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   2423114篇
  免费   180722篇
  国内免费   3782篇
耳鼻咽喉   33066篇
儿科学   77766篇
妇产科学   63925篇
基础医学   358336篇
口腔科学   65712篇
临床医学   219009篇
内科学   473051篇
皮肤病学   53129篇
神经病学   192758篇
特种医学   91299篇
外国民族医学   506篇
外科学   366705篇
综合类   48132篇
现状与发展   12篇
一般理论   1034篇
预防医学   188134篇
眼科学   55818篇
药学   179883篇
  9篇
中国医学   4705篇
肿瘤学   134629篇
  2021年   21435篇
  2019年   21716篇
  2018年   29724篇
  2017年   22239篇
  2016年   24809篇
  2015年   27845篇
  2014年   39233篇
  2013年   58084篇
  2012年   80673篇
  2011年   85654篇
  2010年   50560篇
  2009年   47617篇
  2008年   79813篇
  2007年   84456篇
  2006年   85214篇
  2005年   82595篇
  2004年   78715篇
  2003年   75779篇
  2002年   73012篇
  2001年   109455篇
  2000年   112078篇
  1999年   94266篇
  1998年   27781篇
  1997年   24316篇
  1996年   24590篇
  1995年   23225篇
  1994年   21328篇
  1993年   20155篇
  1992年   72449篇
  1991年   70483篇
  1990年   68790篇
  1989年   66005篇
  1988年   60694篇
  1987年   59466篇
  1986年   55591篇
  1985年   53373篇
  1984年   39722篇
  1983年   33757篇
  1982年   20200篇
  1979年   36062篇
  1978年   25787篇
  1977年   21321篇
  1976年   20411篇
  1975年   21920篇
  1974年   26269篇
  1973年   24945篇
  1972年   23301篇
  1971年   22136篇
  1970年   20323篇
  1969年   19358篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
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   
32.
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.
Among the chief limitations in achieving early detection and control of animal‐origin influenza of pandemic potential in high‐risk livestock populations is the existing lag time between sample collection and diagnostic result. Advances in molecular diagnostics are permitting deployment of affordable, rapid, highly sensitive, and specific point‐of‐capture assays, providing opportunities for targeted surveillance driving containment strategies with potentially compelling returns on investment. Interrupting disease transmission at source holds promise of disrupting cycles of animal‐origin influenza incursion to endemicity and limiting impact on animal production, food security, and public health. Adoption of new point‐of‐capture diagnostics should be undertaken in the context of promoting robust veterinary services systems and parallel support for operationalizing pre‐authorized plans and communication strategies that will ensure that the full potential of these new platforms is realized.  相似文献   
38.
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   
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