Some Effects of Ionized Air on Penicillium notatum*

Abstract

Exposure of Penicillium notatum to ionized air reduces the production of penicillin, negative ions exerting a greater effect than positive ions. Growth of the mycelium and germination of spores also are depressed, but positive ions exert a greater effect than negative ions on spore germination. Production of carbon dioxide is depressed to about the same extent as mycelial growth.