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   1687122篇
  免费   121114篇
  国内免费   2410篇
耳鼻咽喉   23879篇
儿科学   57317篇
妇产科学   45091篇
基础医学   254246篇
口腔科学   43561篇
临床医学   149871篇
内科学   329463篇
皮肤病学   37447篇
神经病学   126796篇
特种医学   66550篇
外国民族医学   706篇
外科学   256537篇
综合类   33132篇
现状与发展   2篇
一般理论   471篇
预防医学   126549篇
眼科学   37660篇
药学   126654篇
  3篇
中国医学   3246篇
肿瘤学   91465篇
  2018年   17496篇
  2017年   13088篇
  2016年   14654篇
  2015年   16478篇
  2014年   22652篇
  2013年   34321篇
  2012年   47994篇
  2011年   51612篇
  2010年   30579篇
  2009年   28574篇
  2008年   48850篇
  2007年   52766篇
  2006年   52683篇
  2005年   51049篇
  2004年   49821篇
  2003年   48235篇
  2002年   47326篇
  2001年   79932篇
  2000年   82727篇
  1999年   69933篇
  1998年   19056篇
  1997年   17057篇
  1996年   17472篇
  1995年   16565篇
  1994年   15518篇
  1993年   14518篇
  1992年   55235篇
  1991年   55322篇
  1990年   54093篇
  1989年   51893篇
  1988年   47822篇
  1987年   47051篇
  1986年   43858篇
  1985年   42081篇
  1984年   31400篇
  1983年   26494篇
  1982年   15056篇
  1981年   13717篇
  1979年   28452篇
  1978年   19924篇
  1977年   16670篇
  1976年   16115篇
  1975年   18019篇
  1974年   20753篇
  1973年   19960篇
  1972年   18423篇
  1971年   17045篇
  1970年   16014篇
  1969年   14629篇
  1968年   13506篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
31.

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   
32.
33.
34.
35.
36.
37.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
38.
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   
39.
40.
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   
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