two diffusion methods for determination of the beta-lactamase inhibitory activity of various compounds , i.e . the indicator method based on the direct contact of crystalline penicillinase with the experimental substrate and the method using a penicillinase-producing strain of staph . aureus 5a and various beta-lactamase-producing strains of bacteria without preliminary obtaining of beta-lactamase preparations were compared .
C0004611
bacteria
C0597979
beta-lactamase