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   2417083篇
  免费   180636篇
  国内免费   3765篇
耳鼻咽喉   33042篇
儿科学   78085篇
妇产科学   64479篇
基础医学   358554篇
口腔科学   64553篇
临床医学   219727篇
内科学   470119篇
皮肤病学   53709篇
神经病学   191836篇
特种医学   90947篇
外国民族医学   527篇
外科学   361285篇
综合类   48166篇
现状与发展   13篇
一般理论   951篇
预防医学   189977篇
眼科学   55880篇
药学   180345篇
  10篇
中国医学   5040篇
肿瘤学   134239篇
  2021年   21077篇
  2019年   21471篇
  2018年   29262篇
  2017年   22067篇
  2016年   24961篇
  2015年   28225篇
  2014年   39361篇
  2013年   58205篇
  2012年   80565篇
  2011年   85278篇
  2010年   50497篇
  2009年   47406篇
  2008年   79091篇
  2007年   83887篇
  2006年   84307篇
  2005年   81615篇
  2004年   77704篇
  2003年   74660篇
  2002年   72086篇
  2001年   109512篇
  2000年   112137篇
  1999年   94177篇
  1998年   27567篇
  1997年   24101篇
  1996年   24440篇
  1995年   23118篇
  1994年   21225篇
  1993年   20049篇
  1992年   72449篇
  1991年   70549篇
  1990年   68799篇
  1989年   66104篇
  1988年   60721篇
  1987年   59492篇
  1986年   55598篇
  1985年   53371篇
  1984年   39650篇
  1983年   33659篇
  1982年   20112篇
  1979年   36102篇
  1978年   25850篇
  1977年   21394篇
  1976年   20468篇
  1975年   21955篇
  1974年   26321篇
  1973年   24973篇
  1972年   23360篇
  1971年   22127篇
  1970年   20364篇
  1969年   19415篇
排序方式: 共有10000条查询结果,搜索用时 343 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.
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