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   2519000篇
  免费   176060篇
  国内免费   3323篇
耳鼻咽喉   33262篇
儿科学   82572篇
妇产科学   65857篇
基础医学   365480篇
口腔科学   65212篇
临床医学   222911篇
内科学   487622篇
皮肤病学   52501篇
神经病学   200733篇
特种医学   96784篇
外国民族医学   489篇
外科学   383855篇
综合类   50124篇
现状与发展   12篇
一般理论   849篇
预防医学   199194篇
眼科学   56975篇
药学   184317篇
  10篇
中国医学   5203篇
肿瘤学   144421篇
  2021年   19138篇
  2019年   19693篇
  2018年   47475篇
  2017年   36639篇
  2016年   41845篇
  2015年   26657篇
  2014年   37011篇
  2013年   54807篇
  2012年   81291篇
  2011年   99111篇
  2010年   64130篇
  2009年   55579篇
  2008年   93436篇
  2007年   101165篇
  2006年   80952篇
  2005年   80217篇
  2004年   78432篇
  2003年   77164篇
  2002年   72848篇
  2001年   109163篇
  2000年   112173篇
  1999年   93806篇
  1998年   27262篇
  1997年   24007篇
  1996年   24220篇
  1995年   22900篇
  1994年   21083篇
  1993年   19877篇
  1992年   72159篇
  1991年   70271篇
  1990年   68590篇
  1989年   65829篇
  1988年   60441篇
  1987年   59264篇
  1986年   55337篇
  1985年   53153篇
  1984年   39393篇
  1983年   33482篇
  1982年   19961篇
  1979年   35978篇
  1978年   25716篇
  1977年   21261篇
  1976年   20403篇
  1975年   21836篇
  1974年   26201篇
  1973年   24831篇
  1972年   23219篇
  1971年   22050篇
  1970年   20287篇
  1969年   19360篇
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
91.
92.
93.
94.
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   
95.
96.
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   
97.
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   
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