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Dechlorane Plus(DP), a flame retardant used as an alternative to decabromodiphenylether, has been frequently detected in organisms, indicating its bioaccumulation and biomagnification potential in aquatic and terrestrial species. However, little data is available on the bioaccumulation of DP in amphibians. Dechlorane Plus and its analogs(DPs) were detected in the liver, muscle and brain tissues of wild frogs(Rana limnocharis), which were collected from an e-waste recycling site, Southeast China. DP, Mirex, Dec 602 and a dechlorinated compound of DP(anti-Cl11-DP) varied in the range of 2.01–291, 0.650–179, 0.260–12.4, and not detected(nd)–8.67 ng/g lipid weight, respectively. No difference of tissue distribution was found for syn-DP, Mirex and Dec 602 between the liver and muscle tissue(liver/muscle concentration ratio close to 1, p 0.05). However, higher retention was observed for anti-DP and anti-Cl11-DP in the frog muscle relative to the liver tissue(liver/muscle concentration ratio 1, p 0.05). Additionally, the blood-brain barrier was found to work efficiently to suppress these compounds entering brain tissues in this species(liver/brain concentration ratio 1, p 0.05), and the molecular weight was a key factor impacting the extent of the blood-brain barrier. Compared to levels in the muscle and brain tissue, a preferential enrichment of syn-DP was observed in the liver tissue, suggesting the occurrence of stereo-selective bioaccumulation in the wild frog. 相似文献
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"温水煮蛙"实验(美国康奈尔大学的科学家做过的一个著名实验:科研人员将一只青蛙丢进沸水中,青蛙奋力跳出锅外,安然逃生;之后,科研人员又把这只青蛙放进装满冷水的锅里,然后慢慢加温;起初青蛙在温暖惬意的水中悠然自得,直到感到水烫得无法忍受时,再想跃出水面却已四肢无力、欲跳不能了,最终青蛙被活活煮死在热水中)巧妙地道出习惯性违章在安全生产过程中的危害。由于行为人的安全意识不够、侥幸心理存在而引发的习惯性违章行为为安全事故的发生埋下了苗头,它是灾难发生的根源,严重威胁安全生产和人们生命 相似文献
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曾有人做过这样的实验：把两只青蛙分别放入已经烧开的水里和一锅刚烧温的水里,放入沸水锅里的青蛙会立即拼命蹦出来,而放入温水锅里的青蛙,由于水温适宜,不会立即蹦出锅外,虽然水在慢慢加热,青蛙也不会感到水温的明显增加,仍然在锅里无动于衷,温水煮沸,青蛙感到生命受到威胁时再想跳出锅,却已无能为力,结果被煮死。 相似文献
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