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   1297987篇
  免费   95776篇
  国内免费   2077篇
耳鼻咽喉   18441篇
儿科学   42909篇
妇产科学   38287篇
基础医学   190410篇
口腔科学   37571篇
临床医学   109939篇
内科学   255808篇
皮肤病学   27042篇
神经病学   100943篇
特种医学   50473篇
外国民族医学   367篇
外科学   200129篇
综合类   26795篇
现状与发展   1篇
一般理论   307篇
预防医学   95329篇
眼科学   29330篇
药学   99466篇
  1篇
中国医学   2727篇
肿瘤学   69565篇
  2018年   12718篇
  2016年   10753篇
  2015年   12434篇
  2014年   17037篇
  2013年   25630篇
  2012年   35470篇
  2011年   38062篇
  2010年   22341篇
  2009年   20823篇
  2008年   36355篇
  2007年   39226篇
  2006年   39704篇
  2005年   38751篇
  2004年   37226篇
  2003年   36129篇
  2002年   35599篇
  2001年   58492篇
  2000年   60019篇
  1999年   51073篇
  1998年   14366篇
  1997年   12907篇
  1996年   13166篇
  1995年   12427篇
  1994年   11829篇
  1993年   10917篇
  1992年   41137篇
  1991年   40509篇
  1990年   40030篇
  1989年   38838篇
  1988年   36246篇
  1987年   35447篇
  1986年   33810篇
  1985年   32232篇
  1984年   24001篇
  1983年   20881篇
  1982年   12411篇
  1981年   10963篇
  1979年   22707篇
  1978年   15937篇
  1977年   13767篇
  1976年   12996篇
  1975年   14244篇
  1974年   16737篇
  1973年   16131篇
  1972年   15342篇
  1971年   14259篇
  1970年   13263篇
  1969年   12767篇
  1968年   12010篇
  1967年   10521篇
排序方式: 共有10000条查询结果,搜索用时 46 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