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   2546909篇
  免费   206903篇
  国内免费   5458篇
耳鼻咽喉   37324篇
儿科学   82605篇
妇产科学   66578篇
基础医学   360902篇
口腔科学   66865篇
临床医学   242281篇
内科学   510417篇
皮肤病学   59147篇
神经病学   204466篇
特种医学   95920篇
外国民族医学   492篇
外科学   399446篇
综合类   49052篇
现状与发展   85篇
一般理论   921篇
预防医学   195167篇
眼科学   59338篇
药学   181203篇
  10篇
中国医学   4694篇
肿瘤学   142357篇
  2021年   22599篇
  2019年   22376篇
  2018年   34486篇
  2017年   27360篇
  2016年   30587篇
  2015年   33767篇
  2014年   50692篇
  2013年   70149篇
  2012年   83729篇
  2011年   88744篇
  2010年   58363篇
  2009年   58635篇
  2008年   84061篇
  2007年   88019篇
  2006年   90632篇
  2005年   85947篇
  2004年   81884篇
  2003年   77988篇
  2002年   75784篇
  2001年   112683篇
  2000年   114651篇
  1999年   96909篇
  1998年   30948篇
  1997年   27339篇
  1996年   27430篇
  1995年   26049篇
  1994年   23097篇
  1993年   21577篇
  1992年   73759篇
  1991年   71822篇
  1990年   69837篇
  1989年   67145篇
  1988年   61682篇
  1987年   60375篇
  1986年   56503篇
  1985年   54174篇
  1984年   40449篇
  1983年   34509篇
  1982年   21089篇
  1979年   36567篇
  1978年   26424篇
  1977年   22133篇
  1976年   21020篇
  1975年   22476篇
  1974年   26699篇
  1973年   25362篇
  1972年   23754篇
  1971年   22413篇
  1970年   20686篇
  1969年   19561篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
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   
45.
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   
46.
47.
48.
49.
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   
50.
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