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   2977607篇
  免费   223138篇
  国内免费   4899篇
耳鼻咽喉   42297篇
儿科学   94136篇
妇产科学   81222篇
基础医学   437949篇
口腔科学   84021篇
临床医学   268278篇
内科学   570598篇
皮肤病学   64892篇
神经病学   237974篇
特种医学   113544篇
外国民族医学   653篇
外科学   451745篇
综合类   66567篇
现状与发展   13篇
一般理论   1081篇
预防医学   233643篇
眼科学   70451篇
药学   222267篇
  11篇
中国医学   5854篇
肿瘤学   158448篇
  2018年   32724篇
  2017年   24966篇
  2016年   27978篇
  2015年   31324篇
  2014年   44233篇
  2013年   67073篇
  2012年   91788篇
  2011年   97729篇
  2010年   57670篇
  2009年   54007篇
  2008年   92106篇
  2007年   98447篇
  2006年   98825篇
  2005年   96200篇
  2004年   92500篇
  2003年   89338篇
  2002年   86370篇
  2001年   131376篇
  2000年   135007篇
  1999年   113349篇
  1998年   33507篇
  1997年   29642篇
  1996年   29660篇
  1995年   27983篇
  1994年   26023篇
  1993年   24519篇
  1992年   88935篇
  1991年   87072篇
  1990年   85141篇
  1989年   82043篇
  1988年   75834篇
  1987年   74371篇
  1986年   69889篇
  1985年   67351篇
  1984年   50825篇
  1983年   43338篇
  1982年   26292篇
  1981年   23819篇
  1979年   48029篇
  1978年   34444篇
  1977年   28748篇
  1976年   27383篇
  1975年   29503篇
  1974年   35742篇
  1973年   34077篇
  1972年   32119篇
  1971年   30211篇
  1970年   28157篇
  1969年   27077篇
  1968年   24677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