全文获取类型
收费全文 | 1563篇 |
免费 | 58篇 |
国内免费 | 3篇 |
专业分类
化学 | 1218篇 |
晶体学 | 27篇 |
力学 | 43篇 |
数学 | 78篇 |
物理学 | 258篇 |
出版年
2023年 | 9篇 |
2022年 | 6篇 |
2021年 | 12篇 |
2020年 | 21篇 |
2019年 | 28篇 |
2018年 | 15篇 |
2017年 | 13篇 |
2016年 | 29篇 |
2015年 | 35篇 |
2014年 | 34篇 |
2013年 | 84篇 |
2012年 | 80篇 |
2011年 | 84篇 |
2010年 | 55篇 |
2009年 | 49篇 |
2008年 | 84篇 |
2007年 | 94篇 |
2006年 | 98篇 |
2005年 | 79篇 |
2004年 | 76篇 |
2003年 | 74篇 |
2002年 | 61篇 |
2001年 | 26篇 |
2000年 | 39篇 |
1999年 | 18篇 |
1998年 | 19篇 |
1997年 | 18篇 |
1996年 | 13篇 |
1995年 | 15篇 |
1994年 | 18篇 |
1993年 | 19篇 |
1992年 | 16篇 |
1991年 | 13篇 |
1990年 | 17篇 |
1989年 | 18篇 |
1988年 | 17篇 |
1987年 | 12篇 |
1986年 | 16篇 |
1985年 | 27篇 |
1984年 | 19篇 |
1982年 | 15篇 |
1981年 | 18篇 |
1980年 | 12篇 |
1979年 | 12篇 |
1978年 | 18篇 |
1977年 | 19篇 |
1976年 | 14篇 |
1975年 | 9篇 |
1974年 | 13篇 |
1972年 | 5篇 |
排序方式: 共有1624条查询结果,搜索用时 15 毫秒
131.
132.
133.
Front Cover: Construction of a Triangle‐Shaped Trimer and a Tetrahedron Using an α‐Helix‐Inserted Circular Permutant of Cytochrome c555 (Chem. Asian J. 10/2018)
下载免费PDF全文
![点击此处可从《化学:亚洲杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
134.
Umakoshi K Yamasaki T Fukuoka A Kawano H Ichikawa M Onishi M 《Inorganic chemistry》2002,41(16):4093-4095
Treatment of pyridine-2-thiol (pytH) with H(2) (60 atm) in the presence of 5-methylpyridine-2-thiolate (5-mpyt)-bridged dinuclear Pt(III), Pt(II), or Pd(II) complexes (1 mol %) in DMF at 150 degrees C for 72 h leads to the formation of pyridine in 3-51% yield. From the (1)H NMR study of the exchange reactions and of the products under D(2) pressure, it is suggested that the catalytic reaction involves bimetallic activation of the pyt ligand followed by the liberation of pyridine and H(2)S. 相似文献
135.
Spectroscopic and crystallographic studies on the stability of self-assembled coordination nanotubes
Aoyagi M Tashiro S Tominaga M Biradha K Fujita M 《Chemical communications (Cambridge, England)》2002,(18):2036-2037
On complexation with (en)Pd(NO3)2, tetrakis(3,5-pyridine) ligand gives two isomeric coordination nanotubes, which are in slow equilibrium despite the presence of sixteen Pd-N bonds in the tube framework. 相似文献
136.
Ito S Sugiyama H Yoshifuji M 《Angewandte Chemie (International ed. in English)》2000,39(15):2781-2783
137.
The reaction of 2,3-dichloro-5,6-dicyanopyrazine ( 1 ) with enamines as well as a few tertiary amines as enamine precursors was investigated. Both reactions gave aminovinyl-substituted pyrazine derivatives. During the attempted purification of 3c or 3d by column chromatography on silica gel, 2-chloro-5,6-dicyano-3-(1′-oxocyclopent-2′-yl)pyrazine ( 4 ) was obtained, apparently by hydrolytic cleavage. The products prepared are all of interest as potential pesticides. 相似文献
138.
Minoru Kumakura Masaru Yoshida Isao Kaetsu 《Applied biochemistry and biotechnology》1978,3(3):175-183
The immobilization ofStreptomyces phaeochromogenes cells was studied by the radiation-induced polymerization of various hydrophobic glass-forming monomers at low temperatures. The glucose isomerase activity of cells immobilized in hydrophobic polymers showed no decrease in activity with repeated use (batch enzyme reaction). Activity increased with increasing monomer concentration in contrast to results with the immobilized enzyme. The hydrophobic polymer composite was microspheric in form. The particle diameter of the composite increased with the increasing monomer concentration.K m values of the immobilized cells were close to that of intact cells. It was deduced that the cells were trapped on the surface part of the hydrophobic polymer ready to react with the substrate, and not within the matrix where diffusion would play an important role in reaction rates. 相似文献
139.
K. Sugiyama 《Colloid and polymer science》1978,256(2):204
Ohne Zusammenfassung 相似文献
140.
The C-S stretching vibrations of 28 aliphatic sulfides including one thiol are summarized, and all of the C-S stretching bands are classified into several groups. An extraordinarily low frequency associated with the ethyl group is discussed briefly. 相似文献