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   1195029篇
  免费   84047篇
  国内免费   3838篇
耳鼻咽喉   16966篇
儿科学   30960篇
妇产科学   30732篇
基础医学   171296篇
口腔科学   36337篇
临床医学   103024篇
内科学   235191篇
皮肤病学   25434篇
神经病学   91998篇
特种医学   45958篇
外国民族医学   161篇
外科学   191232篇
综合类   26428篇
现状与发展   2篇
一般理论   287篇
预防医学   75103篇
眼科学   28839篇
药学   94035篇
  4篇
中国医学   3908篇
肿瘤学   75019篇
  2018年   12551篇
  2017年   9752篇
  2016年   10577篇
  2015年   12005篇
  2014年   16532篇
  2013年   23501篇
  2012年   32190篇
  2011年   33390篇
  2010年   19777篇
  2009年   18903篇
  2008年   31910篇
  2007年   33883篇
  2006年   34259篇
  2005年   32595篇
  2004年   31300篇
  2003年   30007篇
  2002年   29277篇
  2001年   72308篇
  2000年   74155篇
  1999年   61544篇
  1998年   14519篇
  1997年   12527篇
  1996年   12204篇
  1995年   11408篇
  1994年   10440篇
  1993年   9628篇
  1992年   45522篇
  1991年   43123篇
  1990年   41467篇
  1989年   40554篇
  1988年   36781篇
  1987年   35816篇
  1986年   33366篇
  1985年   31643篇
  1984年   22357篇
  1983年   18812篇
  1982年   9732篇
  1981年   8381篇
  1979年   19553篇
  1978年   13027篇
  1977年   11206篇
  1976年   9573篇
  1975年   10547篇
  1974年   12738篇
  1973年   12002篇
  1972年   11423篇
  1971年   10911篇
  1970年   10283篇
  1969年   9732篇
  1968年   8870篇
排序方式: 共有10000条查询结果,搜索用时 40 毫秒
81.
82.
Recurrent erosion   总被引:1,自引:0,他引:1  
  相似文献   
83.
84.
85.
86.
Six patients who injured their wrists had radiographs documenting a dorsal, 5- to 10-mm oblong fragment of bone immediately proximal to the base of the fourth and/or fifth metacarpal bones. The fragment was seen on the pronation oblique and/or lateral projections, but not on the posteroanterior projection. The radiographic appearance of the fragment was remarkably similar in all cases. In the one patient in which it was performed, pluridirectional tomography demonstrated that the fragment originated from the dorsal surface of the hamate. Five of the six patients also had associated posterior dislocation of the fourth and/or fifth metacarpals. We conclude that this fragment represents a coronal fracture through the body of the hamate resulting from posterior dislocation or subluxation of the fourth and/or fifth metacarpal.  相似文献   
87.
This article examines the discussions at the Workshop on MeasuringHealth Behaviour and Health: towards New Health Promotion Indicatorscentred on the main areas of health promotion: reviewing thestate of the art in the field of health promotion indicators,clarifying problems with current health indicators, and helpingto establish a network of institutions and individuals activein health indicator development. The Berne Workshop revealedthe differences in opinions on health promotion indicators andconcluded that the present state of the art in the field wasquite unsatisfactory. The author1 concludes by setting out sixspecific recommendations for the improvement of the currentsituation.  相似文献   
88.
We evaluated the therapeutic efficacy of miconazole (MCZ, Florid-F inj.), a new antifungal agent for parenteral use, in deep-seated fungal infections of respiratory tract system. A daily dose of 400-1,800 mg of MCZ was given intravenously for 12-38 days (mean: 23.4 days) to 7 patients: 2 patients with pulmonary aspergillosis, 1 patient with bronchial aspergillosis, 1 patient with pulmonary candidiasis and 3 patients with candidemia. One additional patient with pulmonary aspergillosis received three instillations of 20 mg of MCZ into the thoracic cavity. The clinical effects were excellent in 1, good in 4 and poor in 3 patients. The efficacy rate was 100% in 5 cases with respiratory fungal infections but 3 cases with candidemia did not respond well to the treatment. Four strains each of Aspergillus sp. and Candida sp. were identified as causative organisms. Seven of the 8 strains were eradicated by administration of MCZ. Side effects observed were irritation and heat in a leg in 1 patient, hyperlipoidemia in 2 patients and eosinophilia in 1 patient. The adverse reactions disappeared after the completion of the therapy. From the above results, we conclude that MCZ is one of the most useful antifungal agents for parenteral use as a first choice on deep-seated fungal infections in the respiratory tract.  相似文献   
89.
Antisera have been made to synthetic peptides that correspond to eight different regions of the alpha A molecule. Together with a solid phase radioimmunoassay, these antisera have been used to quantitatively assess binding to enriched alpha crystallin preparations from six different cataractous and six different normal lenses. Seven of the eight antisera show no difference in binding to alpha crystallin from cataractous versus normal lenses, whereas the antiserum directed against the alpha A sequence 120-130 shows a statistically significant decrease in binding to the alpha crystallin from cataractous lenses. Together, these studies demonstrate the feasibility of using antipeptide sera as probes of polypeptide changes during cataractogenesis and suggest that the region of the alpha A crystallin molecule encompassing residues 120-300 may undergo covalent and/or noncovalent structural modification during the process of opacification in the human senile lens.  相似文献   
90.
. Neutrophil-mediated tissue damage has been implicated in the pathogenesis of diarrhoea-associated haemolytic uraemic syndrome (D+ HUS). This study evaluates priming and activation of the neutrophil oxidative burst in D+ HUS using chemiluminescent techniques. Peripheral blood neutrophils from 11 children with acute D+ HUS were examined. No difference was found in the oxidative burst of neutrophils from patients and controls. Serum elastase levels were measured in 8 patients and found to be significantly elevated. Although elastase results suggest neutrophil activation, chemiluminescence studies do not confirm this in the peripheral blood neutrophil. This does not support a significant role for circulating agents in priming and activating the peripheral blood neutrophil. Received August 17, 1995; received in revised form and accepted November 27, 1995  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