Results:The mean recoveries in Bacillus subtilis, Escherichia coli and Aspergillus niger were 59%, 62% and 66% respectively, the recoveries in the rest strains were above 70% by conventional method.

结果：采用常规法，仅有枯草牙孢杆菌、大肠埃希菌和黑曲霉的平均回收率分别为59%，62%和66%，其余各菌株试验组回收率均大于70%；

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Results:The mean recoveries in Bacillus subtilis, Escherichia coli and Aspergillus niger were 59%, 62% and 66% respectively, the recoveries in the rest strains were above 70% by conventional method.

结果：采用常规法，仅有枯草牙孢杆菌、大肠埃希菌和黑曲霉的平均回收率分别为59%，62%和66%，其余各菌株试验组回收率均大于70%；

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