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排序方式: 共有891条查询结果,搜索用时 359 毫秒
731.
分析了某大型石化企业危化品道路运输安全管理存在的问题以及采取的对策,阐述了该企业的做法和取得的成效,为行业提供借鉴。 相似文献
732.
A 45,X/46,Xder(Y) mosaicism detected prenatally was shown to have a rare Y inversion- duplication or Y/Y translocation which can only be identified by a combination of high resolution cytogenetics and fluorescence in situ hybridization. The present data indicate the usefulness and importance of chromosome-specific probes in the identification and characterization of chromosome rearrangements. 相似文献
733.
734.
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736.
草制浆造纸中段废水处理及回用技术分析研究 总被引:2,自引:0,他引:2
中段废水是制浆造纸工业的主要污染源之一,从工程设计的角度出发,对草制浆造纸中段废水处理及回用提出一套可行适用的工艺方案;对主要工艺环节参数、设备备有说明,以供同行借鉴。 相似文献
737.
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739.
Wang D Hao Y Wang K Zhao Q Chen D Wei Z Zhang X 《Environmental science and pollution research international》2005,12(5):247-250
Background As the sole freshwater subspecies of finless porpoise (Neophocaena phocaenoides), the Yangtze finless porpoise (N. p. asiaeorientalis)
lives only in the middle and lower reaches of the Yangtze River and its appended Poyang and Dongting Lakes. As a result of
human activity on the river, including over and illegal fishing, pollution, transportation and dam construction, the population
of Yangtze finless porpoises has been steadily and rapidly decreasing during the past several decades, which leads the animal
to be endangered.
Methods For saving this unique animal from extinction, three corresponding measures, in situ conservation, ex situ conservation,
and intensifying breeding research in captivity, were proposed and have been implemented since the 1980s.
Results After successfully rearing the animals in captivity for almost nine years, the first Yangtze finless porpoise was successfully
born in captivity on July 5, 2005. The calf is male, with a body length of 69cm. This is the first freshwater cetacean ever
born in captivity.
Conclusion The successful birth of this calf confirms that it is possible to breed the Yangtze finless porpoise in captivity. Furthermore,
this will greatly benefit the conservation efforts, and also greatly bolster our on-going efforts to study the reproductivebiology
of these animals.
Recommendation More studies and efforts are expected to establish a sustainable, captive colony of the Yangtze finless porpoise, which will
not only greatly expand our knowledge about the reproduction biology of this animal, but also help to redeem the wild population
through a careful yearly 'soft releasing' process. 相似文献
740.
Dab W Ségala C Dor F Festy B Lameloise P Le Moullec Y Le Tertre A Médina S Quénel P Wallaert B Zmirou D 《Journal of the Air & Waste Management Association (1995)》2001,51(2):220-235
Many epidemiologic studies have observed, in different contexts, a slight short-term relationship between particles in air and cardiopulmonary mortality, even when air quality standards were respected. The causality of this relationship is important to public health because of the number of people exposed. Our aim was to make a critical assessment of the arguments used in 15 reviews of published studies. We explain the importance of distinguishing validity from causality, and we systematically analyze the various criteria of judgment within the context of ecologic time studies. Our conclusion is that the observed relationship is valid and that most of the causality criteria are respected. It is hoped that the level of exposure of populations to these particles be reduced. In Europe, acting at the root of the problem, in particular on diesel emissions, will also enable the reduction of levels of other pollutants that can have an impact on health. In the United States, the situation is more complicated, as particles are mainly secondary. It is also essential to continue with research to become better acquainted with the determinants of personal global exposures and to better understand the toxic role of the various physicochemical factors of the particles. 相似文献