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   2499182篇
  免费   178084篇
  国内免费   3796篇
耳鼻咽喉   34135篇
儿科学   81810篇
妇产科学   67276篇
基础医学   368001篇
口腔科学   68045篇
临床医学   223179篇
内科学   484286篇
皮肤病学   55195篇
神经病学   194658篇
特种医学   96817篇
外国民族医学   578篇
外科学   376954篇
综合类   48642篇
现状与发展   13篇
一般理论   859篇
预防医学   195297篇
眼科学   57762篇
药学   185926篇
  12篇
中国医学   4805篇
肿瘤学   136812篇
  2021年   19603篇
  2019年   19999篇
  2018年   30627篇
  2017年   24141篇
  2016年   25804篇
  2015年   30099篇
  2014年   40038篇
  2013年   57155篇
  2012年   83604篇
  2011年   83782篇
  2010年   49099篇
  2009年   47961篇
  2008年   76573篇
  2007年   81953篇
  2006年   83041篇
  2005年   87918篇
  2004年   87016篇
  2003年   79925篇
  2002年   72215篇
  2001年   111240篇
  2000年   112481篇
  1999年   96731篇
  1998年   27363篇
  1997年   23821篇
  1996年   24280篇
  1995年   22937篇
  1994年   21111篇
  1993年   19897篇
  1992年   76104篇
  1991年   74369篇
  1990年   72897篇
  1989年   69976篇
  1988年   64382篇
  1987年   63048篇
  1986年   59052篇
  1985年   56365篇
  1984年   41622篇
  1983年   35305篇
  1982年   20516篇
  1979年   38490篇
  1978年   27278篇
  1977年   22497篇
  1976年   21386篇
  1975年   23542篇
  1974年   28304篇
  1973年   26747篇
  1972年   25176篇
  1971年   24030篇
  1970年   22078篇
  1969年   21050篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
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   
34.
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   
35.
36.
37.
38.
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   
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