全文获取类型
收费全文 | 3742篇 |
免费 | 4篇 |
国内免费 | 35篇 |
专业分类
安全科学 | 65篇 |
废物处理 | 159篇 |
环保管理 | 348篇 |
综合类 | 874篇 |
基础理论 | 1234篇 |
环境理论 | 2篇 |
污染及防治 | 706篇 |
评价与监测 | 200篇 |
社会与环境 | 192篇 |
灾害及防治 | 1篇 |
出版年
2021年 | 14篇 |
2018年 | 116篇 |
2017年 | 138篇 |
2016年 | 184篇 |
2015年 | 54篇 |
2014年 | 23篇 |
2013年 | 53篇 |
2012年 | 443篇 |
2011年 | 232篇 |
2010年 | 40篇 |
2009年 | 48篇 |
2008年 | 78篇 |
2007年 | 87篇 |
2006年 | 86篇 |
2005年 | 411篇 |
2004年 | 544篇 |
2003年 | 407篇 |
2002年 | 58篇 |
2001年 | 53篇 |
2000年 | 24篇 |
1999年 | 43篇 |
1998年 | 11篇 |
1997年 | 16篇 |
1995年 | 17篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 12篇 |
1991年 | 17篇 |
1990年 | 15篇 |
1989年 | 11篇 |
1981年 | 10篇 |
1966年 | 10篇 |
1965年 | 9篇 |
1963年 | 16篇 |
1962年 | 9篇 |
1961年 | 10篇 |
1959年 | 15篇 |
1958年 | 10篇 |
1956年 | 14篇 |
1955年 | 16篇 |
1954年 | 9篇 |
1934年 | 11篇 |
1930年 | 12篇 |
1929年 | 10篇 |
1928年 | 9篇 |
1927年 | 14篇 |
1926年 | 16篇 |
1925年 | 12篇 |
1924年 | 9篇 |
1921年 | 9篇 |
排序方式: 共有3781条查询结果,搜索用时 78 毫秒
31.
Linda?Anderson-BerryEmail author David?King 《Mitigation and Adaptation Strategies for Global Change》2005,10(3):367-392
Community mitigation of hazard impact requires hazard knowledge and preparedness on the part of the members of diverse and
complex communities. Longitudinal research in the tropical cyclone prone north of Australia has gathered extensive datasets
on community awareness, preparedness and knowledge, in order to contribute to education campaigns and mitigation strategies.
Data have been used to identify issues of vulnerability to cyclones and capacity to deal with the hazard. This has been developed
as a community vulnerability and capacity model that may be applied to diverse communities in order to assess levels of capability
to mitigate and deal with the cyclone hazard. The model is presented here in a simplified form as its development is evolving
and ongoing. 相似文献
32.
33.
The Henze precipitate, a peculiar blue-green microparticulate obtained by lysis of the blood cells of the ascidian Phallusia mammillata (Protochordata), was investigated with atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray microanalysis. The precipitate was collected from the Henze solution, an unstable red-brown product obtained by treating blood with distilled water, whose degradation yields a characteristic blue-green product. The microparticulates measured 50–100 µm in diameter and appeared irregular in shape. SEM examination showed smooth, roughly round boundaries. The microparticulate surface examined with AFM appeared as an irregular matrix formed by 70–320-nm-wide mammillate composites, including and embedding small (500–800 nm wide) crystal-like multilayered formations. X- ray analysis showed that the elements present in these same precipitates were mainly C, Si, Al and O. The microparticulate composition appeared close to those of natural waxes or lacquers, embedding amorphous silicates and/or other Si–Al components. The unusual occurrence of Si in ascidian blood and its role are discussed. 相似文献
34.
35.
Otto Kandler 《Die Naturwissenschaften》1981,68(4):183-192
The determination of the sequence similarity of the ribosomal 16S RNA of many bacteria and a few higher organisms has shown that the methanogenic, halophilic, and acido-thermophilic organisms are phylogenetically separated from the kingdoms of the Eubacteria and Eukaryotes thus representing a third kingdom called "Archaebacteria". Many biochemical and molecular biological features support this conclusion. 相似文献
36.
37.
38.
Theodor Schmidt 《Die Naturwissenschaften》1955,42(20):555-555
39.
40.
In Acromyrmex octospinosus leaf-cutting ants the metapleural glands produce an array of antibiotic compounds that serve as a general defence against unwanted microbes on the cuticle. Leaf-cutting ants also grow mutualistic Pseudonocardiaceae bacteria on their cuticle that produce antibiotics controlling a microfungal parasite of their fungus gardens. Interaction between this bacterium and gland secretion therefore seems unavoidable. We document the typical development of bacterial growth on the cuticle of young major workers, show that growth starts a few days after eclosion, and that the maximal cover is reached after 2–3 weeks and gradually declines when workers mature. Experimental closure of the metapleural glands had no effect on the initial exponential growth phase of the bacterium, but significantly reduced the cover during the decline phase. The age-dependent abundance of the bacterium and its partial dependence on metapleural gland secretion support the hypothesis that the abundance of this mutualist is actively regulated. 相似文献