The Cragie tube or Craigie tube is a method used in microbiology for determining bacterial motility.
Contents
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.
Observation
On examining the areas where bacterial growth has occurred we find that:-
Confirmation may be obtained by subculture and retesting.
References
Cragie tube Wikipedia(Text) CC BY-SA