全文获取类型
收费全文 | 1919篇 |
免费 | 44篇 |
国内免费 | 14篇 |
专业分类
化学 | 1431篇 |
晶体学 | 38篇 |
力学 | 41篇 |
数学 | 140篇 |
物理学 | 327篇 |
出版年
2021年 | 10篇 |
2020年 | 10篇 |
2019年 | 16篇 |
2017年 | 12篇 |
2016年 | 33篇 |
2015年 | 23篇 |
2014年 | 45篇 |
2013年 | 110篇 |
2012年 | 88篇 |
2011年 | 101篇 |
2010年 | 59篇 |
2009年 | 68篇 |
2008年 | 101篇 |
2007年 | 105篇 |
2006年 | 126篇 |
2005年 | 120篇 |
2004年 | 107篇 |
2003年 | 81篇 |
2002年 | 94篇 |
2001年 | 33篇 |
2000年 | 44篇 |
1999年 | 34篇 |
1998年 | 25篇 |
1997年 | 16篇 |
1996年 | 18篇 |
1995年 | 13篇 |
1994年 | 26篇 |
1993年 | 18篇 |
1992年 | 16篇 |
1991年 | 20篇 |
1990年 | 11篇 |
1989年 | 13篇 |
1988年 | 10篇 |
1987年 | 17篇 |
1986年 | 14篇 |
1985年 | 39篇 |
1984年 | 22篇 |
1983年 | 17篇 |
1982年 | 35篇 |
1981年 | 33篇 |
1980年 | 25篇 |
1979年 | 24篇 |
1978年 | 14篇 |
1977年 | 14篇 |
1976年 | 17篇 |
1975年 | 15篇 |
1974年 | 13篇 |
1973年 | 23篇 |
1970年 | 6篇 |
1968年 | 6篇 |
排序方式: 共有1977条查询结果,搜索用时 15 毫秒
121.
Molecularly Designed Nanoparticles by Dispersion of Self‐Assembled Organosiloxane‐Based Mesophases 下载免费PDF全文
Shigeru Sakamoto Yasuhiro Tamura Dr. Hideo Hata Dr. Yasuhiro Sakamoto Prof. Atsushi Shimojima Prof. Kazuyuki Kuroda 《Angewandte Chemie (International ed. in English)》2014,53(35):9173-9177
The design of siloxane‐based nanoparticles is important for many applications. Here we show a novel approach to form core–shell silica nanoparticles of a few nanometers in size through the principle of “dispersion of ordered mesostructures into single nanocomponents”. Self‐assembled siloxane–organic hybrids derived from amphiphilic alkyl‐oligosiloxanes were postsynthetically dispersed in organic solvent to yield uniform nanoparticles consisting of dense lipophilic shells and hydrophilic siloxane cores. In situ encapsulation of fluorescent dyes into the nanoparticles demonstrated their ability to function as nanocarriers. 相似文献
122.
Dr. Roman S. Erdmann Dr. Hideo Takakura Alexander D. Thompson Felix Rivera‐Molina Dr. Edward S. Allgeyer Prof. Dr. Joerg Bewersdorf Prof. Dr. Derek Toomre Prof. Dr. Alanna Schepartz 《Angewandte Chemie (International ed. in English)》2014,53(38):10242-10246
We report a lipid‐based strategy to visualize Golgi structure and dynamics at super‐resolution in live cells. The method is based on two novel reagents: a trans‐cyclooctene‐containing ceramide lipid (Cer‐TCO) and a highly reactive, tetrazine‐tagged near‐IR dye (SiR‐Tz). These reagents assemble via an extremely rapid “tetrazine‐click” reaction into Cer‐SiR, a highly photostable “vital dye” that enables prolonged live‐cell imaging of the Golgi apparatus by 3D confocal and STED microscopy. Cer‐SiR is nontoxic at concentrations as high as 2 μM and does not perturb the mobility of Golgi‐resident enzymes or the traffic of cargo from the endoplasmic reticulum through the Golgi and to the plasma membrane. 相似文献
123.
124.
125.
126.
127.
128.
Large-scale isolation of the minor nucleoside wyosine of torula yeast tRNA(Phe) was accomplished by a combination of enzymatic digestion and reversed-phase chromatography: the wyosine-containing nucleotide fraction, which was obtained by partial digestion of unfractionated tRNA (1 g) with nuclease P1, was concentrated by reversed-phase column chromatography followed by complete digestion with nuclease P1/alkaline phosphatase. The nucleoside mixture thus obtained was purified by reversed-phase HPLC, providing wyosine (70 microg). Comparison of this nucleoside with a chemically synthesized authentic sample has unambiguously established that the structure of wyosine is 4,6-dimethyl-3-beta-D-ribofuranosyl-3,4-dihydro-9H-imidazo[1,2-a]purin-9-one (2). 相似文献
129.
Kato N Sakayanagi M Nakayama T Nishimura H Ogamo A 《Journal of chromatography. A》2002,973(1-2):159-166
A novel detection method for 21 different anions by thin-layer chromatography is presented. Anions on the target plate form salts with amine in a developing solvent and are visualized after staining with citric acid-acetic anhydride reagent as white spots contrasting against a pale red-pink background. This method has particularly high sensitivity for anions of chlorate, sulfate, phosphate, chromate and dichromate (0.02-0.05 microg). The method is demonstrated to efficiently detect toxic arsenite in curry sauce as an example application. The proposed method offers highly efficient indirect detection for a wide range of anions, and serves as a purification procedure for the preparation of anionic sample solutions for other analytical methods. 相似文献
130.
Shinozuka K Matsumoto N Suzuki H Moriguchi T Sawai H 《Chemical communications (Cambridge, England)》2002,(22):2712-2713
A chimeric oligoDNA composed of a natural beta-anomeric oligonucleotide portion and an unnatural alpha-anomeric oligonucleotide portion forms an alternate stranded triplex possessing enhanced thermal stability compared to the triplexes composed of the parental oligomers. 相似文献