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   2989939篇
  免费   212335篇
  国内免费   8125篇
耳鼻咽喉   40154篇
儿科学   97920篇
妇产科学   82209篇
基础医学   428186篇
口腔科学   82968篇
临床医学   268421篇
内科学   588127篇
皮肤病学   72390篇
神经病学   242961篇
特种医学   113004篇
外国民族医学   779篇
外科学   443514篇
综合类   56486篇
现状与发展   5篇
一般理论   1069篇
预防医学   233921篇
眼科学   67523篇
药学   220260篇
  8篇
中国医学   6260篇
肿瘤学   164234篇
  2021年   23578篇
  2019年   24524篇
  2018年   35120篇
  2017年   26536篇
  2016年   30392篇
  2015年   34102篇
  2014年   46330篇
  2013年   69567篇
  2012年   93841篇
  2011年   99562篇
  2010年   59249篇
  2009年   55973篇
  2008年   92133篇
  2007年   98099篇
  2006年   99522篇
  2005年   95229篇
  2004年   91676篇
  2003年   88098篇
  2002年   85192篇
  2001年   141979篇
  2000年   145861篇
  1999年   122509篇
  1998年   34788篇
  1997年   30710篇
  1996年   31172篇
  1995年   30127篇
  1994年   27628篇
  1993年   25859篇
  1992年   94897篇
  1991年   91861篇
  1990年   89287篇
  1989年   86204篇
  1988年   78935篇
  1987年   77519篇
  1986年   72491篇
  1985年   69278篇
  1984年   51505篇
  1983年   43583篇
  1982年   25618篇
  1979年   45935篇
  1978年   32489篇
  1977年   27738篇
  1976年   25696篇
  1975年   27751篇
  1974年   32929篇
  1973年   31197篇
  1972年   29466篇
  1971年   27470篇
  1970年   25394篇
  1969年   24421篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
121.
122.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
123.
124.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
125.
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   
126.
127.
128.
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   
129.
130.
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