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   2350篇
  免费   281篇
  国内免费   27篇
耳鼻咽喉   27篇
儿科学   91篇
妇产科学   73篇
基础医学   185篇
口腔科学   71篇
临床医学   309篇
内科学   446篇
皮肤病学   129篇
神经病学   121篇
特种医学   167篇
外科学   456篇
综合类   134篇
现状与发展   30篇
一般理论   3篇
预防医学   175篇
眼科学   25篇
药学   97篇
中国医学   3篇
肿瘤学   116篇
  2024年   18篇
  2023年   189篇
  2022年   23篇
  2021年   29篇
  2020年   64篇
  2019年   45篇
  2018年   68篇
  2017年   65篇
  2016年   62篇
  2015年   75篇
  2014年   110篇
  2013年   89篇
  2012年   80篇
  2011年   81篇
  2010年   106篇
  2009年   113篇
  2008年   83篇
  2007年   120篇
  2006年   85篇
  2005年   68篇
  2004年   80篇
  2003年   71篇
  2002年   69篇
  2001年   29篇
  2000年   33篇
  1999年   42篇
  1998年   52篇
  1997年   71篇
  1996年   60篇
  1995年   49篇
  1994年   44篇
  1993年   45篇
  1992年   29篇
  1991年   30篇
  1990年   25篇
  1989年   39篇
  1988年   32篇
  1987年   23篇
  1986年   17篇
  1985年   21篇
  1984年   10篇
  1982年   10篇
  1981年   13篇
  1980年   18篇
  1979年   12篇
  1978年   11篇
  1976年   15篇
  1975年   16篇
  1974年   12篇
  1973年   13篇
排序方式: 共有2658条查询结果,搜索用时 0 毫秒
1.
2.
This study was conducted to follow up healthy subjects from a previous study (Warwick & Williams, 1987) in which favourable dietary changes were achieved during 1 week immediately after dietary advice but were accompanied by reduced energy intakes and weight loss. Twenty-one subjects (8m, 13f; 57 per cent of the original group) participated in the follow-up study. Dietary intakes were measured using 7-d weighed records on three occasions: before, immediately after and 1 year after receiving dietary advice. Intakes 1 year after dietary advice continued to show some of the favourable changes observed immediately after the advice but were not accompanied by reduced energy intakes and weight loss. Intakes before, immediately after, and 1 year after dietary advice respectively were: energy, 9.0, 7.8 and 8.9 MJ/d (2150, 1860 and 2120 kcal/d); fat, 36.9, 32.9 and 31.5 per cent of total energy; carbohydrate, 44.2, 47.9 and 49.6 per cent of total energy; dietary fibre, 32, 36 and 36 g/d; sodium, 116, 97 and 110 mmol/d; and Na:K ratio, 1.4, 1.2 and 1.2 mmol. Nutrient densities for fibre and most micronutrients tended to be higher 1 year after dietary advice than before, but were highest immediately after the advice. Nutrient densities for sodium and total sugars did not vary between the 3 study weeks. It was concluded that our healthy subjects adapted their intakes to maintain energy balance while retaining favourable dietary changes for at least 1 year after dietary advice.  相似文献   
3.
4.
Hysterosalpingography was performed in 31 patients by means of a low-dose scanning-beam digital radiographic system. The technique permits adequate evaluation of gynecologic abnormalities while allowing significant reduction in radiation: 2.4-mR (6.1 X 10(-7) C/kg) exposure to the skin and 0.7-mrad (7 X 10(-6) Gy) mean dose to the ovaries per image obtained. Sixteen patients demonstrated readily recognizable and documented abnormalities, corroborated by laparoscopy, laparotomy, or other supportive evidence.  相似文献   
5.
6.
Sixteen males with stress incontinence due to sphincter damage were investigated with videourodynamic studies after implantation of a perineal artificial urinary sphincter. Twelve patients were rendered dry; 4 remained incontinent, all of whom were shown by cystometry to have incontinence from detrusor instability. Of these, 2 also had stress incontinence proven by videourography. Detrusor instability was present in 9 patients before implantation; the instability worsened considerably in 2 patients and new instability was shown in another 2 patients. The limitations of the artificial urinary sphincter and the implications of detrusor instability in patients with an artificial sphincter are discussed. The artificial urinary sphincter is an extremely successful device for the treatment of acquired stress incontinence.  相似文献   
7.
Defecography in multiple sclerosis patients with severe constipation   总被引:3,自引:0,他引:3  
Gill  KP; Chia  YW; Henry  MM; Shorvon  PJ 《Radiology》1994,191(2):553
  相似文献   
8.
9.
The effect of subhypnotic doses of propofol on intrathecal morphine-induced pruritus was studied in a prospective, randomly allocated, double-blind controlled trial. Fifty-eight women undergoing elective lower segment Caesarean section for a singleton fetus received spinal anaesthesia with 2.5 ml hyperbaric 0.5% bupivacaine and 0.2 mg of preservative-free morphine. They then received propofol 1 ml (10 mg) or Intralipid 1 ml (control group) intravenously after delivery. Pruritus was assessed using a five-point verbal rating scale at hourly intervals for 8 h. A second dose of their allocated treatment drug was administered at the first recording of significant pruritus. The pruritus score was reassessed after 5 min and the treatment was repeated if pruritus remained. There were no differences between the groups in the onset of pruritus or its successful treatment. No adverse side-effects were associated with this dose of propofol. There were no differences in the incidence of post-operative nausea and vomiting between the two groups. Subhypnotic propofol is not an effective treatment for intrathecal morphine-induced pruritus in women following Caesarean section.  相似文献   
10.
BACKGROUND: The mainstay of treatment for pemphigus is systemic corticosteroids. Different adjuvants have been used to reduce side-effects of long-term corticotherapy. Gold is an anti-inflammatory drug used in autoimmune diseases, whose use has waned with the advent of new immunosuppressive agents. OBJECTIVE: To study the outcome of the use of intramuscular gold treatment of pemphigus vulgaris refractory to previous therapies. METHODS: Thirteen patients with pemphigus vulgaris who had failed to respond to several prior therapies were treated with aurothiomalate, as a steroid-sparing agent. Patients were monitored to assess disease activity and gold toxicity. RESULTS: Seven patients achieved complete remission. Four patients were able to taper prednisone doses, although pemphigus flared when prednisone was discontinued or reduced. Toxicity was observed in the other two patients. CONCLUSIONS: In 53.4% of the patients, the use of chrysotherapy resulted in the complete clearing of the disease, discontinuation of all systemic therapies and induced a long-term clinical remission. Prednisone doses were able to be reduced in the remaining 46.6%. Any side-effects were reversible with drug discontinuation. Gold therapy showed efficacy as a secondary line treatment in refractory pemphigus vulgaris.  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