Klebsiella pneumonia strains moderately resistant to ampicillin and carbenicillin: characterization of a new β-lactamase
Klebsiella pneumoniae strain 11-03, moderately resistant to ampicillin and carbenicillin, produces one constitutive β-lactamase with an isoelectric point of 7.10 and a molecular weight of 20,000±500. The enzymatic activity is directed primarily against the penicillins, ...
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