Screening out three yeasts that can asymmetric reduce COBE to S-isomer. They are 103 alcohol yeast, 106 beer yeast, 123 flour yeast.

• 筛选出三株具有不对称还原COBE 生成S-异构体的酵母菌,即103 酒精酵母,106 啤酒酵母,123 发面酵母。