全文获取类型
收费全文 | 2337篇 |
免费 | 67篇 |
国内免费 | 4篇 |
专业分类
化学 | 1568篇 |
晶体学 | 23篇 |
力学 | 61篇 |
数学 | 226篇 |
物理学 | 530篇 |
出版年
2024年 | 2篇 |
2023年 | 11篇 |
2022年 | 65篇 |
2021年 | 88篇 |
2020年 | 53篇 |
2019年 | 52篇 |
2018年 | 55篇 |
2017年 | 54篇 |
2016年 | 106篇 |
2015年 | 71篇 |
2014年 | 109篇 |
2013年 | 132篇 |
2012年 | 145篇 |
2011年 | 192篇 |
2010年 | 124篇 |
2009年 | 134篇 |
2008年 | 138篇 |
2007年 | 144篇 |
2006年 | 110篇 |
2005年 | 103篇 |
2004年 | 90篇 |
2003年 | 38篇 |
2002年 | 53篇 |
2001年 | 25篇 |
2000年 | 37篇 |
1999年 | 16篇 |
1998年 | 23篇 |
1997年 | 17篇 |
1996年 | 16篇 |
1995年 | 25篇 |
1994年 | 20篇 |
1993年 | 14篇 |
1992年 | 10篇 |
1991年 | 24篇 |
1990年 | 16篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 3篇 |
1977年 | 4篇 |
1975年 | 5篇 |
1974年 | 2篇 |
1955年 | 1篇 |
排序方式: 共有2408条查询结果,搜索用时 0 毫秒
41.
Rodrigo Cardoso Magno Lorian Cobra Straker Wanderley de Souza Marcia Attias 《Microscopy and microanalysis》2005,11(2):166-174
Toxoplasma gondii, the causative agent of toxoplasmosis, is capable of actively penetrating and multiplying in any nucleated cell of warm-blooded animals. Its survival strategies include escape from fusion of the parasitophorous vacuole with host cell lysosomes and rearrangement of host cell organelles in relation to the parasitophorous vacuole. In this article we report the rearrangement of host cell organelles and elements of the cytoskeleton of LLCMK2 cells, a lineage derived from green monkey kidney epithelial cells, in response to infection by T. gondii tachyzoites. Transmission electron microscopy made on flat embedded monolayers cut horizontally to the apical side of the cells or field emission scanning electron microscopy of monolayers scraped with scotch tape before sputtering showed that association of mitochondria to the vacuole is much less frequent than previously described. On the other hand, all parasitophorous vacuoles were surrounded by elements of the endoplasmic reticulum. These data were complemented by observations by laser scanning microscopy using fluorescent probes from mitochondria and endoplasmic reticulum and reinforced by three-dimensional reconstruction from serial sections observed by transmission electron microscopy and labeling of mitochondria and endoplasmic reticulum by fluorescent probes. 相似文献
42.
Magno Aparecido G. Trindade Glaucia Maria da Silva Valdir Souza Ferreira 《Microchemical Journal》2005,81(2):209-216
This work presents an electroanalytical methodology developed for square-wave voltammetry based in the electrochemical reduction in hanging mercury drop electrode (HMDE), which is simple, fast, reliable and sensitive for determination of moxifloxacin (MOXI) in tablets and spiked urine human samples. The support electrolyte that provided a more defined and intense peak current for MOXI determination was the phosphate buffer 0.04 mol l− 1 pH 8.0. In the best-optimized conditions the drug presented an only peak of reduction at − 1.38 V vs. Ag/AgCl, using an Eacc. of − 0.30 V. An LOD of 0.44 and 3.20 ng ml− 1 and an LOQ of 1.46 and 10.60 ng ml− 1 were found for the pure standard of moxifloxacin and in the presence of matrix, respectively. A good recovery was obtained for assay spiked urine samples and a good quantification of MOXI was achieved in a commercial formulation. The methodology proposed was more sensitive than the spectrofluorimetric and spectrophotometric method with precision and accuracy equivalent. 相似文献
43.
44.
45.
46.
47.
48.
E. Baggio-Saitovitch R. B. Scorzelli I. Souza Azevedo C. Diaz-Aguila 《Hyperfine Interactions》1994,83(1):425-429
La2–x
Ca
x
Cu0.99Fe0.01O4–y
samples with 0.00 x 0.30 were studied by X-ray diffraction and Mössbauer spectroscopy after heat treatment under different atmospheres (air, oxygen and helium). The variation of the relative population and the hyperfine interactions of the sites as well as the change in the lattice parameters were obtained.On leave from National Center for Scientific Research, PO Box 6990, Havana, Cuba. 相似文献
49.
50.