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   583篇
  免费   40篇
  国内免费   13篇
儿科学   43篇
妇产科学   4篇
基础医学   66篇
口腔科学   29篇
临床医学   62篇
内科学   143篇
皮肤病学   18篇
神经病学   32篇
特种医学   95篇
外科学   32篇
综合类   5篇
预防医学   42篇
眼科学   13篇
药学   21篇
肿瘤学   31篇
  2022年   9篇
  2021年   7篇
  2020年   8篇
  2019年   7篇
  2018年   7篇
  2017年   12篇
  2016年   10篇
  2015年   15篇
  2014年   10篇
  2013年   21篇
  2012年   23篇
  2011年   14篇
  2010年   27篇
  2009年   17篇
  2008年   13篇
  2007年   29篇
  2006年   21篇
  2005年   19篇
  2004年   15篇
  2003年   17篇
  2002年   15篇
  2001年   9篇
  2000年   30篇
  1999年   8篇
  1998年   28篇
  1997年   41篇
  1996年   32篇
  1995年   20篇
  1994年   16篇
  1993年   9篇
  1992年   9篇
  1991年   2篇
  1990年   6篇
  1989年   12篇
  1988年   15篇
  1987年   7篇
  1986年   7篇
  1985年   8篇
  1984年   2篇
  1983年   12篇
  1982年   7篇
  1981年   5篇
  1980年   5篇
  1979年   5篇
  1978年   4篇
  1977年   12篇
  1976年   4篇
  1975年   3篇
  1973年   1篇
  1970年   1篇
排序方式: 共有636条查询结果,搜索用时 15 毫秒
41.
42.
OBJECTIVE: To examine psychometric properties of the Confidence in Diabetes Self-Care (CIDS) scale, a newly developed instrument assessing diabetes-specific self-efficacy in Dutch and U.S. patients with type 1 diabetes. RESEARCH DESIGN AND METHODS: Reliability and validity of the CIDS scale were evaluated in Dutch (n = 151) and U.S. (n = 190) outpatients with type 1 diabetes. In addition to the CIDS scale, assessment included HbA(1c), emotional distress, fear of hypoglycemia, self-esteem, anxiety, depression, and self-care behavior. The Dutch sample completed additional measures on perceived burden and importance of self-care. Test-retest reliability was established in a second Dutch sample (n = 62). RESULTS: Internal consistency (Cronbach's alpha = 0.86 for Dutch patients and 0.90 U.S. patients) and test-retest reliability (Spearman's r = 0.85, P < 0.0001) of the CIDS scale were high. Exploratory factor analysis showed one strong general factor. Spearman's correlations between the CIDS scale and other measures were moderate and in the expected directions, and high HbA(1c) levels were associated with low CIDS scores in the U.S. sample only. Low CIDS scores were positively associated with self-care but not with glycemic control in the original samples. CIDS scores in the U.S. and Dutch samples did not show any statistically significant differences. U.S. men had higher CIDS scores than U.S. women. CONCLUSIONS: The CIDS scale is a reliable and valid measure of diabetes-specific self-efficacy for use in patients with type 1 diabetes. High psychometric similarity allows for cross-cultural comparisons.  相似文献   
43.
The aim of this project was to develop a standardized, valid and reliable instrument for determining needs of patients and quality of care as perceived by patients. A questionnaire was constructed based upon the Service Quality Model. This model, patient expectations and experiences all play an important role in the questionnaire. The questionnaire contains a general part which includes ten determinants of care, the information the patient got and the perceived quality of care in general. The questionnaire also contains a specific part which includes questions about the actual care for diagnosis related problems. Twenty-four spinal cord injured patients, staying at a Dutch rehabilitation centre, participated in this study. It is concluded that with the developed questionnaire the perceived quality of care according to the Service Quality Model can be assessed. Major contributions of the questionnaire to rehabilitation care will be its ability to highlight patient needs related to identified symptoms, and to provide a tool to signal aspects in the organization that can be improved. Thus it becomes a tool for quality management. Recommendations have been made for further research to make future use of the questionnaire in other settings and populations possible.  相似文献   
44.
The myeloid zinc finger gene, MZF-1, regulates the CD34 promoter in vitro   总被引:2,自引:1,他引:2  
Morris  JF; Rauscher  FJ rd; Davis  B; Klemsz  M; Xu  D; Tenen  D; Hromas  R 《Blood》1995,86(10):3640-3647
  相似文献   
45.
The early clinical experience with a 3-Dimensional Fourier Transform Gradient Echo sequence with fat suppression in the evaluation of breast masses is reported. Ten female patients with breast malignancies were pre-operatively evaluated with this sequence and the results compared with the pathological specimens. The scanning protocol included a noncontrast sequence followed by an immediate post-contrast sequence (completed 4.5 min after intravenous contrast injection) and a delayed sequence. Images were assessed for maximum lesion and parenchymal enhancement, lesion size and additional enhancing abnormalities. In six patients, malignant masses enhanced maximally on the immediate post-contrast sequence with parenchyma enhancing maximally on delayed images. In three cases, there was preferential enhancement of malignant lesions over normal parenchyma but to a similar degree on both post-contrast sequences. In one case, both the lesion and parenchyma enhanced maximally on the delayed sequence. Magnetic resonance assessed lesion size accurately and also detected satellite malignancies in one case. However, lesion grade, associated in situ carcinoma and lymphovascular invasion did not impact on lesion enhancement. In this small series, a contrast-enhanced, fat-suppressed 3-D Gradient Echo Sequence detected breast carcinoma with high sensitivity. The technique holds promise but further evaluation is required.  相似文献   
