全文获取类型
收费全文 | 664篇 |
免费 | 12篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 24篇 |
废物处理 | 48篇 |
环保管理 | 31篇 |
综合类 | 125篇 |
基础理论 | 149篇 |
环境理论 | 1篇 |
污染及防治 | 187篇 |
评价与监测 | 82篇 |
社会与环境 | 25篇 |
灾害及防治 | 7篇 |
出版年
2023年 | 11篇 |
2022年 | 24篇 |
2021年 | 19篇 |
2020年 | 10篇 |
2019年 | 11篇 |
2018年 | 33篇 |
2017年 | 27篇 |
2016年 | 41篇 |
2015年 | 22篇 |
2014年 | 44篇 |
2013年 | 75篇 |
2012年 | 42篇 |
2011年 | 45篇 |
2010年 | 37篇 |
2009年 | 23篇 |
2008年 | 16篇 |
2007年 | 19篇 |
2006年 | 20篇 |
2005年 | 10篇 |
2004年 | 15篇 |
2003年 | 12篇 |
2002年 | 23篇 |
2001年 | 8篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1997年 | 4篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 5篇 |
1986年 | 2篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1970年 | 6篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 4篇 |
1966年 | 3篇 |
1965年 | 2篇 |
1964年 | 1篇 |
1961年 | 1篇 |
1960年 | 4篇 |
1959年 | 4篇 |
1958年 | 10篇 |
1957年 | 4篇 |
1956年 | 3篇 |
1955年 | 1篇 |
1931年 | 1篇 |
1930年 | 2篇 |
排序方式: 共有679条查询结果,搜索用时 468 毫秒
471.
472.
Jana Mrázová Martina Gažarová Jana Kopčeková Anna Kolesárová Ondřej Bučko Branislav Bobček 《Journal of environmental science and health. Part. B》2020,55(1):69-74
AbstractThe aim of the research was to evaluate the effect of consumption of selenium-enriched pork on selected health indicators of probands. The intake of feed mixture with increased organic selenium at the dose of 0.3?mg.kg?1 probably increases selenium concentration in MSM (musculus semimembranosus). In the pork enriched with organic selenium, the concentration was higher by 1.045?±?0.10?mg.kg?1 compared with the control group 0.701?±?0.05?mg.kg?1 at significance P?<?0.001. Sixteen participants in the experiment were represented by 8 men at the average age of 41.5?±?11.9?years and 8 women at the average age of 41.4?±?7.9?years. All the probands consumed meat enriched with selenium three times a week during one month. By consumption of the enriched pork, there was an increase of the selenium concentration in blood serum of probands traced with selenium increase from 73.19?±?15.68?μg.L?1 to 73.73?±?15.13?μg.L?1 (P?>?0.05). From the results we can see that consumption of enriched pork with selenium was significantly manifested in lowering of total cholesterol levels, which was associated with LDL cholesterol lowering (P?<?0.05). Differences among the HDL cholesterol and triglycerides samples were not significant. 相似文献
473.
474.
475.
476.
Theoretical signaling models predict that to be honest, begging vocalizations must be costly. To test this hypothesis, oxygen consumption was measured during resting and begging (i.e., vocalizing) activities in pups of the subterranean rodent Ctenomys talarum by means of open-flow respirometry. No statistical differences in individual oxygen consumption between resting and calling pups ranging in age from day 2 to day 20 were found. Given these data, begging calls of C. talarum could not be considered as honest advertisements of offspring need, contrary to what suggested by the behavioral observations of the mother and pups during the nestling period. 相似文献
477.
478.
479.
480.
V. Kupčík 《Die Naturwissenschaften》1967,54(5):114-114