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   83163篇
  免费   8201篇
  国内免费   156篇
耳鼻咽喉   1181篇
儿科学   2550篇
妇产科学   1793篇
基础医学   11882篇
口腔科学   2008篇
临床医学   10217篇
内科学   14681篇
皮肤病学   1312篇
神经病学   6754篇
特种医学   2844篇
外国民族医学   10篇
外科学   11420篇
综合类   1668篇
一般理论   67篇
预防医学   9484篇
眼科学   1851篇
药学   6768篇
  1篇
中国医学   78篇
肿瘤学   4951篇
  2021年   1111篇
  2020年   738篇
  2019年   1122篇
  2018年   1397篇
  2017年   1011篇
  2016年   1098篇
  2015年   1254篇
  2014年   1640篇
  2013年   2588篇
  2012年   3476篇
  2011年   3752篇
  2010年   2011篇
  2009年   1923篇
  2008年   3237篇
  2007年   3545篇
  2006年   3420篇
  2005年   3482篇
  2004年   3250篇
  2003年   3022篇
  2002年   2962篇
  2001年   2721篇
  2000年   2828篇
  1999年   2510篇
  1998年   1084篇
  1997年   901篇
  1996年   885篇
  1995年   805篇
  1994年   825篇
  1993年   768篇
  1992年   2097篇
  1991年   2025篇
  1990年   1908篇
  1989年   1870篇
  1988年   1780篇
  1987年   1783篇
  1986年   1691篇
  1985年   1673篇
  1984年   1387篇
  1983年   1258篇
  1982年   842篇
  1981年   727篇
  1979年   1214篇
  1978年   876篇
  1977年   765篇
  1976年   725篇
  1975年   717篇
  1974年   859篇
  1973年   752篇
  1972年   733篇
  1971年   640篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
31.
The purpose of this qualitative study was to examine the process of transformation of personal beliefs, values, feelings, and knowledge (meaning perspectives) underlying occupational change in a small group of clients with rheumatoid arthritis during home-based rehabilitation. A grounded theory approach used to collect and analyze data concurrently included: (1) a sample of five adult clients diagnosed with rheumatoid arthritis in occupational therapy, (2) data collection through 28 semi-directed interviews, and (3) data analysis using the constant comparison method. The study identified meaning perspectives of these clients with rheumatoid arthritis and explored the transformation of perspectives related to the modification of occupational performance. The study suggests that the exploration of meaning perspective transformation by clients and therapists could be a potential part of rehabilitation intervention.  相似文献   
32.
Trace element status in multiple sclerosis   总被引:1,自引:0,他引:1  
We compared trace element status in multiple sclerosis (MS) patients (n = 27) with and without treatment with corticosteroids and groups of healthy subjects. Concentrations of plasma ceruloplasmin, selenium, and zinc and erythrocyte (RBC) glutathione peroxidase, Se, and Zn were similar in all groups. RBC copper concentrations were significantly lower in MS patients than in control subjects (mean +/- SEM: 0.048 +/- 0.005 vs 0.060 +/- 0.002 mumol/g Hb) because of decreased RBC Cu with steroid therapy. RBC Zn-Cu ratios were significantly higher (14.9 +/- 1.0 vs 10.1 +/- 0.3) in MS patients than in control subjects, differing in both groups of MS patients. In MS and control subjects, RBC Cu correlated significantly with RBC Zn (r = 0.56, 0.49). Disease acuity and disability had no effect on trace-mineral status. These data suggest that in MS there is altered Cu and Zn homeostasis that may cause or result from the disease and is influenced by corticosteroid therapy. Systemic trace element alterations might provide clinically useful markers of MS.  相似文献   
33.
A case of poisoning with 100 mg of oxybutynin in a 34-year-old female is reported. The main features were anticholinergic effects, including stupor, followed by disorientation and agitation on awakening, dilated pupils, dry skin and retention of urine. She had a sinus tachycardia which resolved 3 h after admission, and in addition ventricular ectopics and bigeminy which continued for a further 30 h. She recovered fully on symptomatic treatment alone.  相似文献   
34.
The emergence of a near-haploid clone of cells in blast phase chronic myelogenous leukemia is an unusual event. We report such a case and review eight other cases described in the English literature. The significance of the substantial loss of genetic material is discussed as is the phenotypic and genotypic heterogeneity observed in this group of patients.  相似文献   
35.
36.
37.
Argon laser pretreatment in Nd: YAG iridotomy   总被引:1,自引:0,他引:1  
Argon laser pretreatment prior to Nd:YAG laser iridotomy may decrease the incidence of operative hemorrhage. In a prospective, randomized clinical trial involving 12 patients (24 eyes), one eye was randomly assigned treatment with the Nd:YAG laser alone, while the other eye was pretreated with argon laser photocoagulation immediately prior to Nd:YAG laser. Eight of the 12 eyes (67%) treated with Nd:YAG laser alone had operative hemorrhages; only 2 of the 12 (17%) pretreated eyes did. Thus, argon laser pretreatment significantly reduced the incidence of hemorrhage during Nd:YAG iridotomy (P = .012).  相似文献   
38.
We estimated body fat in 20 normal adults (10 males and 10 females) from 18O- and 2H-dilution spaces and from the equations of Durnin & Womersley and Pollock, Schmidt & Jackson based on skinfold thickness measurements. Differences between methods for body fat estimation were found to be sex-dependent: subsequent analyses indicated significant differences between methods within each sex. Regardless of sex, the highest fat estimates were obtained with the 18O-dilution method, followed by those obtained with the 2H-dilution method or the Durnin & Womersley equation. The lowest fat estimates were obtained using the Pollock, Schmidt & Jackson equation. The 18O-dilution method and the Durnin & Wormersley anthropometric method are both suitable and appropriate for body fat estimation in adults studied under field conditions.  相似文献   
39.
40.
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