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   3379633篇
  免费   256901篇
  国内免费   4996篇
耳鼻咽喉   47168篇
儿科学   111074篇
妇产科学   93853篇
基础医学   491713篇
口腔科学   96780篇
临床医学   305870篇
内科学   648901篇
皮肤病学   74119篇
神经病学   270047篇
特种医学   129214篇
外国民族医学   902篇
外科学   508909篇
综合类   76470篇
现状与发展   13篇
一般理论   1300篇
预防医学   267181篇
眼科学   79268篇
药学   253590篇
  13篇
中国医学   6359篇
肿瘤学   178786篇
  2018年   35770篇
  2017年   27242篇
  2016年   30535篇
  2015年   34721篇
  2014年   48792篇
  2013年   73917篇
  2012年   101089篇
  2011年   107362篇
  2010年   63784篇
  2009年   60495篇
  2008年   101361篇
  2007年   107764篇
  2006年   108961篇
  2005年   106035篇
  2004年   102538篇
  2003年   98219篇
  2002年   95855篇
  2001年   151210篇
  2000年   155963篇
  1999年   131891篇
  1998年   38352篇
  1997年   33987篇
  1996年   33967篇
  1995年   32498篇
  1994年   30212篇
  1993年   28515篇
  1992年   105528篇
  1991年   103180篇
  1990年   100785篇
  1989年   97399篇
  1988年   90177篇
  1987年   88534篇
  1986年   83710篇
  1985年   80633篇
  1984年   60451篇
  1983年   51849篇
  1982年   30776篇
  1981年   27754篇
  1979年   56807篇
  1978年   40226篇
  1977年   33745篇
  1976年   32150篇
  1975年   34381篇
  1974年   41604篇
  1973年   39786篇
  1972年   37137篇
  1971年   35073篇
  1970年   32345篇
  1969年   30734篇
  1968年   28098篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
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   
42.
43.
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   
44.
45.
46.
47.
48.
49.
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   
50.
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