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   2168894篇
  免费   157209篇
  国内免费   3200篇
耳鼻咽喉   31345篇
儿科学   72318篇
妇产科学   59038篇
基础医学   307898篇
口腔科学   59443篇
临床医学   191385篇
内科学   423265篇
皮肤病学   48681篇
神经病学   167947篇
特种医学   86566篇
外国民族医学   859篇
外科学   331914篇
综合类   44971篇
现状与发展   2篇
一般理论   619篇
预防医学   158615篇
眼科学   48934篇
药学   166760篇
  9篇
中国医学   4686篇
肿瘤学   124048篇
  2018年   22449篇
  2017年   17250篇
  2016年   19131篇
  2015年   21496篇
  2014年   29685篇
  2013年   44667篇
  2012年   61221篇
  2011年   64785篇
  2010年   38601篇
  2009年   36391篇
  2008年   61149篇
  2007年   65450篇
  2006年   66302篇
  2005年   64077篇
  2004年   62162篇
  2003年   60091篇
  2002年   58547篇
  2001年   111639篇
  2000年   115593篇
  1999年   97328篇
  1998年   25331篇
  1997年   22682篇
  1996年   23019篇
  1995年   21699篇
  1994年   20199篇
  1993年   18890篇
  1992年   75350篇
  1991年   72946篇
  1990年   71470篇
  1989年   68419篇
  1988年   62498篇
  1987年   61142篇
  1986年   57198篇
  1985年   54490篇
  1984年   40137篇
  1983年   33770篇
  1982年   19047篇
  1981年   17094篇
  1979年   35805篇
  1978年   24474篇
  1977年   21259篇
  1976年   19189篇
  1975年   21274篇
  1974年   24771篇
  1973年   23854篇
  1972年   22369篇
  1971年   20605篇
  1970年   19277篇
  1969年   18073篇
  1968年   16211篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.

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   
43.
44.
45.
46.
47.
48.
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   
49.
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   
50.
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