摘要
对从土壤中筛选到的酵母菌Ｙ－９６０１ 株进行了形态培养特征及生理生长特性的研究．该菌株以多边芽殖方式进行无性繁殖，形成子囊孢子．在无维生素培养基上不生长．同化和发酵萄葡糖、半乳糖、蔗糖、麦芽糖、１／３ 棉子糖，不同化乳糖及硝酸钾．同化淀粉、纤维二糖及Ｄ－木糖能力强，对淀粉具有较强的酒精发酵能力，鉴定为酵母属糖化酵母种．其最适生长温度为３０～３４ ℃，最适生长ｐＨ 值为５．０～６．０，在麦芽汁中液体培养倍增时间为９０ ｍ ｉｎ．
The morphology,cultural characteristics and physiological feature of the yeast Y 9601, which was isolated from soil, were studied. The strain reproduced vegetatively by budding multilatorally, forming ascospores. It could assimilate and ferment glucose,galactose, sucrose,maltose and 1/3 raffinose respectively, but couldn't assimilate lactose, potassium nitrate or grow on vitamin free medium. It has a strong ability to assimilate starch, cellbiose and D xylose and a high ethanol productivity from starch. The strain was identified as a species of Saccharomyces diastaticus. The optimal growth pH and temperature were 5.0~6.0and 30~34 ℃.The doubling time is 90 minutes in the wort liquid culture.
基金
江苏省环保资助!项目(编号98007)
