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The Gas Requirements of Molds. IV.¹ a Preliminary Interpretation of the Growth Rates of Four Common Mold Cultures on the Basis of Absorbed Gases^,2

Division of Dairy Husbandry, Agricultural Experiment Stations, State College of Washington, Pullman, Washington

ABSTRACT

With four common mold cultures, A. niger, P. expansum, A. flavus and O. lactis, grown on malt agar in various gas mixtures at different temperatures and pressures, it is shown that growth is affected according to the gas laws as they govern the solubility of the gases in the medium or mycelium.

The inhibiting effect of CO₂ on the growth of these molds is in proportion to its solubility and not in proportion to the composition of the gas above the medium or mycelium. This has been shown to apply by changing either the temperature or the pressure of the gas above the organism during growth. It would appear that the O₂ requirements of the molds might be affected in a similar way but this factor remains to be proved.

¹ Published as Scientific Paper No. 639, College of Agriculture and Experiment Station, State College of Washington.

² American Dairy Association Research Grant and in cooperation with the Washington State Dairy Products Commission.