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   2341791篇
  免费   183401篇
  国内免费   4507篇
耳鼻咽喉   31851篇
儿科学   78837篇
妇产科学   66602篇
基础医学   336033篇
口腔科学   68703篇
临床医学   209576篇
内科学   452564篇
皮肤病学   51477篇
神经病学   188981篇
特种医学   92140篇
外国民族医学   753篇
外科学   353138篇
综合类   57784篇
现状与发展   3篇
一般理论   892篇
预防医学   183383篇
眼科学   54096篇
药学   173925篇
  6篇
中国医学   4460篇
肿瘤学   124495篇
  2018年   22886篇
  2016年   20100篇
  2015年   23020篇
  2014年   31675篇
  2013年   48538篇
  2012年   64914篇
  2011年   68715篇
  2010年   40915篇
  2009年   38828篇
  2008年   65335篇
  2007年   69016篇
  2006年   70120篇
  2005年   67833篇
  2004年   66594篇
  2003年   63879篇
  2002年   62243篇
  2001年   107817篇
  2000年   111352篇
  1999年   94106篇
  1998年   26212篇
  1997年   23864篇
  1996年   23640篇
  1995年   23046篇
  1994年   21613篇
  1993年   20336篇
  1992年   77196篇
  1991年   75292篇
  1990年   74017篇
  1989年   71363篇
  1988年   65850篇
  1987年   65454篇
  1986年   61799篇
  1985年   59777篇
  1984年   44944篇
  1983年   38478篇
  1982年   22811篇
  1981年   20492篇
  1980年   19184篇
  1979年   42571篇
  1978年   29991篇
  1977年   25329篇
  1976年   23849篇
  1975年   25085篇
  1974年   30674篇
  1973年   29560篇
  1972年   27120篇
  1971年   25569篇
  1970年   23548篇
  1969年   22055篇
  1968年   20254篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
46.
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   
47.
48.
BackgroundThe measurement of health-related quality of life (HRQoL) provides information about the perceived burden of the health condition and treatments from a lived experience. The Brisbane Burn Scar Impact Profile (caregiver report for young children, BBSIP0–8), developed in 2013, is a proxy-report measure of burn scar-specific HRQoL. The aim of this study was to report its psychometric properties in line with an evaluative purpose.MethodsCaregivers of children up to 8 years of age at risk of burn scarring were recruited into a prospective, longitudinal cohort study. Caregivers completed the BBSIP0–8, Pediatric Quality of Life Inventory and Patient Observer Scar Assessment Scale at baseline (approximately ≥85% of the total body surface area re-epithelialised), 1–2 weeks after baseline and 1-month after baseline. Psychometric properties measured included internal consistency, test–retest reliability, validity and responsiveness.ResultsEighty-six caregivers of mostly male children (55%), of a median age (IQR) of 1 year, 10 months (2 years, 1 month) and total body surface area burn of 1.5% (3.0%) were recruited. Over one third of participants were grafted and 15% had contractures or skin tightness at baseline. Internal consistency of ten item groups ranged from 0.73 to 0.96. Hypothesised correlations of changes in the BBSIP0–8 items with changes in criterion measures supported longitudinal validity (ρ ranging from ?0.73 to 0.68). The majority of item groups had acceptable reproducibility (ICC = 0.65–0.83). The responsiveness of five item groups was supported (AUC = 0.71–0.90).ConclusionThe psychometric properties tested support the use of the BBSIP0–8 as an evaluative measure of burn scar-related health-related quality of life for children aged below eight years in the early post-acute period of rehabilitation. Further investigation at longer time period after burn injury is indicated.  相似文献   
49.
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   
50.
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