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   3245393篇
  免费   244870篇
  国内免费   5672篇
耳鼻咽喉   44725篇
儿科学   106200篇
妇产科学   89713篇
基础医学   473636篇
口腔科学   89756篇
临床医学   295668篇
内科学   626590篇
皮肤病学   72983篇
神经病学   259957篇
特种医学   121650篇
外国民族医学   905篇
外科学   487496篇
综合类   72050篇
现状与发展   15篇
一般理论   1197篇
预防医学   256856篇
眼科学   75754篇
药学   238700篇
  10篇
中国医学   6859篇
肿瘤学   175215篇
  2021年   25742篇
  2019年   26573篇
  2018年   36889篇
  2017年   27779篇
  2016年   31370篇
  2015年   35231篇
  2014年   50038篇
  2013年   75066篇
  2012年   102806篇
  2011年   109780篇
  2010年   64994篇
  2009年   61548篇
  2008年   102224篇
  2007年   108719篇
  2006年   109900篇
  2005年   106673篇
  2004年   102237篇
  2003年   98050篇
  2002年   94706篇
  2001年   150345篇
  2000年   154098篇
  1999年   129231篇
  1998年   37784篇
  1997年   33437篇
  1996年   33493篇
  1995年   31630篇
  1994年   29187篇
  1993年   27413篇
  1992年   99446篇
  1991年   96566篇
  1990年   93875篇
  1989年   90431篇
  1988年   83282篇
  1987年   81299篇
  1986年   76229篇
  1985年   73161篇
  1984年   54930篇
  1983年   46673篇
  1982年   28112篇
  1979年   50098篇
  1978年   35577篇
  1977年   29636篇
  1976年   28263篇
  1975年   30009篇
  1974年   36239篇
  1973年   34535篇
  1972年   32541篇
  1971年   30476篇
  1970年   28354篇
  1969年   26811篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique.  相似文献   
84.
85.
86.
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   
87.
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   
88.
89.
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   
90.
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