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   2430678篇
  免费   175973篇
  国内免费   3430篇
耳鼻咽喉   32661篇
儿科学   78850篇
妇产科学   64237篇
基础医学   357454篇
口腔科学   64484篇
临床医学   216641篇
内科学   475469篇
皮肤病学   52288篇
神经病学   193768篇
特种医学   91958篇
外国民族医学   492篇
外科学   368550篇
综合类   48167篇
现状与发展   12篇
一般理论   849篇
预防医学   189593篇
眼科学   55197篇
药学   179208篇
  10篇
中国医学   4598篇
肿瘤学   135595篇
  2021年   19358篇
  2019年   19820篇
  2018年   35661篇
  2017年   27328篇
  2016年   31162篇
  2015年   26278篇
  2014年   36838篇
  2013年   54809篇
  2012年   77980篇
  2011年   87783篇
  2010年   53589篇
  2009年   49542篇
  2008年   83134篇
  2007年   89875篇
  2006年   81340篇
  2005年   80191篇
  2004年   77237篇
  2003年   75439篇
  2002年   72113篇
  2001年   109054篇
  2000年   111953篇
  1999年   93752篇
  1998年   27296篇
  1997年   23984篇
  1996年   24292篇
  1995年   22937篇
  1994年   21134篇
  1993年   19909篇
  1992年   72170篇
  1991年   70246篇
  1990年   68554篇
  1989年   65796篇
  1988年   60415篇
  1987年   59244篇
  1986年   55337篇
  1985年   53132篇
  1984年   39397篇
  1983年   33478篇
  1982年   19969篇
  1979年   35982篇
  1978年   25711篇
  1977年   21253篇
  1976年   20401篇
  1975年   21824篇
  1974年   26179篇
  1973年   24812篇
  1972年   23206篇
  1971年   22040篇
  1970年   20277篇
  1969年   19347篇
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
91.
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   
92.
93.
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   
94.
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   
95.
96.
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