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   192950篇
  免费   1864篇
  国内免费   164篇
耳鼻咽喉   1355篇
儿科学   7071篇
妇产科学   3156篇
基础医学   18609篇
口腔科学   1943篇
临床医学   13392篇
内科学   35698篇
皮肤病学   972篇
神经病学   17540篇
特种医学   9663篇
外科学   31773篇
综合类   2371篇
预防医学   18499篇
眼科学   2974篇
药学   10575篇
中国医学   657篇
肿瘤学   18730篇
  2023年   124篇
  2022年   224篇
  2021年   560篇
  2020年   291篇
  2019年   364篇
  2018年   22302篇
  2017年   17640篇
  2016年   19852篇
  2015年   1340篇
  2014年   1335篇
  2013年   1484篇
  2012年   7982篇
  2011年   22123篇
  2010年   19428篇
  2009年   12019篇
  2008年   20458篇
  2007年   22791篇
  2006年   1608篇
  2005年   3295篇
  2004年   4442篇
  2003年   5343篇
  2002年   3544篇
  2001年   586篇
  2000年   708篇
  1999年   454篇
  1998年   483篇
  1997年   430篇
  1996年   290篇
  1995年   277篇
  1994年   272篇
  1993年   231篇
  1992年   222篇
  1991年   255篇
  1990年   274篇
  1989年   237篇
  1988年   192篇
  1987年   147篇
  1986年   121篇
  1985年   131篇
  1984年   97篇
  1983年   93篇
  1982年   82篇
  1981年   43篇
  1980年   76篇
  1979年   43篇
  1978年   40篇
  1974年   44篇
  1938年   60篇
  1932年   56篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Allergic Predisposition Among Infants with Bronchiolitis   总被引:1,自引:0,他引:1  
Allergic predisposition among infants with bronchiolitis was examined. The number of infants with serum IgE exceeding mean +1 SD was 31/70 (44.3%). The rate of positive radioallergosorbent test (RAST) scores of 1 or more to mites, egg white, or milk was 31/71 (43.7%) and that of scores over 2 was 11/71 (15.5%). Eosinophils and/or mast cells were found in their nasal smears on several occasions. These results indicated that allergic predisposition may be observed among infants with bronchiolitis.  相似文献   
52.
53.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
54.
55.
56.

Introduction  

Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies.  相似文献   
57.
58.
The association of bone with the metabolic syndrome and its features, visceral fat accumulation or insulin resistance, remains unclear. We determined visceral and subcutaneous fat areas (V and S) by computed tomography on 187 men (28–83 years) and 125 postmenopausal women (46–82 years) with type 2 diabetes. Men whose V was 100 cm2 or more had significantly lower urinary N-terminal cross-linked telopeptide of type-I collagen (p = 0.005), higher femoral neck bone mineral density (FN-BMD) (p = 0.004), and lower prevalence of vertebral fractures (VFs) (p = 0.04) than controls. Fat mass, V, S, and lean body mass positively correlated with FN-BMD in men and with lumbar (L) and FN-BMD in women. When adjusted for weight, these correlations became negative. Urinary C-peptide positively correlated with FN-BMD in both genders. Multivariate logistic regression analysis adjusted for age, height, weight, L-BMD, duration of diabetes, and diabetes therapies identified V in men and urinary C-peptide in women as factors inversely associated with the presence of VFs [odds ratio (OR) = 0.61 per SD increase, p = 0.04, and OR = 0.32, p = 0.01, respectively]. These findings suggest that, of the components of the metabolic syndrome, body fat in gravity and hyperinsulinemia could increase FN-BMD in diabetic subjects. Visceral fat in men and hyperinsulinemia in women may protect against VFs independent of weight, L-BMD, diabetes duration, or therapies.  相似文献   
59.
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography (PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant potential of esophageal submucosal tumors.  相似文献   
60.
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