Effect of Rate of Growth of Bacteria on Action of Penicillin.
Gladys L. Hobby, M. H. Dawson · Experimental Biology and Medicine · 1944
Conditions which increase the rate of growth of bacteria increase the rate at which penicillin acts. Conditions which decrease the rate of growth decrease also the rate at which penicillin acts. Penicillin is most effective when active multiplication takes place.