gram+ and gram-

Paul Cotton paul at
Wed Sep 24 15:18:49 EST 1997

I have a sixth form student investigating the antiseptic/antibiotic
properties of garlic extracts. There is evidence to suggest that the
effect is different on gram + and gram- bacteria. Can someone tell me if
there is a simple way to stain a mixed plate of bacteria differentially
to show up one of the types. I know that we can utilise gram staining on
smears but this is inappropriate for colonies on an agar plate.

Thanks in anticipation
Paul Cotton

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