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The Gas Requirements of Molds. V. The Minimum Oxygen Requirements for Normal Growth and for Germination of Six Mold Cultures^{1, 2,}

Division of Dairy Husbandry, Agriculture Experiment Station, State College of Washington, Pullman

ABSTRACT

Most people assume that molds require abundant oxygen for growth, because molds usually are seen growing on the moist surfaces of substances. This, in a very general way, is correct but establishes no idea of the amount of oxygen required for normal growth or the amount required for germination of the many species of molds. The effect of the temperature and solubility of oxygen is even less understood.

The purpose of this study was to determine the minimum oxygen required for normal growth and the minimum oxygen required to permit germination of six pure cultures of mold in the presence of nitrogen and the almost complete absence of carbon dioxide. Since both temperature and gas pressure change the solubility of oxygen in the medium, several variations in both of these factors were included.

LITERATURE

The literature pertaining to much of the work on the gas requirements of molds has been reviewed by Golding (7, 8).

¹ Published as Scientific Paper no. 784, College of Agriculture and Experiment Stations, Institute of Agricultural Sciences, State College of Washington, Pullman.

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

³ The experimental data in this paper are taken from a thesis submitted by the senior author in partial fulfillment for the degree of Master of Science in Agriculture, 1948.