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   1800篇
  免费   81篇
  国内免费   11篇
耳鼻咽喉   6篇
儿科学   69篇
妇产科学   40篇
基础医学   179篇
口腔科学   35篇
临床医学   99篇
内科学   350篇
皮肤病学   62篇
神经病学   43篇
特种医学   120篇
外科学   309篇
综合类   288篇
预防医学   112篇
眼科学   40篇
药学   65篇
中国医学   3篇
肿瘤学   72篇
  2022年   13篇
  2021年   22篇
  2020年   13篇
  2019年   25篇
  2018年   23篇
  2017年   20篇
  2016年   15篇
  2015年   49篇
  2014年   32篇
  2013年   52篇
  2012年   52篇
  2011年   59篇
  2010年   80篇
  2009年   71篇
  2008年   65篇
  2007年   83篇
  2006年   100篇
  2005年   73篇
  2004年   84篇
  2003年   48篇
  2002年   40篇
  2001年   42篇
  2000年   51篇
  1999年   55篇
  1998年   51篇
  1997年   62篇
  1996年   59篇
  1995年   42篇
  1994年   38篇
  1993年   16篇
  1992年   47篇
  1991年   37篇
  1990年   39篇
  1989年   35篇
  1988年   39篇
  1987年   24篇
  1986年   34篇
  1985年   22篇
  1984年   22篇
  1983年   14篇
  1982年   11篇
  1981年   10篇
  1979年   10篇
  1978年   21篇
  1977年   10篇
  1976年   23篇
  1975年   8篇
  1974年   11篇
  1973年   6篇
  1966年   7篇
排序方式: 共有1892条查询结果,搜索用时 0 毫秒
41.
42.
43.
Malignant phyllodes tumour is an uncommon breast neoplasm which undergoes osteosarcomatous differentiation in 1.3% of cases. We document the plain film, CT and scintigraphic features of a case of pulmonary metastases from this rare primary tumour.  相似文献   
44.
Indian Journal of Pediatrics - To evaluate effect of one year exercise intervention program on bone mineral accrual in children and adolescent with cystic fibrosis (CF). Fifty-two CF children (mean...  相似文献   
45.
46.
Ocular complications of paediatric patients with nephrotic syndrome   总被引:2,自引:0,他引:2  
Purpose : To investigate ocular complications arising from nephrotic syndrome and/or its treatments in children. Methods : A cross‐sectional study was conducted in a teaching hospital. A total of 31 paediatric patients with nephrotic syndrome were studied. Comprehensive ophthalmic assessments on best‐corrected visual acuity, intraocular pressure, slit‐lamp and fundus examination were taken. Information regarding histological diagnosis of nephrotic syndrome and its treatment regimen in each patient was reviewed and analysed. Results : Bilateral posterior subcapsular cataracts were detected in three of 29 patients (10.3%) who received steroid therapy. Two had normal vision while one had visual acuity reduced to 6/15 in both eyes. The age of onset of the nephrotic syndrome in these three patients was 2 years, which was significantly younger than those without cataract (5.4 ± 3.2 years, P < 0.001). Three patients (9.7%) had isolated asymptomatic fundal findings of tortuous and dilated retinal vessels. Hypertensive retinopathy was found in one patient (3.2%). No steroid‐induced glaucoma, uveitis, ocular infection, or other eye complications related to the use of steroids or other immunosuppressive agents were noted. Conclusions : Children who have nephrotic syndrome often require prolonged, intermittent high dose of systemic corticosteroid therapy. Paediatricians should be aware of the potential risk of developing steroid‐related complications, especially posterior subcapsular cataract. It appears to have a higher risk when steroid therapy is used in very young patients. Early detection would help to prevent amblyopia development, particularly in the group of immature eyes.  相似文献   
47.
48.
49.
Rheologic predictors of the severity of the painful sickle cell crisis   总被引:4,自引:0,他引:4  
Ballas  SK; Larner  J; Smith  ED; Surrey  S; Schwartz  E; Rappaport  EF 《Blood》1988,72(4):1216-1223
Deformable sickle erythrocytes have been reported by Mohandas and Evans to be more adherent to vascular endothelium than rigid irreversibly sickled cells (ISC). To define the clinical implications of this finding we have determined genetic, hematological, clinical, and rheological characteristics of sickle erythrocytes obtained from 65 patients with sickle cell anemia and fetal hemoglobin (Hb F) levels less than 15%. The alpha-globin gene number had a significant effect on the hematological parameters, the percentage of dense cells, ISC number, and HB A2 levels. The presence or absence of alpha thalassemia, however, had no effect on the frequency and severity of the sickle cell painful crisis (r = 0.06, P greater than .05). RBC deformability, determined by an ektacytometer, showed great heterogeneity among patients with three or four alpha-globin genes. Linear regression analyses of the data showed significant positive correlation of the frequency and severity of the painful crisis with RBC deformability (r = 0.49, P less than .001), and negative correlations with the percentage of dense cells (r = -0.37, P = .002), and the percentage of ISC (r = -0.46, P less than .001). We propose that the more deformable the sickle RBC are, the greater their adherence to vascular endothelium, and the more they cause vaso-occlusive crises, RBC deformability and the percentage of dense cells (or ISC) seem to have a predictive value of the frequency and severity of painful crises in sickle cell anemia.  相似文献   
50.
Aortopulmonary window is an uncommon congenital cardiac defect. Most infants presenting with aortopulmonary window will require conventional surgical repair. Experience with transcatheter closure of aortopulmonary window is limited. We report the case of a 9-year-old girl with aortopulmonary window, in whom transcatheter closure was performed successfully using Amplatzer ductal occluder device.  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