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   2552320篇
  免费   178146篇
  国内免费   3471篇
耳鼻咽喉   33630篇
儿科学   83247篇
妇产科学   66319篇
基础医学   369777篇
口腔科学   66113篇
临床医学   226381篇
内科学   494431篇
皮肤病学   53021篇
神经病学   204292篇
特种医学   98502篇
外国民族医学   495篇
外科学   388136篇
综合类   50504篇
现状与发展   12篇
一般理论   879篇
预防医学   202305篇
眼科学   57882篇
药学   186254篇
  11篇
中国医学   5252篇
肿瘤学   146494篇
  2021年   19580篇
  2019年   20144篇
  2018年   47962篇
  2017年   37068篇
  2016年   42294篇
  2015年   27299篇
  2014年   37908篇
  2013年   56184篇
  2012年   83200篇
  2011年   101110篇
  2010年   65282篇
  2009年   56651篇
  2008年   95348篇
  2007年   103236篇
  2006年   83114篇
  2005年   82257篇
  2004年   80386篇
  2003年   79079篇
  2002年   74698篇
  2001年   109552篇
  2000年   112494篇
  1999年   94183篇
  1998年   27698篇
  1997年   24333篇
  1996年   24522篇
  1995年   23184篇
  1994年   21300篇
  1993年   20061篇
  1992年   72350篇
  1991年   70474篇
  1990年   68740篇
  1989年   65997篇
  1988年   60597篇
  1987年   59425篇
  1986年   55487篇
  1985年   53327篇
  1984年   39601篇
  1983年   33683篇
  1982年   20190篇
  1979年   36128篇
  1978年   25885篇
  1977年   21400篇
  1976年   20536篇
  1975年   21966篇
  1974年   26320篇
  1973年   24921篇
  1972年   23309篇
  1971年   22122篇
  1970年   20353篇
  1969年   19414篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
23.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
24.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  相似文献   
25.
26.
27.
28.
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   
29.
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   
30.
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