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   1336799篇
  免费   114763篇
  国内免费   6377篇
耳鼻咽喉   16714篇
儿科学   43004篇
妇产科学   36629篇
基础医学   183693篇
口腔科学   36293篇
临床医学   120654篇
内科学   278566篇
皮肤病学   31906篇
神经病学   110562篇
特种医学   55560篇
外国民族医学   274篇
外科学   210556篇
综合类   31525篇
现状与发展   2篇
一般理论   414篇
预防医学   106533篇
眼科学   28102篇
药学   93805篇
  5篇
中国医学   2230篇
肿瘤学   70912篇
  2018年   13434篇
  2017年   10666篇
  2016年   12840篇
  2015年   14350篇
  2014年   20018篇
  2013年   29826篇
  2012年   36371篇
  2011年   39005篇
  2010年   24437篇
  2009年   23959篇
  2008年   36483篇
  2007年   38862篇
  2006年   39996篇
  2005年   38585篇
  2004年   36784篇
  2003年   35885篇
  2002年   33877篇
  2001年   66055篇
  2000年   67924篇
  1999年   56593篇
  1998年   16732篇
  1997年   15021篇
  1996年   16019篇
  1995年   16234篇
  1994年   15106篇
  1993年   14154篇
  1992年   47100篇
  1991年   45748篇
  1990年   43970篇
  1989年   41816篇
  1988年   38758篇
  1987年   38082篇
  1986年   35860篇
  1985年   34635篇
  1984年   26358篇
  1983年   22109篇
  1982年   13848篇
  1981年   12448篇
  1980年   11720篇
  1979年   23545篇
  1978年   17073篇
  1977年   14386篇
  1976年   13183篇
  1975年   13722篇
  1974年   16093篇
  1973年   15396篇
  1972年   14174篇
  1971年   13036篇
  1970年   11880篇
  1969年   11101篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Deep brain stimulation (DBS) in psychiatric illnesses has been clinically tested over the past 20 years. The clinical application of DBS to the superolateral branch of the medial forebrain bundle in treatment‐resistant depressed patients—one of several targets under investigation—has shown to be promising in a number of uncontrolled open label trials. However, there are remain numerous questions that need to be investigated to understand and optimize the clinical use of DBS in depression, including, for example, the relationship between the symptoms, the biological substrates/projections and the stimulation itself. In the context of precision and customized medicine, the current paper focuses on clinical and experimental research of medial forebrain bundle DBS in depression or in animal models of depression, demonstrating how clinical and scientific progress can work in tandem to test the therapeutic value and investigate the mechanisms of this experimental treatment. As one of the hypotheses is that depression engenders changes in the reward and motivational networks, the review looks at how stimulation of the medial forebrain bundle impacts the dopaminergic system.  相似文献   
132.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
133.

Background

Bone mineral density (BMD) has been found to improve after parathyroidectomy (PTX) in patients with primary hyperparathyroidism. There are few data on the effect of PTX on BMD in normocalcemic and normohormonal primary hyperparathyroidism.

Methods

A retrospective analysis of 92 primary hyperparathyroidism patients who underwent PTX between 2004 and 2012 with pre- and post-PTX dual-energy x-ray absorptiometry was performed. Within-person changes in BMD pre- and post-PTX were analyzed using log linear mixed models, stratified by biochemical status.

Results

Bone mineral density increased post-PTX in the whole cohort at the lumbar spine (+2.5%), femoral neck (+2.1%), and total hip (+1.9%) and decreased at the one-third radius (–0.9%). On comparison of BMD changes by profile, BMD increased in those with the typical profile at the lumbar spine (3.2%), femoral neck (2.9%), and total hip (2.9%) but declined at the one-third radius (–1.5%). In contrast, BMD improved only at the femoral neck (4.3%) in the normohormonal group and did not change at any site in the normocalcemic group. The typical group had a greater increase in BMD over time at the femoral neck and total hip compared with normocalcemic patients.

Conclusion

Our results indicate that the skeletal benefit of PTX was attenuated in normocalcemic and normohormonal patients, suggesting that skeletal changes after PTX may depend on biochemical profile.  相似文献   
134.
135.
136.
137.
138.
139.
Lung - Diaphragmatic paralysis (DP) is an important cause of dyspnea with many underlying etiologies; however, frequently no cause is identified despite extensive investigation. We hypothesized...  相似文献   
140.
Journal of Thrombosis and Thrombolysis - C1-inhibitor (C1INH) was shown to enhance thrombin generation (TG) in the presence of thrombomodulin (TM) by reducing production of activated protein C....  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