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   2914757篇
  免费   213394篇
  国内免费   4865篇
耳鼻咽喉   40954篇
儿科学   94186篇
妇产科学   80129篇
基础医学   426563篇
口腔科学   80531篇
临床医学   260644篇
内科学   565428篇
皮肤病学   63903篇
神经病学   230804篇
特种医学   110717篇
外国民族医学   801篇
外科学   443242篇
综合类   61613篇
现状与发展   13篇
一般理论   1053篇
预防医学   225754篇
眼科学   68417篇
药学   215977篇
  11篇
中国医学   5747篇
肿瘤学   156529篇
  2019年   23240篇
  2018年   32159篇
  2017年   24435篇
  2016年   27169篇
  2015年   30667篇
  2014年   43470篇
  2013年   65597篇
  2012年   89959篇
  2011年   95795篇
  2010年   57148篇
  2009年   54051篇
  2008年   90335篇
  2007年   96078篇
  2006年   97221篇
  2005年   94419篇
  2004年   90310篇
  2003年   87110篇
  2002年   84835篇
  2001年   131551篇
  2000年   135001篇
  1999年   113995篇
  1998年   33045篇
  1997年   29298篇
  1996年   29475篇
  1995年   27691篇
  1994年   25655篇
  1993年   24219篇
  1992年   88751篇
  1991年   86153篇
  1990年   84379篇
  1989年   81259篇
  1988年   74898篇
  1987年   73649篇
  1986年   69350篇
  1985年   66410篇
  1984年   49635篇
  1983年   42328篇
  1982年   25303篇
  1979年   45821篇
  1978年   32649篇
  1977年   27229篇
  1976年   25982篇
  1975年   28101篇
  1974年   33867篇
  1973年   32357篇
  1972年   30342篇
  1971年   28559篇
  1970年   26628篇
  1969年   25227篇
  1968年   23414篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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   
33.
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   
34.
35.
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.

Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.

Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings.  相似文献   

36.
37.
38.
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   
39.
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   
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