[Metabolite excretion by yeasts of the genus Candida in media lacking sources of N, P, S, or Mg and having different carbon sources].

The purpose of this work was to study the effect produced by limiting the growth of yeasts belonging to the genus Candida on the excretion of cell metabolites. Changes in the composition and quantitative ratios between substances excreted depending on the carbon source (glucose, ethanol, hexadecane) and factors limiting growth of the cultures (N, P, S or Mg sources) were examined. It has been shown that (a) limitation of the yeast growth results in the majority of cases (but not always) in the excretion of macroquantities of these or other metabolites; (b) many microorganisms differ substantially from one another in their capacity to excrete metabolites; (c) the total number of metabolites found in the medium in macroquantities in different variants of the experiment is relatively small, and all of them belong to these or other intermediates of the oxidative metabolism of the carbon source (the acids of the citric acid cycle etc.) or are involved in the process of gluconeogenesis (polyols); (d) the composition and quantitative proportions of the excreted metabolites depend on the organism, carbon source and growth limiting factor.