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   2409828篇
  免费   179100篇
  国内免费   4003篇
耳鼻咽喉   32824篇
儿科学   77839篇
妇产科学   64299篇
基础医学   356629篇
口腔科学   65125篇
临床医学   216797篇
内科学   470939篇
皮肤病学   53073篇
神经病学   191187篇
特种医学   90246篇
外国民族医学   506篇
外科学   362714篇
综合类   48983篇
现状与发展   12篇
一般理论   884篇
预防医学   186621篇
眼科学   55348篇
药学   180183篇
  13篇
中国医学   5010篇
肿瘤学   133699篇
  2021年   20354篇
  2019年   20737篇
  2018年   28502篇
  2017年   21494篇
  2016年   23986篇
  2015年   27065篇
  2014年   37977篇
  2013年   56615篇
  2012年   78235篇
  2011年   83144篇
  2010年   49489篇
  2009年   46683篇
  2008年   77814篇
  2007年   82838篇
  2006年   83392篇
  2005年   80752篇
  2004年   77606篇
  2003年   74836篇
  2002年   72474篇
  2001年   110664篇
  2000年   113228篇
  1999年   94950篇
  1998年   27720篇
  1997年   24224篇
  1996年   24540篇
  1995年   23172篇
  1994年   21304篇
  1993年   20090篇
  1992年   72895篇
  1991年   70986篇
  1990年   69151篇
  1989年   66451篇
  1988年   60981篇
  1987年   59782篇
  1986年   55869篇
  1985年   53597篇
  1984年   39748篇
  1983年   33815篇
  1982年   20141篇
  1979年   36213篇
  1978年   25899篇
  1977年   21453篇
  1976年   20557篇
  1975年   22112篇
  1974年   26473篇
  1973年   25105篇
  1972年   23481篇
  1971年   22297篇
  1970年   20474篇
  1969年   19547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