Craigie tube

Craigie tube
a tube apparatus used for separating motile from nonmotile bacteria; it consists of a length of glass tubing with slanted bottom inserted into a larger tube of semisolid culture medium with the top of the smaller tube protruding above the medium. The medium is inoculated by stab inside the smaller tube. Organisms isolated from the medium outside the tubing are motile; nonmotile types remain inside.

Medical dictionary. 2011.

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