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   2911359篇
  免费   213351篇
  国内免费   4852篇
耳鼻咽喉   40941篇
儿科学   94092篇
妇产科学   80105篇
基础医学   426324篇
口腔科学   80508篇
临床医学   260232篇
内科学   564275篇
皮肤病学   63893篇
神经病学   230642篇
特种医学   110689篇
外国民族医学   801篇
外科学   443040篇
综合类   61549篇
现状与发展   12篇
一般理论   1053篇
预防医学   225316篇
眼科学   68215篇
药学   215829篇
  9篇
中国医学   5743篇
肿瘤学   156294篇
  2019年   23215篇
  2018年   32129篇
  2017年   24412篇
  2016年   27143篇
  2015年   30642篇
  2014年   43442篇
  2013年   65567篇
  2012年   89910篇
  2011年   95747篇
  2010年   57122篇
  2009年   54026篇
  2008年   90310篇
  2007年   96049篇
  2006年   97184篇
  2005年   94387篇
  2004年   90292篇
  2003年   87084篇
  2002年   84821篇
  2001年   131542篇
  2000年   134997篇
  1999年   113987篇
  1998年   33045篇
  1997年   29298篇
  1996年   29475篇
  1995年   27690篇
  1994年   25654篇
  1993年   24219篇
  1992年   88750篇
  1991年   86151篇
  1990年   84378篇
  1989年   81251篇
  1988年   74896篇
  1987年   73644篇
  1986年   69347篇
  1985年   66407篇
  1984年   49632篇
  1983年   42327篇
  1982年   25302篇
  1979年   45821篇
  1978年   32649篇
  1977年   27229篇
  1976年   25982篇
  1975年   28101篇
  1974年   33867篇
  1973年   32356篇
  1972年   30341篇
  1971年   28559篇
  1970年   26628篇
  1969年   25227篇
  1968年   23414篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
112.
Objectives:To report if the association of epilepsy in pediatric patients (below the age of 15 years) with Insulin-dependent Diabetes (IDDM) at King Fahad Medical City (KFMC) is higher than the prevalence of epilepsy in the same age group (who have no IDDM) in our community. Consequently, we would determine if there is a relationship between the presence of epilepsy in diabetic children and the presence of positive antiGAD65 antibodies.Methods:This cohort study included 305 pediatric patients below the age of 15 years with Insulin-dependent Diabetes Mellitus (IDDM). They were randomly recruited at the Pediatric Endocrinology Clinic in KFMC. The patients’ caregivers were given a questionnaire between December 2015 till March 2019 to determine the seizure disorder history. There was also a retrospective review of 214 patients’ files for anti-GAD 65 positivity.Results:Our study found a significant relation between the presence of epilepsy in children with IDDM. Therefore, we could confirm the relationship between the existence of epilepsy in children with IDDM and having positive GAD65 antibodies.Conclusion:Our study supports the presence of consistent relation between having IDDM and having epilepsy in children and between the latter and the presence of positive GAD65 antibodies.

Insulin dependent diabetes Mellitus (IDDM) is a common condition in children and adolescents worldwide and so is epilepsy.1,2 Recently, there were increasing reports suggesting a potential association between having IDDM and the occurrence of epilepsy.3 Their association might represent simply a chance to relate their underlying mechanisms. However, the cause-effect relationship is not fully well defined. Literature from other countries have shown the increased prevalence of seizure disorders in this group of patients.4,5 There are scarce studies in the literature investigating IDDM characteristics contributing to having epilepsy, including positive GAD 65 antibodies. In this study that ran in King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia (KSA) we are aiming to determine if the prevalence of epilepsy among 1DDM children under the age of 15 years (in our center) is higher than controls (same age without IDDM), and to check the positivity of anti-GAD 65 amongst those patients in order to find if there is a relationship between epilepsy in children with diabetes and the presence of positive GAD65 Antibodies.  相似文献   
113.
114.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
115.
116.
BackgroundSecond-hand smoking or environmental tobacco smoke is a critical health risk. Children are the most vulnerable to second-hand smoking because of their small bronchial ducts, less developed immunity, and low-physical activity.ObjectivesThe purpose of this study was to ascertain the effects of second-hand smoking on lung functions in athlete and non-athlete school-aged children.MethodsThis observational study included forty-six school-aged children, their age was 8–15 years, assigned to three groups; 2 study groups and 1 control group (n=15). The study groups comprised of 16 football players, and of 15 cyclists. Lung functions were evaluated recording forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow using digital spirometer.ResultsAll measures were recorded in definite values and the children were also classified into second-hand smoking (SH), or non-exposed to tobacco smoking (NE). The findings presented a significant increase (p<0.05) of the study groups in forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow solely for the non-exposed children. However, there were non-significant differences between the cyclists and football players or between the passive smoking children and non-exposed children in any of the two study groups (p>0.05).ConclusionThe outcomes of this study suggest beneficial influences of the sports activity on the lung functions, without different influences of the cyclists and football players on the lung functions.  相似文献   
117.
118.
119.
120.
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