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   1334664篇
  免费   95982篇
  国内免费   2904篇
耳鼻咽喉   19722篇
儿科学   40252篇
妇产科学   38667篇
基础医学   187281篇
口腔科学   39824篇
临床医学   112689篇
内科学   262446篇
皮肤病学   30209篇
神经病学   106375篇
特种医学   53689篇
外国民族医学   435篇
外科学   208323篇
综合类   31044篇
现状与发展   6篇
一般理论   436篇
预防医学   92067篇
眼科学   31357篇
药学   100075篇
  4篇
中国医学   2988篇
肿瘤学   75661篇
  2018年   11749篇
  2015年   11879篇
  2014年   16695篇
  2013年   25271篇
  2012年   33019篇
  2011年   34881篇
  2010年   20741篇
  2009年   20233篇
  2008年   33591篇
  2007年   36700篇
  2006年   37271篇
  2005年   36028篇
  2004年   35101篇
  2003年   34084篇
  2002年   33603篇
  2001年   63630篇
  2000年   65329篇
  1999年   55399篇
  1998年   14661篇
  1997年   13467篇
  1996年   12944篇
  1995年   12226篇
  1994年   11473篇
  1992年   42774篇
  1991年   41287篇
  1990年   40561篇
  1989年   39559篇
  1988年   36977篇
  1987年   36420篇
  1986年   34910篇
  1985年   33110篇
  1984年   24831篇
  1983年   21062篇
  1982年   12670篇
  1981年   11573篇
  1980年   10774篇
  1979年   23930篇
  1978年   17069篇
  1977年   14836篇
  1976年   13386篇
  1975年   15269篇
  1974年   18083篇
  1973年   17565篇
  1972年   16816篇
  1971年   15717篇
  1970年   14916篇
  1969年   14347篇
  1968年   13460篇
  1967年   12018篇
  1966年   11259篇
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
21.

Background and objectives

A prompt and effective management of trauma patient is necessary. The aim of this case report is to highlight the importance of intraoperative echocardiography as a useful tool in patients suffering from refractory hemodynamic instability no otherwise explained.

Case report

A 41 year‐old woman suffered a car accident. At the emergency department, no abnormalities were found in ECG or chest X‐ray. Abdominal ultrasound revealed the presence of abdominal free liquid and the patient was submitted to urgent exploratory laparotomy. Nevertheless, she persisted suffering arterial hypotension and metabolic acidosis. Looking for the reason of her hemodynamic instability, intraoperative transthoracic echocardiography was performed, finding out the presence of pericardial effusion. Once the cardiac surgeon extracted pericardial clots, patient's situation improved clinically and analytically.

Conclusion

Every anesthesiologist should be able to use the intraoperative echocardiography as an effective tool in order to establish the appropriate measures to promote the survival of patients suffering severe trauma.  相似文献   
22.
23.
24.
25.
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   
26.
27.
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   
28.
29.
30.
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