Abstract
Conclusions
1. Penicillium notatum grows well on nutrient broth and Amigen at pH 4.5. The growth is superior to that obtained on a modified Czapek-Dox medium. 2. The nature of the growth as well as the persistence of an antibacterial substance in the media is, in part, dependent upon the pH of the media. 3. Lactose added to broth cultures in a concentration of 5% considerably increased the inhibitory titer which persisted for as long as 30 days. 4. A bacteriostatic substance was extracted from the thallus of Penicillium notaturn with ethyl alcohol.
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