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Contribution to the study of the assimilation of some organic substances by yeasts

, : Contribution to the study of the assimilation of some organic substances by yeasts. Mycopathol Mycol Appl 33(2): 113-124

Yeast systematics are rendered difficult by the lack of sufficiently numerous and constant morphological criteria. To overcome this difficulty, physiological characteristics have to be used. To this end, a study was made of the assimilation of various C compounds by strains chosen as representative of a whole group of yeasts. The compounds can be classified in 2 categories. The first includes a-cetoglutaric acid, oxalacetic acid, and dihydroxyacetone. They are assimilated in accordance with the classical scheme of the tricarboxylic acid cycle. Starting from these substrates, growth proceeds normally for all the strains if the acidity of the medium is between pH 3 and pH 6. In the 2nd group, potassium acetate, glycolic acid, glyoxylic acid, potassium oxalate, and glycine are metabolized according to pathways which have important steps in common. In fact, the 1st reactional sequences all lead to the formation of glyoxylic acid. On the whole, certain homogeneity of growth results. Two Pichia spp. show no appreciable difference. The same is true of Pachysolen tannophilus, Hansenula anomala, Candida melinii, Sporobolomyces salmonicolor, and Pullularia pullulans, which are all positive nitrates strains. On the other hand, the heterogeneity of the genus Candida is rediscovered when the results obtained with the species melinii and humicola are compared. It is noted that Kloeckera apiculata is the only strain incapable of assimilating any of the compounds under study except dihydroxyacetone. Only glycine and isobutanol could be used for systematic purposes, since only 5 strains are capable of assimilating the amino acid, and 2 utilize isobutylic alcohol.


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