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   1630篇
  免费   110篇
  国内免费   20篇
耳鼻咽喉   23篇
儿科学   101篇
妇产科学   41篇
基础医学   164篇
口腔科学   69篇
临床医学   186篇
内科学   291篇
皮肤病学   75篇
神经病学   78篇
特种医学   254篇
外科学   183篇
综合类   38篇
预防医学   61篇
眼科学   50篇
药学   49篇
  1篇
肿瘤学   96篇
  2023年   9篇
  2022年   9篇
  2021年   18篇
  2020年   18篇
  2019年   13篇
  2018年   26篇
  2017年   15篇
  2016年   25篇
  2015年   45篇
  2014年   45篇
  2013年   82篇
  2012年   63篇
  2011年   58篇
  2010年   74篇
  2009年   67篇
  2008年   61篇
  2007年   76篇
  2006年   65篇
  2005年   63篇
  2004年   45篇
  2003年   55篇
  2002年   41篇
  2001年   37篇
  2000年   20篇
  1999年   48篇
  1998年   88篇
  1997年   79篇
  1996年   63篇
  1995年   56篇
  1994年   38篇
  1993年   46篇
  1992年   12篇
  1991年   26篇
  1990年   19篇
  1989年   45篇
  1988年   37篇
  1987年   25篇
  1986年   19篇
  1985年   18篇
  1984年   9篇
  1983年   12篇
  1982年   15篇
  1981年   14篇
  1980年   15篇
  1979年   3篇
  1978年   13篇
  1977年   11篇
  1976年   10篇
  1975年   8篇
  1954年   1篇
排序方式: 共有1760条查询结果,搜索用时 0 毫秒
1.
2.
3.
Pyomyositis: characteristics at CT and MR imaging   总被引:9,自引:0,他引:9  
Gordon  BA; Martinez  S; Collins  AJ 《Radiology》1995,197(1):279
  相似文献   
4.
5.
BACKGROUND: Diagnosis of atopic dermatitis (AD) depends on clinical features because no definitive diagnostic test exists. Criteria proposed by Hanifin and Rajka (Acta Derm Venereol (Stockh) 1980; Suppl 92: 44-47) were acceptable for hospital-based studies but were found not to be suitable for field studies. A UK working party formulated clinical diagnostic criteria that could be used in both hospital and epidemiological settings. Validation studies of the criteria showed widely variable results, probably due to different clinical settings and ethnicity. AIM AND OBJECTIVE: This study was undertaken to validate Hanifin and Rajka's criteria and to assess the comparative efficacy of their criteria and the UK working party's diagnostic criteria in the diagnosis of AD in a hospital setting in North India. SUBJECTS AND METHODS: This study serially included 101 patients with AD and 48 controls of paediatric age group. The study period was from July 2003 to December 2004. RESULTS: Hanifin and Rajka's criteria (sensitivity 96%, specificity 93.75%, positive predictive value 97% (PPV) and negative predictive value (NPV) 91.84%) had a statistical advantage over the UK working party's diagnostic criteria (sensitivity 86%, specificity 95.83%, PPV 97.75% and NPV 76.67%), with a P-value < 0.005.  相似文献   
6.
7.
SUMMARY Impotence is a common symptom which can cause considerable distress to both the sufferer and his partner. The use of pharmacotherapy to improve erectile function will continue to increase as safe and effective drugs are developed. However, restoring erectile function should not be the only treatment objective. It is also essential to address personal and emotional factors in the sufferer, conflicts in his relationship with his partner, and sexual problems in his partner, all of which may be instrumental in causing or maintaining the presenting impotence. We advocate a combined approach with appropriate medical treatment and sex and couple therapy  相似文献   
8.
Diethyl maleate (DEM) which binds and thus depletes tissue glutathione levels was used to aggravate the injury and to determine its effect on incisional healing. A 5 cm dorsal midline skin incision was performed on 40 albino Wistar rats in two groups and then closed by interrupted sutures. Groups received 0.9% NaCl and DEM at a dosage of 1 mg/kg/day intraperitoneally for seven days, respectively. On postoperative days 7 and 14, histopathological assessment and tensile strengths were measured. The DEM treated group had a marked inflammation with poorly defined collagen formation and the tensile strength measurements revealed a significant decrease (p <0.001) on the 7t day. On the other hand, the first group showed better collagenization and a lesser degree of inflammation. However, on the 14th day, there was no noticeable histopathological difference between the two groups; but, tensile strength values of the second group were still lower (p <0.05). In this animal model, DEM postponed the healing process and reduced the tensile strength.  相似文献   
9.
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