[Comparative study of the physiological and biochemical characteristics of the varying ploidy of Saccharomyces cerevisiae strains in the process of their growth].

The growth of Saccharomyces cerevisiae strains having different ploidy was compared in the conditions of periodic cultivation, and was found to consist of two stages: (1) at the account of glucose utilization and (2) due to assimilation of cellular metabolites following a period of adaptation. The secondary growth was linear. The haploid, diploid and triploid strains differed in the character of growth, substrate utilization, the rate of respiration and the economic coefficient. Their qualitative protein composition was the same though certain changes were detected in the content of individual amino acids. The amount of essential amino acids (their sum) in proteins increased when the yeast started to oxidize cellular metabolites instead of glucose utilization.