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   2348790篇
  免费   175248篇
  国内免费   3340篇
耳鼻咽喉   32103篇
儿科学   75974篇
妇产科学   62842篇
基础医学   348463篇
口腔科学   63755篇
临床医学   211472篇
内科学   457311篇
皮肤病学   51824篇
神经病学   185408篇
特种医学   88164篇
外国民族医学   490篇
外科学   354407篇
综合类   47731篇
现状与发展   12篇
一般理论   849篇
预防医学   182890篇
眼科学   54378篇
药学   175387篇
  10篇
中国医学   4604篇
肿瘤学   129304篇
  2021年   19100篇
  2019年   19637篇
  2018年   27202篇
  2017年   20457篇
  2016年   22866篇
  2015年   25712篇
  2014年   36207篇
  2013年   54121篇
  2012年   74885篇
  2011年   79625篇
  2010年   47204篇
  2009年   44661篇
  2008年   74755篇
  2007年   79684篇
  2006年   80528篇
  2005年   77968篇
  2004年   74533篇
  2003年   71873篇
  2002年   69553篇
  2001年   108836篇
  2000年   111544篇
  1999年   93614篇
  1998年   27047篇
  1997年   23717篇
  1996年   24122篇
  1995年   22778篇
  1994年   20991篇
  1993年   19752篇
  1992年   72087篇
  1991年   70166篇
  1990年   68486篇
  1989年   65744篇
  1988年   60367篇
  1987年   59198篇
  1986年   55284篇
  1985年   53065篇
  1984年   39340篇
  1983年   33414篇
  1982年   19862篇
  1979年   35872篇
  1978年   25657篇
  1977年   21235篇
  1976年   20337篇
  1975年   21829篇
  1974年   26151篇
  1973年   24805篇
  1972年   23207篇
  1971年   22040篇
  1970年   20252篇
  1969年   19330篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
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   
93.
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   
94.
95.
96.
97.
98.
99.
100.
The present study aimed at measuring seropositivities for infection by Ascaris suum and Toxocara canis using the excretory/secretory (E/S) antigens from Ascaris suum (AES) and Toxocara canis (TES) within an indigenous population. In addition, quantification of cytokine expressions in peripheral blood cells was determined. A total of 50 Warao indigenous were included; of which 43 were adults and seven children. In adults, 44.1% were seropositive for both parasites; whereas children had only seropositivity to one or the other helminth. For ascariosis, the percentage of AES seropositivity in adults and children was high; 23.3% and 57.1%, respectively. While that for toxocariosis, the percentage of TES seropositivity in adults and children was low; 9.3% and 14.3%, respectively. The percentage of seronegativity was comparable for AES and TES antigens in adults (27.9%) and children (28.6%). When positive sera were analyzed by Western blotting technique using AES antigens; three bands of 97.2, 193.6 and 200.2 kDas were mostly recognized. When the TES antigens were used, nine major bands were mostly identified; 47.4, 52.2, 84.9, 98.2, 119.1, 131.3, 175.6, 184.4 and 193.6 kDas. Stool examinations showed that Blastocystis hominis, Hymenolepis nana and Entamoeba coli were the most commonly observed intestinal parasites. Quantification of cytokines IFN-γ, IL-2, IL-6, TGF-β, TNF-α, IL-10 and IL-4 expressions showed that there was only a significant increased expression of IL-4 in indigenous with TES seropositivity (p < 0.002). Ascaris and Toxocara seropositivity was prevalent among Warao indigenous.  相似文献   
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