全文获取类型
收费全文 | 273篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
废物处理 | 5篇 |
环保管理 | 23篇 |
综合类 | 128篇 |
基础理论 | 45篇 |
污染及防治 | 61篇 |
评价与监测 | 10篇 |
社会与环境 | 2篇 |
出版年
2013年 | 6篇 |
2012年 | 4篇 |
2011年 | 5篇 |
2010年 | 8篇 |
2009年 | 11篇 |
2008年 | 5篇 |
2007年 | 7篇 |
2006年 | 8篇 |
2005年 | 13篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 3篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1965年 | 4篇 |
1964年 | 2篇 |
1963年 | 2篇 |
1962年 | 4篇 |
1961年 | 7篇 |
1960年 | 7篇 |
1959年 | 6篇 |
1958年 | 4篇 |
1957年 | 5篇 |
1956年 | 8篇 |
1955年 | 6篇 |
1954年 | 5篇 |
1953年 | 7篇 |
1951年 | 5篇 |
1950年 | 2篇 |
1947年 | 3篇 |
1942年 | 2篇 |
1941年 | 3篇 |
1939年 | 2篇 |
1934年 | 2篇 |
1931年 | 2篇 |
排序方式: 共有274条查询结果,搜索用时 31 毫秒
31.
32.
33.
34.
35.
Kaluzhnaya OV Belikov SI Schröder HC Wiens M Giovine M Krasko A Müller IM Müller WE 《Die Naturwissenschaften》2005,92(3):134-138
In a preceding study it has been reported that the freshwater sponge Lubomirskia baicalensis, living in Lake Baikal (East Siberia), is composed of spicules forming a characteristic pattern which follows radiate accretive growth. Here we report that the spicules are synthesized by the enzyme silicatein, a protein which is related to cathepsin L. The cDNAs for silicatein and the related cathepsin L were isolated and used as probes to show that the mRNA levels of silicatein in the bases of the spicule skeleton of the animals are low, while the mRNA level of cathepsin L in this region exceeds that of the growing zone. This is the first comprehensive study on the importance of the axial filament/silicatein as an essential structural and functional component determining the growth and stability of demosponge spicules.Note: Sequences from Lubomirskia baicalensis have been deposited in the EMBL/GenBank; cDNAs for the putative silicatein (LBSILICA) are deposited under the accession no. AJ786771 and for cathepsin L (LBCATL) under the accession no. AJ786770. 相似文献
36.
37.
Surfaces of many sports fields, playgrounds and paths in Germany are covered with red slag ?Kieselrot”. Kieselrot is extremely high contaminated by polychlorinated dibenzodioxines and dibenzofurans. Mean PCDD/F-concentration in surface layers of 35 locations in Hessen is 45 500 ng I-TE/kg. PCDD/F-contents range from 1 000 to 250 ng I-TE/kg within 10 cm under surface layers and from 6 000 to 600 ng I-TE/kg in top soils of three metres wide peripheral areas. Concentration in subsoils is a function of depth (n=18, r=?0,741), concentration in topsoils of peripheral areas is a function of distance from large sports fields (n=14, r=?0,881) or small sportsfields (n=23, r=?0,742), respectively. A 15 metres wide and 10 centimetres deep peripheral area contains 0,8 g I-TE PCDD/F. The pollution of surroundings and further observations indicate that ?Kieselrot-areas” must be regarded as important dioxin sources. 相似文献
38.
Karsten Grunewald Christiana Unger Heinz -Jürgen Brauch Wido Schmidt 《Environmental Sciences Europe》2004,16(1):7-14
Objective
Flood sediments were investigated due to the extreme flood situation around Dresden in August 2002Method
The samples have been analyzed by screening inorganic and organic pollutants.Results
It was observed that As, Pb, Cd, Zn, Cu, B and other heavy metals as well as DDT, PCB and Benzo [a] pyren were significantly enriched.Conclusion
Depending on geogenic and anthropogenic impacts, the spatial distribution of these contaminants was different. Organic compounds were dislocated down stream from Czech Republic along the Elbe River. Because of the old ore mining, samples near the Mulde and Wei\eritz Rivers showed high metal pollution.Perspective
More detailed and systematic investigations should be undertaken in the Elbe and Mulde river systems. 相似文献39.
40.