ascendent

Results The earlier period apoptosis rate of thymocyte in the experimental group were higher than the control ( P < 0.05), and had ascendent tendency with the dose raised, the Fas protein expression in experimental group was stronger than the control ( P < 0.05).

结果低、中和高剂量组，胸腺细胞的早期凋亡率高于对照组P<0.05，且有随剂量增加而升高的趋势，Fas蛋白阳性表达率在染毒组亦强于对照组P<0.05。

PCR ( polymerase chain reaction) technology is specific, sensitive, simple and rapid. Research on detecting pathogenic bacteria in food by PCR technology is ascendent.

PCR（聚合酶链式反应）技术具有特异性强、灵敏度高、操作简单、快速的特点，使用PCR技术检测食品中致病菌的研究方兴未艾。