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   1145篇
  免费   120篇
  国内免费   1篇
耳鼻咽喉   3篇
儿科学   88篇
妇产科学   25篇
基础医学   167篇
口腔科学   46篇
临床医学   122篇
内科学   276篇
皮肤病学   20篇
神经病学   79篇
特种医学   131篇
外科学   68篇
综合类   19篇
一般理论   1篇
预防医学   64篇
眼科学   1篇
药学   107篇
中国医学   1篇
肿瘤学   48篇
  2022年   11篇
  2021年   11篇
  2019年   10篇
  2018年   18篇
  2017年   15篇
  2016年   16篇
  2015年   29篇
  2014年   29篇
  2013年   38篇
  2012年   40篇
  2011年   36篇
  2010年   62篇
  2009年   31篇
  2008年   37篇
  2007年   35篇
  2006年   30篇
  2005年   24篇
  2004年   24篇
  2003年   22篇
  2002年   14篇
  2001年   21篇
  2000年   21篇
  1999年   16篇
  1998年   31篇
  1997年   41篇
  1996年   29篇
  1995年   37篇
  1994年   28篇
  1993年   41篇
  1992年   23篇
  1991年   23篇
  1990年   35篇
  1989年   31篇
  1988年   41篇
  1987年   26篇
  1986年   22篇
  1985年   32篇
  1984年   15篇
  1983年   18篇
  1982年   24篇
  1981年   23篇
  1980年   15篇
  1979年   22篇
  1978年   15篇
  1977年   8篇
  1976年   16篇
  1975年   7篇
  1974年   8篇
  1968年   9篇
  1966年   7篇
排序方式: 共有1266条查询结果,搜索用时 15 毫秒
101.
The purpose of this review is to examine what is known about cognitive and brain aging in elders with chronic epilepsy. We contend that much remains to be learned about the ultimate course of cognition and brain structure in persons with chronic epilepsy and concern appears warranted. Individuals with chronic epilepsy are exposed to many risk factors demonstrated to be associated with abnormal cognitive and brain aging in the general population, with many of these risk factors present in persons with chronic epilepsy as early as midlife. We suggest that a research agenda be developed to systematically identify and treat known modifiable risk factors in order to protect and promote cognitive and brain health in aging and elder persons with chronic epilepsy.  相似文献   
102.
103.
104.
105.
Certain clinical and cardiac morphologic findings are presented in two men who developed massive right ventricular (RV) infarction with only minimal or no left ventricular infarction early after aortic valve replacement. The ostium of the right coronary artery was severely narrowed in one patient by the ring of the bioprosthesis, and in the other patient the right coronary artery was completely severed at the time of valve replacement without insertion of a coronary bypass conduit. Such massive infarction of the RV free wall has not been reported previously.  相似文献   
106.
Testicular schistosomiasis caused by Schistosoma mansoni is very rare and more so when associated with primary infertility. A 40 years old man from the Jos Plateau, North Central Nigeria presented with primary infertility after ten years of marriage. Sperm count revealed oligospermia and he also complained of inability to sustain erection. Testicular biopsy revealed several ova of Schistosoma mansoni in the connective tissue of the testes. Cases of infertility in endemic areas especially when there is no supply of potable water should raise suspicion of schistosomiasis among other pathologies and possible hormonal disturbances when the testes are involved.  相似文献   
107.
108.
M. Hakimi  M. Sager  M. Herten  J. Windolf 《Injury》2010,41(7):717-723
The use of platelet-rich plasma (PRP) for improving of bone defect healing is discussed controversially. The aim of this study was to assess the effect of PRP in combination with autologous cancellous graft on bone defect healing in a critical metaphyseal long bone defect. A critical size defect in the tibial metaphysis of 16 mini-pigs was filled either with autologous cancellous graft as control group or with autologous cancellous graft combined with autologous PRP. Compared to native blood platelets were enriched about 4.9-fold in the PRP. After 6 weeks, the specimens were assessed by X-ray and histological evaluation. Histomorphometrical analysis revealed that the area of new bone was significantly higher in the PRP group concerning the central area of the defect zone (p < 0.02) as well as the cortical defect zone (p < 0.01). All defects showed substantial new bone formation, but only defects of the PRP group regenerated entirely. The PRP group was superior to the control group even in the semi-quantitative assessment of the osseous bridging in both observed areas of the defect. Within the limits of the present study it could be demonstrated that PRP combined with autologous cancellous graft leads to a significantly better bone regeneration compared to isolated application of autologous cancellous graft in an in vivo critical size defect on load-bearing long bones of mini-pigs.  相似文献   
109.
110.
Besides the use of autologous bone grafting several osteoconductive and osteoinductive methods have been reported to improve bone healing. However, persistent non‐union occurs in a considerable number of cases and compromised angiogenesis is suspected to impede bone regeneration. Hyperbaric oxygen therapy (HBO) improves angiogenesis. This study evaluates the effects of HBO on bone defects treated with autologous bone grafting in a bone defect model in rabbits. Twenty‐four New‐Zealand White Rabbits were subjected to a unilateral critical sized diaphyseal radius bone defect and treated with autologous cancellous bone transplantation. The study groups were exposed to an additional HBO treatment regimen. Bone regeneration was evaluated radiologically and histologically at 3 and 6 weeks, angiogenesis was assessed by immunohistochemistry at three and six weeks. The additional administration of HBO resulted in a significantly increased new bone formation and angiogenesis compared to the sole treatment with autologous bone grafting. These results were apparent after three and six weeks of treatment. The addition of HBO therapy to autologous bone grafts leads to significantly improved bone regeneration. The increase in angiogenesis observed could play a crucial role for the results observed. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 33:513–520, 2015.  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