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   544137篇
  免费   35882篇
  国内免费   758篇
耳鼻咽喉   7207篇
儿科学   17586篇
妇产科学   14289篇
基础医学   89518篇
口腔科学   16334篇
临床医学   46961篇
内科学   100491篇
皮肤病学   13110篇
神经病学   38836篇
特种医学   18961篇
外国民族医学   63篇
外科学   79541篇
综合类   8597篇
一般理论   138篇
预防医学   42468篇
眼科学   12638篇
药学   42965篇
中国医学   1194篇
肿瘤学   29880篇
  2021年   4534篇
  2019年   4615篇
  2018年   6397篇
  2017年   4604篇
  2016年   4978篇
  2015年   5660篇
  2014年   7558篇
  2013年   11402篇
  2012年   15701篇
  2011年   17277篇
  2010年   9784篇
  2009年   9024篇
  2008年   15737篇
  2007年   16701篇
  2006年   16649篇
  2005年   15863篇
  2004年   15355篇
  2003年   14501篇
  2002年   14218篇
  2001年   24167篇
  2000年   25139篇
  1999年   20644篇
  1998年   5548篇
  1997年   4826篇
  1996年   5118篇
  1995年   4687篇
  1992年   15763篇
  1991年   16337篇
  1990年   16445篇
  1989年   15815篇
  1988年   14591篇
  1987年   14433篇
  1986年   13609篇
  1985年   12987篇
  1984年   9638篇
  1983年   8259篇
  1982年   4574篇
  1979年   9422篇
  1978年   6861篇
  1977年   5774篇
  1976年   5608篇
  1975年   6403篇
  1974年   7636篇
  1973年   7135篇
  1972年   6965篇
  1971年   6686篇
  1970年   6172篇
  1969年   5889篇
  1968年   5561篇
  1967年   5013篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
3.
4.
5.
6.
7.
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   
8.
9.
Bulletin of Experimental Biology and Medicine - Ammonium, an end-product of catabolism, in low doses can promote adaptation of metabolic pathways in erythrocytes under conditions of extreme...  相似文献   
10.
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2.  相似文献   
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