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   2358221篇
  免费   176398篇
  国内免费   3339篇
耳鼻咽喉   32173篇
儿科学   76246篇
妇产科学   62994篇
基础医学   349880篇
口腔科学   64027篇
临床医学   212703篇
内科学   459411篇
皮肤病学   51914篇
神经病学   186374篇
特种医学   88583篇
外国民族医学   489篇
外科学   355490篇
综合类   47613篇
现状与发展   12篇
一般理论   857篇
预防医学   183969篇
眼科学   54441篇
药学   176084篇
  11篇
中国医学   4588篇
肿瘤学   130099篇
  2021年   19127篇
  2019年   19753篇
  2018年   27386篇
  2017年   20672篇
  2016年   23052篇
  2015年   25897篇
  2014年   36397篇
  2013年   54553篇
  2012年   75432篇
  2011年   80198篇
  2010年   47451篇
  2009年   44840篇
  2008年   75353篇
  2007年   80309篇
  2006年   80994篇
  2005年   78452篇
  2004年   74986篇
  2003年   72351篇
  2002年   69956篇
  2001年   108993篇
  2000年   111758篇
  1999年   93726篇
  1998年   27108篇
  1997年   23764篇
  1996年   24179篇
  1995年   22841篇
  1994年   21022篇
  1993年   19803篇
  1992年   72132篇
  1991年   70179篇
  1990年   68514篇
  1989年   65793篇
  1988年   60406篇
  1987年   59224篇
  1986年   55335篇
  1985年   53106篇
  1984年   39424篇
  1983年   33483篇
  1982年   19925篇
  1979年   35937篇
  1978年   25703篇
  1977年   21282篇
  1976年   20372篇
  1975年   21877篇
  1974年   26190篇
  1973年   24848篇
  1972年   23219篇
  1971年   22079篇
  1970年   20284篇
  1969年   19329篇
排序方式: 共有10000条查询结果,搜索用时 272 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