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   2036983篇
  免费   143668篇
  国内免费   3940篇
耳鼻咽喉   30120篇
儿科学   59595篇
妇产科学   56439篇
基础医学   288602篇
口腔科学   62124篇
临床医学   176493篇
内科学   394172篇
皮肤病学   44954篇
神经病学   161086篇
特种医学   80483篇
外国民族医学   503篇
外科学   318898篇
综合类   45196篇
现状与发展   7篇
一般理论   646篇
预防医学   142434篇
眼科学   48617篇
药学   155133篇
  7篇
中国医学   4531篇
肿瘤学   114551篇
  2018年   18825篇
  2016年   16704篇
  2015年   18803篇
  2014年   26008篇
  2013年   39176篇
  2012年   52170篇
  2011年   55036篇
  2010年   32657篇
  2009年   31520篇
  2008年   53077篇
  2007年   56855篇
  2006年   57802篇
  2005年   55917篇
  2004年   54342篇
  2003年   52361篇
  2002年   51561篇
  2001年   100732篇
  2000年   103719篇
  1999年   87494篇
  1998年   22698篇
  1997年   20495篇
  1996年   20039篇
  1995年   18900篇
  1994年   17577篇
  1993年   16325篇
  1992年   67673篇
  1991年   65474篇
  1990年   64124篇
  1989年   62373篇
  1988年   57806篇
  1987年   56684篇
  1986年   53766篇
  1985年   51456篇
  1984年   37950篇
  1983年   32414篇
  1982年   18603篇
  1981年   16827篇
  1979年   35953篇
  1978年   25309篇
  1977年   22011篇
  1976年   19677篇
  1975年   22172篇
  1974年   26455篇
  1973年   25561篇
  1972年   24307篇
  1971年   22783篇
  1970年   21695篇
  1969年   20646篇
  1968年   19241篇
  1967年   17294篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
As countries implement Article 11 of the World Health Organization (WHO) Framework Convention on Tobacco Control, graphic warning labels that use images of people and their body parts to illustrate the consequences of smoking are being added to cigarette packs. According to exemplification theory, these case examples—exemplars—can shape perceptions about risk and may resonate differently among demographic subpopulations. Drawing on data from eight focus groups (N = 63) with smokers and nonsmokers from vulnerable populations, this qualitative study explores whether people considered exemplars in their reactions to and evaluations of U.S. graphic health warning labels initially proposed by the Food and Drug Administration. Participants made reference to prior and concurrent mass media messages and exemplars during the focus groups and used demographic cues in making sense of the images on the warning labels. Participants were particularly sensitive to age of the exemplars and how it might affect label effectiveness and beliefs about smoking. Race and socioeconomic status also were salient for some participants. We recommend that exemplars and exemplification be considered when selecting and evaluating graphic health warnings for tobacco labels and associated media campaigns.  相似文献   
93.
94.
95.
96.
97.
Purpose/aim: To focus on current aspects of primary thyroid lymphoma (PTL), which is a rare clinical entity usually manifested by a rapidly growing mass in the neck that can cause pressure symptoms.

Materials and Methods: Relevant papers in PubMed published through June 2017 were selected to track updated information about PTL with an emphasis on diagnosis and novel therapeutic management.

Results: The most frequent cases include non-Hodgkin lymphoma derived from B-cells, mainly diffuse large B-cell lymphoma (DLBCL) followed by mucosa-associated lymphoid tissue (MALT) lymphoma or a mixed type. Other subtypes are less common. Lymphomas derived from T-cells and Hodgkin lymphomas are extremely rare. Hashimoto's autoimmune thyroiditis has been implicated as a risk factor for lymphoma. At the molecular level, the Wnt5a protein and its receptor Ror2 are involved in the course of the disease. Ultrasonography, fine needle aspiration (FNA) biopsy, and core or open biopsy combined with new diagnostic facilities contribute to an accurate diagnosis. An increased potential exists for a cure without the need for a radical surgical procedure. Modern chemoradiation therapy plus the monoclonal antibody rituximab, which acts against CD20, have limited the need for surgical interventions and provide an excellent outcome in most cases. However, some cases have resulted in treatment failure or recurrence.

Conclusions: A multidisciplinary approach must be used to define the management policy in each case. Future efforts by researchers are likely to be focused on the molecular level.  相似文献   

98.
99.
100.
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