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在静水系统中用不同浓度的杀螟松处理食蚊鱼 96 h分别于第 2 4、4 8和 96 h测定脑乙酰胆碱酯酶(ACh E)的活性。另一些鱼在接触杀螟松之前分别用胡椒基丁醚 (PBO)和磷酚三苯酯 (TPP)做预处理。结果表明 ,在 0 .4 mg/ L和 1.3mg/ L的亚致死浓度下 ,杀螟松对 ACh E活性的抑制率分别为 4 4 .2 %和 6 5.7%与用杀螟松单独处理的鱼相比 ,TPP预处理的鱼 ACh E活性更低 ,而 PBO处理后的鱼 ACh E活性较高。本项研究还测定了鱼经过 96 h杀螟松处理再移到清水中之后 ACh E的恢复情况。经过 8d的恢复期 ,用杀螟松单独处理和经 TPP处理的鱼 ,其 ACh E仍低于对照。
The mosquitoes were treated with different concentrations of fenitrothion for 96 h in the still water system at the 2nd, 4th, 8th, and 96th hour, respectively. The activity of acetylcholinesterase (AChE) was determined. Other fish were pretreated with piperonyl butoxide (PBO) and phospholiphenol (TPP) before contacting fenitrothion. The results showed that the inhibitory rates of fenitrothion on ACh E activity at sub-lethal concentrations of 0.4 mg / L and 1.3 mg / L were 44.2% and 67.5%, respectively, compared with those treated with fenitrothion alone Compared with fish, TPh pretreated fish had lower ACh E activity, while PBO treated fish had higher ACh E activity. The study also measured the recovery of ACh E after the fish was treated with fenitrothion for 96 h and then moved to clear water. After 8 days of convalescence, AChE was still lower than the control with fenitrothion alone and TPP-treated fish.