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   1350962篇
  免费   96915篇
  国内免费   3042篇
耳鼻咽喉   19857篇
儿科学   40597篇
妇产科学   39014篇
基础医学   188975篇
口腔科学   40310篇
临床医学   114391篇
内科学   266227篇
皮肤病学   30410篇
神经病学   108067篇
特种医学   54165篇
外国民族医学   435篇
外科学   210589篇
综合类   31104篇
现状与发展   7篇
一般理论   448篇
预防医学   93234篇
眼科学   31689篇
药学   101162篇
  3篇
中国医学   3046篇
肿瘤学   77189篇
  2018年   12274篇
  2016年   10983篇
  2015年   12368篇
  2014年   17406篇
  2013年   26132篇
  2012年   34285篇
  2011年   36247篇
  2010年   21448篇
  2009年   20884篇
  2008年   34784篇
  2007年   37873篇
  2006年   38313篇
  2005年   37066篇
  2004年   36073篇
  2003年   34947篇
  2002年   34384篇
  2001年   63742篇
  2000年   65426篇
  1999年   55514篇
  1998年   14796篇
  1997年   13575篇
  1996年   13041篇
  1995年   12321篇
  1994年   11549篇
  1992年   42822篇
  1991年   41332篇
  1990年   40616篇
  1989年   39614篇
  1988年   37010篇
  1987年   36454篇
  1986年   34946篇
  1985年   33146篇
  1984年   24855篇
  1983年   21089篇
  1982年   12698篇
  1981年   11598篇
  1979年   23949篇
  1978年   17082篇
  1977年   14850篇
  1976年   13398篇
  1975年   15277篇
  1974年   18095篇
  1973年   17574篇
  1972年   16819篇
  1971年   15721篇
  1970年   14921篇
  1969年   14349篇
  1968年   13466篇
  1967年   12024篇
  1966年   11264篇
排序方式: 共有10000条查询结果,搜索用时 15 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