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   11550篇
  免费   1145篇
  国内免费   291篇
耳鼻咽喉   24篇
儿科学   176篇
妇产科学   132篇
基础医学   3077篇
口腔科学   143篇
临床医学   675篇
内科学   1846篇
皮肤病学   89篇
神经病学   1420篇
特种医学   160篇
外国民族医学   1篇
外科学   667篇
综合类   1111篇
一般理论   1篇
预防医学   892篇
眼科学   107篇
药学   1178篇
  2篇
中国医学   534篇
肿瘤学   751篇
  2023年   205篇
  2022年   173篇
  2021年   427篇
  2020年   415篇
  2019年   410篇
  2018年   384篇
  2017年   438篇
  2016年   458篇
  2015年   541篇
  2014年   682篇
  2013年   867篇
  2012年   665篇
  2011年   688篇
  2010年   619篇
  2009年   632篇
  2008年   615篇
  2007年   530篇
  2006年   482篇
  2005年   412篇
  2004年   385篇
  2003年   285篇
  2002年   247篇
  2001年   230篇
  2000年   204篇
  1999年   148篇
  1998年   137篇
  1997年   109篇
  1996年   121篇
  1995年   134篇
  1994年   97篇
  1993年   109篇
  1992年   97篇
  1991年   78篇
  1990年   71篇
  1989年   83篇
  1988年   88篇
  1987年   46篇
  1986年   63篇
  1985年   72篇
  1984年   92篇
  1983年   47篇
  1982年   77篇
  1981年   58篇
  1980年   57篇
  1979年   50篇
  1978年   34篇
  1977年   29篇
  1976年   40篇
  1975年   13篇
  1973年   15篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
《Molecular therapy》2022,30(8):2856-2867
  1. Download : Download high-res image (173KB)
  2. Download : Download full-size image
  相似文献   
2.
3.
4.
High Temperamental Negative Affectivity in early childhood has been found to predict later emotion dysregulation. While much work has been conducted to separately probe bio-behavioral systems associated with Negative Affectivity, very little work has examined the relations among multiple systems across age. In this study, we use multi-modal methods to index neurobiological systems associated with Negative Affectivity in 53 4-7-year-old children. Prefrontal activation during emotion regulation was measured using functional near-infrared spectroscopy over the lateral prefrontal cortex (PFC) while children played a game designed to elicit frustration in Social (Happy and Angry faces) and Nonsocial contexts. Gaze behaviors while free-viewing Happy and Angry faces were also measured. Finally, Negative Affectivity was indexed using a score composite based on factor analysis of parent-reported temperament. Using mixed-effects linear models, we found an age-dependent association between Negative Affectivity and both PFC activation during frustration and fixation duration on the mouth area of Happy faces, such that older children high in Negative Affectivity spent less time looking at the mouths of Happy faces and had lower PFC activation in response to frustration (ps<0.034). These results provide further insight to how Negative Affectivity may be associated with changes in affective neurobiological systems across early childhood.  相似文献   
5.
BackgroundInsomnia is prevalent among children and adolescents and is associated with a wide range of negative outcomes. Knowledge about its determinants is therefore important, but due to the lack of longitudinal studies, such knowledge is limited. The aim of the present inquiry is to identify child and family predictors of future pediatric insomnia within a psycho-bio-behavioral framework.MethodsA representative community sample (n = 1,037) was followed biennially from 4 to 14 years of age (2007–2017). Insomnia was defined based on the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria and was diagnosed by a semistructured clinical interview of children (from age eight years of age) and parents (all ages). Predictors included parent ratings of child emotional reactivity, family functioning, and marital conflict; self-reports of personality; and teacher-rated emotion regulation skills.ResultsRandom intercept cross-lagged analyses revealed that within-person increases (ie, relative to the child's typical levels across childhood) in emotional reactivity and decreases in emotion regulation skills predicted insomnia diagnosis two years later from ages 4 to 14 after adjusting for previous insomnia and all unmeasured time-invariant factors. Previous insomnia was the strongest predictor of later insomnia, whereas family functioning and marital conflict did not predict insomnia.ConclusionsIncreases in emotional reactivity and decreases in emotion regulation skills predicted insomnia above and beyond all unmeasured time-invariant factors and could be targets for interventions. Previous insomnia predicted later insomnia, thereby underscoring the importance of detecting, preventing, and treating insomnia at an early age.  相似文献   
6.
《Human brain mapping》2021,42(7):1945
Having the means to share research data openly is essential to modern science. For human research, a key aspect in this endeavor is obtaining consent from participants, not just to take part in a study, which is a basic ethical principle, but also to share their data with the scientific community. To ensure that the participants'' privacy is respected, national and/or supranational regulations and laws are in place. It is, however, not always clear to researchers what the implications of those are, nor how to comply with them. The Open Brain Consent (https://open-brain-consent.readthedocs.io) is an international initiative that aims to provide researchers in the brain imaging community with information about data sharing options and tools. We present here a short history of this project and its latest developments, and share pointers to consent forms, including a template consent form that is compliant with the EU general data protection regulation. We also share pointers to an associated data user agreement that is not only useful in the EU context, but also for any researchers dealing with personal (clinical) data elsewhere.  相似文献   
7.
