A comparative study of the inhibitory effect of ethanol and substrates on the fermentation rate of parent and a respiratory-deficient mutant

The inhibitory effect of alcohol and substrates on the fermentation rate of one strain of Candida pseudotropicalis and of a respiratory-deficient mutant of this strain is investigated. For the parent strain maximum fermentative activity is identical in the presence of glucose or lactose. For a respiratory-deficient mutant, the fermentation rate is always higher than that of the parent strain. The inhibitory effect of alcohol and substrate is always less with the respiratory-deficient mutant than with the parent strain.