全文获取类型
收费全文 | 363篇 |
免费 | 8篇 |
国内免费 | 1篇 |
专业分类
化学 | 241篇 |
晶体学 | 24篇 |
力学 | 6篇 |
数学 | 43篇 |
物理学 | 58篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 7篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 8篇 |
2015年 | 9篇 |
2014年 | 7篇 |
2013年 | 23篇 |
2012年 | 15篇 |
2011年 | 17篇 |
2010年 | 9篇 |
2009年 | 12篇 |
2008年 | 13篇 |
2007年 | 14篇 |
2006年 | 10篇 |
2005年 | 5篇 |
2004年 | 10篇 |
2003年 | 6篇 |
2002年 | 11篇 |
2001年 | 15篇 |
2000年 | 42篇 |
1999年 | 54篇 |
1998年 | 10篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 8篇 |
1993年 | 3篇 |
1992年 | 7篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1963年 | 1篇 |
1937年 | 1篇 |
排序方式: 共有372条查询结果,搜索用时 0 毫秒
111.
S. Shanmuga Sundara Raj Hoong‐Kun Fun Xuan‐Jun Zhang Yu‐Peng Tian Fu‐Xin Xie Ji‐Long Ma 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1238-1239
In the crystal structure of the title compound, C11H16N4OS, the phenyl ring and the thiosemicarbazone moiety from a dihedral angle of 7.7 (1)°. The crystal structure is governed by N—H?O and O—H?S hydrogen bonds leading to the formation of a two‐dimensional network. 相似文献
112.
Qingli Hao Fangfang Jian Xujie Yang Xin Wang Ibrahim Abdul Razak S. Shanmuga Sundara Raj Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):1431-1432
In the title complex, [Ni(Im)6](iPr‐dtp)2 or [Ni(C3H4N2)6](C6H14O2PS2)2, the coordination around the Ni atom, located on an inversion centre, is octhahedral with all positions being occupied by tertiary N atoms of the imidazole moieties. Hydrogen bonds link the anions and cations into a two‐dimensional network in the bc plane. 相似文献
113.
Fangfang Jian Fengli Bei Lude Lu Xujie Yang Xin Wang Ibrahim Abdul Razak S. Shanmuga Sundara Raj Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(7):e288-e289
In the title compound, [Cu(C5H10NO2S2)(C18H15P)2]·C18H15P, the Cu atom is in a distorted tetrahedral coordination, with two triphenylphosphine P atoms and two S atoms from an N,N‐bis(2‐hydroxyethyl)dithiocarbamate ligand occupying the vertices. The crystal structure is characterized by alternate layers of complex and triphenylphosphine molecules. 相似文献
114.
Zhong‐Lin Lu Wen Xiao Zhong‐Ning Chen Xiao‐Yang Gong S. Shanmuga Sundara Raj Ibrahim Abdul Razak Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):1017-1018
The title compound, C18H12N4O·H2O, adopts the keto tautomeric form and the azomethine C=N double bond is in the E configuration. The dihedral angle between the planes of the diazafluorene moiety and the phenyl ring is 11.3 (1)°. In the solid state, the molecules form infinite chain‐like structures via O—H?N hydrogen bonds involving the water molecules and diazafluorene moieties. 相似文献
115.
S. Kannan S. Shanmuga Sundara Raj Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):e545-e546
In the title complex, [UO2(dbm)2(PhSOPh)] or [UO2(C15H11O2)(C12H10OS)], where dbm is 1,3‐diphenylpropane‐1,3‐dionate, the U atom is surrounded by seven O atoms to give a distorted pentagonal bipyramidal geometry. The U—Ouranyl and U—Odbm distances (dbm is 1,3‐diphenylpropane‐1,3‐dionate) are in the ranges 1.760 (6)–1.776 (5) and 2.308 (4)–2.417 (4) Å, respectively, while the U—Osulfoxide distance is 2.427 (4) Å. 相似文献
116.
117.
