全文获取类型
收费全文 | 262646篇 |
免费 | 16648篇 |
国内免费 | 1264篇 |
专业分类
耳鼻咽喉 | 3060篇 |
儿科学 | 6333篇 |
妇产科学 | 4786篇 |
基础医学 | 33853篇 |
口腔科学 | 5124篇 |
临床医学 | 26495篇 |
内科学 | 54896篇 |
皮肤病学 | 4254篇 |
神经病学 | 25728篇 |
特种医学 | 11693篇 |
外国民族医学 | 13篇 |
外科学 | 40375篇 |
综合类 | 2673篇 |
现状与发展 | 4篇 |
一般理论 | 184篇 |
预防医学 | 17621篇 |
眼科学 | 6003篇 |
药学 | 18108篇 |
1篇 | |
中国医学 | 741篇 |
肿瘤学 | 18613篇 |
出版年
2023年 | 1543篇 |
2022年 | 2916篇 |
2021年 | 6392篇 |
2020年 | 3620篇 |
2019年 | 5847篇 |
2018年 | 6976篇 |
2017年 | 5177篇 |
2016年 | 5925篇 |
2015年 | 7209篇 |
2014年 | 9886篇 |
2013年 | 13080篇 |
2012年 | 19903篇 |
2011年 | 20441篇 |
2010年 | 11538篇 |
2009年 | 10462篇 |
2008年 | 17468篇 |
2007年 | 18068篇 |
2006年 | 17414篇 |
2005年 | 17182篇 |
2004年 | 16008篇 |
2003年 | 14584篇 |
2002年 | 13833篇 |
2001年 | 2330篇 |
2000年 | 1814篇 |
1999年 | 2308篇 |
1998年 | 2922篇 |
1997年 | 2329篇 |
1996年 | 2003篇 |
1995年 | 1825篇 |
1994年 | 1596篇 |
1993年 | 1549篇 |
1992年 | 1089篇 |
1991年 | 1051篇 |
1990年 | 891篇 |
1989年 | 837篇 |
1988年 | 763篇 |
1987年 | 687篇 |
1986年 | 713篇 |
1985年 | 740篇 |
1984年 | 950篇 |
1983年 | 824篇 |
1982年 | 1059篇 |
1981年 | 987篇 |
1980年 | 857篇 |
1979年 | 517篇 |
1978年 | 551篇 |
1977年 | 472篇 |
1976年 | 439篇 |
1975年 | 366篇 |
1974年 | 339篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
This article describes a case of anaphylaxis secondary to chlorhexidine during urethral catheterisation. Despite little evidence for the use of antiseptic lubricants in preventing catheter-associated urinary tract infections, the distribution and use of such products continues to be widespread. Chlorhexidine-free lubricating gel is widely available and should be used for urological procedures wherever possible. 相似文献
2.
3.
4.
Ho-Chul Jung Sung-Bin Chon Won Sup Oh Dong-Hyun Lee Ho-Jin Lee 《The American journal of tropical medicine and hygiene》2015,92(2):256-261
Scrub typhus usually presents as acute undifferentiated fever. This cross-sectional study included adult patients presenting with acute undifferentiated fever defined as any febrile illness for ≤ 14 days without evidence of localized infection. Scrub typhus cases were defined by an antibody titer of a ≥ fourfold increase in paired sera, a ≥ 1:160 in a single serum using indirect immunofluorescence assay, or a positive result of the immunochromatographic test. Multiple regression analysis identified predictors associated with scrub typhus to develop a prediction rule. Of 250 cases with known etiology of acute undifferentiated fever, influenza (28.0%), hepatitis A (25.2%), and scrub typhus (16.4%) were major causes. A prediction rule for identifying suspected cases of scrub typhus consisted of age ≥ 65 years (two points), recent fieldwork/outdoor activities (one point), onset of illness during an outbreak period (two points), myalgia (one point), and eschar (two points). The c statistic was 0.977 (95% confidence interval = 0.960–0.994). At a cutoff value ≥ 4, the sensitivity and specificity were 92.7% (79.0–98.1%) and 90.9% (86.0–94.3%), respectively. Scrub typhus, the third leading cause of acute undifferentiated fever in our region, can be identified early using the prediction rule. 相似文献
5.
6.
7.
Benyam Kinde Harrison W. Gabel Caitlin S. Gilbert Eric C. Griffith Michael E. Greenberg 《Proceedings of the National Academy of Sciences of the United States of America》2015,112(22):6800-6806
DNA methylation at CpG dinucleotides is an important epigenetic regulator common to virtually all mammalian cell types, but recent evidence indicates that during early postnatal development neuronal genomes also accumulate uniquely high levels of two alternative forms of methylation, non-CpG methylation and hydroxymethylation. Here we discuss the distinct landscape of DNA methylation in neurons, how it is established, and how it might affect the binding and function of protein readers of DNA methylation. We review studies of one critical reader of DNA methylation in the brain, the Rett syndrome protein methyl CpG-binding protein 2 (MeCP2), and discuss how differential binding affinity of MeCP2 for non-CpG and hydroxymethylation may affect the function of this methyl-binding protein in the nervous system. 相似文献
8.
9.
10.