STUDIES ON ETHANOL TOLERANCE IN FOUR YEASTS
关于四个酵母菌种对乙醇耐受性的研究

Four yeasts,Zygosaccharomyces bailii NCYC 1427,Saccharomyces cerevisiae NCYC 431,Hansenula anomala NCYC 711 and Kloeckera apiculata NCYC 468,were studied for their tolerance of ethanol with respect to viability,growth,fermentative ablilty and proton flux.The extent of ethanol inhibition of the above properties depended on the ethanol concentration.Z.bailii NCYC 1427 was the most tolerant organism,S.cerevisiae NCYC 431 was very tolerant to the inhibitory effect of ethanol on growth and viability.H. anomala NCYC 711 was sensitive to the effect of ethanol on growth,fermentative ability and proton flux.K.apiculata NCYC 468 was the most sensitive one to the effect of ethanol on viability,growth and fermentative ability.The results of this study indicated that ethanol inhibits growth,fermentative ability and proton flux more strongly than it inhibits viability,and environmental condition affected ethanol tolerance of organisms.