首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   80篇
  免费   2篇
  国内免费   1篇
化学   58篇
数学   11篇
物理学   14篇
  2023年   2篇
  2021年   2篇
  2020年   1篇
  2019年   4篇
  2016年   2篇
  2015年   3篇
  2014年   1篇
  2013年   4篇
  2012年   4篇
  2011年   8篇
  2010年   4篇
  2009年   2篇
  2008年   4篇
  2007年   4篇
  2006年   5篇
  2005年   2篇
  2004年   3篇
  2003年   1篇
  2002年   1篇
  2001年   1篇
  2000年   2篇
  1999年   2篇
  1998年   2篇
  1997年   1篇
  1996年   4篇
  1995年   1篇
  1992年   2篇
  1991年   2篇
  1990年   1篇
  1989年   2篇
  1987年   1篇
  1984年   1篇
  1983年   1篇
  1980年   1篇
  1978年   1篇
  1963年   1篇
排序方式: 共有83条查询结果,搜索用时 15 毫秒
51.
52.
NMR detection of intermolecular interactions between protons in large protein complexes is very challenging because it is difficult to distinguish between weak NOEs from intermolecular interactions and the much larger number of strong intramolecular NOEs. This challenging task is exacerbated by the decrease in signal-to-noise ratio in the often used isotope-edited and isotope-filtered experiments as a result of enhanced T(2) relaxation. Here, we calculate a double difference spectrum that shows exclusively intermolecular NOEs and manifests the good signal-to-noise ratio in 2D homonuclear NOESY spectra even for large proteins. The method is straightforward and results in a complete picture of all intermolecular interactions involving non exchangeable protons. Ninety-seven such (1)H-(1)H NOEs were assigned for the 44 KDa interferon-α2/IFNAR2 complex and used for docking these two proteins. The symmetry of the difference spectrum, its superb resolution, and unprecedented signal-to-noise ratio in this large protein/receptor complex suggest that this method is generally applicable to study large biopolymeric complexes.  相似文献   
53.
54.
This paper contains the proofs and some development of results that were published without proofs in [KN2]. It is completed with comments added by the second author explaining how these results became the basis of statements and the solutions of problems in the theory of entire functions, in the moment problem, in direct and inverse problems of the spectral theory of nonhomogeneous strings and in other problems.  相似文献   
55.
Two new unsymmetrically substituted photochromic diarylethenes, namely 3‐[3, 3,4,4,5,5‐hexafluoro‐2‐(2‐methylbenzothien‐3‐yl)cyclopent‐1‐en‐1‐yl]‐2‐methyl‐6‐methoxy‐1‐ benzothiophene and 3‐[3,3,4,4,5,5‐hexafluoro‐2‐(2‐methylbenzothien‐3‐yl)cyclopent‐1‐en‐1‐yl]‐2‐methyl‐6‐methoxy‐7‐nitro‐1‐benzothiophene, were synthesized. Their optical properties and kinetics of cyclization and cycloreversion were determined in four solvents and compared with the symmetrical diarylethene (3,3,4,4,5,5‐hexafluorocyclopent‐1‐en‐1,2‐diyl)bis(2‐methyl‐1‐benzothiophene). While the UV spectra of the three compounds are almost insensitive to solvent changes, the rates of the ring‐opening and ring‐closure reactions exhibit interesting kinetic behavior that differs from other diarylethenes reported in the literature. The cycloreversion for the three compounds follows first‐order kinetics, whereas the cyclization cannot be described by a simple kinetic law. Different approaches were tested, and a complex exponential equation could be derived that fits the experimental data. The unusual presence of two ring‐opened conformational isomers, one of them nonphotochromic, is proposed for the ring‐opened compounds to explain the derived kinetic law and observed solvent effects. These results are of interest in relation to the application of the novel diarylethenes as potential optical materials. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 44: 736–744, 2012  相似文献   
56.
57.
58.
Hydrogen chloride qualitatively generated in situ by the addition of acetyl chloride to alcoholic solutions is a useful reagent for carboxylic acid esterification, N-t-Boc deprotection and phosphoramide solvolysis reactions.  相似文献   
59.
This paper calculates the Hochschild homology of fatpoints—rings of the formk[x 1,x 2,…,x d ]/m a wherek is a field of characteristic zero and m=(x 1 x 2,…,x d ). The calculation includes the multiplicative structure induced by the shuffle product. The answer is given in terms of the homology of tori relative to theira-diagonal. Since the rings in question are monoidal, this calculation also determines their topological Hochschild homology. By a theorem of Goodwillie, the dimensions of the cyclic homology groups of these rings are determined as well.  相似文献   
60.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号