Mg~(2+) (as MgSO_4) at 3.5 mmol/L remarkably increased ethanol tolerance of fusant SPSC. After 9 h of exposure to 20% (volume fraction) ethanol at 30 ℃, no viability remained for the control whereas 53.1% remained for the cells both grown and incubated in Mg~(2+)-added medium.
Thus, that Mg~(2+) enhances ethanol tolerance of this strain is closely related to its capability to reduce plasma membrane permeability of yeast cells under ethanol stress.
In order to compare the characteristics of ethano l production, a serie s respiratory deficient mutants (rho -) of Saccharomyces cerevisiae and the ir wil d parent strain (rho +) were assayed for ethanol yield, ethanol fermentation ki netics, ethanol tolerance, and activities of ethanol-dehydrogenase.
The results of determination of 8 strains' tolerance trait of alcohol, SO2, CO2, high concentration of glucose and wine brewing test showed mat strain A, B, C, F, H have good fermentation characters.
As far as the selected strains(C7, C8) were concerned, the traits of ethanol-tolerance, being osnophilic and producing ethanol were better than Cl, the analysis also showed that these abilities enhanced by the nuclear multiploidy increasing.
Comparative studies of growth rate and biomass, osmotic pressure and alcohol tolerance, and fermentation ability between the fusants and the parental strains showed that the fusants were quitely different from parental strains HU TY 1A and 5206 1B;
The low ethanol tolerance of thermophilic anaerobic bacteria, generally less than 2% (v/v) ethanol, is one of the main limiting factors for their potential use for second generation fuel ethanol production.
Ethanol-tolerant and thermo-tolerant yeast strain Saccharomyces cerevisiae C11-3 cells immobilized in calcium pectate and calcium alginate gels were used for ethanol fermentation in a three-reactor system with a gradient temperature control.
This paper described the general characteristics of S.cerevisiae 1450 and S. bayanus A_(m-1) including their morphological features, growth and physiological characteristics. The effect of ethanol concentration on cell viabili ty,growth rate as well as fermentation functions was also tested.The SO2 added to must effected the ADWY yeasts performance during the main fermentation. The temperature of the fermentation had obvious influence on the composition and flavour of wine made by both ADWY. The analytical ...
Several problems about the yeast of making seabuckthorn wine were studied. The seabuckthorns( Hippophae rhamnoides, L.)grow in Jianping county,Liao Ning province. The results showed that the 8792 yeast strain was separated and screened from wild yeast. The main property of this yeast stain was its tolerance to higher acidity.It could ferment even at pH 2.8-3.0 and its adaptable acid range was wide. This yeast stain had the characterastics of anti-SO_2, anti-alcohol and low residual sugar at the temperature ...
In this paper a simple, fast and practical way for testing the quality of wine active dry yeast introduced, and according to this way, we have tested five kinds of characteristic of threeactive dry yeasts, that is its active, the number of active cell, resist wine body, resist SO_2 level and wine quality.