46.
The prevalence of osteopenia in children with inflammatory bowel disease (IBD) is unknown. The effect of nutritional state, disease activity, and steroid therapy on bone mineral content (BMC) of whole body, lumbar spine, and left femoral neck measured by dual energy x ray absorptiometry in 32 children with IBD was assessed by comparison with 58 healthy local school children. Using the control data, a predicted BMC was calculated taking into account bone area, age, height, weight, and pubertal stage. The measured BMC in children with IBD was expressed as a percentage of this predicted value (% BMC). Mean (SD) % BMC was significantly reduced for the whole body and left femoral neck in the children with IBD (97.0 (4.5)% and 93.1 (12.0)% respectively, p < 0.05). Of the children with IBD, 41% had a % BMC less than 1 SD below the mean for the whole body and 47% at the femoral neck. Reduction in % BMC was associated with steroid usage but not with the magnitude of steroid dose, disease activity, or biochemical markers of bone metabolism. In conclusion, osteopenia is relatively common in childhood IBD and may be partly related to the previous use of steroids.  相似文献   
47.
BACKGROUND AND AIM: This study was aimed to identify additional components of metabolic syndrome from a set of cardiovascular risk markers. METHODS AND RESULTS: The homeostasis model assessment of insulin resistance (HOMA-IR), C-reactive protein, fibrinogen, plasminogen activator inhibitor-1 (PAI-1), von Willebrand factor, homocysteine, Haemoglobin A1c (HbA1c), and lipoprotein(a) were assessed in a population-based sample of 902 nondiabetic adult subjects. Those biomarkers that were associated with metabolic syndrome were evaluated by multiple regression analysis, along with other traditional cardiovascular risk factors. Confirmatory factor analysis (CFA) was used to test the hypothesis that both the established components of metabolic syndrome and the novel variables identified by the regression analysis were associated with a single underlying factor. HOMA-IR, PAI-1 and HbA1c were the only biomarkers independently related to metabolic syndrome. CFA validated a one-factor model that included these variables. Moreover, the indices of goodness of fit were better for this expanded model than those obtained for a previously validated one-factor model that was restricted to the conventional elements of the syndrome. CONCLUSIONS: These findings show that PAI-1 and HbA1c are singularly linked to metabolic syndrome. Their elevation is presumably another manifestation of the same pathophysiological mechanism that underlies the recognized traits of the syndrome.  相似文献   
48.

Background  

The authors examined factors associated with nutritional resilience/vulnerability among preschoolers in the Gaza Strip in 2007, where political violence and deprivation are widespread.  相似文献   
49.

Background  

To determine physical and psychosocial well-being of adolescents with type 1 diabetes by self-report and parent report and to explore associations with glycemic control and other clinical and socio-demographic characteristics.  相似文献   
50.
The present study investigated similarities and reciprocal influences in emotional, external and restrained eating in adolescent siblings, and the moderating role of sex and quality of relationship. A total of 415 sibling pairs (aged 13-16 years) participated in this two-wave one-year longitudinal study. Analyses were conducted by means of Structural Equation Modeling. Cross-sectional findings demonstrated that siblings are moderately similar in their eating behavior. Longitudinal findings showed that the younger siblings exert a small influence on the emotional and external eating behavior of the older siblings. No support was found for the older siblings affecting the younger siblings in their eating behavior. Furthermore, no sex differences were found in the associations between sibling eating behaviors within and over time. However, we did find a moderating effect for the quality of the relationship concerning similarities in emotional eating. Future research focusing on various sociocultural influences on adolescents' eating behaviors should also include younger siblings.  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