title: Quantitative relationship between sensitivity to beta-lactam antibiotics and beta-lactamase production in gram-negative bacteria--I. Steady-state treatment.
abstract: A simple graphical method is proposed to decide whether a decreased sensitivity to beta-lactam antibiotics can be explained by the sole increase of beta-lactamase production or if other factors such as outer membrane permeability or target sensitivity must also be involved. The parameters which are necessary for the analysis can easily be measured: the relative amounts of beta-lactamase produced by the various strains; the Km of the enzyme for the various beta-lactams under study and the susceptibility of each strain to the same antibiotics, measured as MIC values.
authors: Laboratoire d'Enzymologie, Université de Liège, Belgium.
authors: J M
authors: JM
authors: Frère
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000201:enzymology; D008433:Mathematics; D008826:Microbial Sensitivity Tests; D001618:beta-Lactamases / Q000096:biosynthesis*; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D047090:beta-Lactams; D001618:beta-Lactamases