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   721篇
  免费   26篇
耳鼻咽喉   1篇
儿科学   18篇
妇产科学   13篇
基础医学   74篇
口腔科学   19篇
临床医学   130篇
内科学   175篇
皮肤病学   77篇
神经病学   30篇
外科学   49篇
预防医学   72篇
眼科学   2篇
药学   81篇
肿瘤学   6篇
  2022年   10篇
  2021年   5篇
  2017年   7篇
  2016年   14篇
  2015年   10篇
  2014年   13篇
  2013年   29篇
  2012年   9篇
  2011年   7篇
  2010年   33篇
  2009年   39篇
  2007年   17篇
  2006年   15篇
  2005年   10篇
  2004年   4篇
  2003年   5篇
  2002年   5篇
  2001年   7篇
  2000年   11篇
  1999年   13篇
  1998年   34篇
  1997年   37篇
  1996年   59篇
  1995年   47篇
  1994年   21篇
  1993年   25篇
  1992年   24篇
  1991年   16篇
  1990年   19篇
  1989年   14篇
  1988年   18篇
  1987年   10篇
  1986年   10篇
  1985年   9篇
  1984年   11篇
  1983年   7篇
  1982年   15篇
  1981年   17篇
  1980年   6篇
  1979年   9篇
  1978年   6篇
  1976年   5篇
  1974年   3篇
  1971年   7篇
  1969年   5篇
  1958年   4篇
  1957年   9篇
  1956年   5篇
  1955年   4篇
  1954年   4篇
排序方式: 共有747条查询结果,搜索用时 15 毫秒
741.
Immune complex glomerulonephritis in experimental kala-azar   总被引:3,自引:1,他引:3  
In the present work we demonstrate that hamsters infected with L. donovani eliminate large quantities of immunoglobulins in the urine. This alteration is clearly a consequence of a conspicuous immune complex glomerulonephritis readily detectable 7 days after the beginning of infection. L. donovani antigens and hamsters immunoglobulins (Igs) were revealed as granular deposits in the mesangial areas and contiguous loops of the glomeruli. Histopathological alterations such as focal mesangial proliferation with progression to diffuse proliferation were observed in the first 3 weeks of infection. From day 35 onwards, all diseased animals presented large deposits of amyloid material of predominantly glomerular localization. In consonance with these alterations, Igs were detected in the urine by day 21 of infection and their concentration increased substantially with the progression of disease. In contrast, serum Igs increased until day 21, when their concentration dropped steadily.  相似文献   
742.
SUMMARY. A survey of dermatological out-patients in 2 large Glasgow hospitals from 1955ndash;64 is reported.
The incidence of common diseases is analyzed in detail and changes in incidence are indicated and discussed. *
Earlier surveys in Glasgow and comparable recent surveys in other cities are reviewed.
The need for an internationally acceptable nomenclature for common diseases, without unproven aetiological implications, is emphasized.  相似文献   
743.
Indirect immunofluorescence(IIF) and double immunodiffusion (DID) were performed on the sera of 64 patients who had a nucleolar immunofluorescence pattern on HEp-2 cells. Forty-nine of the sera were from 296 patients with systemic scleroderma (SSc) and 15 sera were from 214 patients with systemic lupus erythematosus (SLE). A homogeneous nucleolar staining pattern was found in 45 of the 64 sera (70.3%), a clumpy fluorescence associated with fibrillarin antibody in 14 (21.8%) and a speckled pattern was found in five of the sera (7.8%). There was a clear correlation between the sera which showed a homogeneous nucleolar staining pattern with symptoms of the polymyositis/scleroderma overlap syndrome that differed from SSc with concomitant myositis. The clumpy pattern was mainly associated with diffuse scleroderma and the speckled pattern with limited scleroderma (previously called acrosclerosis).  相似文献   
744.
745.
746.
A table which provides light, vibration, or sound stimulation on completion of form board tasks is described. Questions relating to the evaluation of such equipment are discussed.  相似文献   
747.
A table, which provides sensory reinforcement on completion of form board tasks, was evaluated for use in teaching and occupying severely mentally handicapped children. Sensory stimulation was found to be more effective than edibles or social reinforcement in occupying two children working at skills already acquired. The addition of sensory reinforcement to social reinforcement was found to enhance learning new skills in three children. Sensory stimulation was no more effective than conventional reinforcers with five children whose performance at form board tasks was generally very low. It is suggested that the use of such equipment be investigated further with larger numbers of children.  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