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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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Other references

Freedman S.O., 1969: Circulating carcino embryonic antigens. Clinical Research: 476

Shpak, N.I., 1979: Sclerogoniodialysis using a trephine for dissecting the scleral layers. Oftalmologicheskii Zhurnal 34(1): 54-56

Abu-Suboh Abadía, M.; Casellas, F.; Vilaseca, J.; Malagelada, J-R., 2004: Response of first attack of inflammatory bowel disease requiring hospital admission to steroid therapy. Introduction: corticoid administration is the usual treatment of Crohn's disease (CD) and ulcerative colitis (UC) attacks. However, information available on response rates and their predictive factors is scarce. Objective: to establish respon...

Migdadi, H.M.; Masoud, S.; Tell, A.M., 2004: Randomly amplified polymorphic DNA (RAPD) analysis of seven species of Aegilops. This study was carried out to determine the extent of genetic variation in seven Aegilops species at the DNA level: A. searsii, A. vavilovii, A. bicornis, A. kotschyi, A. ovata, A. cylindrica and A. triuncialis. A genetic similarity matrix based o...

Zechmeister, L.; Escue, R.B., 1942: New Stereoisomers Of Methylbixin. Science 96(2488): 229-230

Rozenbelov, Ae, 1981: Use of aerial testers as controlling automatic devices Testing cans for air tightness.1. Konservnaia i ovoshchesushil'naia promyshlennost': (8) 25-28

Yurtçu, Müslim.; Gürbüzer, N.; Findik, S.; Avunduk, M.Cihat.; Günel, E., 2009: Investigation of histopathologic changes in the ureter walls in vesicoureteral reflux. This study aimed to determine the histopathologic changes in ureteral walls (UWs) in children with vesicoureteral reflux (VUR). Twenty ureteral specimens taken from children were divided into 2 groups, refluxing (R) and control (C) groups, each co...

Perova N.V.; Chernysheva N.P.; Shcherbakova I.A.; Polesskii V.A., 1980: Cholesterol transport by different classes of lipo proteins and their apo lipo proteins in hypo alpha lipo proteinemia and hyper alpha lipo proteinemia. Journal of Soviet Cardiovascular Research 1(3): 224-228

Askenase, P.W.; Hayden, B.J.; Gershon, R.K., 1975: Augmentation of delayed-type hypersensitivity by doses of cyclophosphamide which do not affect antibody responses. Mice immunized with more SRBC than are required to produce optimal delayed-type hypersensitivity reactions, developed good antibody responses and poor delayed foot pad reactions. Cyclophosphamide treatment in low doses (20 mg/kg) before immunizati...

Maas, S., 2010: Caring collaborative. How residents of one Minnesota county joined forces to provide free medical services. Minnesota Medicine 93(2): 14-16