Hey everybody! I'm an undergrad who handles the microbiology testing in an o-chem lab, so I don't really have anyone to ask this question.
Anyway, I keep the microbes I use (S. aureus, E. coli, and P. aeruginosa) in TSB in a refrigerator, and I get new TSB stock and new bacteria from the freezer every 8 weeks. New P. aeruginosa forms nice clear/white colonies on TSA, but twice now towards the end of the 8 weeks, they form green colonies.
Does anyone else happen to know what's causing this?
Submitted December 02, 2014 at 08:58PM by question_assumptions http://ift.tt/1pNt25X microbiology
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