全文获取类型
收费全文 | 32975篇 |
免费 | 2103篇 |
国内免费 | 105篇 |
专业分类
耳鼻咽喉 | 298篇 |
儿科学 | 1008篇 |
妇产科学 | 911篇 |
基础医学 | 4828篇 |
口腔科学 | 954篇 |
临床医学 | 4139篇 |
内科学 | 6183篇 |
皮肤病学 | 630篇 |
神经病学 | 3395篇 |
特种医学 | 762篇 |
外科学 | 2852篇 |
综合类 | 263篇 |
现状与发展 | 1篇 |
一般理论 | 46篇 |
预防医学 | 3925篇 |
眼科学 | 472篇 |
药学 | 2201篇 |
中国医学 | 114篇 |
肿瘤学 | 2201篇 |
出版年
2023年 | 329篇 |
2022年 | 424篇 |
2021年 | 829篇 |
2020年 | 554篇 |
2019年 | 884篇 |
2018年 | 1063篇 |
2017年 | 831篇 |
2016年 | 836篇 |
2015年 | 1055篇 |
2014年 | 1268篇 |
2013年 | 1863篇 |
2012年 | 2693篇 |
2011年 | 2767篇 |
2010年 | 1346篇 |
2009年 | 1180篇 |
2008年 | 2183篇 |
2007年 | 2153篇 |
2006年 | 2127篇 |
2005年 | 2060篇 |
2004年 | 1917篇 |
2003年 | 1742篇 |
2002年 | 1649篇 |
2001年 | 238篇 |
2000年 | 183篇 |
1999年 | 216篇 |
1998年 | 281篇 |
1997年 | 231篇 |
1996年 | 199篇 |
1995年 | 169篇 |
1994年 | 131篇 |
1993年 | 118篇 |
1992年 | 127篇 |
1991年 | 94篇 |
1990年 | 98篇 |
1989年 | 72篇 |
1988年 | 66篇 |
1987年 | 61篇 |
1986年 | 92篇 |
1985年 | 79篇 |
1984年 | 104篇 |
1983年 | 93篇 |
1982年 | 117篇 |
1981年 | 98篇 |
1980年 | 79篇 |
1979年 | 53篇 |
1978年 | 47篇 |
1977年 | 35篇 |
1976年 | 29篇 |
1975年 | 28篇 |
1974年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
991.
Ricardo O. Escárcega Joseph J. Franco Bhalaghuru Chokkalingam Mani Apurva Vyas Ellen M. Tedaldi Alfred A. Bove 《International journal of cardiology》2014
In 2012, the United Nations estimated that globally, 34 million people were living with human immunodeficiency virus (HIV) infection at the end of 2011. 相似文献
992.
Elizabeth J. Baker Nancy A. Beck Ellen L. Berg Helene D. Clayton-Jeter P. Charukeshi Chandrasekera J. Lowry Curley Bruce A. Donzanti Lorna C. Ewart Jane M. Gunther J. Gerry Kenna Edward L. LeCluyse Michael N. Liebman Catherine L. Pugh Paul B. Watkins Kristie M. Sullivan 《Drug discovery today》2019,24(2):624-628
993.
994.
995.
Ingrid de Siqueira Pereira Marta Marques Maia Allecineia Bispo da Cruz João Paulo Marochi Telles Jose Ernesto Vidal Ricardo Gava Cristina Silva Meira-Strejevitch Vera Lucia Pereira-Chioccola 《Parasite immunology》2020,42(4):e12696
This study investigated the potential of five miRNA candidates for cerebral toxoplasmosis/HIV co-infection (CT/HIV) biomarkers. miR-155-5p, miR-146a-5p, miR-21-5p, miR-125b-5p and miR-29c-3p were tested in 79 plasma divided into groups: 32 CT/HIV patients; 27 individuals with asymptomatic toxoplasmosis (AT); and 20 individuals seronegative for toxoplasmosis (NC). From each was collected peripheral blood/EDTA for laboratory diagnosis. Blood cells for DNA extractions (molecular diagnosis), plasma for RNA extractions (gene expression) and ELISA (serological diagnosis). miRNA expression was performed by qPCR, and values were expressed in Relative Quantification (RQ). Among the five miRNAs, miR-21-5p and miR-146a-5p were up-expressed in CT/HIV group when compared with AT and NC groups. RQ means for miR-21-5p and miR-146a-5p in CT/HIV group were 3.829 and 2.500, while in AT group, were 1.815 and 1.661, respectively. Differences between 3 groups were statistically significant (Kruskal-Wallis ANOVA test), as well as CT/HIV and AT groups (Mann-Whitney test). Plasma of CT/HIV and AT groups expressed similar levels of miR-29c-3p, miR-155-5p and miR-125b-5p. As NC group was different of CT/HIV and AT groups, differences between three groups were statistically significant (Kruskal-Wallis ANOVA test). No difference was shown between CT/HIV and AT groups (Mann-Whitney test). These results suggest the host miRNAs modulation by Toxoplasma gondii. 相似文献
996.
Ellen C. Caniglia Elizabeth R. Stevens Maria Khan Kailyn E. Young Kaoon Ban Brandon D.L. Marshall Natalie E. Chichetto Julie R. Gaither Stephen Crystal Eva Jennifer Edelman David A. Fiellin Adam J. Gordon Kendall J. Bryant Janet Tate Amy C. Justice Ronald Scott Braithwaite 《Alcoholism, clinical and experimental research》2020,44(11):2257-2265
997.
998.
Palma Paulo Jorge Messias Ana Cerqueira António Rosa Tavares Luís Diogo Caramelo Francisco Roseiro Luís Santos João Miguel 《Odontology / the Society of the Nippon Dental University》2019,107(3):324-332
Odontology - To evaluate the effect of immersion in 3% sodium hypochlorite solution in the resistance to cyclic fatigue of three nickel–titanium (NiTi) rotary file systems, ProTaper Next... 相似文献
999.
1000.
Ana R. Quiñones PhD Susan L. Mitchell MD Jonathan D. Jackson PhD María P. Aranda PhD Peggye Dilworth-Anderson PhD Ellen P. McCarthy PhD Ladson Hinton MD 《Journal of the American Geriatrics Society》2020,68(Z2):S8-S13
Embedded pragmatic clinical trials (ePCTs) advance research on Alzheimer's disease/Alzheimer's disease and related dementias (AD/ADRD) in real-world contexts; however, health equity issues have not yet been fully considered, assessed, or integrated into ePCT designs. Health disparity populations may not be well represented in ePCTs without special efforts to identify and successfully recruit sites of care that serve larger numbers of these populations. The National Institute on Aging (NIA) Imbedded Pragmatic Alzheimer's disease (AD) and AD-Related Dementias (AD/ADRD) Clinical Trials (IMPACT) Collaboratory's Health Equity Team will contribute to the overall mission of the collaboratory by developing and implementing strategies to address health equity in the conduct of ePCTs and ensure the collaboratory is a national resource for all Americans with dementia. As a first step toward meeting these goals, this article reviews what is currently known about the inclusion of health disparities populations of people living with dementia (PLWD) and their caregivers in ePCTs, highlights unique challenges related to health equity in the conduct of ePCTs, and suggests priority areas in the design and implementation of ePCTs to increase the awareness and avoidance of pitfalls that may perpetuate and magnify healthcare disparities. J Am Geriatr Soc 68:S8–S13, 2020 . 相似文献