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   2465004篇
  免费   179737篇
  国内免费   3623篇
耳鼻咽喉   33597篇
儿科学   79011篇
妇产科学   65564篇
基础医学   365385篇
口腔科学   68057篇
临床医学   218434篇
内科学   482222篇
皮肤病学   55009篇
神经病学   195088篇
特种医学   90782篇
外国民族医学   490篇
外科学   366669篇
综合类   48059篇
现状与发展   12篇
一般理论   868篇
预防医学   197919篇
眼科学   57694篇
药学   184567篇
  11篇
中国医学   5012篇
肿瘤学   133914篇
  2021年   20930篇
  2019年   21777篇
  2018年   30904篇
  2017年   22800篇
  2016年   25123篇
  2015年   28275篇
  2014年   39035篇
  2013年   58439篇
  2012年   82623篇
  2011年   87708篇
  2010年   51139篇
  2009年   47500篇
  2008年   81175篇
  2007年   86562篇
  2006年   87034篇
  2005年   84137篇
  2004年   80238篇
  2003年   77037篇
  2002年   74471篇
  2001年   111065篇
  2000年   113994篇
  1999年   95479篇
  1998年   27424篇
  1997年   23929篇
  1996年   24320篇
  1995年   22946篇
  1994年   21092篇
  1993年   19879篇
  1992年   73217篇
  1991年   71222篇
  1990年   69568篇
  1989年   66718篇
  1988年   61339篇
  1987年   60082篇
  1986年   56209篇
  1985年   53935篇
  1984年   40010篇
  1983年   34007篇
  1982年   20188篇
  1979年   36774篇
  1978年   26249篇
  1977年   21800篇
  1976年   20903篇
  1975年   22471篇
  1974年   26986篇
  1973年   25704篇
  1972年   24053篇
  1971年   22878篇
  1970年   21047篇
  1969年   20175篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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   
33.
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.
39.
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   
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