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   22303篇
  免费   1779篇
  国内免费   32篇
耳鼻咽喉   173篇
儿科学   744篇
妇产科学   618篇
基础医学   2977篇
口腔科学   239篇
临床医学   2888篇
内科学   4095篇
皮肤病学   277篇
神经病学   2234篇
特种医学   436篇
外科学   2246篇
综合类   374篇
一般理论   81篇
预防医学   3319篇
眼科学   234篇
药学   1298篇
中国医学   17篇
肿瘤学   1864篇
  2023年   276篇
  2022年   171篇
  2021年   956篇
  2020年   606篇
  2019年   926篇
  2018年   931篇
  2017年   695篇
  2016年   743篇
  2015年   766篇
  2014年   994篇
  2013年   1360篇
  2012年   2085篇
  2011年   2010篇
  2010年   1056篇
  2009年   853篇
  2008年   1494篇
  2007年   1409篇
  2006年   1403篇
  2005年   1278篇
  2004年   1109篇
  2003年   910篇
  2002年   796篇
  2001年   111篇
  2000年   100篇
  1999年   123篇
  1998年   175篇
  1997年   101篇
  1996年   56篇
  1995年   61篇
  1994年   38篇
  1993年   49篇
  1992年   32篇
  1991年   27篇
  1990年   31篇
  1989年   24篇
  1988年   22篇
  1987年   18篇
  1986年   21篇
  1985年   37篇
  1984年   38篇
  1983年   23篇
  1982年   31篇
  1981年   38篇
  1980年   21篇
  1979年   12篇
  1978年   15篇
  1977年   10篇
  1975年   10篇
  1972年   5篇
  1928年   5篇
排序方式: 共有10000条查询结果,搜索用时 562 毫秒
1.
2.
The current study explored the influence of three methods of parental emotion discourse (structured story-telling, reminiscing, and picture book) and their relation to preschoolers’ emotion understanding. Thirty-seven families participated in the study. Analyses showed that the structured story-telling method produced more emotion words, was high in unique emotion words, and was high for both emotion labelling and explanations. All three methods showed some potential to predict preschooler’s emotion understanding. Structured story-telling was best at predicting role-taking, while reminiscing and the picture book both were better at predicting situation knowledge. Additional studies are needed to further explore the influence of different methods of assessing emotion discourse to enhance validity and reliability of research in this field.  相似文献   
3.
4.
Nidogen 1 (NID1) is a glycoprotein found in basement membranes involved in cross-linking collagen IV and laminin. The role of NID in breast cancer has only been evaluated in a small number of studies and the findings of these studies have been inconsistent. Our previous work revealed that highly tumorigenic murine mammary tumor cells express high levels of Nid1 while weakly tumorigenic mammary tumor cells express low levels of Nid1. To investigate Nid1, two stable knockdown lines were created, and Nid1 knockdown was confirmed at both the mRNA and protein level. Nid1 knockdown significantly reduced cell proliferation and migration/invasion and these reductions in proliferation and migration/invasion could be rescued by conditioned media containing NID1 protein. The reduced migration/invasion observed in the Nid1 knockdown cells was not associated with significant alterations in the epithelial gene Cdh1 or the mesenchymal genes Snai1, Snai2, Twist1, Twist2, Zeb1 and Zeb2. Therefore, suppression of Nid1 expression reduces proliferation and migration/invasion in claudin-low murine mammary tumor cells.  相似文献   
5.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
6.
7.
Reactive lymphoid infiltrates of the skin composed predominantly of gamma‐delta (γδ) T cells are not well described in the literature. Herein we report a case of an otherwise healthy 4‐year‐old male who presented with a waxing and waning papular rash characterized by small, discrete crusted papules spread across his trunk, face and extremities. Clinical evaluation revealed no evidence of systemic disease. Microscopic examination revealed a dermal, perivascular infiltrate of highly atypical lymphocytes with a γδ T cell phenotype, worrisome for primary cutaneous γδ T cell lymphoma. The clinical course, however, was that of a reactive condition and prompted consideration of a diagnosis of pityriasis lichenoides et varioliformis acuta (PLEVA) and lymphomatoid papulosis (LyP). In many ways, this case defies current classification schemes and seems to expand the spectrum of reactive γδ T cell infiltrates of the skin.  相似文献   
8.
9.
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates.  相似文献   
10.
Background: Patient feedback is increasingly important in clinical practice, and this should include children’s views. 28 children aged 8–10 years participating in a large-scale OSCE underwent cranial nerve examination by student candidates. They scored each out of 10 for the question: ‘If you had to see a doctor again, how happy would you be to see this one?’ An age-adapted qualitative focus group methodology was used to explore why they scored some students more highly than others.

Results: Children’s scores for the 256 medical students ranged from 2 to 10 (median 9; mean 8.46). 76% of scores were above 8. ‘Good' doctor attributes included: ‘friendly’, ‘funny’, ‘knowledgeable’, ‘confident’; ‘bad’ doctor attributes were: ‘making mistakes’, ‘not paying attention’, ‘forgot everything’, ‘serious’. Children’s reasons for specific scores are further explored.

Discussion and conclusion: Scores were positively skewed, in line with most patient/simulated patient feedback, and children discriminated between candidates. It should not be assumed that clinician examiners can accurately represent the views of child patients who may value different qualities in doctors. Children participating in our study had clear views of what they want from a doctor: a consultative approach with clear and kind explanation of the process of examination.  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