首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2855篇
  免费   173篇
  国内免费   18篇
耳鼻咽喉   64篇
儿科学   138篇
妇产科学   117篇
基础医学   309篇
口腔科学   104篇
临床医学   259篇
内科学   596篇
皮肤病学   73篇
神经病学   255篇
特种医学   56篇
外科学   381篇
综合类   21篇
一般理论   3篇
预防医学   318篇
眼科学   60篇
药学   161篇
中国医学   3篇
肿瘤学   128篇
  2023年   19篇
  2022年   52篇
  2021年   72篇
  2020年   44篇
  2019年   80篇
  2018年   83篇
  2017年   59篇
  2016年   79篇
  2015年   96篇
  2014年   105篇
  2013年   147篇
  2012年   211篇
  2011年   211篇
  2010年   125篇
  2009年   122篇
  2008年   202篇
  2007年   198篇
  2006年   169篇
  2005年   162篇
  2004年   174篇
  2003年   106篇
  2002年   119篇
  2001年   67篇
  2000年   51篇
  1999年   36篇
  1998年   10篇
  1997年   15篇
  1996年   9篇
  1995年   6篇
  1994年   6篇
  1993年   4篇
  1992年   11篇
  1991年   20篇
  1990年   15篇
  1989年   11篇
  1988年   11篇
  1987年   9篇
  1986年   15篇
  1985年   10篇
  1983年   9篇
  1979年   7篇
  1978年   10篇
  1977年   7篇
  1975年   13篇
  1974年   7篇
  1973年   5篇
  1972年   5篇
  1971年   13篇
  1970年   4篇
  1969年   8篇
排序方式: 共有3046条查询结果,搜索用时 15 毫秒
31.
32.
33.
A 42‐year‐old female patient was referred our clinic for investigation of a history of acute retinal artery occlusion. Transthoracic echocardiography showed a cyst‐like, mobile formation on posterior mitral valve leaflet. 2D and real time 3D transesophageal echocardiography showed a flexible circular mobile structure which was attached to posterior mitral valve leaflet. Echocardiographic appearance and morphological characteristics were suggestive of accessory mitral valve tissue.  相似文献   
34.
We presented a 77‐year‐old man with hypertrophic obstructive cardiomyopathy applied with flail tricuspid leaflet and severe tricuspid regurgitation leading to right heart failure 2 months after the failed septal ablation. The ruptured anterior tricuspid papillary muscle resulted from infarction of the base of anterior papillary muscle of the right ventricle (RV) confirmed by magnetic resonance imaging. As the septomarginal band is frequently lit up by intracoronary contrast that particular attention should be paid to the RV papillary muscles. And, if the papillary muscles or the RV free wall is brightened, then the use of that septal artery should be avoided.  相似文献   
35.
36.
In Finland, a dental subsidization reform, implemented in 2001–2002, abolished age restrictions on subsidized dental care. We investigated income‐related inequality in oral health‐related quality of life (OHRQoL) and its determinants among adult Finns before and after the reform. Three cross‐sectional postal surveys, focusing on perceived oral health and the use of dental services among people born before 1971, were conducted in 2001 (= 2,046), 2004 (= 1,728), and 2007 (= 1,560). Five measures, based on the Oral Health Impact Profile‐14, were used as indicators of OHRQoL. Income‐related inequality and associated factors were analysed using the concentration index and its decomposition. Prevalence, extent, and severity of oral health impacts were slightly lower in 2007 than in 2001. The oral health impacts were concentrated, at all study time points, among individuals with lower income. Most of the inequality was related to self‐perceived general health, tooth loss, and income. Contributions of time since the last dental visit and satisfaction with the last treatment period to the inequality decreased from 2001 to 2007. However, the contributions of these factors were already small (10–20%) in 2001. In general, OHRQoL improved slightly; however, no clear or dramatic change in inequality in OHRQoL was seen after the reform.  相似文献   
37.
A new anthrax vaccine that could accelerate the immune response and possibly reduce the number of injections needed for protection would be desirable in a post-exposure setting.  相似文献   
38.
39.
OBJECTIVE: Adenosine exerts antiinflammatory effects via activation of the A3 adenosine receptor (A3AR), a Gi protein-associated cell-surface receptor, overexpressed in synovial tissue and peripheral blood mononuclear cells (PBMC) in patients with active rheumatoid arthritis (RA). CF101 is a highly specific orally bioavailable A3AR agonist. METHODS: This was a multicenter study, blinded to dose, designed to assess the clinical activity and safety of CF101 in active RA. Seventy-four patients were randomized to receive 0.1, 1.0, or 4.0 mg CF101 bid for 12 weeks. The primary efficacy endpoint was American College of Rheumatology 20% response (ACR20) at Week 12. A3AR expression levels were analyzed in PBMC from 18 patients. RESULTS:. Maximal responses were observed with 1.0 mg bid, lower at 0.1 and 4.0 mg bid. At 12 weeks, 55.6%, 33.3%, and 11.5% of the patients receiving 1.0 mg CF101 achieved ACR20%, 50%, and 70% responses, respectively. CF101 was generally well tolerated, with mild headache (4.1%), nausea (2.7%), and rash (2.7%) being the most common treatment-related adverse events. Statistically significant correlations between A3AR overexpression at baseline and ACR50 and ACR70 responses were observed. CONCLUSION: CF101 administered bid for 12 weeks resulted in improvement in signs and symptoms of RA that did not achieve statistical significance, and was safe and well tolerated. The expression level of A3AR was directly correlated with patient responses to CF101, suggesting its utilization as a biomarker for the pharmacodynamic and therapeutic effects of this novel agent. These findings require confirmation in a double-blind randomized placebo-controlled trial, currently under way.  相似文献   
40.
PIAS proteins promote SUMO-1 conjugation to STAT1   总被引:6,自引:0,他引:6       下载免费PDF全文
  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号