E. coli sheen on EMB agar

stuhansenmic at PICARD.COLSF.EDU stuhansenmic at PICARD.COLSF.EDU
Tue Feb 7 17:45:11 EST 1995

I am an undergraduate biology major that recently finished an intro to 
microbiology class.  An organism isolated appears to be E. coli, according to
IMViC results, several sugar fermentation tests, and a Biolog microtiter
plate, but it won't produce the characteristic green metallic sheen on EMB.
Can anyone tell me if this is common? I have found no real answers in any
books, including Bergey's and The Prokaryotes.  Also, what causes the sheen
to form in the colonies?

Thanks in advance for any help.

Mike Hansen

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