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首页> 外文期刊>Applied Microbiology >Comparison of the Survival and Metabolic Activity of Psychrophilic and Mesophilic Yeasts Subjected to Freeze-Thaw Stress
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Comparison of the Survival and Metabolic Activity of Psychrophilic and Mesophilic Yeasts Subjected to Freeze-Thaw Stress

机译：冻融胁迫下嗜温和中温酵母的存活和代谢活性比较

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摘要

A mesophilic yeast, Candida utilis, and a psychrophilic yeast, Leucosporidium stokesii, were subjected to freeze-thaw cycling over the range 25 to -60 C. Viability after freeze-thaw stress was directly correlated with the rate of cooling and the physiological age of the cultures. Rates of glucose fermentation and oxidation could be directly correlated with viability. The optimal cooling rate for both yeast strains was 4.5 to 6.5 C/min; however, their levels of survival obtained at this optimal cooling rate varied considerably. In addition, the psychrophile was less resistant to freeze-thaw stress than was the mesophile.
机译：在25至-60°C的温度范围内，对嗜温酵母（Candida utilis）和嗜温酵母（Leucosporidium stokesii）进行冻融循环。冻融胁迫后的生存力与降温速率和生理年龄直接相关。文化。葡萄糖发酵和氧化的速率可能与生存能力直接相关。两种酵母菌株的最佳冷却速率为4.5至6.5 C / min。但是，在这种最佳冷却速率下获得的生存水平差异很大。此外，嗜冷菌对耐冻融压力的抵抗力低于嗜温菌。

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