有机磷农药对坛紫菜过氧化物酶(POD)活性影响的研究

用有机磷农药(甲胺磷、辛硫磷)分别在0.1,0.5,1,10,20mg/L浓度下对坛紫菜(Porphyrahaitanensis)暴污,不同时间(12h,24h,48h,72h)取样.测定甲胺磷、辛硫磷对坛紫菜叶状体过氧化物酶活性的影响.结果表明:随污染时间的延长,甲胺磷低浓度诱导POD活性,高浓度先诱导后抑制,并且浓度越大越早出现抑制;辛硫磷所有浓度均表现为先诱导后抑制的趋势.24h、48h、72h均出现比较良好的剂量 效应关系.污染暴露48h,相同条件下对POD活性的毒性大小为:辛硫磷>甲胺磷.

甲胺磷、辛硫磷对坛紫菜叶状体的生理效应

In this paper, the effects of methmidophos and phoxim with different concentrations and schedule on soluble protein content and chlorophyl a (Chla) content in Porphyra haintanensis were studied under experimental and ecological conditions. The results showed as follows: (1) there were some time-effect and dose-effect relationships between the pollutants and Chla contents. The Chla content of most of groups decreased with the increasing of dose and prolonging of the exposure time. In the same concentration, the toxicities of phoxim to Chla content was stronger than that of methmidophos. (2) All concentration groups in this study didn’t show the significant time-effect and dose-effect relationships between pollutants and the soluble protein. And there was no significant difference of the soluble protein content among various groups.

有机磷农药对坛紫菜叶状体核酸含量的影响

在实验生态条件下研究了不同浓度、不同时间甲胺磷、辛硫磷暴露对坛紫菜 (Porphyrahaitanensis)核酸 (RNA和DNA)含量的影响。结果表明,随着污染时间的延长 ,所有污染物对RNA、DNA含量的影响基本上表现为先上升后下降的时间效应关系 ,同一污染物浓度越大就越早出现下降。同时出现随暴露剂量的增加 ,RNA、DNA含量先上升后下降或全部下降的剂量 -效应关系。