Being treated with the extracts for 24,48 and 72 h in vitro,the elimination rate of R plasmids was 0,1.8%and 3.4%respectively,while in SDS(sodium dode canesulphonate)control group the elimination rate was 0,0.8%and 1.6%respectively.

• 中药白头翁提取液体外作用24；48；72h后；R质粒消除率分别为0；1.；8%25；3