全文获取类型
收费全文 | 1714714篇 |
免费 | 116605篇 |
国内免费 | 2460篇 |
学科分类
医药卫生 | 1833779篇 |
出版年
2018年 | 16754篇 |
2016年 | 14260篇 |
2015年 | 16293篇 |
2014年 | 22286篇 |
2013年 | 33735篇 |
2012年 | 47279篇 |
2011年 | 51092篇 |
2010年 | 29896篇 |
2009年 | 27783篇 |
2008年 | 48520篇 |
2007年 | 52833篇 |
2006年 | 53001篇 |
2005年 | 51751篇 |
2004年 | 49930篇 |
2003年 | 48533篇 |
2002年 | 47494篇 |
2001年 | 75243篇 |
2000年 | 77262篇 |
1999年 | 65366篇 |
1998年 | 18555篇 |
1997年 | 16322篇 |
1996年 | 16627篇 |
1995年 | 15653篇 |
1994年 | 14749篇 |
1993年 | 13800篇 |
1992年 | 52200篇 |
1991年 | 52536篇 |
1990年 | 52159篇 |
1989年 | 50759篇 |
1988年 | 47249篇 |
1987年 | 46424篇 |
1986年 | 44064篇 |
1985年 | 42167篇 |
1984年 | 31413篇 |
1983年 | 27223篇 |
1982年 | 15790篇 |
1981年 | 14101篇 |
1979年 | 29906篇 |
1978年 | 21106篇 |
1977年 | 17988篇 |
1976年 | 17454篇 |
1975年 | 19539篇 |
1974年 | 22869篇 |
1973年 | 22034篇 |
1972年 | 20764篇 |
1971年 | 19530篇 |
1970年 | 18213篇 |
1969年 | 17322篇 |
1968年 | 16331篇 |
1967年 | 14482篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
E. Likotrafiti K. M. Tuohy G. R. Gibson R. A. Rastall 《International journal of food sciences and nutrition》2016,67(2):83-91
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
24.
25.
Stelter K. Theodoraki M. N. Becker S. Tsekmistrenko V. Olzowy B. Ledderose G. 《European archives of oto-rhino-laryngology》2015,272(3):639-639
European Archives of Oto-Rhino-Laryngology - 相似文献
26.
27.
28.
29.
Michael E Egger Joanna M Ohlendorf Charles R Scoggins Kelly M McMasters Robert C G Martin II 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2015,17(9):839-845
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