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   2174篇
  免费   119篇
  国内免费   49篇
耳鼻咽喉   10篇
儿科学   81篇
妇产科学   71篇
基础医学   182篇
口腔科学   42篇
临床医学   228篇
内科学   639篇
皮肤病学   130篇
神经病学   27篇
特种医学   5篇
外科学   344篇
综合类   119篇
一般理论   2篇
预防医学   113篇
眼科学   21篇
药学   244篇
中国医学   40篇
肿瘤学   44篇
  2018年   15篇
  2017年   23篇
  2016年   23篇
  2015年   47篇
  2014年   46篇
  2013年   78篇
  2012年   51篇
  2011年   52篇
  2010年   124篇
  2009年   150篇
  2008年   61篇
  2007年   60篇
  2006年   114篇
  2005年   37篇
  2004年   13篇
  2003年   25篇
  2002年   24篇
  2001年   11篇
  1999年   34篇
  1998年   66篇
  1997年   97篇
  1996年   112篇
  1995年   71篇
  1994年   63篇
  1993年   67篇
  1992年   49篇
  1991年   33篇
  1990年   42篇
  1989年   26篇
  1988年   36篇
  1987年   30篇
  1986年   28篇
  1985年   12篇
  1984年   13篇
  1983年   17篇
  1982年   13篇
  1980年   12篇
  1979年   15篇
  1978年   21篇
  1977年   15篇
  1976年   12篇
  1965年   13篇
  1959年   23篇
  1958年   64篇
  1957年   61篇
  1956年   59篇
  1955年   52篇
  1954年   43篇
  1949年   26篇
  1948年   15篇
排序方式: 共有2342条查询结果,搜索用时 15 毫秒
1.
Cytogenetic abnormalities are observed in approximately two‐thirds of patients with acute myeloid leukemia (AML). Chromosome rearrangements are associated with specific subtypes of AML and associated prognosis. We report a patient with AML, M2, who was primarily refractory to standard induction chemotherapy with idarubicin and cytarabine. Flow cytometry of a bone marrow aspirate showed aberrant expression of B‐cell markers including CD19. Cytogenetic studies disclosed a translocation between 5q35 and 11q13. Fluorescence in situ hybridization analyses demonstrated that neither the NSD1 nor MLL genes were involved in this case. Further study is required to define conclusively the genes involved and their contribution to pathogenesis in this case.  相似文献   
2.
Most ureteral tumors are transitional cell neoplasms. Neuroendocrine tumors of the genitourinary tract are extremely rare. To our knowledge, only one ureteral carcinoid tumor has been reported before. We report a second case of ureteral carcinoid tumor found in a 70-year-old female.  相似文献   
3.
Abstract  Gastrointestinal stromal tumor (GIST) is a recently described mesenchymal tumor that can develop in any portion of the gastrointestinal tract. The occurrence of a GIST in the urinary tract is rare, but GIST can present as tumor of the urinary tract or invade the urinary tract. This is the first reported case of GIST in the ileal neobladder, which presented as a submucosal tumor. The patient underwent an open exploration and partial resection of the neobladder pouch.  相似文献   
4.
5.
The Australian government established the Council on Overseas Professional Qualifications (COPQ) in 1969. In response to approaches by the occupational therapy profession, an Expert Panel in Occupational Therapy was established in 1979 in order to develop a screening examination to be used in assessing the competency of overseas trained occupational therapists. This paper describes the development of the COPQ examination for all overseas qualified occupational therapists wishing to work in Australia; the experience of candidates since its inception in 1983; and the problems associated with achieving recognition of the COPQ examination throughout Australia given the lack of uniform recognition procedures in the various States and Territories. The need for a consistent national approach to the policy of recognition and employment of overseas trained occupational therapists is addressed, with stress placed on the need for all employer groups, in both the public and the private sectors, to cooperate with COPQ's assessment procedures.  相似文献   
6.
Summary. Twenty artificial periapical lesions confined to cancellous bone were prepared at the apices of first and second mandibular molars of human cadavers. The lesions emphasized removal of the lamina dura and preparation of a 'halo' lesion surrounding the root apex, plus the addition of a simulated sclerotic border. Radiographs taken before and after creation of the lesions were scored by three examiners for detectable lesions Cross-sections of the lesions were assessed for the extent of bone destruction. Periapical lesions confined to cancellous bone were detected in 80 per cent of cases, and the presence of a sclerotic border tended to enhance visualization, although not in all cases. Intentional cortical involvement also improved detection of lesions. The anatomical features of the periapical area appear to promote the visualization of lesions which might not be detected in other locations.  相似文献   
7.
8.
9.
10.
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