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首页> 外文期刊>Environmental toxicology and chemistry >DISTRIBUTION AND EXCRETION OF Cd, Hg, METHYL-Hg AND Zn IN THE PREDATORY BEETLE PTEROSTICHUS NIGER (COLEOPTERA: CARABIDAE)
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DISTRIBUTION AND EXCRETION OF Cd, Hg, METHYL-Hg AND Zn IN THE PREDATORY BEETLE PTEROSTICHUS NIGER (COLEOPTERA: CARABIDAE)

机译：Cd，Hg，甲基-Hg和Zn在捕食性甲虫斜纹夜蛾（Coleoptera：CARABIDAE）中的分布和排泄

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Excretion and distribution of cadmium (Cd), mercury (Hg), methylmercury (methyl-Hg), and zinc (Zn) were studied in the predatory beetle, Pterostichus niger. Specimens of P. niger were fed with insect larvae containing ~(109)Cd, ~(203)Hg, methyl~(203)Hg, or ~(65)Zn. After ingestion of the larvae, the metal contents in the beetles were measured daily for 30 d by γ-spectrometry. Additional beetles were used for autoradiography 5,15, and 19 d after ingestion of the metals. Excretion of the metals was fast during an initial interval but occurred thereafter at a slow rate. After 2 weeks, the contents of Cd and inorganic Hg had decreased to approximately 1% of the ingested amounts. For Zn and methyl-Hg, higher levels were retained in the beetles. Thus, after 30 d, Zn content was 20% of the ingested amount, whereas for methyl-Hg 60% was retained in the body. Autoradiography showed high levels of all metals in the gut. For methyl-Hg, in contrast to inorganic Hg, there was also an evenly distributed labelling in most body tissues. This labelling was also seen for Zn, although at a lower level than for methyl-Hg. Cadmium showed a localisation in the integument, which was not seen for the other metals. Our results show that patterns of uptake and excretion of the examined metals in P. niger vary considerably and that the distribution pictures show specific features for the individual metals.
机译：在捕食性甲虫Pterostichus niger中研究了镉（Cd），汞（Hg），甲基汞（甲基-Hg）和锌（Zn）的排泄和分布。用含有〜（109）Cd，〜（203）Hg，甲基〜（203）Hg或〜（65）Zn的昆虫幼虫喂食黑粉虱标本。摄取幼虫后，每天用γ光谱法测定甲虫中金属含量30天。摄取金属后，在第5,15和19 d使用其他甲虫进行放射自显影。在最初的时间间隔内，金属的排泄速度很快，但此后以缓慢的速度发生。 2周后，Cd和无机Hg的含量下降到摄入量的1％左右。对于锌和甲基汞，甲虫中的含量更高。因此，在30 d后，锌含量为摄入量的20％，而甲基汞中的锌含量为60％保留在体内。放射自显影显示肠道中所有金属的含量很高。对于甲基汞，与无机汞相反，在大多数人体组织中也有均匀分布的标记。锌也可见到这种标记，尽管其含量低于甲基汞。镉在被膜中显示出局部化，其他金属则未见。我们的结果表明，被检测的金属在黑假单胞菌中的摄取和排泄模式差异很大，并且分布图显示了每种金属的特定特征。

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