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   907261篇
  免费   57627篇
  国内免费   2311篇
耳鼻咽喉   12527篇
儿科学   28741篇
妇产科学   26187篇
基础医学   126886篇
口腔科学   24748篇
临床医学   74976篇
内科学   183828篇
皮肤病学   19069篇
神经病学   71706篇
特种医学   36570篇
外国民族医学   336篇
外科学   142419篇
综合类   19033篇
一般理论   247篇
预防医学   64669篇
眼科学   20131篇
药学   63994篇
  14篇
中国医学   1810篇
肿瘤学   49308篇
  2018年   9111篇
  2017年   7235篇
  2016年   7764篇
  2015年   8769篇
  2014年   12423篇
  2013年   19249篇
  2012年   25740篇
  2011年   27357篇
  2010年   16629篇
  2009年   15844篇
  2008年   26233篇
  2007年   27811篇
  2006年   27979篇
  2005年   27510篇
  2004年   26375篇
  2003年   25530篇
  2002年   25118篇
  2001年   41402篇
  2000年   42609篇
  1999年   36306篇
  1998年   9980篇
  1997年   9161篇
  1996年   9096篇
  1995年   8459篇
  1994年   8090篇
  1993年   7594篇
  1992年   28220篇
  1991年   26993篇
  1990年   26432篇
  1989年   25371篇
  1988年   23579篇
  1987年   23192篇
  1986年   22265篇
  1985年   21165篇
  1984年   15822篇
  1983年   13491篇
  1982年   8090篇
  1979年   14595篇
  1978年   10215篇
  1977年   8629篇
  1976年   8154篇
  1975年   8963篇
  1974年   10704篇
  1973年   10188篇
  1972年   9670篇
  1971年   8927篇
  1970年   8593篇
  1969年   8031篇
  1968年   7692篇
  1967年   7092篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
IntroductionThe number of solid organ transplants completed annually continues to trend upwards each year. Despite this, maintenance immunosuppression available on the market has remained relatively stagnant. Standard triple immunosuppression, composed typically of tacrolimus, mycophenolate, and steroids, lead to many side effects that limit the use of these medications. Tacrolimus, specifically, causes nephrotoxicity that can lead to renal dysfunction requiring a kidney transplant down the road. Alternative therapies for the management of immunosuppression need to be identified to try to mitigate these adverse effects.BodyCytokines are responsible for facilitating T cell differentiation and lead to the activation of inflammatory mediators that can contribute to graft damage and ultimately rejection. IL-4, IL-6, IL-12/23, and IL-15 are attractive targets for medications to try to ameliorate graft rejection. Various cytokine-targeted medications are currently available on the market for the treatment of inflammatory and autoimmune conditions such as rheumatoid arthritis, psoriatic arthritis, Crohn’s, and multiple sclerosis.ConclusionThis article reviews cytokine involvement in alloimmunity and the potential role cytokine-targeted therapy may play in prevention of allograft rejection in solid organ transplant recipients.  相似文献   
62.
Virus Genes - Avian influenza viruses (AIVs) circulate globally, spilling over into domestic poultry and causing zoonotic infections in humans. Fortunately, AIVs are not yet capable of causing...  相似文献   
63.
PurposePatellofemoral arthroplasty (PFA) prosthesis with asymmetric trochlear component was introduced as an improvement from existing designs for surgical treatment of symptomatic isolated patellofemoral arthritis. The purpose of this study was to evaluate midterm results in patients who underwent PFA procedure using such prosthesis.MethodsOur study involved a continuous retrospective cohort of patients who underwent PFA using Journey PFA prosthesis with an asymmetric trochlear component, performed between June 2007 and July 2016 at a non-designer centre. The Patient Reported Outcome Measures and patient satisfaction questionnaires were collected for final evaluation.ResultsA total of 103 PFA performed on 79 patients were evaluated. Median age at the time of surgery was 58 years (range 42 to 78 years); the mean follow-up period was 6 years (range 2 to 11 years). Four knees were revised to Total Knee Arthroplasty for reasons not related to the implant. The cumulative survival estimated by the Kaplan–Meier method was 94.3% (95% confidence interval: 88.4%–100%). There were statistically significant improvements in functional outcome scores.ConclusionThis series of patients who underwent PFA with the asymmetric trochlear component has shown promising mid-term results with no implant-related complications.  相似文献   
64.
Parasitology Research - It is known that premature elimination of non-parasitized RBCs (nRBCs) plays an important role in the pathogenesis of malarial anemia, in which suicidal death process...  相似文献   
65.
Inflammation Research - Although some glycolytic intermediates have been shown to modulate several cell type formation and activation, the functional role of fructose 1,6-bisphosphate (FBP) on...  相似文献   
66.
67.
Introduction The prevalence of pediatric obesity is an issue in the United States, in which approximately one-third of children and adolescents are overweight or obese. Youth living in low socioeconomic (SES) households are at an increased risk for developing obesity; yet, research is needed to understand the mechanisms that might better explain the relationship between SES and obesity risk. Maternal depression presents a potential mechanism by which SES might predict a later risk for obesity in pediatric populations. Methods The present study used a national dataset from the National Institute of Child Health and Human Development—Study of Early Child Care and Youth Development (NICHD-SECCYD) to examine whether maternal depressive symptoms (at an age of 9 years) mediated the association between early SES (the income-to-needs ratio measured at an age of 1 month) and adolescent weight outcomes [Body Mass Index z-scores (zBMI) for age and sex, at an age of 15 years]. Results The results suggested that greater maternal depressive symptoms helped to explain a significant amount of the variance of lower SES predicting poorer weight outcomes in adolescents. Discussion These findings illustrate the role of maternal depressive symptoms in explaining how SES predicts adolescent weight outcomes. Implications are discussed, and future research is needed to identify women from lower SES households who are experiencing depressive symptoms to provide support and initiate points of early intervention to address relevant health outcomes in youths.  相似文献   
68.
69.
70.
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