全文获取类型
收费全文 | 143篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 3篇 |
环保管理 | 10篇 |
综合类 | 43篇 |
基础理论 | 39篇 |
污染及防治 | 37篇 |
评价与监测 | 6篇 |
社会与环境 | 2篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 5篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 7篇 |
2013年 | 10篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 13篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 13篇 |
2006年 | 3篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 5篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 5篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1985年 | 1篇 |
1963年 | 2篇 |
1962年 | 1篇 |
1958年 | 1篇 |
1956年 | 3篇 |
1955年 | 2篇 |
1950年 | 1篇 |
1942年 | 1篇 |
1941年 | 1篇 |
1938年 | 1篇 |
1937年 | 1篇 |
1934年 | 3篇 |
1933年 | 1篇 |
1928年 | 1篇 |
1926年 | 1篇 |
排序方式: 共有144条查询结果,搜索用时 15 毫秒
141.
Anton Roth 《Die Naturwissenschaften》2010,97(7):645-653
In fish the neuromasts of the lateral line develop as follows: a “migrating primordium” (MP) migrates from the postotic placode
along the future posterior lateral line canal to the tail fin. Its placodal cells are assumed to be the basis for the development
of the neuromasts. However, an MP was not found in all fish, e.g., in catfish. In the present study, a search was made for
the MP in the larvae of the catfish Silurus glanis. Using light and electron microscopy, an MP was found to migrate along the ventral rim of the tail. It precedes the formation
of a ventral row of free neuromasts. An MP preceding the main lateral row of the future canal neuromasts was not found. The
necessity of the MP for the ventral-free neuromast development is shown by making incisions which block its migration. The
result: caudal to the incision site neuromasts do not develop. On the other hand, the same incision procedure applied to the
assumed migration route of a—hypothetical—lateral MP does not block the development of the lateral neuromasts. It is concluded
that in this case an MP is not necessary for the development of the canal neuromasts. 相似文献
142.
Vrsic S Ivancic A Pulko B Valdhuber J 《Journal of environmental biology / Academy of Environmental Biology, India》2011,32(3):289-294
Green cover in vineyards on steep slopes may play an important role in the reduction of soil erosion. The main objective of this study was to investigate the effect of a permanent green cover (PGC) on soil erosion, together with any loss of nutrients, and to compare it with periodic soil tillage (PST). PST took place in the spring (May) and summer (August), in each second area between rows, in a vineyard with permanent green cover. In the case of PST experimental treatments, on average, 1892 kg of soil ha-1 yr-1 eroded, together with the nutrients. In the case of PGC treatments, the amountof soil erosion was only 92 kg ha-1 yr-1. The greater portion of erosive events occurred after tillage in summer, which was accompanied by heavy rainfall and slow renewal of grass cover (slower than in spring). PGC treatment provided a better environment for the activities of soil macro-organisms (i.e., earthworms belonging to the family Lumbricidae), and mostof the organisms were close to the soil surface. In PST treatment, the majority of macro-organisms were below the area disturbed by the tillage (between 10 and 20 cm). The results of our investigation indicate that, in order to adjust wine production activities to climatic changes in vineyards with permanent green cover, PST in area between rows is more advisable in spring (end of May) than in summer (first decade of August) owing to an earlier establishment of effective grass cover. 相似文献
143.
Boivin ME Massieux B Breure AM Greve GD Rutgers M Admiraal W 《Environmental pollution (Barking, Essex : 1987)》2006,140(2):239-246
Potential of bacterial communities in biofilms to recover after copper exposure was investigated. Biofilms grown outdoor in shallow water on glass dishes were exposed in the laboratory to 0.6, 2.1, 6.8 micromol/l copper amended surface water and a reference and subsequently to un-amended surface water. Transitions of bacterial communities were characterised with denaturing gradient gel electrophoresis (DGGE) and community-level physiological profiles (CLPP). Exposure to 6.8 micromol/l copper provoked distinct changes in DGGE profiles of bacterial consortia, which did not reverse upon copper depuration. Exposure to 2.1 and 6.8 micromol/l copper was found to induce marked changes in CLPP of bacterial communities that proved to be reversible during copper depuration. Furthermore, copper exposure induced the development of copper-tolerance, which was partially lost during depuration. It is concluded that bacterial communities exposed to copper contaminated water for a period of 26 days are capable to restore their metabolic attributes after introduction of unpolluted water in aquaria for 28 days. 相似文献
144.
Novikov Dmitry A. Khvaschevskaya Albina A. Kopylova Yulia G. Pyryaev Aleksandr N. Maksimova Anastasia A. Derkachev Anton S. Dultsev Fedor F. Chernykh Anatoliy V. Purgina Daria V. 《Environmental science and pollution research international》2022,29(55):83081-83098
Environmental Science and Pollution Research - The first integrated isotope and chemistry results have been obtained for radon-rich thermal waters from the Belokurikha field which are used at a... 相似文献