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The Gas Requirements of Molds. III. The Effect of Various Concentrations of Carbon Dioxide on the Growth of Penicillium Roqueforti (Three Strains Originally Isolated from Blue-Veined Cheese) in Air^*

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

ABSTRACT

INTRODUCTION

This study is a continuation of previous studies (6, 7) to determine the significance on the growth of strains of P. roqueforti of various concentrations of CO₂ in the air at different temperatures. It was considered that the previous study (6) did not fully cover the range of possible dilutions of air with CO₂, or the range of the temperatures of growth of the strains of P. roqueforti used.

Therefore, the object of this study was to determine to what extent the addition of CO₂ to air affects the growth of strains of P. roqueforti at various temperatures of growth.

The complementary paper to this study "The oxygen requirements of Penicillium roqueforti in the presence of nitrogen as diluent, and the absence of carbon dioxide" (7) reported experiments conducted with practically identical methods. Thus, the results are directly comparable with one another and permit a close estimate of the relative significance of various concentrations of oxygen, nitrogen and carbon dioxide on the growth of P. roqueforti at different temperatures.

^* Published as Scientific Paper No. 455, College of Agriculture and Experiment Station, State College of Washington.

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