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排序方式: 共有126条查询结果,搜索用时 15 毫秒
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Dr Mitchell S. Golbus Joe Leigh Simpson Sarah E. Fowler Felix de la Cruz Robert J. Desnick Ronald Wapner David H. Ledbetter Herbert Lubs Maurice J. Mahoney Eugene Pergament George G. Rhoads Joseph D. Schulman Julia Zachary 《黑龙江环境通报》1992,12(5):373-376
Factors found to be associated with pregnancy loss after transcervical CVS were race (higher for non-white), history of spontaneous abortion, unplanned pregnancy, history of spotting or bleeding during the pregnancy prior to CVS, and placental position (higher for fundal or lateral locations). Whether the increase in loss risk is due to the factor, per se, or the factor plus the CVS cannot be determined due to the lack of appropriate control data. 相似文献
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Ines M.G. Vollhardt Teja Tscharntke Felix L. Wckers Felix J.J.A. Bianchi Carsten Thies 《Agriculture, ecosystems & environment》2008,126(3-4):289-292
Structurally complex landscapes may enhance local species richness and interactions, which is possibly due to a higher species pool in complex landscapes. This hypothesis was tested using cereal aphid parasitoids (Hymenoptera, Aphidiidae) by comparing 12 winter wheat fields in structurally complex landscapes (>50% semi-natural habitats; n = 6) and structurally simple landscapes dominated by agricultural lands (>80% arable land; n = 6). Surprisingly, landscape structural complexity had no effect on aphid parasitoid species diversity. In complex landscapes 12 and in simple landscapes 11 species were found; 9 species occurred in both landscape types. Hence, arable fields in high-intensity agricultural landscapes with little non-crop area can support a similar diversity of cereal aphid parasitoids as structurally complex landscapes. This finding suggests that cereal aphid parasitoids may find necessary resources even in simple landscapes, making generalisations concerning the relationship between landscape composition and biodiversity in arable fields difficult. 相似文献
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The Science of Nature - 相似文献
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F. Kiebitz G. Masing R. Grammel M. Herzberger Felix Jentzsch 《Die Naturwissenschaften》1928,16(8):132-136
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Georg Karlaganis Rachel Liechti Sirasak Teparkum Pavadee Aungkavattana Ramjitti Indaraprasirt 《毒物与环境化学》2019,101(7-8):339-368
AbstractDue to vast research programmes of industrial countries during the last two decades, our knowledge about the intrinsic properties of nanomaterials has increased considerably. However, ‘nanoregulation’ lags behind this progress. Key elements of nanoregulation are definition/scope and safety/consumer information. Safety information along the nano life-cycle is vital for the nanoparticle producer down to the industrial downstream user (product producer). However, nanodeclaration (in the sense of a label on the product for consumers) is not yet widely spread, in different geographic regions for different reasons. This is a case study for the EU, Switzerland, Thailand, the USA, and Intergovernmental Organisations. In addition, this study investigates inter- and governmental activities and the relationship between nanodeclaration and WTO rules. Non-compliance with WTO rules is a pretext for not introducing nanodeclaration in products. It is concluded that WTO rules do not exclude nanodeclaration. 相似文献