助手读了剪贴板上的文字，“共同表达发酵单胞菌属PDC和ADH基因的大肠杆菌菌株的乙醇生产”。

“Ethanol Production by Escherichia Coli Strains Co-Expressing Zymomonas PDC and ADH Genes, ” said the aide, reading from a clipboard.

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主要介绍了膜醭酵母、醋酸菌、发酵单胞菌属细菌在苹果酒发酵和贮存中产生的危害及其控制措施。

The paper introduced the main hazard and the corresponding control measures in the cider fermentation and hoard using film yeast. Acetobacter and zymomonas strains.

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