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   3383758篇
  免费   256998篇
  国内免费   5017篇
耳鼻咽喉   47189篇
儿科学   111278篇
妇产科学   93884篇
基础医学   492220篇
口腔科学   96867篇
临床医学   306363篇
内科学   649710篇
皮肤病学   74136篇
神经病学   270419篇
特种医学   129301篇
外国民族医学   902篇
外科学   509374篇
综合类   76558篇
现状与发展   13篇
一般理论   1302篇
预防医学   267698篇
眼科学   79354篇
药学   253809篇
  13篇
中国医学   6365篇
肿瘤学   179018篇
  2018年   35834篇
  2017年   27306篇
  2016年   30581篇
  2015年   34772篇
  2014年   48854篇
  2013年   74012篇
  2012年   101224篇
  2011年   107498篇
  2010年   63854篇
  2009年   60553篇
  2008年   101459篇
  2007年   107888篇
  2006年   109105篇
  2005年   106142篇
  2004年   102695篇
  2003年   98362篇
  2002年   95990篇
  2001年   151279篇
  2000年   156023篇
  1999年   131954篇
  1998年   38384篇
  1997年   34013篇
  1996年   33989篇
  1995年   32527篇
  1994年   30223篇
  1993年   28536篇
  1992年   105580篇
  1991年   103219篇
  1990年   100824篇
  1989年   97431篇
  1988年   90233篇
  1987年   88575篇
  1986年   83758篇
  1985年   80683篇
  1984年   60488篇
  1983年   51892篇
  1982年   30800篇
  1981年   27770篇
  1979年   56837篇
  1978年   40256篇
  1977年   33764篇
  1976年   32171篇
  1975年   34399篇
  1974年   41624篇
  1973年   39823篇
  1972年   37170篇
  1971年   35101篇
  1970年   32373篇
  1969年   30752篇
  1968年   28117篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Abstract The future challenge for improving stroke patients’ outcome will be to implement new Stroke Units (SUs) worldwide. However the best SU model remains uncertain. The aim of this study was to evaluate the number of SUs and the quality characteristics of acute stroke care in Italy. We conducted a SU survey in Italy, interviewing the directors of the hospital wards that discharged at least 50 acute stroke patients a year. A SU was defined as an acute ward area with stroke-dedicated beds and staff. To compare the quality of care provided in SUs with that in general wards (GWs) we investigated the characteristics of five domains: hospital setting, unit setting, staffing, process of care and diagnostic investigations. We identified 68 SUs and 677 GWs. Multivariate logistic regression analyses demonstrated that SUs compared to GWs had higher quality scores in unit setting (ROC area=0.9721), staffing (ROC area=0.8760) and care organisation (ROC area=0.7984). The hospital setting (ROC area=0.7033) and the availability of rapid diagnostic investigations (ROC area=0.7164) had lower power in discriminating SU from GW. In Italy in 2003/04 only 9% of the hospital services had organised SU care. The study demonstrated that SUs admitted more than 100 patients per year, had more monitoring equipment and staffing time, and practised multidisciplinary meetings and early mobilisation. The utility of these structural and performance characteristics needs validation from outcome studies.  相似文献   
994.
目的:确定UVB靶向光疗治疗局限性银屑病是否安全有效及是否存在量效关系。设计:随机、对评估者设盲对照研究。机构:泰国曼谷大学医院皮肤病门诊。患者:14例稳定性局限性斑块型银屑病患者。干预:依据预定的最小红斑量(M EDs),随机给予患者不同通量的UVB靶向光线治疗,3次/周。在4  相似文献   
995.
996.
INTRODUCTION: Vasopressin, mainly through the V1a-receptor, is thought to be a major player in the maintenance of hyperfiltration. Its inhibition could therefore lead to a decrease in progression of chronic renal failure. To this end, the effect of the vasopressin V1a-receptor-selective antagonist, YM218, was studied on proteinuria and focal glomerulosclerosis in early and late intervention after 5/6 nephrectomy in rats, and compared with an angiotensin-converting enzyme inhibitor (ACE-I). MATERIALS AND METHODS: After 5/6 nephrectomy, early intervention was performed between week 2 and 10 thereafter with the V1a-receptor-selective antagonist (VRA, 10 mg/kg/day, n=10), enalapril (ACE-I, 10 mg/kg/day, n=9), or vehicle (n=8). Late intervention was performed in another group between week 6 and 12 with VRA (10 mg/kg/day, n=7), lisinopril (ACE-I, 5 mg/kg/day, n=7), or vehicle (n=7). RESULTS: In early intervention, proteinuria and focal glomerulosclerosis were significantly decreased by VRA compared to vehicle (44+7% and 59+8% respectively). ACE-I significantly decreased proteinuria (67+7%) and a trend towards a decrease in focal glomerulosclerosis was observed (30+18%). In late intervention, VRA did not decrease proteinuria and focal glomerulosclerosis compared to vehicle (21+20% and 0%, respectively), ACE-I significantly lowered proteinuria (92+2%) and a focal glomerulosclerosis (69+1%) lowering trend was observed. CONCLUSION: These results indicate that VRA may protect against early progression of renal injury after 5/6 nephrectomy, whereas its effectiveness seems limited in established renal damage.  相似文献   
997.
Research coordinators in intensive care are a growing specialty about which little is known. This cross-sectional study surveyed the Australia and New Zealand Intensive Care Research Coordinators' Group (n = 49) regarding demographics, education, employment history, job structure, and role content. Most research coordinators were highly qualified and experienced nurses who undertake pharmaceutical trials, multicenter projects, departmental medical and nursing research, audits and data registries, and their own projects.  相似文献   
998.
999.
1000.
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