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   1332篇
  免费   186篇
  国内免费   28篇
儿科学   66篇
妇产科学   14篇
基础医学   143篇
口腔科学   48篇
临床医学   167篇
内科学   423篇
皮肤病学   17篇
神经病学   31篇
特种医学   271篇
外科学   86篇
综合类   34篇
预防医学   87篇
眼科学   5篇
药学   107篇
肿瘤学   47篇
  2019年   14篇
  2018年   27篇
  2017年   13篇
  2016年   14篇
  2015年   19篇
  2014年   26篇
  2013年   19篇
  2012年   31篇
  2011年   38篇
  2010年   42篇
  2009年   29篇
  2008年   29篇
  2007年   50篇
  2006年   46篇
  2005年   45篇
  2004年   40篇
  2003年   31篇
  2002年   26篇
  2001年   24篇
  2000年   30篇
  1999年   23篇
  1998年   66篇
  1997年   72篇
  1996年   81篇
  1995年   50篇
  1994年   38篇
  1993年   44篇
  1992年   26篇
  1991年   22篇
  1990年   23篇
  1989年   43篇
  1988年   54篇
  1987年   46篇
  1986年   41篇
  1985年   46篇
  1984年   18篇
  1983年   20篇
  1982年   31篇
  1981年   21篇
  1980年   21篇
  1979年   15篇
  1978年   10篇
  1977年   24篇
  1976年   15篇
  1975年   17篇
  1974年   7篇
  1972年   10篇
  1969年   7篇
  1968年   6篇
  1966年   7篇
排序方式: 共有1546条查询结果,搜索用时 15 毫秒
1.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome.  相似文献   
2.
3.
4.
Sonoelasticity imaging of prostate cancer: in vitro results   总被引:2,自引:0,他引:2  
  相似文献   
5.
6.
7.
8.
9.
The EUROCAT programme is a concerted action of the European Economic Community for the epidemiologic surveillance of congenital anomalies. Surveillance is based on a network of regional registries coordinated by a central registry. The programme started in 1979 and by 1987, 23 centres were participating, covering together more than 300,000 births per year. The surveillance process implies the selection of the anomalies possibly associated with environmental teratogens or mutagens, the definition of abnormal variations in the rate of these anomalies (the alarms), the establishment of base-line rate and the continuous monitoring of rate. The programme is evaluated by reference to four criteria: the sensitivity of the system in detecting teratogens or mutagens, the specificity of alarms, the rapidity in warning of alarm and in investigating their causes, and the programme efficiency expressed as its cost-utility ratio.  相似文献   
10.
Ten thrombocytopenic patients (platelets < 10–24 × 10(9)/L) who were refractory to platelet transfusion were investigated for their responsiveness to staphylococcal protein A column therapy. Nine patients had previously been treated with steroids, intravenous immune globulin, and/or other forms of immunosuppressive therapy without improvement in their transfusion response. All patients were receiving multiple platelet transfusions without achieving 1-hour corrected count increments (CCIs) > or = 7500. Eight patients had antibodies that reacted with platelets and were directed against HLA class I antigens, ABO antigens, and/or platelet-specific alloantigens. Plasma (500-2000 mL) from each patient was passed over a protein A silica gel column and then returned to the patient. Patients received from 1 to 14 treatments. A positive response to protein A therapy was defined as at least a doubling of the pretreatment platelet count and/or two successive 10- to 120-minute posttransfusion CCIs > or = 7500. Following plasma treatments, 6 of 10 patients responded with daily platelet counts that averaged 48 +/− 11 × 10(9) per L as compared with counts of 16 +/− 7 × 10(9) per L (p < 0.0005) before treatment. Posttransfusion CCI values determined in four of these patients averaged 2480 +/− 810 and 10,010 +/− 3540 (p < 0.005) before and after treatment, respectively. In contrast, among the four unresponsive patients, platelet counts averaged 10 +/− 9 and 13 +/− 10 × 10(9) per L (p = NS), respectively, while posttransfusion CCIs were 700 +/− 1410 and 1520 +/− 2460 (p = NS), respectively.(ABSTRACT TRUNCATED AT 250 WORDS)  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