全文获取类型
收费全文 | 227篇 |
免费 | 13篇 |
专业分类
化学 | 202篇 |
晶体学 | 1篇 |
数学 | 10篇 |
物理学 | 27篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 6篇 |
2015年 | 7篇 |
2014年 | 10篇 |
2013年 | 13篇 |
2012年 | 12篇 |
2011年 | 16篇 |
2010年 | 8篇 |
2009年 | 9篇 |
2008年 | 12篇 |
2007年 | 12篇 |
2006年 | 13篇 |
2005年 | 18篇 |
2004年 | 17篇 |
2003年 | 15篇 |
2002年 | 17篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1976年 | 3篇 |
1965年 | 1篇 |
1937年 | 2篇 |
1934年 | 1篇 |
排序方式: 共有240条查询结果,搜索用时 12 毫秒
71.
72.
73.
Ning‐Hai Hu Yasuhiro Kiyota Katsuyuki Aoki 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1284-1286
In the title compound, 3‐[(3,4‐dihydro‐2‐methyl‐4‐oxopyrimidin‐5‐yl)methyl]‐5‐(2‐hydroxyethyl)‐4‐methylthiazolium hexafluorophosphate monohydrate, C12H16N3O2S+·PF6?·H2O, oxythiamine is a monovalent cation with a neutral oxopyrimidine ring. The molecule assumes the F conformation, which is a common form for thiamine but which is substantially different from the unusual V conformation found in the chloride and hydrochloride salts of oxythiamine. The anion‐bridging interaction, C—H?anion?pyrimidine, is emphasized as being important for stabilization of the F conformation. 相似文献
74.
75.
76.
77.
Masato Takeuchi Hiromasa Yamagawa Masaya Matsuoka Masakazu Anpo 《Research on Chemical Intermediates》2014,40(1):23-31
A hybrid photocatalyst was prepared from visible light-responsive Pt/WO3 and siliceous mordenite (MOR) zeolite by simple impregnation with an aqueous solution of (NH4)10W12O41·5H2O. Unmodified Pt/WO3 had low photocatalytic activity in gas phase oxidation of acetaldehyde because of its low surface area (3–5 m2/g). In contrast, the Pt/WO3–MOR had higher photocatalytic activity under focused sunlight and Xe lamp irradiation. Pt/WO3–MOR with low WO3 content (<20 wt%) adsorbed sufficient acetaldehyde, but absorption of light in the visible region was low. The optimum zeolite content enhancing the photocatalytic activity of Pt/WO3 was estimated to be 30–50 % (w/w). Adsorption of the gaseous reactants and the efficiency of absorption of incident light are both important aspects of high photocatalytic activity. 相似文献
78.
Yagi H Banerjee D Graham B Huber T Goldfarb D Otting G 《Journal of the American Chemical Society》2011,133(27):10418-10421
Double electron-electron resonance (DEER) distance measurements of a protein complex tagged with two Gd(3+) chelates developed for rigid positioning of the metal ion are shown to deliver outstandingly accurate distance measurements in the 6 nm range. The accuracy was assessed by comparison with modeled distance distributions based on the three-dimensional molecular structures of the protein and the tag and further comparison with paramagnetic NMR data. The close agreement between the predicted and experimentally measured distances opens new possibilities for investigating the structure of biomolecular assemblies. As an example, we show that the dimer interface of rat ERp29 in solution is the same as that determined previously for human ERp29 in the single crystal. 相似文献
79.
80.