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   2399075篇
  免费   178595篇
  国内免费   5112篇
耳鼻咽喉   32579篇
儿科学   77052篇
妇产科学   63652篇
基础医学   355720篇
口腔科学   64272篇
临床医学   217207篇
内科学   467920篇
皮肤病学   52597篇
神经病学   189343篇
特种医学   89563篇
外国民族医学   528篇
外科学   360166篇
综合类   50949篇
现状与发展   18篇
一般理论   856篇
预防医学   186389篇
眼科学   55336篇
药学   179516篇
  24篇
中国医学   5630篇
肿瘤学   133465篇
  2021年   20440篇
  2019年   20663篇
  2018年   28717篇
  2017年   21652篇
  2016年   23983篇
  2015年   27347篇
  2014年   38098篇
  2013年   56170篇
  2012年   78494篇
  2011年   83229篇
  2010年   49079篇
  2009年   46181篇
  2008年   77750篇
  2007年   82621篇
  2006年   83303篇
  2005年   81008篇
  2004年   77006篇
  2003年   74187篇
  2002年   71723篇
  2001年   109828篇
  2000年   112713篇
  1999年   94661篇
  1998年   27551篇
  1997年   24188篇
  1996年   24482篇
  1995年   23136篇
  1994年   21229篇
  1993年   19970篇
  1992年   72584篇
  1991年   70568篇
  1990年   68898篇
  1989年   66155篇
  1988年   60736篇
  1987年   59547篇
  1986年   55548篇
  1985年   53336篇
  1984年   39529篇
  1983年   33565篇
  1982年   19954篇
  1979年   35980篇
  1978年   25726篇
  1977年   21298篇
  1976年   20397篇
  1975年   21870篇
  1974年   26245篇
  1973年   24882篇
  1972年   23284篇
  1971年   22127篇
  1970年   20332篇
  1969年   19412篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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   
33.
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   
34.
35.
36.
37.
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   
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