Ananthanarayan and Panikar, ISBN 81-250-2808-0
[edit] See also
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