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   1657411篇
  免费   137652篇
  国内免费   2723篇
耳鼻咽喉   22355篇
儿科学   54513篇
妇产科学   47668篇
基础医学   237134篇
口腔科学   48852篇
临床医学   146892篇
内科学   325622篇
皮肤病学   34945篇
神经病学   135549篇
特种医学   67019篇
外国民族医学   502篇
外科学   250875篇
综合类   40242篇
现状与发展   3篇
一般理论   629篇
预防医学   127901篇
眼科学   37672篇
药学   125451篇
  2篇
中国医学   3100篇
肿瘤学   90860篇
  2018年   15851篇
  2016年   13826篇
  2015年   16092篇
  2014年   21999篇
  2013年   33677篇
  2012年   45584篇
  2011年   47987篇
  2010年   28523篇
  2009年   27230篇
  2008年   45896篇
  2007年   48294篇
  2006年   49094篇
  2005年   47586篇
  2004年   46998篇
  2003年   44835篇
  2002年   43988篇
  2001年   77241篇
  2000年   79877篇
  1999年   67843篇
  1998年   18542篇
  1997年   17031篇
  1996年   16889篇
  1995年   16634篇
  1994年   15569篇
  1993年   14753篇
  1992年   56489篇
  1991年   54804篇
  1990年   53535篇
  1989年   51817篇
  1988年   48028篇
  1987年   47357篇
  1986年   45055篇
  1985年   43566篇
  1984年   32567篇
  1983年   28073篇
  1982年   16522篇
  1981年   14817篇
  1980年   13908篇
  1979年   30954篇
  1978年   21363篇
  1977年   18066篇
  1976年   16943篇
  1975年   17868篇
  1974年   21797篇
  1973年   20946篇
  1972年   19117篇
  1971年   17993篇
  1970年   16485篇
  1969年   15444篇
  1968年   14087篇
排序方式: 共有10000条查询结果,搜索用时 531 毫秒
81.
82.
83.
84.
85.
86.
87.
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   
88.

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   
89.
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   
90.
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