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   1617860篇
  免费   130828篇
  国内免费   4116篇
耳鼻咽喉   20765篇
儿科学   52075篇
妇产科学   45038篇
基础医学   228107篇
口腔科学   41683篇
临床医学   147360篇
内科学   327978篇
皮肤病学   36296篇
神经病学   137293篇
特种医学   60730篇
外国民族医学   472篇
外科学   241707篇
综合类   35774篇
现状与发展   3篇
一般理论   783篇
预防医学   128168篇
眼科学   37062篇
药学   113044篇
  6篇
中国医学   3642篇
肿瘤学   94818篇
  2021年   15325篇
  2019年   15991篇
  2018年   21480篇
  2017年   16366篇
  2016年   18320篇
  2015年   20756篇
  2014年   29683篇
  2013年   43245篇
  2012年   60288篇
  2011年   63506篇
  2010年   37006篇
  2009年   34935篇
  2008年   58214篇
  2007年   61518篇
  2006年   61949篇
  2005年   60348篇
  2004年   57397篇
  2003年   54402篇
  2002年   52034篇
  2001年   74756篇
  2000年   75870篇
  1999年   63515篇
  1998年   19563篇
  1997年   17595篇
  1996年   17368篇
  1995年   16532篇
  1994年   14902篇
  1993年   13905篇
  1992年   46886篇
  1991年   44428篇
  1990年   42321篇
  1989年   40365篇
  1988年   37013篇
  1987年   36160篇
  1986年   33664篇
  1985年   32094篇
  1984年   24874篇
  1983年   20993篇
  1982年   13399篇
  1981年   11909篇
  1979年   21301篇
  1978年   15228篇
  1977年   12640篇
  1976年   11855篇
  1975年   12019篇
  1974年   14383篇
  1973年   13871篇
  1972年   12940篇
  1971年   11716篇
  1970年   11114篇
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
31.
32.
33.
34.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
35.
There is a sharp difference in how one views TCR structure–function–behaviour dependent on whether its recognition of major histocompatibility complex‐encoded restriction elements (R) is germline selected or somatically generated. The generally accepted or Standard model is built on the assumption that recognition of R is by the V regions of the αβ TCR, which is not driven by allele specificity, whereas the competing model posits that recognition of R is allele‐specific. The establishing of allele‐specific recognition of R by the TCR would rule out the Standard model and clear the road to a consideration of a competing construct, the Tritope model. Here, the case for allele‐specific recognition (germline selected) is detailed making it obvious that the Standard model is untenable.  相似文献   
36.
37.
Introduction: The treatment of classical Hodgkin lymphoma (cHL) in children is a story of success. Nowadays, more than 90% of patients are cured and overall survival is nearly 100% at 5 years. Efforts have been made to avoid related effects of therapies; therefore, children are treated using different chemotherapy schemes in comparison with adults.

Areas covered: This review includes a view of the clinical classification and risk assessment in children suffering from HL. The chemotherapy more commonly employed is revisited. The use of PET/CT to evaluate the disease in order to guide therapy is analyzed. New options of chemotherapy and emerging immunotherapy are also included.

Expert opinion: In order to make the right treatment choice, a proper initial assessment of risk is mandatory. The choice of therapy in these kinds of patients must be done according to the experience of the team, and also, the cost and logistics related to the eligible scheme are very important. If possible, efforts must be made to include PET/CT in guiding therapy and avoiding overtreatment and long-term adverse effects in children. New options in immunotherapy are emerging and must be considered with caution in selected patients.  相似文献   

38.
Purpose: To use polymerase chain reaction (PCR) and Goldmann-Witmer coefficient (GWC) calculation to diagnose infectious uveitis.

Methods: Prospective cross-sectional study.

Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.

Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis.  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