Gram Stain and Purity
Country: United States
Date: January 2007
How might the Gram stain technique be of value in
establishing the purity of a culture of bacteria?
If all of the cells in a culture are Gram positive, this would tell you
that there are no Gram negative cells in the culture. But you must do many
additional test like cell morphology, colony morphology, sugar fermentation
tests plus other tests in order to conclude that it is a pure culture.
Ron Baker, Ph.D.
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Update: June 2012