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J Bacteriol. 1962 November; 84(5): 902-910
Copyright © 1962, The Williams & Wilkins Company. All Rights Reserved.

CONJUGAL FERTILITY ASSOCIATED WITH RESISTANCE FACTOR R IN ESCHERICHIA COLI

Department of Biology, School of Science, Osaka University, Osaka, Japan

ABSTRACT

SUGINO, YOSHINOBU (Osaka University, Osaka, Japan) AND YUKINORI HIROTA. Conjugal fertility associated with resistance factor R in Escherichia coli. J. Bacteriol. 84:902–910. 1962.—The introduction of the contagious drug-resistance factor, R, into an F^– strain of Escherichia coli allows the R⁺F^– strain to mate with F^–R^– strains. The chromosome fragment transferred from the R⁺ cell is relatively large, comparable to the conjugation between F⁺ or Hfr male and F^– female bacteria. The complex R factor has been analyzed by transduction with phage Pl. Within the R factor, the fertility determinant is inseparable from the determinant responsible for its infectivity, but can be separated from the loci for drug resistance. R thus resembles the category of complex F factors (F-primes) previously analyzed.

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