全文获取类型
收费全文 | 2113篇 |
免费 | 114篇 |
国内免费 | 10篇 |
专业分类
化学 | 1016篇 |
晶体学 | 12篇 |
力学 | 54篇 |
数学 | 111篇 |
物理学 | 473篇 |
无线电 | 571篇 |
出版年
2024年 | 3篇 |
2023年 | 25篇 |
2022年 | 24篇 |
2021年 | 43篇 |
2020年 | 29篇 |
2019年 | 41篇 |
2018年 | 35篇 |
2017年 | 33篇 |
2016年 | 65篇 |
2015年 | 56篇 |
2014年 | 71篇 |
2013年 | 143篇 |
2012年 | 137篇 |
2011年 | 125篇 |
2010年 | 99篇 |
2009年 | 97篇 |
2008年 | 143篇 |
2007年 | 140篇 |
2006年 | 139篇 |
2005年 | 125篇 |
2004年 | 97篇 |
2003年 | 93篇 |
2002年 | 97篇 |
2001年 | 60篇 |
2000年 | 48篇 |
1999年 | 31篇 |
1998年 | 29篇 |
1997年 | 25篇 |
1996年 | 37篇 |
1995年 | 33篇 |
1994年 | 18篇 |
1993年 | 18篇 |
1992年 | 16篇 |
1991年 | 14篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1974年 | 4篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1968年 | 2篇 |
1963年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有2237条查询结果,搜索用时 875 毫秒
71.
72.
Kyeong‐Ryoon Lee Sung Heum Choi Jin‐Sook Song Hyewon Seo Yoon‐Jee Chae Hwang Eui Cho Jin Hee Ahn Sung‐Hoon Ahn Myung Ae Bae 《Biomedical chromatography : BMC》2013,27(7):846-852
In this study, we developed a method for the determination of PF‐04620110 (2‐{(1r,4r)‐4‐[4‐(4‐amino‐5‐oxo‐7,8‐dihydropyrimido[5,4‐f][1,4]oxazepin‐6(5H)‐yl)phenyl]cyclohexyl}acetic acid), a novel diacylglycerol acyltransferase 1 (DGAT‐1) inhibitor, in rat plasma and validated it using liquid chromatography–tandem mass spectrometry (LC‐MS/MS). Rat plasma samples were processed following a protein precipitation method by using acetonitrile and were then injected into an LC‐MS/MS system for quantification. PF‐04620110 and imipramine (internal standard) were separated using a Hypersil Gold C18 column, with a mixture of acetonitrile and 10 mm ammonium formate (90:10, v/v) as the mobile phase. The ion transitions monitored in positive‐ion mode [M + H]+ of multiple‐reaction monitoring were m/z 397.0 → 260.2 for PF‐04620110 and m/z 280.8 → 86.0 for imipramine. The detector response was specific and linear for PF‐04620110 at concentrations within the range 0.05–50 µg/mL and the signal‐to‐noise ratios for the samples were ≥10. The intra‐ and inter‐day precision and accuracy of the method matched the acceptance criteria for assay validation. PF‐04620110 was stable under various processing and/or handling conditions. PF‐04620110 concentrations in the rat plasma samples could be measured up to 24 h after intravenous or oral administration of PF‐04620110, suggesting that the assay is useful for pharmacokinetic studies in rats. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
73.
74.
75.
76.
77.
78.
79.
Junwye Lee Jonghyun Koo Si Un Hwang Sunmin Min Sang Jung Ahn Yonghan Roh Sung Ha Park 《Current Applied Physics》2012,12(4):1207-1211
We report the structural and functional stabilities of artificially synthesized DNA ultra-thin films. Fully covered DNA ultra-thin films on a silica substrate were fabricated by the silica-assisted growth method and those samples were then incubated in various chemicals and physical conditions. The DNA ultra-thin films showed high maintainability under those harsh conditions and these results would aid to facilitate the use of artificial DNA ultra-thin films in advanced research areas such as biophotonics and bioelectronics. 相似文献
80.