全文获取类型
收费全文 | 603篇 |
免费 | 3篇 |
国内免费 | 4篇 |
专业分类
化学 | 549篇 |
晶体学 | 1篇 |
力学 | 4篇 |
数学 | 8篇 |
物理学 | 48篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 8篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 23篇 |
2015年 | 24篇 |
2014年 | 43篇 |
2013年 | 30篇 |
2012年 | 33篇 |
2011年 | 66篇 |
2010年 | 53篇 |
2009年 | 45篇 |
2008年 | 42篇 |
2007年 | 45篇 |
2006年 | 42篇 |
2005年 | 52篇 |
2004年 | 40篇 |
2003年 | 37篇 |
2002年 | 2篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1993年 | 1篇 |
排序方式: 共有610条查询结果,搜索用时 0 毫秒
191.
192.
193.
194.
Fabio Bellina Author Vitae Author Vitae 《Tetrahedron》2009,65(50):10269-797
195.
196.
197.
198.
199.
In the last years a great deal of research has been focused on the determination of harmful trace metals such as Cd, Co, Cr, Cu, Ni or Pb in airborne particulate matter (APM). However, the commonly applied determination of total element concentrations in APM provides only an upper-end estimate of potential metal toxicity. For improved risk assessment it is important to determine bio-accessible concentrations instead of total metal contents. The present review gives an overview of analytical procedures reported for measurement of bio-accessible trace metal fractions in APM. The different approaches developed for extraction of soluble trace metals in APM are summarized. Furthermore the analytical techniques applied for accurate determination of dissolved trace metals in the presence of complex sample matrix are presented. Finally a compilation of published results for bio-accessible trace metals in APM is included. 相似文献
200.
Nenad Filipovi?Author VitaeTamara Todorovi?Author Vitae Dušanka Radanovi?Author VitaeVladimir Divjakovi?Author Vitae Rade Markovi?Author VitaeIvana Paji?Author Vitae Katarina An?elkovi?Author Vitae 《Polyhedron》2012,31(1):19-28
Two novel cadmium(II) complexes with condensation derivatives of 2-acetylpyridine or 2,6-diacetylpyridine with ethyl hydrazinoacetate hydrochloride were synthesized. X-ray crystal structures of the complexes revealed a bidentate coordination of the 2-acetylpyridine derivative, while the symmetric 2,6-diacetylpyridine derivative was coordinated tridentately. It was found that the oxygen atoms were not coordinated to the cadmium ions, despite the fact that they are the position to form six membered chelate rings. NMR spectroscopy investigations showed that the coordination properties of the ligands do not change in solution. Both complexes possess cytotoxic potential, as determined by the toxicity test to Artemia salina. 相似文献