全文获取类型
收费全文 | 7579篇 |
免费 | 607篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 114篇 |
儿科学 | 284篇 |
妇产科学 | 273篇 |
基础医学 | 1083篇 |
口腔科学 | 117篇 |
临床医学 | 916篇 |
内科学 | 1289篇 |
皮肤病学 | 131篇 |
神经病学 | 753篇 |
特种医学 | 195篇 |
外科学 | 735篇 |
综合类 | 58篇 |
一般理论 | 10篇 |
预防医学 | 873篇 |
眼科学 | 157篇 |
药学 | 499篇 |
中国医学 | 33篇 |
肿瘤学 | 693篇 |
出版年
2023年 | 52篇 |
2022年 | 79篇 |
2021年 | 206篇 |
2020年 | 162篇 |
2019年 | 195篇 |
2018年 | 186篇 |
2017年 | 144篇 |
2016年 | 192篇 |
2015年 | 192篇 |
2014年 | 300篇 |
2013年 | 378篇 |
2012年 | 595篇 |
2011年 | 570篇 |
2010年 | 333篇 |
2009年 | 326篇 |
2008年 | 520篇 |
2007年 | 501篇 |
2006年 | 475篇 |
2005年 | 439篇 |
2004年 | 457篇 |
2003年 | 453篇 |
2002年 | 389篇 |
2001年 | 63篇 |
2000年 | 29篇 |
1999年 | 67篇 |
1998年 | 91篇 |
1997年 | 77篇 |
1996年 | 52篇 |
1995年 | 58篇 |
1994年 | 57篇 |
1993年 | 54篇 |
1992年 | 39篇 |
1991年 | 33篇 |
1990年 | 33篇 |
1989年 | 29篇 |
1988年 | 20篇 |
1987年 | 21篇 |
1986年 | 18篇 |
1985年 | 26篇 |
1984年 | 27篇 |
1983年 | 17篇 |
1982年 | 24篇 |
1981年 | 23篇 |
1978年 | 16篇 |
1975年 | 14篇 |
1974年 | 11篇 |
1973年 | 18篇 |
1972年 | 19篇 |
1971年 | 11篇 |
1970年 | 11篇 |
排序方式: 共有8213条查询结果,搜索用时 343 毫秒
21.
Abdulmassih S. Iskandrian Jeffrey Johnson Tung T. Le Valerie Wasserleben Virginia Cave Jaekyeong Heo 《Journal of nuclear cardiology》1994,1(2):144-149
Background
This study compared the prognostic value of exercise single-photon emission computed tomographic (SPECT) thallium imaging with that of treadmill exercise score in medically treated patients with coronary artery disease (CAD) 相似文献22.
23.
24.
Jonathan M Hodgson Kevin D Croft Trevor A Mori Valerie Burke Lawrence J Beilin Ian B Puddey 《The Journal of nutrition》2002,132(1):55-58
Prospective studies suggest that tea may protect against cardiovascular disease. A potential mechanism for such an effect involves inhibition of lipid peroxidation by polyphenolic antioxidants derived from tea. Our objective was to determine whether regular ingestion of tea could inhibit in vivo lipid peroxidation. Two controlled intervention studies assessed the effects of regular ingestion of tea on lipid peroxidation determined by measurement of urinary F(2)-isoprostane excretion. Study 1: The effects of 1000 mL/d of green tea and black tea were compared with hot water containing caffeine in 13 subjects with elevated blood pressure using a randomized 3-period (7 d each) crossover design. Study 2: The effects of 1250 mL/d of black tea were compared with hot water in 22 subjects with mildly raised serum total cholesterol concentrations using a randomized 2-period (4 wk each) crossover design. F(2)-isoprostane excretion was not altered after regular ingestion of green tea (273 +/- 48 pmol/mmol creatinine) or black tea (274 +/- 39 pmol/mmol creatinine) in comparison with hot water (263 +/- 47 pmol/mmol creatinine; Study 1), or by regular ingestion of black tea (334 +/- 71 pmol/mmol creatinine) in comparison with hot water (355 +/- 75 pmol/mmol creatinine; Study 2). These results do not support the suggestion that polyphenolic antioxidants derived from tea inhibit in vivo lipid peroxidation. 相似文献
25.
26.
The purpose of this study was to assess differences in bereavement outcomes between surviving spouses aged 50 and over who remarried within 4-5 years and those who did not. Fifteen bereaved respondents out of 192 in a longitudinal prospective study who later remarried were compared with 15 other matched nonremarried respondents. Analyses of sociodemographic data, standardized measures of depression, life-satisfaction, resolution of grief, and self-perceived ratings of coping, stress, self-esteem, health and social support were performed with correlated t-tests. Statistically significant differences indicated that over time, the remarried subjects displayed more positive outcomes. 相似文献
27.
28.
Valerie J. Gillet Glenn Myatt Zsolt Zsoldos A. Peter Johnson 《Perspectives in Drug Discovery and Design》1995,3(1):34-50
Summary Several components of a system for structure generation are now well developed. HIPPO is a program that characterises a receptor binding site for potential target sites within the cavity that can be used in de novo design. The target sites include simple and complex hydrogen bonds, covalent bonds and bonds to metal ions. The SPROUT program for structure generation consists of two main components: the first is skeleton generation, followed by atom substitution to convert the solution skeletons to molecules. A new method of skeleton generation is presented here, where part skeletons are grown outwards from each target site. The part skeletons are then connected together to form solution skeletons. Finally the CAESA program is described, that ranks the output from SPROUT according to ease of synthesis. 相似文献
29.
30.