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  • 1
    ISSN: 1432-0983
    Keywords: Key wordsSchizosaccharomyces pombe ; Thermal resistance ; Cyclic AMP ; Trehalose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heat sensitivity at 48°C was determined in log-phase cultures of control and pka1-disrupted cells of the fission yeast Schizosaccharomyces pombe grown at 25°C. Cells devoid of protein kinase A exhibited a considerable heat-shock resistance as compared to control cells. Addition of cAMP to control cells prompted a further decrease in viability during heat shock. This effect was not observed with pka1-disrupted cells, suggesting that cAMP-dependent phosphorylation is involved in modulation of the heat-shock response. When control or pka1-disrupted cells were grown at 25°C and then shifted to 37°C they acquired thermo-tolerance to a subsequent treatment at 48°C both in the absence and in the presence of exogenous cAMP. Inhibition of protein synthesis during the adaptive treatment did not block the development of thermo-tolerance. However, the arrest in translation significantly prevented trehalose accumulation in control cells but only slightly affected trehalose increase in pka1-disrupted cells. These data indicate that heat resistance may be established in growing cells of S. pombe by at least two independent post-translational mechanisms: a decrease in cAMP-dependent protein phosphorylation and a hitherto unknown process which may be independent of trehalose accumulation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-0972
    Keywords: Curing ; fermentative behaviour ; killer ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Fermentative behaviour and cell growth have been studied in grape juice inoculated either with two killerSaccharomyces cerevisiae wild strains or with their Acridine Orange-cured isogenic counterparts. The number of viable cells/ml at the beginning of the fermentation, as well as during exponential growth, were higher in grape juices inoculated with the cured strains. The CO2 production, fermentative rate and ethanol and acetic acid production were also higher in the cured strains, particularly during the stage of active fermentation. These differences, however, were minimal at the end of the fermentations.
    Type of Medium: Electronic Resource
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