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   2729749篇
  免费   208699篇
  国内免费   6032篇
耳鼻咽喉   36180篇
儿科学   90509篇
妇产科学   75598篇
基础医学   387482篇
口腔科学   77693篇
临床医学   247646篇
内科学   535974篇
皮肤病学   62782篇
神经病学   217712篇
特种医学   103072篇
外国民族医学   696篇
外科学   411591篇
综合类   63957篇
现状与发展   7篇
一般理论   948篇
预防医学   209415篇
眼科学   64118篇
药学   197092篇
  7篇
中国医学   6592篇
肿瘤学   155409篇
  2019年   21939篇
  2018年   31481篇
  2017年   23854篇
  2016年   26541篇
  2015年   29932篇
  2014年   41992篇
  2013年   62283篇
  2012年   85386篇
  2011年   90508篇
  2010年   53365篇
  2009年   50295篇
  2008年   83720篇
  2007年   88888篇
  2006年   89743篇
  2005年   86371篇
  2004年   83102篇
  2003年   79206篇
  2002年   76358篇
  2001年   138673篇
  2000年   142174篇
  1999年   117712篇
  1998年   32340篇
  1997年   28523篇
  1996年   28600篇
  1995年   27375篇
  1994年   24976篇
  1993年   23255篇
  1992年   89742篇
  1991年   86123篇
  1990年   82880篇
  1989年   79557篇
  1988年   72825篇
  1987年   71163篇
  1986年   66666篇
  1985年   63480篇
  1984年   47408篇
  1983年   40104篇
  1982年   23385篇
  1981年   20810篇
  1979年   41810篇
  1978年   29106篇
  1977年   24484篇
  1976年   23045篇
  1975年   23962篇
  1974年   29009篇
  1973年   27981篇
  1972年   26059篇
  1971年   23910篇
  1970年   22536篇
  1969年   21015篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
71.
72.
73.
Dosage form is a mean used for the delivery of drug to a living body. In order to get the desired effect the drug should be delivered to its site of action at such rate and concentration to achieve the maximum therapeutic effect and minimum adverse effect. Since oral route is still widely accepted route but having a common drawback of difficulty in swallowing of tablets and capsules. Therefore a lot of research has been done on novel drug delivery systems. This review is about oral dispersible tablets a novel approach in drug delivery systems that are now a day''s more focused in formulation world, and laid a new path that, helped the patients to build their compliance level with the therapy, also reduced the cost and ease the administration especially in case of pediatrics and geriatrics. Quick absorption, rapid onset of action and reduction in drug loss properties are the basic advantages of this dosage form.  相似文献   
74.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
75.
76.
77.
Bipolar disorder (BD) is a common psychiatric mood disorder affecting more than 1-2% of the general population of different European countries. Unfortunately, there is no objective laboratory-based test to aid BD diagnosis or monitor its progression, and little is known about the molecular basis of BD. Here, we performed a comparative proteomic study to identify differentially expressed plasma proteins in various BD mood states (depressed BD, manic BD, and euthymic BD) relative to healthy controls. A total of 10 euthymic BD, 20 depressed BD, 15 manic BD, and 20 demographically matched healthy control subjects were recruited. Seven high-abundance proteins were immunodepleted in plasma samples from the 4 experimental groups, which were then subjected to proteome-wide expression profiling by two-dimensional electrophoresis and matrix-assisted laser desorption/ionization-time-of-flight/time-of-flight tandem mass spectrometry. Proteomic results were validated by immunoblotting and bioinformatically analyzed using MetaCore. From a total of 32 proteins identified with 1.5-fold changes in expression compared with healthy controls, 16 proteins were perturbed in BD independent of mood state, while 16 proteins were specifically associated with particular BD mood states. Two mood-independent differential proteins, apolipoprotein (Apo) A1 and Apo L1, suggest that BD pathophysiology may be associated with early perturbations in lipid metabolism. Moreover, down-regulation of one mood-dependent protein, carbonic anhydrase 1 (CA-1), suggests it may be involved in the pathophysiology of depressive episodes in BD. Thus, BD pathophysiology may be associated with early perturbations in lipid metabolism that are independent of mood state, while CA-1 may be involved in the pathophysiology of depressive episodes.  相似文献   
78.
79.
80.
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