全文获取类型
收费全文 | 10750篇 |
免费 | 735篇 |
国内免费 | 64篇 |
专业分类
耳鼻咽喉 | 63篇 |
儿科学 | 244篇 |
妇产科学 | 283篇 |
基础医学 | 1536篇 |
口腔科学 | 399篇 |
临床医学 | 996篇 |
内科学 | 2191篇 |
皮肤病学 | 192篇 |
神经病学 | 1328篇 |
特种医学 | 322篇 |
外科学 | 1259篇 |
综合类 | 24篇 |
现状与发展 | 1篇 |
一般理论 | 8篇 |
预防医学 | 967篇 |
眼科学 | 121篇 |
药学 | 687篇 |
中国医学 | 49篇 |
肿瘤学 | 879篇 |
出版年
2024年 | 11篇 |
2023年 | 116篇 |
2022年 | 202篇 |
2021年 | 426篇 |
2020年 | 259篇 |
2019年 | 393篇 |
2018年 | 433篇 |
2017年 | 343篇 |
2016年 | 394篇 |
2015年 | 371篇 |
2014年 | 468篇 |
2013年 | 607篇 |
2012年 | 872篇 |
2011年 | 848篇 |
2010年 | 453篇 |
2009年 | 425篇 |
2008年 | 671篇 |
2007年 | 642篇 |
2006年 | 629篇 |
2005年 | 571篇 |
2004年 | 534篇 |
2003年 | 473篇 |
2002年 | 383篇 |
2001年 | 115篇 |
2000年 | 82篇 |
1999年 | 110篇 |
1998年 | 59篇 |
1997年 | 69篇 |
1996年 | 39篇 |
1995年 | 34篇 |
1994年 | 32篇 |
1993年 | 24篇 |
1992年 | 51篇 |
1991年 | 65篇 |
1990年 | 34篇 |
1989年 | 41篇 |
1988年 | 32篇 |
1987年 | 33篇 |
1986年 | 27篇 |
1985年 | 25篇 |
1984年 | 26篇 |
1983年 | 8篇 |
1982年 | 15篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1977年 | 11篇 |
1974年 | 12篇 |
1973年 | 8篇 |
1971年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Francesca Galeffi Simone Degan Gavin Britz Dennis A Turner 《Journal of cerebral blood flow and metabolism》2016,36(4):696-701
We investigated microvascular reactivity to synaptic train stimulation after induction of subarachnoid hemorrhage in adult rats, analyzing tissue oxygen levels [pO2] in intact hippocampus. In control rats, hippocampal pO2 averaged 11.4 mm Hg whereas hemodynamic responses averaged 13.1 mm Hg (to a 25 s train). After subarachnoid hemorrhage (at 2 days), we recorded a dramatic elevation in baseline pO2 in the hippocampus (to 68.4 mm Hg) accompanied by inverted pO2 responses to synaptic train stimulation (−9.46 mm Hg). These significant changes in baseline hippocampal pO2 and inverted pO2 responses after subarachnoid hemorrhage indicate severe alterations of neurovascular coupling and neuronal viability. 相似文献
132.
Marc Rosenbaum Virginia Andreani Tanya Kapoor Simone Herp Henrik Flach Marlena Duchniewicz Rudolf Grosschedl 《Genes & development》2014,28(11):1165-1178
MZB1 (pERp1) is a B-cell-specific and endoplasmic reticulum (ER)-localized protein implicated in antibody secretion and integrin-mediated cell adhesion. Here, we examine the role of MZB1 in vivo by conditional gene inactivation in the mouse germline and at different stages of B lymphopoiesis. Deletion of MZB1 impairs humoral immune responses and antibody secretion in plasma cells that naturally undergo ER stress. In addition, we found that experimental induction of ER stress by tunicamycin injections in mice results in a block of pro-B-cell to pre-B-cell differentiation specifically in Mzb1−/− mice. A similar developmental block was observed in Mzb1fl/flmb1Cre mice, whereby a Cre recombinase-induced genotoxic stress unmasks a role for MZB1 in the surface expression of immunoglobulin µ heavy chains (µHCs). MZB1 associates directly with the substrate-specific chaperone GRP94 (also called HSP90B1 or gp96) in an ATP-sensitive manner and is required for the interaction of GRP94 with µHCs upon ER stress. Thus, MZB1 seems to act as a substrate-specific cochaperone of GRP94 that enables proper biosynthesis of µHCs under conditions of ER stress. 相似文献
133.
134.
Simone T. Boerema Lex van Velsen Miriam M. R. Vollenbroek-Hutten Hermie J. Hermens 《Assistive technology : the official journal of RESNA》2017,29(2):76-84
In the aging society, the need for the elderly to remain mobile and independent is higher than ever. However, many aids supporting mobility often fail to target real needs and lack acceptance. The aim of this study is to demonstrate how value-based design can contribute to the design of mobility aids that address real needs and thus, lead to high acceptance. We elicited values, facilitators, and barriers of mobility of older adults via ten in-depth interviews. Next, we held co-creation sessions, resulting in several designs of innovative mobility aids, which were evaluated for acceptance via nine in-depth interviews. The interviews resulted in a myriad of key values, such as “independence from family” and “doing their own groceries.” Design sessions resulted in three designs for a wheeled walker. Their acceptance was rather low. Current mobility device users were more eager to accept the designs than non-users. The value-based approach offers designers a close look into the lives of the elderly, thereby opening up a wide range of innovation possibilities that better fit their actual needs. Product service systems seem to be a promising focus for targeting human needs in mobility device design. 相似文献
135.
136.
137.
138.
139.
140.