全文获取类型
收费全文 | 1757篇 |
免费 | 84篇 |
国内免费 | 5篇 |
专业分类
化学 | 1239篇 |
晶体学 | 1篇 |
力学 | 26篇 |
数学 | 391篇 |
物理学 | 189篇 |
出版年
2023年 | 12篇 |
2022年 | 10篇 |
2021年 | 32篇 |
2020年 | 31篇 |
2019年 | 48篇 |
2018年 | 24篇 |
2017年 | 17篇 |
2016年 | 55篇 |
2015年 | 54篇 |
2014年 | 52篇 |
2013年 | 58篇 |
2012年 | 114篇 |
2011年 | 138篇 |
2010年 | 69篇 |
2009年 | 52篇 |
2008年 | 77篇 |
2007年 | 81篇 |
2006年 | 105篇 |
2005年 | 96篇 |
2004年 | 60篇 |
2003年 | 62篇 |
2002年 | 58篇 |
2001年 | 45篇 |
2000年 | 46篇 |
1999年 | 41篇 |
1998年 | 41篇 |
1997年 | 31篇 |
1996年 | 31篇 |
1995年 | 28篇 |
1994年 | 29篇 |
1993年 | 25篇 |
1992年 | 36篇 |
1991年 | 31篇 |
1990年 | 23篇 |
1989年 | 15篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 13篇 |
1982年 | 6篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 3篇 |
1976年 | 7篇 |
1975年 | 3篇 |
1974年 | 6篇 |
1973年 | 4篇 |
1971年 | 3篇 |
排序方式: 共有1846条查询结果,搜索用时 62 毫秒
31.
Protein-protein interactions play crucial roles in various biological pathways and functions. Therefore, the characterization of protein levels and also the network of interactions within an organism would contribute considerably to the understanding of life. The availability of the human genome sequence has created a range of new possibilities for biomedical research. A crucial challenge is to utilize the genetic information for better understanding of protein distribution and function in normal as well as in pathological biological processes. In this review, we have focused on different platforms used for systematic genome-based proteome analyses. These technologies are in many ways complementary and should be seen as various ways to elucidate different functions of the proteome. 相似文献
32.
Reaction of aminosilanetriol RSi(OH)(3) (1) (R = (2,6-i-Pr(2)C(6)H(3))N(SiMe(3))) with diethyl zinc at room temperature in 1:1 stoichiometric ratio affords [(THF)Zn(O(2)(OH)SiR)](4) (2) (R = (2,6-i-Pr(2)C(6)H(3))N(SiMe(3))) in good yield. The single-crystal X-ray diffraction studies reveal that 2 is monoclinic, P2(1), with a = 17.117(3) A, b = 16.692(5) A, c = 17.399(4) A, alpha = gamma = 90 degrees, beta = 91.45(7) degrees, and Z = 2. The molecular structure of 2 contains two puckered eight-membered Zn(2)Si(2)O(4) rings, which are connected by the Zn-O bonds and form two planar four-membered Zn(2)O(2) rings. Compound 2 contains an unreacted hydroxyl group on each silicon atom, and hence, we carried out the reactions of 2 with dimethylzinc and methyllithium to form [Zn(4)(THF)(4)(MeZn)(4)(O(3)SiR)(4)] (3) (R = (2,6-i-Pr(2)C(6)H(3))N(SiMe(3))) and [(L)ZnLi(O(3)SiR)](4) (4) (L = 1,4-(Me(2)N)(2)C(6)H(4), R = (2,6-i-Pr(2)C(6)H(3))N(SiMe(3))), respectively. This suggested that 2 could be an intermediate product formed during the synthesis of 3 and 4. 相似文献
33.
34.
Mathias JM 《OR manager》1995,11(11):1, 6-1, 8
Hernia surgery, a bread and butter operation for many hospitals, seems a likely candidate for streamlining, standardization, and package pricing. But there's no consensus on the best way to do hernia repairs. Surgeons differ vehemently on which approach is preferable. The mesh plug attracted attention this summer when its advocate, Ira Rutkow, MD, appeared on TV. But the patch, traditional open repair, and laparoscopy also have their advocates. Here's a look at the techniques and why you're unlikely to see consensus soon. 相似文献
35.
36.
37.
Mathias JM 《OR manager》1996,12(2):1, 9-1,10
38.
39.
40.
Mathias JM 《OR manager》1993,9(7):1, 10-1, 11