[The growth characteristics of the yeast Saccharomyces cerevisiae on media containing ethanol and saccharose].

Joint effect of various concentrations of alcohol and saccharose in the medium as well as the influence of temperature are studied under conditions of batch cultivation of Saccharomyces cerevisiae. It has been found that saccharose added to the medium in the amount exceeding 1% is assimilated less efficiently. So, it is not expedient to exceed the above concentration in industrial nutrient media with 10-12 vol. % of ethanol. The biomass yield within 18-22 degrees C depends only on the alcohol amount in the medium. A further rise in temperature to 35 degrees C induces its inhibitory effect ever growing with the ethanol concentration in the medium. Mathematical modeling shows basic regularities of the growth process which permit predicting behaviour of the culture in the studied factorial space. Optimal values of saccharose concentrations and cultivation temperature for the most efficient cultivation of yeast on the ethanol-containing medium are determined.