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   9507篇
  免费   467篇
  国内免费   85篇
耳鼻咽喉   69篇
儿科学   225篇
妇产科学   303篇
基础医学   961篇
口腔科学   175篇
临床医学   813篇
内科学   2561篇
皮肤病学   67篇
神经病学   962篇
特种医学   458篇
外科学   1481篇
综合类   22篇
一般理论   3篇
预防医学   378篇
眼科学   134篇
药学   584篇
中国医学   19篇
肿瘤学   844篇
  2023年   53篇
  2022年   161篇
  2021年   277篇
  2020年   147篇
  2019年   242篇
  2018年   303篇
  2017年   231篇
  2016年   246篇
  2015年   282篇
  2014年   384篇
  2013年   476篇
  2012年   752篇
  2011年   724篇
  2010年   382篇
  2009年   402篇
  2008年   578篇
  2007年   570篇
  2006年   577篇
  2005年   580篇
  2004年   520篇
  2003年   492篇
  2002年   444篇
  2001年   104篇
  2000年   90篇
  1999年   99篇
  1998年   90篇
  1997年   92篇
  1996年   73篇
  1995年   57篇
  1994年   50篇
  1993年   33篇
  1992年   58篇
  1991年   42篇
  1990年   49篇
  1989年   28篇
  1988年   43篇
  1987年   31篇
  1986年   34篇
  1985年   33篇
  1984年   23篇
  1983年   28篇
  1982年   26篇
  1981年   23篇
  1980年   18篇
  1979年   9篇
  1978年   12篇
  1977年   10篇
  1974年   8篇
  1972年   13篇
  1968年   7篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
The physical and physico-chemical properties of several Kabuli chickpeas originating from Sicily (South Italy) were determined. Twelve genotypes in all, including two controls (ILC484, of the ICARDA genebank, and ‘Calia’, a traditional Italian cultivar), were analysed. A large variability among genotypes was ascertained for swelling capacity (coefficient of variation [CV]=27.9%), swelling index (CV=30.5%) and calcium content (CV=39.3%). The lowest variability was observed for seed coat (CV=8.6%) and seed weight (CV=9.6%). Genotype statistically affected all traits, whose mean values were: seed weight, 0.340±0.03 g; seed coat, 4.47±0.38%; seed volume, 0.292±0.04 ml; seed density, 1.18±0.15 g/ml; hydration capacity, 0.361±0.09 g/seed; hydration index, 1.05±0.21; swelling capacity, 0.346±0.10 ml/seed; swelling index, 1.21±0.37; cooking texture, 2.61±0.38 kg/cm2; and calcium, 109.6±43.11 mg/100 g dry weight. Correlation coefficients among characteristics were also estimated. The genotype ‘44M33’ was found to be interesting having good seed weight and low seed coat incidence and calcium content, all important attributes affecting cooking quality.  相似文献   
65.
66.
67.
Crohn's disease is a chronic, inflammatory disease of the gastrointestinal tract, affecting both children and adults. Extracorporeal photopheresis (ECP) has been used in steroid dependent adults with moderate to severely active Crohn's disease, with response rates up to 50%, with up to 25% complete responses. A 12‐year‐old male patient had severe unremitting Crohn's disease for one year, despite treatment with anti‐inflammatory, immunosuppressive, and biologic agents. He failed elemental enteral nutrition and required total parenteral nutrition (TPN). A diverting colostomy for perforation was required. He required frequent hospitalizations and required homebound schooling. Endoscopy revealed severe inflammation and ulcerations of the entire colon. ECP was begun twice weekly for 4 weeks, then twice per week every 14 days for a total of 28 weeks. ECP was well tolerated and prednisone was gradually discontinued. He continued daily azathioprine and infliximab at 6 week intervals. TPN was weaned as enteral intake improved. Disease abatement allowed a return to school and normal activities. Endoscopy at completion of ECP course revealed normal upper tract, normal ano‐rectum, and decreased, although significant, colonic disease. This response has continued for at least 16 months since completion of ECP. We conclude that ECP is useful for pediatric patients with steroid dependent Crohn's disease and prospective evaluation is warranted. J. Clin. Apheresis 28:381–386, 2013. © 2013 Wiley Periodicals, Inc.  相似文献   
68.
69.
Purpose : This study evaluates the negative effects of atrial fibrillation (AF) on after stroke recovery and its relationship with age and other concomitant diseases. Method : One hundred and ninety-nine consecutive inpatients, after their first stroke, were enrolled and entered a rehabilitation program lasting 60 days. The mean interval since the stroke was 19 days. The disability, both at admission and at discharge, was assessed by Functional Independence Measure (FIM). Atrial fibrillation was diagnosed at admission on the basis of electrocardiographic recordings. Gender, age, blood pressure and blood sugar level were also taken into account. Results : Stroke patients suffering from AF, when compared to those lacking AF, have higher disability at admission as well as at discharge and had a lesser gain in functional recovery. No statistical difference of the AF occurrence was found between male and female patients. The negative correlation between age and functional gain was found only in AF patients. There was also a significant association between AF and hypertension, but not between AF and diabetes. At the beginning and at the end of the study, the median FIM scores of all the patients with AF were quite similar irrespective of manifesting hypertension, diabetes or neither of these two. Conclusions : The presence of AF has a negative prognostic value on post stroke outcome, particularly in the elderly patients. The pattern of recovery of stroke subjects having AF is not influenced by concomitant diseases like hypertension or diabetes.  相似文献   
70.
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