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   2473272篇
  免费   183407篇
  国内免费   3819篇
耳鼻咽喉   33957篇
儿科学   79538篇
妇产科学   65318篇
基础医学   364993篇
口腔科学   66470篇
临床医学   224040篇
内科学   483074篇
皮肤病学   53704篇
神经病学   198270篇
特种医学   92308篇
外国民族医学   500篇
外科学   372431篇
综合类   49280篇
现状与发展   13篇
一般理论   1024篇
预防医学   192653篇
眼科学   57842篇
药学   183440篇
  11篇
中国医学   4736篇
肿瘤学   136896篇
  2021年   20958篇
  2019年   21439篇
  2018年   29452篇
  2017年   22049篇
  2016年   24771篇
  2015年   28061篇
  2014年   39642篇
  2013年   59675篇
  2012年   82532篇
  2011年   87951篇
  2010年   51943篇
  2009年   49049篇
  2008年   82703篇
  2007年   88237篇
  2006年   88643篇
  2005年   86321篇
  2004年   82456篇
  2003年   79531篇
  2002年   76894篇
  2001年   109849篇
  2000年   112229篇
  1999年   94630篇
  1998年   28631篇
  1997年   25082篇
  1996年   25303篇
  1995年   23872篇
  1994年   21955篇
  1993年   20729篇
  1992年   72773篇
  1991年   70771篇
  1990年   69015篇
  1989年   66270篇
  1988年   60899篇
  1987年   59667篇
  1986年   55854篇
  1985年   53711篇
  1984年   40232篇
  1983年   34305篇
  1982年   21108篇
  1979年   36506篇
  1978年   26380篇
  1977年   21862篇
  1976年   20904篇
  1975年   22262篇
  1974年   26616篇
  1973年   25187篇
  1972年   23483篇
  1971年   22260篇
  1970年   20428篇
  1969年   19486篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
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   
94.
95.
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   
96.
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   
97.
98.
99.
100.
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