全文获取类型
收费全文 | 17168篇 |
免费 | 1300篇 |
国内免费 | 66篇 |
专业分类
耳鼻咽喉 | 165篇 |
儿科学 | 612篇 |
妇产科学 | 352篇 |
基础医学 | 2050篇 |
口腔科学 | 404篇 |
临床医学 | 2243篇 |
内科学 | 2875篇 |
皮肤病学 | 207篇 |
神经病学 | 1453篇 |
特种医学 | 477篇 |
外科学 | 2586篇 |
综合类 | 216篇 |
一般理论 | 11篇 |
预防医学 | 1917篇 |
眼科学 | 376篇 |
药学 | 1462篇 |
中国医学 | 19篇 |
肿瘤学 | 1109篇 |
出版年
2023年 | 83篇 |
2022年 | 144篇 |
2021年 | 410篇 |
2020年 | 262篇 |
2019年 | 377篇 |
2018年 | 425篇 |
2017年 | 346篇 |
2016年 | 351篇 |
2015年 | 449篇 |
2014年 | 609篇 |
2013年 | 875篇 |
2012年 | 1259篇 |
2011年 | 1261篇 |
2010年 | 687篇 |
2009年 | 597篇 |
2008年 | 1020篇 |
2007年 | 1108篇 |
2006年 | 1038篇 |
2005年 | 1074篇 |
2004年 | 969篇 |
2003年 | 861篇 |
2002年 | 839篇 |
2001年 | 194篇 |
2000年 | 158篇 |
1999年 | 213篇 |
1998年 | 178篇 |
1997年 | 134篇 |
1996年 | 118篇 |
1995年 | 98篇 |
1994年 | 106篇 |
1993年 | 95篇 |
1992年 | 115篇 |
1991年 | 112篇 |
1990年 | 102篇 |
1989年 | 95篇 |
1988年 | 93篇 |
1987年 | 87篇 |
1986年 | 91篇 |
1985年 | 83篇 |
1984年 | 115篇 |
1983年 | 95篇 |
1982年 | 87篇 |
1981年 | 99篇 |
1980年 | 86篇 |
1979年 | 79篇 |
1978年 | 91篇 |
1977年 | 68篇 |
1976年 | 73篇 |
1974年 | 80篇 |
1973年 | 72篇 |
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
1.
2.
3.
ObjectivesTo fill an empirical gap in the literature by examining changes in quality of care measures occurring when multispecialty clinic systems were acquired by hospital-owned, vertically integrated health care delivery systems in the Twin Cities area.ConclusionsMoving a clinic system into a vertically integrated delivery system resulted in limited increases in quality of care indicators. Caution is warranted when the acquisition causes disruption in referral patterns. 相似文献
4.
5.
6.
7.
Jennifer C. Sasaki Ashley Allemang Steven M. Bryce Laura Custer Kerry L. Dearfield Yasmin Dietz Azeddine Elhajouji Patricia A. Escobar Albert J. Fornace Jr Roland Froetschl Sheila Galloway Ulrike Hemmann Giel Hendriks Heng-Hong Li Mirjam Luijten Gladys Ouedraogo Lauren Peel Stefan Pfuhler Daniel J. Roberts Véronique Thybaud Jan van Benthem Carole L. Yauk Maik Schuler 《Environmental and molecular mutagenesis》2020,61(1):114-134
In May 2017, the Health and Environmental Sciences Institute's Genetic Toxicology Technical Committee hosted a workshop to discuss whether mode of action (MOA) investigation is enhanced through the application of the adverse outcome pathway (AOP) framework. As AOPs are a relatively new approach in genetic toxicology, this report describes how AOPs could be harnessed to advance MOA analysis of genotoxicity pathways using five example case studies. Each of these genetic toxicology AOPs proposed for further development includes the relevant molecular initiating events, key events, and adverse outcomes (AOs), identification and/or further development of the appropriate assays to link an agent to these events, and discussion regarding the biological plausibility of the proposed AOP. A key difference between these proposed genetic toxicology AOPs versus traditional AOPs is that the AO is a genetic toxicology endpoint of potential significance in risk characterization, in contrast to an adverse state of an organism or a population. The first two detailed case studies describe provisional AOPs for aurora kinase inhibition and tubulin binding, leading to the common AO of aneuploidy. The remaining three case studies highlight provisional AOPs that lead to chromosome breakage or mutation via indirect DNA interaction (inhibition of topoisomerase II, production of cellular reactive oxygen species, and inhibition of DNA synthesis). These case studies serve as starting points for genotoxicity AOPs that could ultimately be published and utilized by the broader toxicology community and illustrate the practical considerations and evidence required to formalize such AOPs so that they may be applied to genetic toxicity evaluation schemes. Environ. Mol. Mutagen. 61:114–134, 2020. © 2019 Wiley Periodicals, Inc. 相似文献
8.
Bryan Mclaughlin JungHwan Yang Woohyun Yoo Bret Shaw Soo Yun Kim Dhavan Shah 《Health communication》2016,31(6):762-771
The growth of online support groups has led to an expression effects paradigm within the health communication literature. Although religious support expression is characterized as a typical subdimension of emotional support, we argue that in the context of a life-threatening illness, the inclusion of a religious component creates a unique communication process. Using data from an online group for women with breast cancer, we test a theoretical expression effects model. Results demonstrate that for breast cancer patients, religious support expression has distinct effects from general emotional support messages, which highlights the need to further theorize expression effects along these lines. 相似文献
9.