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   1285952篇
  免费   93593篇
  国内免费   1994篇
耳鼻咽喉   18376篇
儿科学   42508篇
妇产科学   38295篇
基础医学   188253篇
口腔科学   35691篇
临床医学   109107篇
内科学   253445篇
皮肤病学   26573篇
神经病学   100421篇
特种医学   50248篇
外国民族医学   366篇
外科学   198834篇
综合类   26663篇
现状与发展   1篇
一般理论   302篇
预防医学   93140篇
眼科学   29257篇
药学   98272篇
  1篇
中国医学   2497篇
肿瘤学   69289篇
  2018年   11943篇
  2015年   11735篇
  2014年   16173篇
  2013年   24638篇
  2012年   33900篇
  2011年   36328篇
  2010年   21441篇
  2009年   20262篇
  2008年   35328篇
  2007年   38328篇
  2006年   38900篇
  2005年   38193篇
  2004年   36736篇
  2003年   35696篇
  2002年   35276篇
  2001年   58349篇
  2000年   59869篇
  1999年   50902篇
  1998年   14319篇
  1997年   12902篇
  1996年   13160篇
  1995年   12421篇
  1994年   11835篇
  1993年   10937篇
  1992年   41171篇
  1991年   40550篇
  1990年   40104篇
  1989年   38935篇
  1988年   36314篇
  1987年   35546篇
  1986年   33911篇
  1985年   32336篇
  1984年   24088篇
  1983年   20938篇
  1982年   12470篇
  1981年   11038篇
  1980年   10277篇
  1979年   22783篇
  1978年   16005篇
  1977年   13831篇
  1976年   13059篇
  1975年   14276篇
  1974年   16816篇
  1973年   16196篇
  1972年   15419篇
  1971年   14316篇
  1970年   13302篇
  1969年   12802篇
  1968年   12035篇
  1967年   10541篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
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   
92.
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   
93.
94.
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   
95.
96.
97.
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