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   21622篇
  免费   1891篇
  国内免费   42篇
耳鼻咽喉   241篇
儿科学   662篇
妇产科学   391篇
基础医学   3035篇
口腔科学   322篇
临床医学   2283篇
内科学   4359篇
皮肤病学   313篇
神经病学   1932篇
特种医学   638篇
外国民族医学   3篇
外科学   2720篇
综合类   493篇
一般理论   15篇
预防医学   2261篇
眼科学   724篇
药学   1608篇
中国医学   22篇
肿瘤学   1533篇
  2022年   149篇
  2021年   322篇
  2020年   241篇
  2019年   363篇
  2018年   374篇
  2017年   284篇
  2016年   336篇
  2015年   401篇
  2014年   565篇
  2013年   828篇
  2012年   1238篇
  2011年   1322篇
  2010年   642篇
  2009年   672篇
  2008年   1105篇
  2007年   1252篇
  2006年   1192篇
  2005年   1208篇
  2004年   1174篇
  2003年   1004篇
  2002年   1006篇
  2001年   465篇
  2000年   488篇
  1999年   503篇
  1998年   301篇
  1997年   221篇
  1996年   232篇
  1995年   206篇
  1994年   177篇
  1993年   157篇
  1992年   331篇
  1991年   330篇
  1990年   315篇
  1989年   304篇
  1988年   286篇
  1987年   270篇
  1986年   296篇
  1985年   251篇
  1984年   216篇
  1983年   163篇
  1982年   158篇
  1981年   126篇
  1980年   127篇
  1979年   199篇
  1978年   148篇
  1977年   112篇
  1976年   106篇
  1975年   104篇
  1974年   128篇
  1973年   139篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
The authors present a case of rickets in an adolescent girl who presented to the emergency department with bone pain. Emergency department staff should be aware that rickets is not just a disease of early childhood.  相似文献   
5.
A national conference on organ donation after cardiac death (DCD) was convened to expand the practice of DCD in the continuum of quality end-of-life care. This national conference affirmed the ethical propriety of DCD as not violating the dead donor rule. Further, by new developments not previously reported, the conference resolved controversy regarding the period of circulatory cessation that determines death and allows administration of pre-recovery pharmacologic agents, it established conditions of DCD eligibility, it presented current data regarding the successful transplantation of organs from DCD, it proposed a new framework of data reporting regarding ischemic events, it made specific recommendations to agencies and organizations to remove barriers to DCD, it brought guidance regarding organ allocation and the process of informed consent and it set an action plan to address media issues. When a consensual decision is made to withdraw life support by the attending physician and patient or by the attending physician and a family member or surrogate (particularly in an intensive care unit), a routine opportunity for DCD should be available to honor the deceased donor's wishes in every donor service area (DSA) of the United States.  相似文献   
6.
7.
For many parents stopping life-sustaining medical treatment on their dying infant is psychologically impossible. Dostoevsky's insights into human behavior, particularly the fact that individuals do not want the anxiety and guilt associated with responsibility for making difficult decisions, might change the way physicians approach parents for permission to withdraw life-prolonging medical interventions on dying infants.  相似文献   
8.
AIMS: To establish all-cause and cause-specific death rates, and risk factors for mortality in insulin-treated diabetic individuals living in the province of Canterbury, New Zealand. METHODS: Insulin-treated diabetic subjects (n = 995) on the Canterbury Diabetes Registry were followed up over 15 years and vital status determined. Death rates were standardized and hazard regression was used to model the effects of demographic covariates on relative survival time. RESULTS: There were 419 deaths in 11 226.3 person-years of follow-up with a standardized mortality ratio (SMR) of 2.0 (95% confidence interval (CI) 1.8-2.2). Relative mortality was greatest for the group aged 0-29 years (SMR 3.0 (95% CI 2.4-3.7)). After controlling for diabetes duration and gender, a 10-year increment in age of onset was associated with a 33% decrease in relative hazard (95% CI 29-36%), indicating that excess mortality due to diabetes declines with rising age of onset. After controlling for age of onset and gender, each 10-year increment in duration of diabetes is associated with a 26% decrease in relative hazard (95% CI 24-29%), indicating that with longer survival the mortality hazard approaches the general population hazard. Relative mortalities were increased for cardiovascular, renal and respiratory disease, but not malignancy. Relative mortality from acute metabolic complications was increased in the subgroup with age of onset of diabetes < 30 years and requiring insulin within 1 year of diagnosis. CONCLUSIONS: Mortality rates are high for insulin-treated diabetic individuals relative to the general population.  相似文献   
9.
10.
. Neutrophil-mediated tissue damage has been implicated in the pathogenesis of diarrhoea-associated haemolytic uraemic syndrome (D+ HUS). This study evaluates priming and activation of the neutrophil oxidative burst in D+ HUS using chemiluminescent techniques. Peripheral blood neutrophils from 11 children with acute D+ HUS were examined. No difference was found in the oxidative burst of neutrophils from patients and controls. Serum elastase levels were measured in 8 patients and found to be significantly elevated. Although elastase results suggest neutrophil activation, chemiluminescence studies do not confirm this in the peripheral blood neutrophil. This does not support a significant role for circulating agents in priming and activating the peripheral blood neutrophil. Received August 17, 1995; received in revised form and accepted November 27, 1995  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