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  • Genetics  (6)
  • Life and Medical Sciences  (6)
  • chemostat  (1)
  • Kluyver effect
  • mitochondria
  • 1985-1989  (6)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A comparative radiorespirometric study of glucose metabolism in yeasts (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 2 (1986), S. 117-121 
    Details
    ISSN: 0749-503X
    Keywords: Hexose monophosphate pathway ; NADPH ; radiorespirometry ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A comparative radiorespirometric study of glucos emetabolism in glucose-limited chemostat cultures of Saccharomyces cerevisiae, Candida utilis and Rhodosporidium toruloides was performed in an attempt to estimate the contribution of the hexose monophosphate (HMP) pathway to glucose metabolism. Radioactively labelled glucose was administered directly to the cultures in a constant substrate feed, without disturbance of the steady state. The 14CO2 yields from [1-14C]- and [6-14C]-glucose demonstrated that the HMP pathway activities for the three yeasts were very similar. Furthermore, a quantitative analysis of results indicated that the HMP pathway activities were close to the theoretical minimum needed to cover the NADPH requirement for biomass formation.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320020207
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of enzymes which reduce dihydroxyacetone and related compounds in hansenula polymorpha CBS 4732 (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 4 (1988), S. 117-126 
    Details
    ISSN: 0749-503X
    Keywords: Yeasts ; dihydroxyacetone ; acetoin ; diacetyl ; acetol ; methylglyoxal, acetone ; glycerol ; 1,2-propanediol ; 2,3-butanediol ; dehydrogenase ; reductase ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Hansenula polymorpha CBS 4732 grown on a variety of substrates contained very high activities of enzymes catalyzing the NADH-linked reduction of dihydroxyacetone, acetoin, diacetyl, acetol, methylglyoxal and acetone. The enzymes catalyzing these reductions have been purified and their kinetic properties are described. Three different enzymes were found responsible for the above-mentioned activities, namely: (1) dihydroxyacetone reductase; (2) acetone reductase; and (3) alcohol dehydrogenase.So far, the physiological function of dihydroxyacetone reductase and acetone reductase is obscure. The kinetic properties of dihydroxyacetone reductase and the regulation of the synthesis of this enzyme suggest that it does not function as a glycerol dehydrogenase.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320040205
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  • 3
    Electronic Resource
    Electronic Resource
    Purification and properties of dihydroxyacetone reductase and 2,3-butanediol dehydrogenase from Candida utilis CBS 621 (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 4 (1988), S. 127-133 
    Details
    ISSN: 0749-503X
    Keywords: Dihydroxyacetone reductase ; 2,3-butanediol dehydrogenase ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Candida utilis CBS 621 contained four different enzymes capable of reducing carbonyl compounds such as dihydroxyacetone, acetoin, diacetyl, acetol, methylglyoxal and acetone, namely alcohol dehydrogenase, acetone reductase, dihydroxyacetone reductase and 2,3-butanediol dehydrogenase. The dihydroxyacetone reductase of C. utilis did not oxidize glycerol, thus providing evidence that this enzyme cannot function as a glycerol-2-dehydrogenase during growth of the yeast on glycerol. This enzyme may, however, play a role in the assimilation of 2,3-butanediol by C. utilis. The organism also contained a separate 2,3-butanediol dehydrogenase which was unable to reduce dihydroxyacetone. Both dihydroxyacetone reductase and 2,3-butanediol dehydrogenase were present at very high activities during growth of C. utilis on a variety of substrates, including 2,3-butanediol.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320040206
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  • 4
    Electronic Resource
    Electronic Resource
    Alcoholic fermentation by ‘non-fermentative’ yeastsCentraalbureau voor Schimmelcultures, Yeast Division, Delft, The NetherlandsDedicated to Dr Nelly J. W. Kreger-van Rij. (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 2 (1986), S. 123-127 
    Details
    ISSN: 0749-503X
    Keywords: Yeasts ; fermentation ; ethanol ; Durham tube test ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: All type strains of ‘non-fermentative’ yeasts, available in the culture collection of the Centraalbureau voor Schimmelcultures, were reinvestigated for their capacity to ferment glucose in the classical Durham tube test. Although visible gas production was absent, nearly all strains produced significant amounts of ethanol under the test conditions. Under conditions of oxygen-limited growth, even strong alcoholic fermentation may occur in a number of yeasts hitherto considered as non-fermentative. Thus, shake-flask cultures of Hansenula nonfermentans and Candida silvae fermented more than half of the available sugar to ethanol. It is concluded that the taxonomic test for fermentation capacity, which relies on detection of gas formation in Durham tubes, is not reliable for a physiological classification of yeasts as fermentative and non-fermentative species.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320020208
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics of growth and glucose transport in glucose-limited chemostat cultures of Saccharomyces cerevisiae CBS 8066 (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 5 (1989), S. 159-165 
    Details
    ISSN: 0749-503X
    Keywords: Crabtree effect ; sugar transport ; growth kinetics ; yeast ; chemostat ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The glucose transport capacity of Saccharomyces cerevisiae CBS 8066 was studied in aerobic glucose-limited chemostat cultures. Two different transport systems were encountered with affinity constants of 1 and 20 mM, respectively. The capacity of these carriers (Vmax) was dependent on the dilution rate and the residual glucose concentration in the culture. From the residual glucose concentration in the fermenter and the kinetic constants of glucose transport, their in situ contribution to glucose consumption was determined. The sum of these calculated in situ transport rates correlated well with the observed rate of glucose consumption of the culture.The growth kinetics of S. cerevisiae CBS 8066 in glucose-limited cultures were rather perculiar. At low dilution rates, at which glucose was completely respired, the glucose concentration in the fermenter was constant at 110 μM, independent of the glucose concentration in the reservoir. At high dilution rates, characterized by the occurrence of both respiration and alcoholic fermentation, the residual substrate concentration followed Monod kinetics. In this case, however, the overall affinity constant was dependent on the reservoir glucose concentration.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320050305
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  • 6
    Electronic Resource
    Electronic Resource
    Metabolic responses of Saccharomyces cerevisiae CBS 8066 and Candida utilis CBS 621 upon transition from glucose limitation to glucose excess (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 4 (1988), S. 283-291 
    Details
    ISSN: 0749-503X
    Keywords: Crabtree effect ; respiration ; fermentation ; Saccharomyces ; Candida ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: When chemostat cultures of Saccharomyces cerevisiae CBS 8066 and Candida utilis CBS 621, grown under glucose limitation, were pulsed with excess glucose, both organisms initially exhibites similar rates of glucose and oxygen consumption. However, striking differences were apparent between the two yeasts with respect to the production of cell mass in the culture and metabolic excretion. Upon transition from glucose limitation excess, S. cerevisiae produced much ethanol but growth rate close to that under glucose limitation. C. utilis, on the other hand, produced little ethanol and immediately started to accumulated cell mass at a high rate. This high production rate of protein synthesis.Upon a glucose pulse both yeasts excreated pyuvate. In contrast to C. utilis. S. cerevisiae also excerted various tricarboxylic acid cycle intermediates, both under steady-state conditions and after exposure to glucose excess, These results and those of theoritical calculations on ATP flows support the hypothesis that the ethanol production as a consequences of pyruvate accumulatiion in S. cerevisiae, occuring transition from glucose limitaion to glucose excess, is caused by a limited capacity of assimilatory pathways.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320040406
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