全文获取类型
收费全文 | 483篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 7篇 |
废物处理 | 15篇 |
环保管理 | 39篇 |
综合类 | 196篇 |
基础理论 | 90篇 |
环境理论 | 1篇 |
污染及防治 | 109篇 |
评价与监测 | 12篇 |
社会与环境 | 16篇 |
灾害及防治 | 1篇 |
出版年
2021年 | 7篇 |
2020年 | 7篇 |
2018年 | 5篇 |
2017年 | 15篇 |
2016年 | 7篇 |
2014年 | 10篇 |
2013年 | 19篇 |
2012年 | 18篇 |
2011年 | 22篇 |
2010年 | 11篇 |
2009年 | 16篇 |
2008年 | 28篇 |
2007年 | 19篇 |
2006年 | 16篇 |
2005年 | 16篇 |
2004年 | 14篇 |
2003年 | 4篇 |
2002年 | 11篇 |
2001年 | 9篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 6篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1993年 | 5篇 |
1990年 | 4篇 |
1981年 | 6篇 |
1980年 | 5篇 |
1977年 | 4篇 |
1973年 | 6篇 |
1972年 | 6篇 |
1971年 | 4篇 |
1970年 | 4篇 |
1967年 | 6篇 |
1965年 | 5篇 |
1963年 | 6篇 |
1961年 | 4篇 |
1960年 | 5篇 |
1959年 | 7篇 |
1957年 | 5篇 |
1956年 | 9篇 |
1955年 | 10篇 |
1938年 | 3篇 |
1937年 | 3篇 |
1934年 | 4篇 |
1932年 | 3篇 |
1930年 | 3篇 |
1927年 | 3篇 |
1924年 | 3篇 |
1913年 | 3篇 |
排序方式: 共有486条查询结果,搜索用时 15 毫秒
241.
242.
243.
244.
245.
246.
247.
248.
H. E. Schmidt 《Marine Biology》1972,15(3):279-281
Two new hydromedusae collected in 1970 in the Eilat Bay (Red Sea) are here described as Allorathkea ankeli n. gen. n. sp. and Thamnostoma eilatensis n. sp. A. ankeli (Family Rathkeidae) is characterized by 8 radial canals, dichotomously branched oral arms, and solid marginal tentacles arranged in 8 groups. T. eilatensis (Family Bougainvilliidae) possesses 4 solitary marginal tentacles, 4 interradial gonads and dichotomously branched oral tentacles inserted above mouth-rim. 相似文献
249.
Metabolism of the environmental estrogen bisphenol A by plant cell suspension cultures 总被引:2,自引:0,他引:2
The metabolism of the environmental estrogen bisphenol A (BPA) was studied in heterotrophic plant cell suspension cultures of soybean (Glycine max), wheat (Triticum aestivum), foxglove (Digitalis purpurea), and thorn apple (Datura stramonium), which were regarded as metabolic model systems for intact plants. Three main metabolic routes of BPA were observed in the tissues. Most of the radioactivity found in the cell extracts consisted of carbohydrate conjugates of BPA amounting to about 85% (foxglove), 80% (wheat), 7% (soybean) and 15% (thorn apple) of applied 14C. The second main route was formation of non-extractable residues. Portions detected were low in foxglove (3.9% of applied 14C), moderate in wheat (13.5%), high in thorn apple (27.4%) and soybean (49.4%). With thorn apple, BPA derived bound residues were preponderantly resistant towards acid treatment; only traces of BPA were released. The third route was the formation of a highly polar, presumably polymeric material detected in media of soybean and thorn apple (29.3% and 36.0% of applied 14C, respectively). The mechanism of its formation remained unknown. In thorn apple, this highly polar material was formed extremely rapidly, and was considerably stable. Only traces of BPA were liberated by hydrolytic treatment with cellulase or acid. During hydrolysis experiments with glycoside fractions, non-extractable residues and highly polar materials, low amounts of presumably primary metabolites of BPA (up to 6% of applied 14C) were detected besides the parent compound; their chemical structures remained unclear. 相似文献
250.