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   1464674篇
  免费   106445篇
  国内免费   2637篇
耳鼻咽喉   20289篇
儿科学   47243篇
妇产科学   41668篇
基础医学   211181篇
口腔科学   39565篇
临床医学   126422篇
内科学   290452篇
皮肤病学   29059篇
神经病学   117525篇
特种医学   56303篇
外国民族医学   379篇
外科学   226612篇
综合类   29648篇
现状与发展   3篇
一般理论   584篇
预防医学   110264篇
眼科学   32964篇
药学   110838篇
  2篇
中国医学   2798篇
肿瘤学   79957篇
  2018年   15315篇
  2017年   11780篇
  2016年   13110篇
  2015年   15242篇
  2014年   21435篇
  2013年   32318篇
  2012年   45184篇
  2011年   48697篇
  2010年   28433篇
  2009年   26476篇
  2008年   47059篇
  2007年   50713篇
  2006年   50760篇
  2005年   50536篇
  2004年   48693篇
  2003年   46918篇
  2002年   45964篇
  2001年   59837篇
  2000年   60989篇
  1999年   52556篇
  1998年   16760篇
  1997年   14984篇
  1996年   15047篇
  1995年   14112篇
  1994年   13343篇
  1993年   12371篇
  1992年   42061篇
  1991年   41384篇
  1990年   40860篇
  1989年   39591篇
  1988年   37038篇
  1987年   36281篇
  1986年   34650篇
  1985年   33124篇
  1984年   25290篇
  1983年   22160篇
  1982年   14016篇
  1981年   12398篇
  1979年   23376篇
  1978年   16776篇
  1977年   14579篇
  1976年   13726篇
  1975年   14819篇
  1974年   17302篇
  1973年   16633篇
  1972年   15717篇
  1971年   14562篇
  1970年   13522篇
  1969年   12964篇
  1968年   12171篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
38 cases of acute multilocular osteomyelitis out of a total of 165 osteomyelitis patients were treated between 1974 and 1986 at the Department of Paediatric Surgery and Paediatric Diseases at the University of Mainz. Osteomyelitis in infants was separated from juvenile osteomyelitis because of the different problems inherent to this disease depending upon the age; likewise, multilocular remote involvement was separated from regional multiple involvement. It was found that distant involvement is of special importance in infancy. 6 of the 8 cases in this group presented with symmetrical involvement. This interesting phenomenon is described in this article for the first time in acute multilocular osteomyelitis; so far, it was known to occur only in chronic recurrent multifocal osteomyelitis (CRMO). The infants in this group were predominantly newborn who were particularly severely handicapped by predisposing factors such as necessary intensive-care measures or surgical interventions. Our findings showed that in this age group most of the problems occurred, namely: 3 deaths and 2 healing defects in 8 children. For this reason it is imperative to effect particularly close monitoring of multilocular acute osteomyelitis in infancy. This must be considered as a paediatric and paediatric-surgical emergency requiring not only accurate diagnostic measures but also early internistic and surgical treatment to improve the prognosis of this specific disease pattern.  相似文献   
102.
The Authors examine the correlation between hypertensive disorders of pregnancy and fetal growth. The results of a study of 342 pregnancies, confirm a significant correlation between hypertension and fetal growth retardation. These findings, so evident in moderate and severe hypertension, have also been confirmed in cases of mild hypertension. The medical treatment also in the pregnancies with mild hypertension, and a larger utilisation of operative deliveries, determined a decrease in perinatal mortality and morbidity.  相似文献   
103.
104.
Background The appearance of eosinophils is a hallmark sign of the allergic late-phase response (LPR). Eosinophil cationic protein (ECP), a readily measurable product released from activated eosinophils, has so far not been evaluated in the ocular LPR. Objective Two sets of trials were performed in order to investigate changes of local and systemic eosinophil activity and their possible link with symptoms and hyper-reactivity in the allergic LPR in the eye. Methods In the first experiment, ECP was analysed in tears and serum and the clinical reaction was evaluated during a 72-h time–course after a single, high-dose allergen challenge out of season in one eye of 15 pollen-sensitized volunteers. In a second experiment, the hypothesis of an increased clinical response to an allergen challenge in an eye that had been provoked with allergen 48h previously was tested in nine sensitized individuals. Results In the first experiment, symptoms at 10 min and 2, 4, 6, 8 and 24 h significantly exceeded base line scores of the challenged eyes. Tear ECP was significantly elevated in challenged eyes compared to contralateral eyes at 6, 8 and 24 h. In addition, symptoms and ECP release correlated significantly at the 24-h evaluation. Serum ECP remained unchanged throughout the study period. In the second experiment, conjunctival hyperreactivity 48h after an allergen challenge was not confirmed. Conclusion ECP secretion occurs in the experimental ocular LPR and is in part associated with the magnitude of the clinical reaction, which suggests a truly pathogenic role of the activated eosinophil in pollen-induced allergic conjunctivitis.  相似文献   
105.
106.
107.
108.
109.
110.
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