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   2345682篇
  免费   175139篇
  国内免费   3311篇
耳鼻咽喉   32047篇
儿科学   75891篇
妇产科学   62708篇
基础医学   348191篇
口腔科学   63621篇
临床医学   211220篇
内科学   456719篇
皮肤病学   51770篇
神经病学   185306篇
特种医学   88066篇
外国民族医学   489篇
外科学   353976篇
综合类   47505篇
现状与发展   12篇
一般理论   848篇
预防医学   182544篇
眼科学   54346篇
药学   175103篇
  10篇
中国医学   4576篇
肿瘤学   129184篇
  2021年   19001篇
  2019年   19549篇
  2018年   27079篇
  2017年   20369篇
  2016年   22770篇
  2015年   25658篇
  2014年   36131篇
  2013年   53986篇
  2012年   74745篇
  2011年   79473篇
  2010年   47090篇
  2009年   44590篇
  2008年   74659篇
  2007年   79525篇
  2006年   80347篇
  2005年   77826篇
  2004年   74411篇
  2003年   71741篇
  2002年   69406篇
  2001年   108776篇
  2000年   111491篇
  1999年   93537篇
  1998年   27008篇
  1997年   23677篇
  1996年   24066篇
  1995年   22734篇
  1994年   20906篇
  1993年   19719篇
  1992年   72023篇
  1991年   70084篇
  1990年   68406篇
  1989年   65672篇
  1988年   60320篇
  1987年   59142篇
  1986年   55240篇
  1985年   53026篇
  1984年   39327篇
  1983年   33406篇
  1982年   19867篇
  1979年   35882篇
  1978年   25662篇
  1977年   21244篇
  1976年   20346篇
  1975年   21825篇
  1974年   26158篇
  1973年   24808篇
  1972年   23205篇
  1971年   22044篇
  1970年   20253篇
  1969年   19327篇
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
31.
MicroRNAs (miRNAs) play important roles in prostate cancer development. However, it remains unclear how individual miRNAs contribute to the initiation and progression of prostate cancer. Here we show that a basal layer‐enriched miRNA is required for prostate tumorigenesis. We identify miR‐205 as the most highly expressed miRNA and enriched in the basal cells of the prostate. Although miR‐205 is not required for normal prostate development and homeostasis, genetic deletion of miR‐205 in a Pten null tumor model significantly compromises tumor progression and does not promote metastasis. In Pten null basal cells, loss of miR‐205 attenuates pAkt levels and promotes cellular senescence. Furthermore, although overexpression of miR‐205 in prostate cancer cells with luminal phenotypes inhibits cell growth in both human and mouse, miR‐205 has a minimal effect on the growth of a normal human prostate cell line. Taken together, we have provided genetic evidence for a requirement of miR‐205 in the progression of Pten null‐induced prostate cancer.  相似文献   
32.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
33.
34.
35.
36.
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild...  相似文献   
37.
38.
39.
40.
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