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   2346236篇
  免费   175202篇
  国内免费   3314篇
耳鼻咽喉   32058篇
儿科学   75951篇
妇产科学   62733篇
基础医学   348340篇
口腔科学   63659篇
临床医学   211255篇
内科学   456845篇
皮肤病学   51758篇
神经病学   185299篇
特种医学   88147篇
外国民族医学   489篇
外科学   354108篇
综合类   47458篇
现状与发展   12篇
一般理论   851篇
预防医学   182622篇
眼科学   54253篇
药学   175144篇
  9篇
中国医学   4580篇
肿瘤学   129181篇
  2021年   19020篇
  2019年   19580篇
  2018年   27100篇
  2017年   20398篇
  2016年   22794篇
  2015年   25684篇
  2014年   36157篇
  2013年   54053篇
  2012年   74823篇
  2011年   79565篇
  2010年   47159篇
  2009年   44663篇
  2008年   74754篇
  2007年   79646篇
  2006年   80456篇
  2005年   77928篇
  2004年   74494篇
  2003年   71824篇
  2002年   69488篇
  2001年   108800篇
  2000年   111496篇
  1999年   93532篇
  1998年   27016篇
  1997年   23685篇
  1996年   24092篇
  1995年   22734篇
  1994年   20913篇
  1993年   19737篇
  1992年   72030篇
  1991年   70094篇
  1990年   68434篇
  1989年   65689篇
  1988年   60331篇
  1987年   59153篇
  1986年   55235篇
  1985年   53031篇
  1984年   39330篇
  1983年   33410篇
  1982年   19873篇
  1979年   35885篇
  1978年   25664篇
  1977年   21244篇
  1976年   20340篇
  1975年   21827篇
  1974年   26163篇
  1973年   24808篇
  1972年   23204篇
  1971年   22043篇
  1970年   20254篇
  1969年   19326篇
排序方式: 共有10000条查询结果,搜索用时 15 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