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   290562篇
  免费   11501篇
  国内免费   822篇
耳鼻咽喉   5876篇
儿科学   8544篇
妇产科学   8625篇
基础医学   45863篇
口腔科学   6789篇
临床医学   20925篇
内科学   61181篇
皮肤病学   9062篇
神经病学   24303篇
特种医学   11876篇
外国民族医学   6篇
外科学   44988篇
综合类   2348篇
现状与发展   2篇
一般理论   143篇
预防医学   15713篇
眼科学   8714篇
药学   15013篇
  2篇
中国医学   292篇
肿瘤学   12620篇
  2021年   2905篇
  2020年   2005篇
  2019年   2841篇
  2018年   3594篇
  2017年   2817篇
  2016年   3267篇
  2015年   6805篇
  2014年   8921篇
  2013年   11916篇
  2012年   14295篇
  2011年   14708篇
  2010年   10237篇
  2009年   9997篇
  2008年   14013篇
  2007年   14566篇
  2006年   14478篇
  2005年   14223篇
  2004年   13316篇
  2003年   11207篇
  2002年   9336篇
  2001年   2235篇
  2000年   1844篇
  1999年   2481篇
  1998年   3251篇
  1997年   2817篇
  1996年   2981篇
  1995年   3018篇
  1994年   2907篇
  1993年   2774篇
  1992年   2535篇
  1991年   2299篇
  1990年   1985篇
  1989年   1804篇
  1988年   1672篇
  1987年   1755篇
  1986年   1635篇
  1985年   1492篇
  1984年   1693篇
  1982年   1829篇
  1981年   1687篇
  1980年   1553篇
  1978年   1502篇
  1933年   1508篇
  1932年   1496篇
  1930年   1660篇
  1928年   1541篇
  1927年   1507篇
  1926年   1587篇
  1925年   1549篇
  1924年   1618篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
Arthroscopic acromioclavicular joint excision is a commonly performed but technically demanding procedure. Incomplete excision can leave residual symptoms. We present a simple, reproducible technique ensuring satisfactory excision of the joint.  相似文献   
34.
35.

Objective

Arch obstruction after the Norwood procedure is common and contributes to mortality. We determined the prevalence, associated factors, and practice variability of arch reintervention and assessed whether arch reintervention is associated with mortality.

Methods

From 2005 to 2017, 593 neonates in the Congenital Heart Surgeons' Society Critical Left Heart Obstruction cohort underwent a Norwood procedure. Median follow-up was 3.7 years. Multivariable parametric models, including a modulated renewal analysis, were performed.

Results

Of the 593 neonates, 146 (25%) underwent 218 reinterventions for arch obstruction after the Norwood procedure: catheter-based (n = 168) or surgical (n = 50) at a median age of 4.3 months (quartile 1-quartile 3, 2.6-5.7). Interdigitation of the distal aortic anastomosis was protective against arch reintervention. Development of ≥ moderate tricuspid valve regurgitation and right ventricular dysfunction at any point was associated with arch reintervention. Nonsignificant variables for arch reintervention included shunt type and preoperative aortic measurements. Surgical arch reintervention was protective against arch reintervention, but transcatheter reintervention was associated with increased reintervention. Arch reintervention was not associated with increased mortality. There was wide institutional variation in incidence of arch reintervention (range, 0-40 reinterventions per 100 years patient follow-up) and in preintervention gradient (range, 0-64 mm Hg).

Conclusions

Interdigitation of the distal aortic anastomosis during the Norwood procedure decreased the risk of arch reintervention. Surgical arch reintervention is more definitive than transcatheter. Arch reintervention after the Norwood procedure is not associated with increased mortality. Serial surveillance for arch obstruction, integrated with changes in right ventricular function and tricuspid valve regurgitation, is recommended after the Norwood procedure to improve outcomes.  相似文献   
36.
37.
38.
39.
TL1A is a TNF‐like cytokine which has been shown to co‐stimulate TH1 and TH17 responses during chronic inflammation. The expression of this novel cytokine has been investigated in inflammatory disorders like rheumatoid arthritis and inflammatory bowel disease, but little is known about expression and induction in psoriasis. Indeed, the pathogenesis in psoriasis is still not fully understood and it is speculated that cytokines other than TNF‐α are important in subsets of patients. Also, for patients with severe disease that are treated with systemic anti‐TNF‐α blockade, novel candidates to be used as disease and response biomarkers are of high interest. Here, we demonstrate TL1A expression in biopsies from psoriatic lesions. Also, we investigated spontaneous and induced TL1A secretion from PBMCs and blood levels from a cohort of psoriasis patients. Here, increased spontaneous secretion from PBMCs was observed as compared to healthy controls and a small subset of patients had highly elevated TL1A in the blood. Interestingly, activation of PBMCs with various cytokines showed a decreased sensitivity for TL1A activation in psoriasis patients compared to healthy controls.TL1A levels in blood and biopsies could not be correlated with disease activity with this patient cohort. Thus, additional large‐scale studies are warranted to investigate TL1A as a biomarker.  相似文献   
40.
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