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   2352066篇
  免费   175437篇
  国内免费   3327篇
耳鼻咽喉   32092篇
儿科学   76060篇
妇产科学   62849篇
基础医学   349158篇
口腔科学   63778篇
临床医学   212051篇
内科学   458355篇
皮肤病学   51862篇
神经病学   185759篇
特种医学   88273篇
外国民族医学   489篇
外科学   354597篇
综合类   47548篇
现状与发展   12篇
一般理论   850篇
预防医学   183205篇
眼科学   54377篇
药学   175425篇
  11篇
中国医学   4581篇
肿瘤学   129498篇
  2021年   19060篇
  2019年   19656篇
  2018年   27178篇
  2017年   20456篇
  2016年   22882篇
  2015年   25745篇
  2014年   36239篇
  2013年   54193篇
  2012年   74975篇
  2011年   79698篇
  2010年   47227篇
  2009年   44734篇
  2008年   74851篇
  2007年   79748篇
  2006年   80581篇
  2005年   78047篇
  2004年   74585篇
  2003年   71918篇
  2002年   69603篇
  2001年   108884篇
  2000年   111627篇
  1999年   93660篇
  1998年   27070篇
  1997年   23723篇
  1996年   24112篇
  1995年   22762篇
  1994年   20939篇
  1993年   19747篇
  1992年   72115篇
  1991年   70163篇
  1990年   68482篇
  1989年   65762篇
  1988年   60389篇
  1987年   59217篇
  1986年   55295篇
  1985年   53089篇
  1984年   39388篇
  1983年   33446篇
  1982年   19893篇
  1979年   35918篇
  1978年   25681篇
  1977年   21270篇
  1976年   20345篇
  1975年   21844篇
  1974年   26184篇
  1973年   24831篇
  1972年   23220篇
  1971年   22068篇
  1970年   20271篇
  1969年   19337篇
排序方式: 共有10000条查询结果,搜索用时 15 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