1. Technique

2. Observation

3. References

4. See also

The Cragie tube or Craigie tube is a method used in microbiology^[1][2] for determining bacterial motility.

Technique

A hollow tube with some culture medium is placed in semi-solid agar inside a bottle. 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.

Observation

On examining the areas where bacterial growth has occurred there are several observations to be made:

• 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.

References

See also

• Kauffman-White classification

• Little Eau Claire, Wisconsin
• Little ebony spleenwort
• Little Econ River
• Little Egg Harbor Bay
• Little Egg Harbor massacre
• Little Egg Inlet
• Little Egret
• Little Egypt (archaeological site)
• Little Egypt, Astoria
• Little Egypt (film)
• Little Egypt (song)
• Little Egypt (Ying-Yang)
• Little Elbow Lake
• Little Elephant Sessions
• Little elephant's head
• Little Elm High School
• Little Elobey
• Little Eltham Common
• Little Emperors
• Little endianness
• Little Engine that Could
• Little England (film)
• Little England (Gloucester, Virginia)
• Little England (TV series)
• Little Enz