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   425篇
  免费   12篇
耳鼻咽喉   7篇
儿科学   18篇
妇产科学   14篇
基础医学   27篇
口腔科学   7篇
临床医学   42篇
内科学   72篇
皮肤病学   79篇
神经病学   20篇
特种医学   6篇
外科学   58篇
综合类   21篇
一般理论   1篇
预防医学   26篇
眼科学   10篇
药学   19篇
肿瘤学   10篇
  2015年   5篇
  2013年   6篇
  2012年   4篇
  2011年   3篇
  2010年   8篇
  2009年   7篇
  2000年   3篇
  1999年   5篇
  1998年   4篇
  1997年   8篇
  1996年   12篇
  1995年   14篇
  1994年   14篇
  1993年   11篇
  1992年   15篇
  1991年   11篇
  1990年   6篇
  1989年   8篇
  1988年   6篇
  1987年   13篇
  1986年   5篇
  1985年   19篇
  1984年   5篇
  1983年   5篇
  1982年   10篇
  1981年   11篇
  1980年   4篇
  1979年   6篇
  1978年   5篇
  1977年   6篇
  1976年   4篇
  1975年   7篇
  1974年   4篇
  1971年   6篇
  1970年   6篇
  1969年   3篇
  1968年   5篇
  1967年   4篇
  1965年   4篇
  1963年   3篇
  1962年   2篇
  1961年   2篇
  1959年   17篇
  1958年   24篇
  1957年   16篇
  1956年   28篇
  1955年   18篇
  1954年   11篇
  1949年   9篇
  1948年   7篇
排序方式: 共有437条查询结果,搜索用时 15 毫秒
1.
2.
3.
Background. Extensive questioning of patients with a wide variety of skin disorders led to the impression that nocturnal overheating was probably an important factor in the initiation and the perpetuation of many skin disorders. Methods. In order to test the hypothesis, 12 “clean-skinned” subjects (6M/6F) aged 18 to 45 years were monitored electronically every 30 seconds during an 8 hour sleep period (2300 to 0700 hours), sleeping under a standard 10 tog duvet. Results. All the subjects were too hot by 3 to 4°C. All showed changes in their EEG patterns with reduced REM sleep, increased awakenings, and all showed changes in their sleep stage patterns. In addition, they all showed evidence of increased sweating in the “heat-sink” area. Conclusions. The mechanisms where by such changes could be implicated in the precipitation and perpetuation of skin disease are discussed. “Lifestyle” modification as a very effective, noninvasive, therapeutic regime is recommended. Further research along these lines would probably be very valuable and instructive.  相似文献   
4.
ABSTRACT. A child with respiratory distress was found to have been given an antibiotic which was reconstituted with methadone. A delay in standard emergency room management led to a delay in diagnosis and treatment.  相似文献   
5.
The characteristics of all the paediatric admissions made to a district general hospital over a three-year period were analysed in this study. Paediatric admissions averaged 23 per year (10% of the total admissions to the unit over that time). The mean age was six years, median age was four years. Sixty-two per cent were medical admissions and 38% surgical. Forty-seven per cent of the surgical admissions involved head injuries. Seventy-four per cent of medical admissions were directly related to upper and lower airway problems. Mean total admission time was six days, with a median of two days. Fifty-nine per cent (40) of all cases required intubation for a mean period of five days (median = three days). All cases were PRISM scored (Pollack, Ruttimann & Getson 1988). The mean score was 8. Ninety-four percent of admissions surviving to go home. There were a total of four deaths over the three-year period. The PRISM scores of those who died had a mean of 30, which was significantly different (P < 0.05) from the survivors who had a mean PRISM score of six and a median of four. The organs of one of the nonsurvivors were transplanted. Currently there is considerable interest in the feasibility of transferring all paediatric intensive care patients to a regional centre, the consequences of such a policy must be carefully assessed if its implementation is to be a success.  相似文献   
6.
Our experience in using biplane transesophageal echocardiography in the assessment of coarctation of the aorta is described.  相似文献   
7.
8.
9.
10.
Interrelationships between skin and humoral tests for immediate hypersensitivity to wheat and indicators of respiratory disease were examined in 176 male bakers. Skin tests were assessed by measuring the diameter of the weal resulting from prick innoculation of allergen extract and circulating allergen-specific IgE by radioallergosorbent test (RAST). Fifteen per cent of subjects showed positive skin-prick test responses to wheat extracts. These subjects demonstrated an increased prevalence of respiratory symptoms and of measurable bronchial responsiveness to methacholine. Thirty per cent of subjects had positive skin test responses to common allergens but negative responses to whole wheat. Compared to subjects with no positive skin test responses they had an increased prevalence of bronchial responsiveness to methacholine but a similar prevalence of respiratory symptoms. There was a significant association between skin test responses to whole wheat and skin test responses to common allergens suggesting that bakers with pre-existing sensitivity to common allergens are at increased risk of developing wheat flour sensitization. There was no significant difference between skin-prick test and RAST responses to wheat, water-soluble wheat protein and common allergens. Both tests showed similar relationships with indices of respiratory disease. The associations between skin test and RAST responses to wheat extracts and indices of respiratory disease was stronger for the water-soluble wheat proteins than for other wheat grain extracts. These results suggest that immediate hypersensitivity to wheat flour is important in the development of non-specific bronchial hyperreactivity in bakers and that the water-soluble fractions of wheat flour are the most important allergenic components. It agrees with in vitro results showing that water-soluble wheat proteins bind IgE in sensitive bakers more closely than other grain extracts.  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