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Microbiology 141 (1995), 1081-1083
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microbiology, Vol 141, 1081-1083, Copyright © 1995 by Society for General Microbiology

ARTICLES

Division-inhibition capacity of penicillin in Escherichia coli is growth-rate dependent

H Hadas, M Einav, I Fishov and A Zaritsky
Department of Life Sciences, Ben-Gurion University of the Negev, Be'er- Sheva, Israel.

Growing bacteria are sensitive to various beta-lactam derivatives due to their interference with peptidoglycan biosynthesis. At low concentrations, penicillin G (benzylpenicillin) blocks cell division without affecting mass growth rate. The MIC for division of Escherichia coli B/r (H266) was found to depend on the growth rate, which was modified by the nutritional conditions. Our hypothesis, that division sensitivity is proportional to the rate of peptidoglycan synthesis for septum formation, as well as to cell circumference, was thus confirmed.


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