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大肠杆菌对头孢菌素3'-喹诺酮酯Ro 23-9424的低水平耐药性。

Low-level resistance to the cephalosporin 3'-quinolone ester Ro 23-9424 in Escherichia coli.

作者信息

Chapman J S, Bertasso A, Cummings L M, Georgopapadakou N H

机构信息

Roche Research Center, Nutley, New Jersey 07110, USA.

出版信息

Antimicrob Agents Chemother. 1995 Feb;39(2):564-6. doi: 10.1128/AAC.39.2.564.

Abstract

Four spontaneous, single-step mutants of Escherichia coli K-12 resistant to low levels of the cephalosporin 3'-quinolone ester Ro 23-9424 were isolated at a frequency of 10(-10) to 10(-11) mutants per CFU plated. The mutants were cross-resistant to both cephalosporin (cefotaxime) and quinolone (fleroxacin) components. Accordingly, they had altered porins and replicative DNA biosynthesis resistant to fleroxacin. There was no increase in beta-lactamase activity when tested with nitrocephin, and the penicillin-binding protein profiles were normal.

摘要

以每平板接种的CFU产生10⁻¹⁰至10⁻¹¹个突变体的频率,分离出了4株对低水平头孢菌素3'-喹诺酮酯Ro 23-9424具有抗性的大肠杆菌K-12自发单步突变体。这些突变体对头孢菌素(头孢噻肟)和喹诺酮(氟罗沙星)成分均具有交叉抗性。因此,它们的孔蛋白发生了改变,并且复制性DNA生物合成对氟罗沙星具有抗性。用硝噻吩检测时,β-内酰胺酶活性没有增加,青霉素结合蛋白谱正常。

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Studies on the mode of action of nalidixic acid.萘啶酸作用模式的研究。
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