the addition of subinhibitory concentrations of the quinolone compound enoxacin or chloramphenicol did not influence the phenotypic beta-lactamase expression , neither in wild-type strains nor in their resistant counterparts , whereas the addition of clindamycin or gentamicin resulted in a marked decrease of enzyme production in cephalosporinase overproducers , the p. vulgaris and the p. rettgeri isolates .
C0597979
beta-lactamase
C0728805
cephalosporinase