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   1641863篇
  免费   137215篇
  国内免费   3939篇
耳鼻咽喉   22147篇
儿科学   53850篇
妇产科学   46870篇
基础医学   231879篇
口腔科学   48073篇
临床医学   145671篇
内科学   321262篇
皮肤病学   34670篇
神经病学   132582篇
特种医学   66344篇
外国民族医学   474篇
外科学   248342篇
综合类   45603篇
现状与发展   11篇
一般理论   563篇
预防医学   127469篇
眼科学   36984篇
药学   125467篇
  37篇
中国医学   4992篇
肿瘤学   89727篇
  2018年   15956篇
  2016年   14086篇
  2015年   16332篇
  2014年   22152篇
  2013年   33888篇
  2012年   46144篇
  2011年   48522篇
  2010年   28978篇
  2009年   27329篇
  2008年   46163篇
  2007年   48378篇
  2006年   48927篇
  2005年   47033篇
  2004年   46018篇
  2003年   43944篇
  2002年   42844篇
  2001年   76755篇
  2000年   79448篇
  1999年   66889篇
  1998年   17894篇
  1997年   16474篇
  1996年   16417篇
  1995年   16127篇
  1994年   15173篇
  1993年   14314篇
  1992年   55510篇
  1991年   53875篇
  1990年   52629篇
  1989年   50920篇
  1988年   47312篇
  1987年   46649篇
  1986年   44358篇
  1985年   42975篇
  1984年   32163篇
  1983年   27659篇
  1982年   16231篇
  1981年   14503篇
  1980年   13628篇
  1979年   30526篇
  1978年   21112篇
  1977年   17811篇
  1976年   16723篇
  1975年   17598篇
  1974年   21501篇
  1973年   20685篇
  1972年   18859篇
  1971年   17777篇
  1970年   16297篇
  1969年   15272篇
  1968年   13955篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
81.
82.
83.
84.
85.
86.
87.
88.
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   
89.

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   
90.
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   
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