This rate of fall is of particular interest, and as it appears that certain deductions on the mode of action of penicillin can be drawn from the experiments, it is considered that it is worth ...

Synergism was not observed, but in some assays the action was significantly less than additive against resistant penicillinase-producing strains. Penicillin in combination with one of the new ...

This biphasic action—inhibition in high concentrations ... appears to be an expression of the same effect occurring with penicillin.