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   2394421篇
  免费   177786篇
  国内免费   3365篇
耳鼻咽喉   32820篇
儿科学   77352篇
妇产科学   63844篇
基础医学   355154篇
口腔科学   65550篇
临床医学   216026篇
内科学   465415篇
皮肤病学   52923篇
神经病学   190554篇
特种医学   90171篇
外国民族医学   489篇
外科学   360434篇
综合类   47680篇
现状与发展   12篇
一般理论   877篇
预防医学   186104篇
眼科学   55321篇
药学   178465篇
  11篇
中国医学   4652篇
肿瘤学   131718篇
  2021年   19443篇
  2019年   20092篇
  2018年   28138篇
  2017年   21304篇
  2016年   23957篇
  2015年   26558篇
  2014年   37203篇
  2013年   56094篇
  2012年   77305篇
  2011年   82445篇
  2010年   48615篇
  2009年   45595篇
  2008年   77548篇
  2007年   82547篇
  2006年   83083篇
  2005年   80559篇
  2004年   76987篇
  2003年   74414篇
  2002年   71976篇
  2001年   110288篇
  2000年   113422篇
  1999年   94686篇
  1998年   27436篇
  1997年   24044篇
  1996年   24342篇
  1995年   22972篇
  1994年   21174篇
  1993年   19958篇
  1992年   72315篇
  1991年   70330篇
  1990年   68623篇
  1989年   65940篇
  1988年   60522篇
  1987年   59358篇
  1986年   55442篇
  1985年   53272篇
  1984年   39626篇
  1983年   33634篇
  1982年   20086篇
  1979年   36089篇
  1978年   25823篇
  1977年   21413篇
  1976年   20501篇
  1975年   21961篇
  1974年   26273篇
  1973年   24958篇
  1972年   23290篇
  1971年   22121篇
  1970年   20337篇
  1969年   19407篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
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   
32.
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   
33.
34.
35.
36.
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   
37.
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   
38.
39.
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