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   747635篇
  免费   57370篇
  国内免费   1551篇
耳鼻咽喉   9594篇
儿科学   24212篇
妇产科学   18299篇
基础医学   117267篇
口腔科学   21379篇
临床医学   68611篇
内科学   145219篇
皮肤病学   17062篇
神经病学   52838篇
特种医学   27686篇
外国民族医学   76篇
外科学   112827篇
综合类   15211篇
现状与发展   2篇
一般理论   176篇
预防医学   55556篇
眼科学   17114篇
药学   56169篇
  4篇
中国医学   2420篇
肿瘤学   44834篇
  2021年   6435篇
  2019年   6161篇
  2018年   8877篇
  2017年   6831篇
  2016年   7741篇
  2015年   8869篇
  2014年   12277篇
  2013年   18248篇
  2012年   22591篇
  2011年   23580篇
  2010年   14640篇
  2009年   13905篇
  2008年   21739篇
  2007年   23055篇
  2006年   23524篇
  2005年   21907篇
  2004年   21268篇
  2003年   20062篇
  2002年   19523篇
  2001年   36913篇
  2000年   37383篇
  1999年   31077篇
  1998年   8762篇
  1997年   7499篇
  1996年   7813篇
  1995年   7425篇
  1994年   6777篇
  1993年   6202篇
  1992年   23598篇
  1991年   23523篇
  1990年   22835篇
  1989年   22651篇
  1988年   20650篇
  1987年   20008篇
  1986年   19034篇
  1985年   17885篇
  1984年   13226篇
  1983年   11245篇
  1982年   6483篇
  1979年   12007篇
  1978年   8601篇
  1977年   7312篇
  1976年   7013篇
  1975年   7644篇
  1974年   8855篇
  1973年   8472篇
  1972年   7976篇
  1971年   7417篇
  1970年   7121篇
  1969年   6522篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
981.
982.
Adie's syndrome as a cause of amblyopia   总被引:3,自引:0,他引:3  
Adie's syndrome comprises a tonic pupil, which may be associated with impairment of accommodation, in the presence of diminished or absent deep tendon reflexes. We report a case of a 4-year-old boy with Adie's syndrome in which latent hypermetropia was made manifest by accommodative paresis and resulted in reversible amblyopia.  相似文献   
983.
BACKGROUND: Little is known about time trends of allergic respiratory disease in adults, in particular in older adults. Furthermore, few trend studies have used objective measurements of IgE sensitization against inhalant allergens. OBJECTIVES: To investigate time trends of aeroallergen sensitization in adults over a 25-year period. METHODS: The study includes a total of 7820 persons, aged 30, 40, 50, and 60 years, who participated in three repeated cross-sectional studies of the general population of Copenhagen, Denmark, in 1976-1977, 1982-1984, and 1999-2001, respectively. Respiratory allergy was assessed by determination of specific IgE aeroallergen sensitization in stored serum samples. RESULTS: Over this 25-year period, a marked and statistically significant increase in the prevalence of aeroallergen sensitization had occurred. This increase was seen in all age-groups challenging the notion that the allergy epidemic only affects generations born 1960 onwards. For example, in 40-year-olds the prevalence (with 95% confidence intervals) of aeroallergen sensitization was 14.9% (12.7-17.1), 19.7% (17.1-22.3), and 27.6% (25.1-30.1) in 1976-1977, 1982-1984, and 1999-2001, respectively. CONCLUSIONS: Our results support that the allergy epidemic has spread to older adults resulting in a continuing increase in the overall prevalence of aeroallergen sensitization and an increase in the mean age of allergic patients.  相似文献   
984.
985.
986.
Seven eyes of seven patients with visually disabling postkeratoplasty astigmatism underwent arcuate keratotomy to reduce astigmatism. Keratotomy length was prospectively determined by comparing the corneal shape change needed by each patient with shape changes in cadaver eyes induced by arcuate keratotomy. Keratograph ring ovality quantified corneal shape change. Keratotomies were placed in the wound interface using a diamond knife with blade length set to 100% of corneal thickness. Prekeratotomy keratometric astigmatism was 9.27 +/- 2.14 D (mean +/- SD), and at 2.0 to 18.4 months after keratotomy, astigmatism was 2.75 +/- 2.25 D (mean +/- SD). All corneas had decreased keratometric astigmatism and less oval keratoscope rings. Five corneas had 3.00 D or less residual keratometric astigmatism. Change in ring ovality was significantly correlated with keratotomy length and keratometric astigmatism change. The utility of keratoscope ring ovality as a corneal topography metric was demonstrated by systematically investigating the response to arcuate keratotomy.  相似文献   
987.
The paper describes positive results after treatment of 15 patients with severe forms of uveitis by means of administering preparations into the portal vein of the eye. The method was substantiated by a series of experimental investigations. The treatment of patients with uveitis was prescribed when common therapy within a week and in some cases--a month after beginning of treatment proved to be ineffective. In 8 eyes with endogenous uveitis visual acuity rose from 0.06 +/- 0.4 at admission to 0.28 +/- 0.7 at discharge. In 4 patients with supposed enucleation of the eye the proposed method allowed to stop the inflammatory process. This method permitted to shorten the term of the patients stay at the hospital by 6.8 days. No complications during the treatment of recurrences in remote period were recorded.  相似文献   
988.
This paper summarises the information given on the 1986 EDTA Registry centre questionnaire which was returned by 82% of the 2,065 known dialysis and transplant centres in 33 European countries. Information is given on the number of patients alive on haemodialysis according to the type of dialysis facilities available where the patient was receiving dialysis and the number of patients receiving special types of dialysis. The centre questionnaire also included questions on testing for HIV infection, serological evidence or symptoms of AIDS and the diagnosis of hepatitis B in patients and staff. The data given in response to these questions are presented together with data on the involvement of dietitians and social workers in the treatment of patients with end stage renal failure. Finally, information on transplant activity in Europe and the treatment policies of transplanting centres is provided.  相似文献   
989.
990.
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