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   995873篇
  免费   71280篇
  国内免费   1556篇
耳鼻咽喉   13666篇
儿科学   25828篇
妇产科学   24670篇
基础医学   141389篇
口腔科学   29582篇
临床医学   86953篇
内科学   196361篇
皮肤病学   20613篇
神经病学   78342篇
特种医学   39274篇
外国民族医学   84篇
外科学   162932篇
综合类   18943篇
现状与发展   1篇
一般理论   346篇
预防医学   66499篇
眼科学   22465篇
药学   76457篇
  3篇
中国医学   2261篇
肿瘤学   62040篇
  2021年   7467篇
  2019年   7516篇
  2018年   10800篇
  2017年   8285篇
  2016年   9136篇
  2015年   10462篇
  2014年   14200篇
  2013年   20277篇
  2012年   28350篇
  2011年   29330篇
  2010年   17283篇
  2009年   16458篇
  2008年   28094篇
  2007年   29349篇
  2006年   29978篇
  2005年   28700篇
  2004年   27574篇
  2003年   26396篇
  2002年   25732篇
  2001年   55680篇
  2000年   57493篇
  1999年   47896篇
  1998年   11398篇
  1997年   9977篇
  1996年   10016篇
  1995年   9369篇
  1994年   8625篇
  1993年   7942篇
  1992年   36154篇
  1991年   34544篇
  1990年   33289篇
  1989年   32417篇
  1988年   29513篇
  1987年   28719篇
  1986年   26734篇
  1985年   25633篇
  1984年   18264篇
  1983年   15521篇
  1982年   8103篇
  1979年   16138篇
  1978年   10885篇
  1977年   9299篇
  1976年   8104篇
  1975年   8844篇
  1974年   10726篇
  1973年   10137篇
  1972年   9627篇
  1971年   9096篇
  1970年   8638篇
  1969年   8134篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
Recurrent erosion   总被引:1,自引:0,他引:1  
  相似文献   
74.
75.
76.
77.
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   
78.
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   
79.
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   
80.
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   
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