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   1996篇
  免费   111篇
  国内免费   49篇
耳鼻咽喉   9篇
儿科学   73篇
妇产科学   69篇
基础医学   169篇
口腔科学   39篇
临床医学   217篇
内科学   593篇
皮肤病学   116篇
神经病学   21篇
特种医学   5篇
外科学   302篇
综合类   113篇
一般理论   2篇
预防医学   95篇
眼科学   21篇
药学   235篇
中国医学   37篇
肿瘤学   40篇
  2018年   15篇
  2017年   19篇
  2016年   20篇
  2015年   40篇
  2014年   41篇
  2013年   72篇
  2012年   48篇
  2011年   53篇
  2010年   107篇
  2009年   133篇
  2008年   56篇
  2007年   57篇
  2006年   101篇
  2005年   32篇
  2003年   20篇
  2002年   21篇
  1999年   30篇
  1998年   57篇
  1997年   91篇
  1996年   90篇
  1995年   66篇
  1994年   61篇
  1993年   63篇
  1992年   44篇
  1991年   31篇
  1990年   41篇
  1989年   25篇
  1988年   34篇
  1987年   29篇
  1986年   27篇
  1985年   12篇
  1984年   13篇
  1983年   15篇
  1982年   13篇
  1981年   10篇
  1980年   10篇
  1979年   14篇
  1978年   21篇
  1977年   12篇
  1976年   12篇
  1965年   12篇
  1961年   10篇
  1959年   23篇
  1958年   63篇
  1957年   61篇
  1956年   59篇
  1955年   52篇
  1954年   43篇
  1949年   25篇
  1948年   15篇
排序方式: 共有2156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