Title : Resistance of Escherichia coli to penicillins: fine-structure mapping and dominance of chromosomal beta-lactamase mutations.

Pub. Date : 1977 Oct

PMID : 334718






1 Functional Relationships(s)
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1 The beta-lactamase-negative mutants isolated from ampA1-carrying strains (resistant to 10 microgram of ampicillin per ml) all carried genetic lesions very close to the ampA1 mutation, which was still present. Ampicillin beta-lactamase Escherichia coli