全文获取类型
收费全文 | 204904篇 |
免费 | 1978篇 |
国内免费 | 598篇 |
专业分类
化学 | 103067篇 |
晶体学 | 3347篇 |
力学 | 9309篇 |
综合类 | 5篇 |
数学 | 22514篇 |
物理学 | 69238篇 |
出版年
2021年 | 1662篇 |
2020年 | 1802篇 |
2019年 | 2009篇 |
2018年 | 2707篇 |
2017年 | 2604篇 |
2016年 | 3773篇 |
2015年 | 2333篇 |
2014年 | 3630篇 |
2013年 | 9125篇 |
2012年 | 7272篇 |
2011年 | 8763篇 |
2010年 | 6078篇 |
2009年 | 5932篇 |
2008年 | 7958篇 |
2007年 | 8130篇 |
2006年 | 7755篇 |
2005年 | 6932篇 |
2004年 | 6456篇 |
2003年 | 5686篇 |
2002年 | 5515篇 |
2001年 | 6448篇 |
2000年 | 4967篇 |
1999年 | 3808篇 |
1998年 | 3045篇 |
1997年 | 3056篇 |
1996年 | 2800篇 |
1995年 | 2624篇 |
1994年 | 2474篇 |
1993年 | 2345篇 |
1992年 | 2707篇 |
1991年 | 2684篇 |
1990年 | 2614篇 |
1989年 | 2424篇 |
1988年 | 2473篇 |
1987年 | 2461篇 |
1986年 | 2295篇 |
1985年 | 2996篇 |
1984年 | 3232篇 |
1983年 | 2644篇 |
1982年 | 2821篇 |
1981年 | 2798篇 |
1980年 | 2656篇 |
1979年 | 2748篇 |
1978年 | 2836篇 |
1977年 | 2840篇 |
1976年 | 2912篇 |
1975年 | 2695篇 |
1974年 | 2656篇 |
1973年 | 2785篇 |
1972年 | 1767篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
Functional Binding Surface of a β‐Hairpin VEGF Receptor Targeting Peptide Determined by NMR Spectroscopy in Living Cells 下载免费PDF全文
Dr. Donatella Diana Anna Russomanno Dr. Lucia De Rosa Dr. Rossella Di Stasi Dr. Domenica Capasso Dr. Sonia Di Gaetano Dr. Alessandra Romanelli Dr. Luigi Russo Dr. Luca D. D'Andrea Prof. Roberto Fattorusso 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(1):91-95
In this study, the functional interaction of HPLW peptide with VEGFR2 (Vascular Endothelial Growth Factor Receptor 2) was determined by using fast 15N‐edited NMR spectroscopic experiments. To this aim, 15N uniformly labelled HPLW has been added to Porcine Aortic Endothelial Cells. The acquisition of isotope‐edited NMR spectroscopic experiments, including 15N relaxation measurements, allowed a precise characterization of the in‐cell HPLW epitope recognized by VEGFR2. 相似文献
23.
24.
25.
S. D. Campos 《中国物理C(英文版)》2020,44(10):103103-103103-10
This work presents the subtraction procedure and the Regge cut in the logarithmic Regge pole approach. The subtraction mechanism leads to the same asymptotic behavior as previously obtained in the non-subtraction case. The Regge cut, in contrast, introduces a clear role to the non-leading contributions for the asymptotic behavior of the total cross-section. From these results, some simple parameterization is introduced to fit the experimental data for the proton-proton and antiproton-proton total cross-section above some minimum value up to the cosmic-ray. The fit parameters obtained are used to present predictions for the \begin{document}$ \rho(s)$\end{document}
-parameter as well as to the elastic slope \begin{document}$ B(s)$\end{document}
at high energies. 相似文献
26.
Mathematical Notes - It is proved that the lattice of all Fitting classes of finite groups is not distributive, and conditions under which Fitting classes satisfy the distributive and modular laws... 相似文献
27.
Stolpovskaya N. V. Kruzhilin A. A. Zorina A. V. Shikhaliev Kh. S. Ledeneva I. V. Kosheleva E. A. Vandyshev D. Yu. 《Russian Journal of Organic Chemistry》2019,55(9):1322-1328
Russian Journal of Organic Chemistry - A procedure has been proposed for the synthesis of a series of substituted N-(1,3-thiazol-2-yl)-pyrimidin-2-amines and N-(pyrimidin-2-yl)thioureas by... 相似文献
28.
29.
30.
Two new divalent copper (C1) and zinc (C2) chelates having the formulae [M(PIMC)2] (where M = Cu(II), Zn(II) and PIMC = Ligand [(E)-3-(((3-hydroxypyridin-2-yl)imino)methyl)-4H-chromen-4-one] were obtained and characterized by several techniques. Structures and geometries of the synthesized complexes were judged based on the results of alternative analytical and spectral tools supporting the proposed formulae. IR spectral data confirmed the coordination of the ligands to the copper and zinc centers as monobasic tridentate in the enol form. Thermal analysis, UV-Vis spectra and magnetic moment confirmed the geometry around the copper center to be tetrahedral, square pyramidal and octahedral. Study of the binding ability of the synthesized compounds with Circulating tumor DNA (CT-DNA) bas been evaluated applying UV-Vis spectral titration and viscosity measurements. The copper and zinc oxides were achieved from the copper and zinc nano-particles structures Schiff base complexes as the raw material after calcination for 5 hr at 600°C. On the other hand, synthesized of C1 and C2 NPs were used as suitable precursors to the preparation of CuO and ZnO NPs. Finally, the synthesized of the two complexes exhibited enhanced activity against the tested bacterial (Staphylococcus aureus and Escherichia Coli) and fungal strains (Candida albicans and Aspergillus fumigatus) as compared to HPIMC. Among all these synthesized compounds, C1 exhibits good cleaving ability compared to other newly synthesized C2. 相似文献