全文获取类型
收费全文 | 8465篇 |
免费 | 573篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 45篇 |
儿科学 | 208篇 |
妇产科学 | 147篇 |
基础医学 | 993篇 |
口腔科学 | 333篇 |
临床医学 | 1073篇 |
内科学 | 1419篇 |
皮肤病学 | 54篇 |
神经病学 | 755篇 |
特种医学 | 345篇 |
外科学 | 905篇 |
综合类 | 507篇 |
一般理论 | 13篇 |
预防医学 | 1016篇 |
眼科学 | 164篇 |
药学 | 679篇 |
中国医学 | 3篇 |
肿瘤学 | 396篇 |
出版年
2023年 | 53篇 |
2022年 | 65篇 |
2021年 | 172篇 |
2020年 | 104篇 |
2019年 | 148篇 |
2018年 | 207篇 |
2017年 | 140篇 |
2016年 | 168篇 |
2015年 | 176篇 |
2014年 | 232篇 |
2013年 | 369篇 |
2012年 | 627篇 |
2011年 | 683篇 |
2010年 | 366篇 |
2009年 | 329篇 |
2008年 | 577篇 |
2007年 | 683篇 |
2006年 | 605篇 |
2005年 | 616篇 |
2004年 | 599篇 |
2003年 | 583篇 |
2002年 | 493篇 |
2001年 | 118篇 |
2000年 | 83篇 |
1999年 | 86篇 |
1998年 | 101篇 |
1997年 | 66篇 |
1996年 | 44篇 |
1995年 | 48篇 |
1994年 | 42篇 |
1993年 | 53篇 |
1992年 | 38篇 |
1991年 | 32篇 |
1990年 | 39篇 |
1989年 | 26篇 |
1988年 | 21篇 |
1987年 | 27篇 |
1986年 | 27篇 |
1985年 | 21篇 |
1984年 | 21篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1980年 | 12篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1974年 | 9篇 |
1973年 | 19篇 |
1971年 | 10篇 |
1970年 | 9篇 |
1969年 | 8篇 |
排序方式: 共有9055条查询结果,搜索用时 15 毫秒
101.
102.
103.
Do governing body and CSU nurses on clinical commissioning groups really lead a nursing agenda? Findings from a 2015 Survey of the Commissioning Nurse Leaders' Network Membership 下载免费PDF全文
104.
The experiences and preparedness of family carers for best interest decision‐making of a relative living with advanced dementia: A qualitative study 下载免费PDF全文
105.
106.
107.
Rajakulendran T Sahmi M Kurinov I Tyers M Therrien M Sicheri F 《Proceedings of the National Academy of Sciences of the United States of America》2008,105(8):2836-2841
RAF kinase functions in the mitogen-activated protein kinase (MAPK) pathway to transmit growth signals to the downstream kinases MEK and ERK. Activation of RAF catalytic activity is facilitated by a regulatory complex comprising the proteins CNK (Connector enhancer of KSR), HYP (Hyphen), and KSR (Kinase Suppressor of Ras). The sterile alpha-motif (SAM) domain found in both CNK and HYP plays an essential role in complex formation. Here, we have determined the x-ray crystal structure of the SAM domain of CNK in complex with the SAM domain of HYP. The structure reveals a single-junction SAM domain dimer of 1:1 stoichiometry in which the binding mode is a variation of polymeric SAM domain interactions. Through in vitro and in vivo mutational analyses, we show that the specific mode of dimerization revealed by the crystal structure is essential for RAF signaling and facilitates the recruitment of KSR to form the CNK/HYP/KSR regulatory complex. We present two docking-site models to account for how SAM domain dimerization might influence the formation of a higher-order CNK/HYP/KSR complex. 相似文献
108.
109.
Das S Huengsberg M Natin D Walzman M;West Midland Regional Audit Committee 《International journal of STD & AIDS》2004,15(8):558-559
We audited the practice of offering, and the uptake of, an HIV antibody test amongst genitourinary medicine clinic patients in the West Midlands region. There were wide variations in the offering (from 14 to 100%) and uptake (18 to 64%) of the test in the different clinics within the same region. 相似文献
110.
Osborne AH Vance D Rohling EJ Barton N Rogerson M Fello N 《Proceedings of the National Academy of Sciences of the United States of America》2008,105(43):16444-16447
It is widely accepted that modern humans originated in sub-Saharan Africa approximately 150-200 thousand years ago (ka), but their route of dispersal across the currently hyperarid Sahara remains controversial. Given that the first modern humans north of the Sahara are found in the Levant approximately 120-90 ka, northward dispersal likely occurred during a humid episode in the Sahara within Marine Isotope Stage (MIS) 5e (130-117 ka). The obvious dispersal route, the Nile, may be ruled out by notable differences between archaeological finds in the Nile Valley and the Levant at the critical time. Further west, space-born radar images reveal networks of-now buried-fossil river channels that extend across the desert to the Mediterranean coast, which represent alternative dispersal corridors. These corridors would explain scattered findings at desert oases of Middle Stone Age Aterian lithic industries with bifacial and tanged points that can be linked with industries further to the east and as far north as the Mediterranean coast. Here we present geochemical data that demonstrate that water in these fossil systems derived from the south during wet episodes in general, and penetrated all of the way to the Mediterranean during MIS 5e in particular. This proves the existence of an uninterrupted freshwater corridor across a currently hyperarid region of the Sahara at a key time for early modern human migrations to the north and out of Africa. 相似文献