排序方式： 共有46条查询结果，搜索用时 15 毫秒
1.
Organochlorine concentrations were measured in white-sided dolphins, pilot whales, and their prey from the Gulf of Maine and used to identify species, tissue, and gender differences, and trophic transfer trends, in bioaccumulation. Polychlorinated biphenyl concentrations ([PCB]) in dolphin blubber (13 +/- 7.1 micrograms/g fresh wt.) were twice those in pilot whales, but pesticide concentrations (20 +/- 13 micrograms/g fresh) were similar between species. 4,4'-DDE, trans-non-achlor, Cl6(153) and Cl6(138) concentrations were highest. Skin tissues had more recalcitrant organochlorines than the internal organs. Male dolphins bioaccumulated higher concentrations of nonmetabolizable PCBs and hexachlorocyclohexane (HCH) isomers, whereas pilot whales had no gender-related differences in bioaccumulation. Pilot whales, mackerel, and herring had proportionately higher concentrations of DDTs, whereas [PCB] were higher in dolphins and squid. Although these odontocetes feed at the same trophic level and store a similar suite of contaminants, dolphins bioaccumulated higher and potentially hazardous 4,4'-DDE and PCB concentrations from food in their more geographically restricted range. 相似文献
3.
4.
5.
6.
General Seismic Zoning Map of the USSR( GSZ- 78) ,included in the Building Code,inspite of relative improvement in comparison with previous ones( 1 937,1 95 7,1 96 8) ,is charac-terized by significantreduction of seismic hazard.In some regions strong earthquakes exceed-ing the predicted intensity occurred almost every year.Such cases in Kazakhstan are theearthquakes of Bakanasskoye( 1 979,M=1 4,I=6～ 7) and Zaysanskoye( 1 990 ,M=7.0 ,K=1 6 ,I=8) .Besides,there are territories that are … 相似文献
7.
本文介绍了朝鲜图门江（Ｔｕｍａｎｇａｎｇ）河口附近海水和底质沉积物中污染物分布研究的海洋考察结果。尽管在松软底质沉积物中发现某些高浓度的痕量金属和有机络合物 ,但图门江并不被认为是痕量金属（除Ｃｕ和Ｚｎ外）和ＤＤＴ的主要来源。另一方面在海洋环境中发现的氯化苯同分异构物（ａ -ＨＣＨ和ｒ-ＨＣＨ）揭示其由河流径流输送。建议在俄罗斯和朝鲜专属经济区内作进一步调查。由于朝鲜与俄罗斯联邦边界的政治敏感地位 ,图门江河口附近的日本／东海很少进行过调查。尽管如此 ,因ＴＲＡＤＰ（图门江河口区开发计划）的实施而引起远… 相似文献
8.
9.
10.