全文获取类型
收费全文 | 392篇 |
免费 | 0篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 4篇 |
环保管理 | 27篇 |
综合类 | 302篇 |
基础理论 | 21篇 |
污染及防治 | 34篇 |
评价与监测 | 4篇 |
社会与环境 | 1篇 |
出版年
2013年 | 4篇 |
2012年 | 4篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2004年 | 5篇 |
2003年 | 4篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1975年 | 10篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1971年 | 6篇 |
1970年 | 6篇 |
1968年 | 11篇 |
1967年 | 6篇 |
1966年 | 6篇 |
1965年 | 6篇 |
1964年 | 8篇 |
1963年 | 11篇 |
1962年 | 5篇 |
1961年 | 13篇 |
1960年 | 8篇 |
1959年 | 7篇 |
1958年 | 12篇 |
1957年 | 7篇 |
1956年 | 5篇 |
1955年 | 8篇 |
1954年 | 6篇 |
1943年 | 5篇 |
1941年 | 5篇 |
1939年 | 4篇 |
1938年 | 5篇 |
1937年 | 4篇 |
1935年 | 4篇 |
1934年 | 4篇 |
1928年 | 5篇 |
1923年 | 6篇 |
1919年 | 5篇 |
1915年 | 3篇 |
1914年 | 6篇 |
1913年 | 5篇 |
排序方式: 共有396条查询结果,搜索用时 187 毫秒
101.
102.
103.
104.
105.
106.
Life-cycle phases of a zinc- and cadmium-resistant ecotype of Silene vulgaris in risk assessment of polymetallic mine soils 总被引:5,自引:0,他引:5
Short-term exposure of plants to heavy metals is often used for risk assessment of metal-enriched soils (OECD guideline 208) without considering the reliability of the assessment for long-term exposure, i.e. for the completion of a plant's life-cycle. In the present study with 15 orogenic soils three phases of the life-cycle of a Zn-Cd-resistant ecotype of Silene vulgaris were studied to improve risk assessment of metal-enriched soils. The first phase, i.e. emergence of seedlings was not related to the water-soluble or total metal concentration of the soils. Seedling mortality was low as long as the water-soluble metal concentration did not surpass 0.15 micromol Zn and 0.04 micromol Cu g(-1) dry soil. Curtailment of the life-cycle prior to flowering, i.e. the vegetative growth as second phase, occurred on those soils where roots and shoots were heavily enriched by Zn already in the seedling phase. In the third phase, i.e. the generative phase, time to flowering and yield differences between orogenic soils were substantial, but soil metal concentrations could not be directly related to timing of reproduction or biomass. Ranking of data showed a high inconsistency of the responses to metal exposure during the first phases of the life-cycle. It is concluded that total plant mass and seed mass are the only realistic endpoints of life-cycle bioassays in risk assessment as long as ranks are inconsistent between two successive early phases of the life-cycle. 相似文献
107.
Nematodes belonging to the family Oncholaimidae are known to aggregate at sites of organic pollution. The oncholaimidAdoncholaimus thalassophygas (De Man, 1876), collected from the Weser Estuary, FRG, in 1989, has the capability to take up acetate at naturally occurring concentrations. Under almost axenic conditions, ca 2.3 to 3.0 ng sodium acetate was taken-up per worm within 24 h, when an ambient concentration of 0.33 mmol was offered. The concentration factor was ca 8.5 to 11.1. The results suggest that a highly motile oxybiotic nematode may benefit from the fermentation products of anoxic habitats.Contribution No. 251 of the Alfred-Wegener-Institute for Polar and Marine Research 相似文献
108.
Otto Lüderitz Chris Galanos Volker Lehmann Hubert Mayer Ernst Th. Rietschel Jürgen Weckesser 《Die Naturwissenschaften》1978,65(11):578-585
The endotoxic principle of lipopolysaccharides (LPS) is localized in their lipid A component. Biological effects of LPS on, for instance, body temperature, blood pressure, and blood picture, are also induced by free lipid A. In contrast to the great variability of the 0-specific chains, the chemical structure of lipid A is much more constant. It is common for Salmonella and similar for other genera of the Enterobacteriaceae. Recently, a number of lipid A's have been recognized that exhibited distinct structural features compared with Enterobacteriaceae. These lipid A's were found to be also distinct with regard to some of their biological properties. 相似文献
109.
110.