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   2622065篇
  免费   191754篇
  国内免费   5967篇
耳鼻咽喉   36144篇
儿科学   81506篇
妇产科学   70275篇
基础医学   386022篇
口腔科学   73039篇
临床医学   233709篇
内科学   511459篇
皮肤病学   57882篇
神经病学   204893篇
特种医学   98197篇
外国民族医学   559篇
外科学   398682篇
综合类   55959篇
现状与发展   13篇
一般理论   891篇
预防医学   194987篇
眼科学   61565篇
药学   198479篇
  11篇
中国医学   6479篇
肿瘤学   149035篇
  2021年   20684篇
  2019年   21351篇
  2018年   30111篇
  2017年   22732篇
  2016年   25182篇
  2015年   28433篇
  2014年   40088篇
  2013年   59092篇
  2012年   81527篇
  2011年   86448篇
  2010年   51391篇
  2009年   48653篇
  2008年   81127篇
  2007年   86698篇
  2006年   87324篇
  2005年   84258篇
  2004年   80450篇
  2003年   77603篇
  2002年   75126篇
  2001年   128605篇
  2000年   131771篇
  1999年   110395篇
  1998年   30922篇
  1997年   26815篇
  1996年   26697篇
  1995年   25100篇
  1994年   23079篇
  1993年   21697篇
  1992年   83777篇
  1991年   81106篇
  1990年   78976篇
  1989年   76290篇
  1988年   69941篇
  1987年   68446篇
  1986年   63854篇
  1985年   61059篇
  1984年   44672篇
  1983年   37720篇
  1982年   21953篇
  1979年   40194篇
  1978年   28239篇
  1977年   23613篇
  1976年   22132篇
  1975年   23965篇
  1974年   28657篇
  1973年   27148篇
  1972年   25514篇
  1971年   24318篇
  1970年   22369篇
  1969年   21451篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
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   
102.
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   
103.
104.
105.
106.
107.
108.
109.
110.
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