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   10686篇
  免费   983篇
  国内免费   112篇
耳鼻咽喉   100篇
儿科学   283篇
妇产科学   369篇
基础医学   1625篇
口腔科学   130篇
临床医学   885篇
内科学   2142篇
皮肤病学   500篇
神经病学   1041篇
特种医学   457篇
外科学   1353篇
综合类   104篇
一般理论   2篇
预防医学   1057篇
眼科学   102篇
药学   914篇
中国医学   37篇
肿瘤学   680篇
  2023年   83篇
  2021年   169篇
  2020年   140篇
  2019年   196篇
  2018年   204篇
  2017年   190篇
  2016年   197篇
  2015年   218篇
  2014年   242篇
  2013年   461篇
  2012年   532篇
  2011年   507篇
  2010年   335篇
  2009年   323篇
  2008年   481篇
  2007年   463篇
  2006年   482篇
  2005年   458篇
  2004年   441篇
  2003年   386篇
  2002年   342篇
  2001年   325篇
  2000年   335篇
  1999年   306篇
  1998年   173篇
  1997年   132篇
  1996年   134篇
  1995年   140篇
  1994年   123篇
  1993年   121篇
  1992年   212篇
  1991年   225篇
  1990年   212篇
  1989年   246篇
  1988年   225篇
  1987年   204篇
  1986年   180篇
  1985年   183篇
  1984年   149篇
  1983年   109篇
  1982年   93篇
  1981年   70篇
  1979年   104篇
  1978年   78篇
  1977年   85篇
  1976年   63篇
  1975年   63篇
  1974年   65篇
  1973年   68篇
  1972年   61篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Healthcare workers (HCWs) are at increased risk of both exposure and transmission of infectious disease. Two European Union (EU) directives state that health services are responsible for assessing their employees’ potential exposure to infectious diseases and offering immunisation free of charge. We assessed current policy for immunisation of HCWs and the availability of vaccine coverage data in the Nordic countries by surveying national vaccination experts in Denmark, Finland, Iceland, Norway and Sweden, as well as Swedish county medical officers (CMOs). All national experts and 17 of 21 Swedish CMOs responded. All EU countries had transposed the European directives into national law, while Norway and Iceland had similar national legislation. Recommendations or guidelines were issued in Denmark, Finland, Iceland, Norway and 15 of 17 responding Swedish counties. The range of diseases covered differed by countries and Swedish counties. HCW vaccine coverage data were not systematically collected; incomplete estimates were only available for Finland and two Swedish counties. In conclusion, recommendations or guidelines exist in the Nordic countries, but their impact cannot be assessed, as vaccine uptake among HCWs is not currently measured. Systematic collection of data is a necessary step towards improving HCW immunisation policy and practice in the Nordic countries.  相似文献   
4.
In a randomised, double-blind study, 20 women with idiopathic detrusor instability and associated symptoms were treated with terodiline 25 mg bd, placebo, and emepronium bromide 200 mg tds--each drug being given for 3 weeks with placebo as wash-out period before cross-over. The results were evaluated according to drug preference, frequency charts and elimination of detrusor instability on cystometry. Serum levels of both drugs were monitored as control of tablet intake. The preference for terodiline to placebo was statistically significant: 14/3 women (P less than 0.05), and the majority of women (12/4) preferred terodiline to emepronium. Terodiline also gave a small but significant reduction in 24 h micturition frequency and eliminated detrusor instability in almost 50% of the patients (P less than 0.05). Side effects were frequent but mild in all three treatment periods. It was concluded that terodiline offers an alternative in the treatment of female detrusor instability.  相似文献   
5.
6.
顺铂聚乳酸微球的药物释放特性及肝动脉栓塞研究   总被引:5,自引:0,他引:5  
对顺铂聚乳酸微球进行了体外药物释放和家犬肝动脉栓塞研究。该微球粒径范围为50~200μm,平均粒径为115.76±35.94μm,顺铂含量为37.16%(W/W);体外药物释放机制符合Higuchi方程;肝动脉栓塞后8h,肝组织顺铂浓度高达21.55±12.18μg/g,明显高于肝动脉灌注顺铂组:3.16±0.09μg/g(P<0.05);肝动脉栓塞组的顺铂血浓峰值、各取血点浓度及曲线下面积AUC皆低于肝动脉灌注顺铂组。可望达到提高栓塞部位的药物疗效,降低全身毒副反应的作用。  相似文献   
7.
Two cases are presented in which the cause of small-bowel obstruction was enterolith originating in jejunal diverticula.  相似文献   
8.
To measure prefrontal and subcortical activity during a cognitive task, we examined 19 newly diagnosed schizophrenics and patients with schizophreniform psychosis. Seven healthy volunteers served as controls. The patients were drug naive or had received neuroleptics for a few days only. Cerebral blood flow distribution was depicted by single photon emission computed tomography at rest and during activation with the Wisconsin Card Sorting Test. A significant relative activation deficit in the left inferior-prefrontal region was revealed during the Wisconsin Card Sorting Test in the patient group. Furthermore, the patients had impaired striatal suppression on the left side during the cognitive task. The test performance was significantly impaired in the patients. The inability to reduce striatal activity may be due to a lack of corticostriatal feedback during prefrontal activation.  相似文献   
9.
In a prospective, randomized trial, 104 consecutive patients with displaced femoral neck fractures were allocated either to fixation with a sliding screw plate or 4 ASIF cancellous bone screws. The patients were reexamined at fixed intervals to determine the time of union. The 2-year-cumulated rate of union was 64 per cent in the plate group and 84 per cent in the screw group.  相似文献   
10.
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