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   1295499篇
  免费   93840篇
  国内免费   2190篇
耳鼻咽喉   18342篇
儿科学   42575篇
妇产科学   38133篇
基础医学   189801篇
口腔科学   35969篇
临床医学   109842篇
内科学   256306篇
皮肤病学   26734篇
神经病学   101077篇
特种医学   50645篇
外国民族医学   366篇
外科学   200390篇
综合类   26578篇
现状与发展   1篇
一般理论   303篇
预防医学   93539篇
眼科学   29302篇
药学   99208篇
  1篇
中国医学   2553篇
肿瘤学   69864篇
  2018年   12389篇
  2016年   10544篇
  2015年   12171篇
  2014年   16717篇
  2013年   25245篇
  2012年   34988篇
  2011年   37410篇
  2010年   22032篇
  2009年   20734篇
  2008年   36114篇
  2007年   39169篇
  2006年   39585篇
  2005年   38961篇
  2004年   37420篇
  2003年   36278篇
  2002年   35805篇
  2001年   58277篇
  2000年   59759篇
  1999年   50873篇
  1998年   14436篇
  1997年   12954篇
  1996年   13172篇
  1995年   12457篇
  1994年   11859篇
  1993年   10956篇
  1992年   41107篇
  1991年   40453篇
  1990年   39965篇
  1989年   38782篇
  1988年   36171篇
  1987年   35411篇
  1986年   33774篇
  1985年   32191篇
  1984年   23970篇
  1983年   20858篇
  1982年   12416篇
  1981年   10965篇
  1979年   22655篇
  1978年   15896篇
  1977年   13750篇
  1976年   12988篇
  1975年   14215篇
  1974年   16702篇
  1973年   16102篇
  1972年   15334篇
  1971年   14248篇
  1970年   13231篇
  1969年   12741篇
  1968年   11991篇
  1967年   10488篇
排序方式: 共有10000条查询结果,搜索用时 0 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