搜索结果: 1-2 共查到“微生物学 Occurrence”相关记录2条 . 查询时间(0.078 秒)
Potential hazard of simultaneous occurrence of aflatoxin B-1 and ochratoxin A
mycotoxins residua cereals
2015/1/20
Contents of aflatoxin B1 (AFB1) and ochratoxin A (OA) in the samples of wheat and barley were detected by RIA method. Average contents of AFB1 in the samples of wheat and barley were 2.4 μg/kg and 2.2...
大肠杆菌FC40系统静止期突变中的F因子转移The Occurrence of Actual F Factor Transfer during the Stationary-phase Mutation in Escherichia coli FC40
大肠杆菌FC40系统 适应性突变 F因子转移
2007/12/31
摘要本研究采用大肠杆菌GM133 rifr细胞和营养收集细胞HB214 strr进行适应性突变实验。在混合30min和2d 后添加链霉素杀死GM133基因型细胞，继续培养5d后，在选择平板上出现了一定数量的lac+strr基因型回复突变菌落。根据这些突变菌落的数量，估计在lac+突变产生之前，GM133和HB214细胞之间的接合频率分别为0.07%和7.47%。在培养了7d的选择平板上添加含链霉素...