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   2346783篇
  免费   175063篇
  国内免费   3320篇
耳鼻咽喉   32049篇
儿科学   75912篇
妇产科学   62691篇
基础医学   348214篇
口腔科学   63654篇
临床医学   211362篇
内科学   457336篇
皮肤病学   51731篇
神经病学   185324篇
特种医学   88016篇
外国民族医学   489篇
外科学   353929篇
综合类   47512篇
现状与发展   12篇
一般理论   848篇
预防医学   182741篇
眼科学   54326篇
药学   175140篇
  11篇
中国医学   4576篇
肿瘤学   129293篇
  2021年   19000篇
  2019年   19551篇
  2018年   27076篇
  2017年   20371篇
  2016年   22757篇
  2015年   25651篇
  2014年   36110篇
  2013年   53960篇
  2012年   74692篇
  2011年   79438篇
  2010年   47071篇
  2009年   44577篇
  2008年   74627篇
  2007年   79501篇
  2006年   80311篇
  2005年   77793篇
  2004年   74375篇
  2003年   71705篇
  2002年   69380篇
  2001年   108756篇
  2000年   111463篇
  1999年   93507篇
  1998年   26994篇
  1997年   23662篇
  1996年   24058篇
  1995年   22717篇
  1994年   20896篇
  1993年   19715篇
  1992年   72003篇
  1991年   70079篇
  1990年   68400篇
  1989年   65667篇
  1988年   60310篇
  1987年   59136篇
  1986年   55225篇
  1985年   53012篇
  1984年   39314篇
  1983年   33398篇
  1982年   19860篇
  1979年   35867篇
  1978年   25651篇
  1977年   21232篇
  1976年   20332篇
  1975年   21816篇
  1974年   26148篇
  1973年   24802篇
  1972年   23203篇
  1971年   22037篇
  1970年   20248篇
  1969年   19316篇
排序方式: 共有10000条查询结果,搜索用时 27 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