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   3209677篇
  免费   237803篇
  国内免费   4540篇
耳鼻咽喉   44089篇
儿科学   104615篇
妇产科学   87094篇
基础医学   473770篇
口腔科学   90156篇
临床医学   294947篇
内科学   617695篇
皮肤病学   70215篇
神经病学   256967篇
特种医学   119955篇
外国民族医学   733篇
外科学   472617篇
综合类   66685篇
现状与发展   14篇
一般理论   1352篇
预防医学   261282篇
眼科学   74824篇
药学   237599篇
  16篇
中国医学   5943篇
肿瘤学   171452篇
  2019年   26448篇
  2018年   36005篇
  2017年   27247篇
  2016年   30373篇
  2015年   34591篇
  2014年   48729篇
  2013年   73415篇
  2012年   100878篇
  2011年   107402篇
  2010年   63381篇
  2009年   60246篇
  2008年   100963篇
  2007年   107512篇
  2006年   107915篇
  2005年   104860篇
  2004年   100139篇
  2003年   96287篇
  2002年   93391篇
  2001年   141021篇
  2000年   144425篇
  1999年   122075篇
  1998年   36127篇
  1997年   31900篇
  1996年   32296篇
  1995年   30506篇
  1994年   28352篇
  1993年   26467篇
  1992年   95759篇
  1991年   93666篇
  1990年   91251篇
  1989年   88252篇
  1988年   81355篇
  1987年   79727篇
  1986年   75284篇
  1985年   72085篇
  1984年   54137篇
  1983年   46641篇
  1982年   27904篇
  1979年   50648篇
  1978年   36445篇
  1977年   30365篇
  1976年   28833篇
  1975年   31107篇
  1974年   37483篇
  1973年   36028篇
  1972年   33992篇
  1971年   32026篇
  1970年   29864篇
  1969年   28419篇
  1968年   26296篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Journal of Neuro-Oncology - Adjuvant radiation is often used in patients with low grade gliomas with high-risk characteristics with a recommended dose of 45–54 Gy. We used the...  相似文献   
33.
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   
34.
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   
35.
36.
37.
38.
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   
39.
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   
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