S. Sundar Pethaiah G. Paruthimal Kalaignan G. Sasikumar M. Ulaganathan V. Swaminathan 《Journal of Solid State Electrochemistry》2013,17(11):2917-2925
Nano-catalyzed membrane with different platinum (Pt) catalyst loadings (0.25 to 1 mg cm?2) was investigated for proton exchange membrane fuel cell applications, and the Pt loading on the Nafion membrane was prepared by non-equilibrium impregnation reduction method. The prepared catalyzed membranes were subjected to various characterisations, namely, X-ray diffraction, high-resolution scanning electron microscopy (HRSEM) with energy-dispersive X-ray, cyclic voltammetry, polarisation and electrochemical impedance spectroscopy. The polycrystalline fcc cubic structure and the particle size of Pt catalyst were estimated by X-ray diffraction analysis. The membrane with 0.4 mg cm?2 of Pt loading exhibits a favourable surface morphology which is confirmed by HRSEM image. Electrochemical investigations were clearly evident that the uniform distributions of Pt particles with fine pores on Nafion membrane facilitated the three-phase boundary which leads to a better cell performance. Electrochemical impedance spectroscopy demonstrated that the cell constructed using 0.4 mg cm?2 of platinum-loaded membrane has lower resistance than the other Pt loading. 相似文献
118.
Ramendra Sundar Dey Raj Kumar Bera C. R. Raj 《Analytical and bioanalytical chemistry》2013,405(11):3431-3448
Functional nanomaterials have emerged as promising candidates in the development of an amperometric sensing platform for the detection and quantification of bioanalytes. The remarkable characteristics of nanomaterials based on metal and metal oxide nanoparticles, carbon nanotubes, and graphene ensure enhanced performance of the sensors in terms of sensitivity, selectivity, detection limit, response time, and multiplexing capability. The electrocatalytic properties of these functional materials can be combined with the biocatalytic activity of redox enzymes to develop integrated biosensing platforms. Highly sensitive and stable miniaturized amperometric sensors have been developed by integrating the nanomaterials and biocatalyst with the transducers. This review provides an update on recent progress in the development of amperometric sensors/biosensors using functional nanomaterials for the sensing of clinically important metabolites such as glucose, cholesterol, lactate, and glutamate, immunosensing of cancer biomarkers, and genosensing. 相似文献
119.
Nonenzymatic Rubylation and Ubiquitination of Proteins for Structural and Functional Studies 下载免费PDF全文
Dr. Rajesh K. Singh Adithya Sundar Prof. David Fushman 《Angewandte Chemie (International ed. in English)》2014,53(24):6120-6125
Uncovering the mechanisms that allow conjugates of ubiquitin (Ub) and/or Ub‐like (UBL) proteins such as Rub1 to serve as distinct molecular signals requires the ability to make them with native connectivity and defined length and linkage composition. A novel, effective, and affordable strategy for controlled chemical assembly of fully natural UBL–Ub, Ub–UBL, and UBL–UBL conjugates from recombinant monomers is presented. Rubylation of Ub and Rub1 and ubiquitination of Rub1 was achieved without E2/E3 enzymes. New residue‐specific information was obtained on the interdomain contacts in naturally‐occurring K48‐linked Rub1–Ub and Ub–Rub1, and K29‐linked Rub1–Ub heterodimers, and their recognition by a K48‐linkage‐specific Ub receptor. The disassembly of these heterodimers by major deubiquitinating enzymes was examined and it was discovered that some deubiquitinases also possess derubylase activity. This unexpected result suggests possible crosstalk between Ub and Rub1/Nedd8 signaling pathways. 相似文献
120.
R. Krishna D. Velmurugan S. Shanmuga Sundara Raj H.‐K. Fun P. C. Srinivasan 《Crystal Research and Technology》2001,36(11):1295-1301
The title compound crystallizes in monoclinic system with space group P21 /n. The cell parameters are a = 12.3824(3) Å, b = 8.9255(1) Å, c = 19.9188(4) Å, V = 2181.75(7) Å3 , α = γ = 90.0° and β = 97.663(1)°. The structure has an indole moiety and an imidazolidine ring connected together. The phenyl sulfonyl group is attached to the indole moiety and the dichlorophenyl ring to the imidazolidine ring. The structure has a C‐H … Cl intra molecular hydrogen bond and C‐H … π type intermolecular interactions. 相似文献