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   1291593篇
  免费   95202篇
  国内免费   2079篇
耳鼻咽喉   18384篇
儿科学   42616篇
妇产科学   38227篇
基础医学   189170篇
口腔科学   35901篇
临床医学   109360篇
内科学   255620篇
皮肤病学   26974篇
神经病学   100761篇
特种医学   50441篇
外国民族医学   366篇
外科学   200159篇
综合类   26580篇
现状与发展   2篇
一般理论   304篇
预防医学   93686篇
眼科学   29357篇
药学   98632篇
  1篇
中国医学   2532篇
肿瘤学   69801篇
  2018年   12533篇
  2016年   10478篇
  2015年   12089篇
  2014年   16680篇
  2013年   25314篇
  2012年   35057篇
  2011年   37391篇
  2010年   22053篇
  2009年   20815篇
  2008年   36208篇
  2007年   39193篇
  2006年   39670篇
  2005年   38964篇
  2004年   37317篇
  2003年   36247篇
  2002年   35758篇
  2001年   58192篇
  2000年   59640篇
  1999年   50792篇
  1998年   14368篇
  1997年   12940篇
  1996年   13182篇
  1995年   12452篇
  1994年   11851篇
  1993年   10938篇
  1992年   41042篇
  1991年   40407篇
  1990年   39916篇
  1989年   38738篇
  1988年   36142篇
  1987年   35377篇
  1986年   33757篇
  1985年   32170篇
  1984年   23956篇
  1983年   20833篇
  1982年   12347篇
  1981年   10910篇
  1979年   22629篇
  1978年   15862篇
  1977年   13701篇
  1976年   12959篇
  1975年   14181篇
  1974年   16678篇
  1973年   16053篇
  1972年   15316篇
  1971年   14227篇
  1970年   13209篇
  1969年   12735篇
  1968年   11974篇
  1967年   10467篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
The aim of the present study was to evaluate the antimicrobial activity of two synbiotic combinations, Lactobacillus fermentum with short-chain fructooligosaccharides (FOS-LF) and Bifidobacterium longum with isomaltooligosaccharides (IMO-BL), against enterohaemorrhagic Escherichia coli O157:H7 and enteropathogenic E. coli O86. Antimicrobial activity was determined (1) by co-culturing the synbiotics and pathogens in batch cultures, and (2) with the three-stage continuous culture system (gut model), inoculated with faecal slurry from an elderly donor. In the co-culture experiments, IMO-BL was significantly inhibitory to both E. coli strains, while FOS-LF was slightly inhibitory or not inhibitory. Factors other than acid production appeared to play a role in the inhibition. In the gut models, both synbiotics effectively inhibited E. coli O157 in the first vessel, but not in vessels 2 and 3. E. coli O86 was not significantly inhibited.  相似文献   
63.
64.
65.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
66.
67.
68.
69.
70.
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery.  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