久效磷对三角褐指藻的毒性

久效磷对饵料单胞藻－三角褐指藻有严重的生长抑制作用。在其毒害下，三角褐指藻细胞的超氧化物歧化酶和过氧化物酶活性降低，活性氧在细胞内大量积累，膜脂过氧化作用加强，膜透性增大，细胞内的电解质大量外漏，细胞严重受害。     

久效磷和氧化乐果对楸螟的毒力测定

该文采用久效磷和氧化乐果对钻蛀性害虫楸螟ＯｍｐｈｉｓａｐｌａｇｉａｌｉｓＷｉｌｅｍａｎ的毒力测定，测得久效磷的ＬＤ５０为０．２１３８μｇ／ｇ、氧化乐果的ＬＤ５０为０．０１７７μｇ／ｇ，害虫对该两种农药均很敏感。并提出了采取计算的方法解决供试虫种发育不一致的问题。在计算检测结果时，采用减少两端数值权重的处理方法，提高了检测的精确度。     

Biochemical alteration induced by monocrotophos in the blood plasma of fish, Channa punctatus (Bloch)

Monocrotophos (MCP), commonly known as azodrin, is one of the organophosphate (OP) pesticides extensively used in agricultural practices throughout the world. Channa punctatus were exposed to sublethal concentrations (0.96 and 1.86 mg/L) of monocrotophos for 15 and 60 days to assess the alterations in the level of some biochemical parameters in blood plasma. Significant alterations in all the biochemical parameters were found to be dose dependent. Hypoglycemia and hypocholesteremia were observed in plasma of fish at both exposure periods (15 and 60 days). Increased activities of glutamate-oxalacetate transaminase (GOT), glutamate-pyruvate transaminase (GPT), acid and alkaline phosphatase of blood plasma indicated hepatic tissue damage. Decrease in lactate dehydrogenase (LDH) content in plasma further indicated lower metabolic rate after 60 days of exposure. Significant decline in triglycerides content was observed in fish exposed to both sublethal concentrations of monocrotophos. We suggest that analysis of biochemical parameters in the fish blood may be useful in environmental biomonitoring.