Effects of DDVP at different period on enzyme activity in German cockroaches

  Objective   To investigate the effects on acety lcholine esterase, car box yester ase, acid-phosphatase, 1-NA and 2-NA activity in German cockro aches exposed to DDVP at different period.

  Methods   All enzyme activities were measured by visible spectrophotometry and SAS soft ware was used for statistical analysis.

  Results   With the prolonging exposed to DDVP, the degree of acetylcholine esterase inhibition increase gradually at the beg inning and decrease lately.The activity of acid-phosphatase raised generally.The change of carboxy esterase, 1-NA and 2-NA activity were in opposition to acetylcholine esterase activity's.

  Conclusion   A cetylcho line esterase was the main target enzyme of DDV P.Acid-phosphatase and 1-NA were the important metabolic enzymes.