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. 1966 Aug;92(2):358–365. doi: 10.1128/jb.92.2.358-365.1966

Mechanisms of Antibiotic Resistance Determined by Resistance-Transfer Factors1

Joel Unowsky a,2, Martin Rachmeler a
PMCID: PMC276249  PMID: 16562121

Abstract

Unowsky, Joel (Northwestern University Medical School, Chicago, Ill.), and Martin Rachmeler. Mechanisms of antibiotic resistance determined by resistance-transfer factors. J. Bacteriol. 92:358–365. 1966.—This study was concerned with the mechanism of expression of drug resistance carried by resistance-transfer (R) factors of two types: fi− (negative fertility inhibition) and fi+ (positive fertility inhibition). The levels of drug resistance determined by R factors used in this study were similar to those reported by other investigators. A new finding was that Escherichia coli carrying the fi− episome was resistant to 150 to 200 μg/ml of streptomycin. The growth kinetics of R factor-containing cells were similar in the presence or absence of streptomycin, chloramphenicol, and tetracycline, but a period of adaptation was necessary before cells began exponential growth in the presence of tetracycline. By use of radioactive antibiotics, it was shown that cells containing the fi− episome were impermeable to tetracycline and streptomycin, whereas cells containing the fi+ episome were impermeable only to chloramphenicol. Cell-free extracts from fi+ and fi− cells were sensitive to the antibiotics tested in the polyuridylic acid-stimulated incorporation of phenylalanine into protein.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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