Strange Combination of Questions
yersinia at GATE.CYBERNEX.NET
Wed Nov 20 17:19:29 EST 1996
Hello good people,
I'm back once again to plague you with questions....
1. Why are penicillins G, N, S, O and V given those letters to
distinguish them? I looked in the Merck Index and this does describe
differences in chemical structures, but it (nor a bunch of web sites that
mention penicillin) state why those letters and (if applicable) what they
2. This one is about D-values and spore strips. If you have, a spore
strip with, as an example, a D-value of one minute and 10^4 (100,000)
bugs, therefore killing 90,000 bugs in that one minute, the next minute
will only kill 90% of the remaining 90,000 - since 90% of 90,000 is less
than 90,000, why don't *all* the bugs die in the next minute, while one
minute was sufficient to kill the first 90,000?
3. I hope I'm making an ass of myself with this one and someone can tell
me where in Bergey's it is... the genus Leclercia (particularly with
regard to L. adecarboxylata, which turned up in a sample at work). I did
see it briefly mentioned with Escherichia, but what is(are) the
difference(s) between Leclercia and Escherichia? I know Leclercia is a
coliform because of its reactions on EMB and MacConkey, but that's all I
know about it.
Thank you in advance for your help. :-D
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