全文获取类型
收费全文 | 507篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
化学 | 425篇 |
晶体学 | 1篇 |
力学 | 8篇 |
数学 | 9篇 |
物理学 | 66篇 |
出版年
2022年 | 4篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 2篇 |
2016年 | 1篇 |
2015年 | 5篇 |
2014年 | 9篇 |
2013年 | 36篇 |
2012年 | 20篇 |
2011年 | 18篇 |
2010年 | 16篇 |
2009年 | 12篇 |
2008年 | 23篇 |
2007年 | 31篇 |
2006年 | 24篇 |
2005年 | 29篇 |
2004年 | 17篇 |
2003年 | 27篇 |
2002年 | 17篇 |
2001年 | 11篇 |
2000年 | 6篇 |
1999年 | 12篇 |
1998年 | 9篇 |
1997年 | 6篇 |
1996年 | 6篇 |
1995年 | 9篇 |
1994年 | 16篇 |
1993年 | 5篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 9篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 11篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 10篇 |
1975年 | 7篇 |
1974年 | 6篇 |
1973年 | 3篇 |
1972年 | 7篇 |
1971年 | 2篇 |
排序方式: 共有509条查询结果,搜索用时 15 毫秒
71.
Kawamoto S Takasu M Miyakawa T Morikawa R Oda T Futaki S Nagao H 《The Journal of chemical physics》2011,134(9):095103
Arginine-rich peptide and Antennapedia are cell-penetrating peptides (CPPs) which have the ability to permeate plasma membrane. Deformation of the plasma membrane with CPPs is the key to understand permeation mechanism. We investigate the dynamics of CPP and the lipid bilayer membrane by coarse-grained simulation. We found that the peptide makes inverted micelle in the lipid bilayer membrane, when the attractive potential between the peptide and lipid heads is strong. The inverted micelle is formed to minimize potential energy of the peptide. For vesicle membrane, the peptide moves from the outer vesicle to the inner vesicle through the membrane. The translocation of the peptide suggests inverted micelle model as a possible mechanism of CPPs. 相似文献
72.
In this note we give a simpler proof of Kato's inequality for the Weyl quantized relativistic HamiltonianH
A
m
of a spinless particle with a more singular vector potentialA(x) than in a previous paper of one of the authors.
This article was processed by the author using the Springer-Verlag TEX mamath macro package 1990 相似文献
73.
74.
The chlorination processes of four hydrated aluminas (bayerite, gibbsite, pseudoboehmite, boehmite) and four transition aluminas (η-,γ-,δ-,θ-Al2O3) were studied in the presence of active carbon by means of a gas-flow DTA apparatus. In the case of hydrated alumina systems three exothermic peaks appeared at about 230, 460 and 500°C or above, which corresponded to the formation of hydrogen chloride, white needle-like crystals and the chlorination of hydrated aluminas, respectively. On the other hand, in transition alumina systems, only one exothermic peak due to the chlorination of transition alumina appeared at 580–670°C. The relationship between the chlorination behavior and structure of transition aluminas was discussed. 相似文献
75.
The (N-benzyl-l-leucinato) copper(II) complex was shown pH titration to coordinate l-amino acids more strongly than d enantiomers. A chiral polymer complex, containing N-alkylated amino acid residue and copper(II) ion, was used partially to resolve some optically active amino acids. Unlike the (N-benzyl-l-amino acidate)-copper(II) complex, the polymer—copper(II) complex coordinates d-amino acids more strongly than l-enantiomers; the effect was explained by formation of (N,N-dialkylated-amino acidate) copper(II) complex in the polymer. 相似文献
76.
Eishun Tsuchida Shinichi Irie 《Journal of polymer science. Part A, Polymer chemistry》1973,11(4):789-799
In order to discuss the electrostatic-field effect on a polymer reaction, the quaternization of poly-4-vinylpyridine–benzyl chloride (system I) was compared to that of poly-γ-chloromethylstyrene–γ-picoline (system II). In these two systems, the reaction initially proceeded according to the simple second-order kinetics. However, after the degree of quaternization exceeded 20–30 mole-%, a deviation from simple second-order kinetics occurred. In system I negative deviation occurred, while in system II positive deviation occurred. These phenomena occurred even though the solvent or the initial concentrations of the reactants were changed. The reasons for these phenomena are given below. In system I, the quaternized pyridine nitrogens prevented the benzyl chloride from approaching the unquaternized pyridine nitrogens. However, in system II the free γ-picoline was attracted by the quaternized chloro-γ-methyl site. Furthermore, the point at which the deviation occurred was determined by the degree of chloromethylation. All these results suggest that the effect of an electrostatic field must be presumed in these two systems. 相似文献
77.
78.
79.
80.