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   2516221篇
  免费   187583篇
  国内免费   3840篇
耳鼻咽喉   34046篇
儿科学   80568篇
妇产科学   66216篇
基础医学   370417篇
口腔科学   67404篇
临床医学   228091篇
内科学   491752篇
皮肤病学   54401篇
神经病学   202100篇
特种医学   93499篇
外国民族医学   504篇
外科学   379949篇
综合类   50353篇
现状与发展   14篇
一般理论   1092篇
预防医学   198997篇
眼科学   57924篇
药学   186901篇
  12篇
中国医学   4836篇
肿瘤学   138568篇
  2021年   21583篇
  2019年   22016篇
  2018年   30320篇
  2017年   22985篇
  2016年   25560篇
  2015年   28979篇
  2014年   40728篇
  2013年   61065篇
  2012年   84963篇
  2011年   90790篇
  2010年   53484篇
  2009年   50292篇
  2008年   85419篇
  2007年   90895篇
  2006年   91332篇
  2005年   89162篇
  2004年   85277篇
  2003年   81911篇
  2002年   79250篇
  2001年   110483篇
  2000年   112837篇
  1999年   95370篇
  1998年   29135篇
  1997年   25543篇
  1996年   25764篇
  1995年   24238篇
  1994年   22311篇
  1993年   21038篇
  1992年   73062篇
  1991年   71154篇
  1990年   69359篇
  1989年   66510篇
  1988年   61219篇
  1987年   60033篇
  1986年   56149篇
  1985年   53981篇
  1984年   40521篇
  1983年   34641篇
  1982年   21278篇
  1979年   36593篇
  1978年   26454篇
  1977年   22010篇
  1976年   21058篇
  1975年   22462篇
  1974年   26796篇
  1973年   25376篇
  1972年   23624篇
  1971年   22385篇
  1970年   20584篇
  1969年   19582篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
32.
33.
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   
34.
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   
35.
36.
Introduction: Pharmacovigilance is essential to monitoring the safety profiles of authorized medicines. Compared with small-molecule drugs, biological drugs are more complex, more susceptible to structural variability due to manufacturing processes, and have the potential to induce immune-related reactions, underscoring the importance of safety monitoring for these products. Although highly similar to reference products, biosimilars are not expected to be structurally identical. For these reasons, proper reporting of potential adverse drug reactions (ADRs) using distinguishable names and batch numbers is essential for accurate tracing of all biological drugs. To address the need for robust pharmacovigilance, the European Parliament and Council of the European Union provided legislation regarding pharmacovigilance of biologics in 2010.

Areas covered: This narrative review examines the current state of pharmacovigilance for biologics in the European Union (EU) and discusses relevant information on pharmacovigilance of biosimilars, the current EU pharmacovigilance system, and areas that could be improved.

Expert opinion: Although steps have been taken to improve pharmacovigilance of biologics in the EU, several enhancements can still be made, including additional training for healthcare professionals on ADR reporting, the use of 2D barcodes that enhance traceability, and an open discussion of potentially missed opportunities in the pharmacovigilance of biosimilars.  相似文献   

37.
38.
39.
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild...  相似文献   
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