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J Bacteriol. 1972 May; 110(2): 529-537
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Properties of an R Factor Which Originated in Pseudomonas aeruginosa 1822

¹ Department of Bacteriology, The Medical School, University Walk, Bristol BS8 1TD, England

ABSTRACT

RP1, a group of genes specifying resistance to carbenicillin, neomycin, kanamycin, and tetracycline and originating in a strain of Pseudomonas aeruginosa, was freely transmissible between strains of P. aeruginosa, Escherichia coli, and Proteus mirabilis. Acquisition of the multiple drug resistance specified by RP1 by these strains was accompanied by acquisition of an extrachromosomal satellite of covalently closed circular deoxyribonucleic acid of molecular weight about 40 million daltons and of buoyant density 1.719 g/cm³ (60% guanine plus cytosine).

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