全文获取类型
| 收费全文 | 1079654篇 |
| 免费 | 73462篇 |
| 国内免费 | 1382篇 |
专业分类
| 耳鼻咽喉 | 15059篇 |
| 儿科学 | 34697篇 |
| 妇产科学 | 28784篇 |
| 基础医学 | 154316篇 |
| 口腔科学 | 29697篇 |
| 临床医学 | 95322篇 |
| 内科学 | 204981篇 |
| 皮肤病学 | 24568篇 |
| 神经病学 | 82019篇 |
| 特种医学 | 43343篇 |
| 外国民族医学 | 201篇 |
| 外科学 | 164143篇 |
| 综合类 | 21718篇 |
| 现状与发展 | 1篇 |
| 一般理论 | 264篇 |
| 预防医学 | 74750篇 |
| 眼科学 | 24608篇 |
| 药学 | 86465篇 |
| 7篇 | |
| 中国医学 | 2817篇 |
| 肿瘤学 | 66738篇 |
出版年
| 2019年 | 7854篇 |
| 2018年 | 11403篇 |
| 2017年 | 8995篇 |
| 2016年 | 10195篇 |
| 2015年 | 11391篇 |
| 2014年 | 15431篇 |
| 2013年 | 22414篇 |
| 2012年 | 30881篇 |
| 2011年 | 32643篇 |
| 2010年 | 19140篇 |
| 2009年 | 17969篇 |
| 2008年 | 30284篇 |
| 2007年 | 32395篇 |
| 2006年 | 32998篇 |
| 2005年 | 31350篇 |
| 2004年 | 30019篇 |
| 2003年 | 28872篇 |
| 2002年 | 27842篇 |
| 2001年 | 60149篇 |
| 2000年 | 61641篇 |
| 1999年 | 51047篇 |
| 1998年 | 12510篇 |
| 1997年 | 11046篇 |
| 1996年 | 11067篇 |
| 1995年 | 10372篇 |
| 1994年 | 9393篇 |
| 1993年 | 8900篇 |
| 1992年 | 37890篇 |
| 1991年 | 36363篇 |
| 1990年 | 35833篇 |
| 1989年 | 34396篇 |
| 1988年 | 30967篇 |
| 1987年 | 30090篇 |
| 1986年 | 28315篇 |
| 1985年 | 26529篇 |
| 1984年 | 19246篇 |
| 1983年 | 16162篇 |
| 1982年 | 8850篇 |
| 1979年 | 17064篇 |
| 1978年 | 11448篇 |
| 1977年 | 10259篇 |
| 1976年 | 8860篇 |
| 1975年 | 10097篇 |
| 1974年 | 11678篇 |
| 1973年 | 11304篇 |
| 1972年 | 10792篇 |
| 1971年 | 10125篇 |
| 1970年 | 9279篇 |
| 1969年 | 8969篇 |
| 1968年 | 7942篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
51.
52.
53.
54.
55.
56.
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
57.
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
58.
59.
Paul J. Devlin Brian W. McCrindle James K. Kirklin Eugene H. Blackstone William M. DeCampli Christopher A. Caldarone Ali Dodge-Khatami Pirooz Eghtesady James M. Meza Peter J. Gruber Kristine J. Guleserian Bahaaladin Alsoufi Linda M. Lambert James E. O&#x;Brien Erle H. Austin Jeffrey P. Jacobs Tara Karamlou 《The Journal of thoracic and cardiovascular surgery》2019,157(2):684-695.e8
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60.