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   2377612篇
  免费   176723篇
  国内免费   3445篇
耳鼻咽喉   32460篇
儿科学   78052篇
妇产科学   63274篇
基础医学   351950篇
口腔科学   64564篇
临床医学   213513篇
内科学   462219篇
皮肤病学   52683篇
神经病学   187124篇
特种医学   88921篇
外国民族医学   489篇
外科学   358757篇
综合类   48576篇
现状与发展   12篇
一般理论   864篇
预防医学   184146篇
眼科学   55505篇
药学   178579篇
  10篇
中国医学   4886篇
肿瘤学   131196篇
  2021年   20423篇
  2019年   20416篇
  2018年   28243篇
  2017年   21237篇
  2016年   23948篇
  2015年   26808篇
  2014年   37851篇
  2013年   55921篇
  2012年   77416篇
  2011年   82113篇
  2010年   48647篇
  2009年   45802篇
  2008年   76357篇
  2007年   81195篇
  2006年   81905篇
  2005年   79173篇
  2004年   75656篇
  2003年   72767篇
  2002年   70296篇
  2001年   109203篇
  2000年   111858篇
  1999年   93862篇
  1998年   27189篇
  1997年   23822篇
  1996年   24220篇
  1995年   22853篇
  1994年   21006篇
  1993年   19801篇
  1992年   72197篇
  1991年   70278篇
  1990年   68619篇
  1989年   65884篇
  1988年   60485篇
  1987年   59295篇
  1986年   55380篇
  1985年   53158篇
  1984年   39426篇
  1983年   33485篇
  1982年   19903篇
  1979年   35948篇
  1978年   25710篇
  1977年   21296篇
  1976年   20383篇
  1975年   21856篇
  1974年   26189篇
  1973年   24848篇
  1972年   23244篇
  1971年   22093篇
  1970年   20290篇
  1969年   19342篇
排序方式: 共有10000条查询结果,搜索用时 62 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