Due to the COVID-19 pandemic's consequences and the state of alarm, literature has shown that people worldwide have experienced severe stressors that have been associated with increased prevalence of emotional distress. In this study, we explored psychological distress (depression, anxiety, and somatization symptoms) using an online survey platform in a sample of 1,781 Spanish adults during the confinement due to COVID-19, relationships between distress and sleep problems, affect, pain, sleep, emotional regulation, gender, type of housing, history of psychopathology, and living alone during the confinement, and differences depending on demographic and psychological variables. Results showed that between 25% and 39% of the sample referred to clinically significant levels of distress. In addition, women showed higher levels of distress, negative affect, perception of pain, and cognitive reappraisal and lower levels of emotional suppression and sleep quality than men. A history of psychopathology, being younger, living alone or in a flat was associated with higher distress. Finally, the variables most strongly related to distress were negative and positive affect, levels of pain, sleep quality, and emotional suppression. Our results highlight the important role of emotional suppression, cognitive reappraisal, and loneliness and the impact of being a woman and younger in Spain during the COVID-19 pandemic. Therefore, it would be necessary to provide assessments of distress levels in these population groups and focus psychological preventive and therapeutic online interventions on expressing emotions and preventing loneliness.  相似文献   
8.
A growing body of evidence has suggested that the imbalance of epigenetic markers and oxidative stress appears to be involved in the pathophysiology and progression of stroke. Thus, strategies that modulate these biomarkers might be considered targets for neuroprotection and novel therapeutic opportunities for these patients. Physical exercise has been reported to induce changes in these epigenetic markers and improve clinical outcomes in different populations. However, little is reported on this in post-stroke patients. The purpose of this study was to investigate the effect of a single exercise session with Walk Aide functional electrical stimulation(FES) on cognitive performance, clinical functional parameters, oxidative stress and epigenetic modulation in post-stroke individuals. In this crossover design study, 12 post-stroke individuals aged 54–72 years of either sexes were included and subjected to a single session of exercise(45 minutes) without Walk Aide functional electrical stimulation(EXE alone group), followed by another single session of exercise(45 minutes) with Walk Aide functional electrical stimulation(EXE + FES group). The clinical functional outcome measures, cognitive performance and blood collections for biomarker measurements were assessed pre-and post-intervention. After intervention, higher Berg Balance Scale scores were obtained in the EXE + FES group than in the EXE alone group. There was no significant difference in the Timed Up and Go test results post-intervention between EXE alone and EXE + FES groups. After intervention, a better cognitive performance was found in both groups compared with before the intervention. After intervention, the Timed Up and Go test scores were higher in the EXE + FES group than in the EXE alone group. In addition, the intervention induced lower levels of lipid peroxidation. After intervention, carbonyl level was lower, superoxide dismutase activity and superoxide dismutase/catalase activity ratio were higher in the EXE + FES group, compared with the EXE group alone. In each group, both histone deacetylase(HDAC2) and histone acetyltransferase activities were increased after intervention compared with before the intervention. These findings suggest that a single exercise session with Walk Aide FES is more effective on balance ability and cognitive performance compared with conventional exercise alone in post-stroke patients. This is likely to be related to the regulation of oxidative stress markers. The present study was approved by the Research Ethics Committee of the Methodist University Center-IPA(approval No. 2.423.376) on December 7, 2017 and registered in the Brazilian Registry of Clinical Trials—Re BEC(RBR-9 phj2 q) on February 11, 2019.  相似文献   
9.
Applications of biomedical R&D currently imply substantial societal concerns. This paper explores, based on semi‐structured interviews with scientists in Norway, how biomedical researchers experience and tackle such concerns in their daily work. It shows how ritualised routine responses to dislocatory moments help maintain order in the daily work of the interviewed scientists; they do not address directly but instead smooth over concerns by a ritualised way of using ethics. This may foreclose substantive reflection and function as a stabiliser for ‘business as usual’. Overall, the current way of responding to concerns as described by the interviewees may contribute to a depoliticisation of important issues. The paper contributes to sociological work on ethics by linking it to recent discussions on Responsible Research and Innovation (RRI) and by the empirical research presented. The insights can also help improve science policies such as RRI.  相似文献   
10.
ObjectivesThis research aims to compare coping strategies (strategies developed to cope with stress) and temperamental dimensions used by children and adolescents have not been maltreated and those who have been. The aim of these analyzes is to identify the effects of age as well as vulnerabilities and resources for children and adolescents who have been maltreated.Materials and methodsA total of 232 children and adolescents aged 7 to 16 years participated in this study including 115 who have never been maltreated (control group) and 117 have been maltreated and are living in foster care (placed group). Each young people responded to a scale measuring the frequency of coping strategies (Kidcope) as well as a questionnaire of temperament (questionnaire d’auto- et d’hétéro-évaluation du tempérament en sept facteurs pour l’enfant d’âge scolaire et l’adolescent).ResultsAn analysis of variance (ANOVA) was performed for each coping strategy and temperamental dimension to evaluate the consequence of maltreatment on the emotional regulation, according to the slice of age. The age-based comparison of control and placed groups reveals major differences in the use of certain coping strategies as well as in the temperamental dimensions of maltreated children and adolescents. This confirms that the child's life experience influences his way of understanding his environment and affects his individual resources.ConclusionsThe results show vulnerabilities of emotional regulation for children and adolescents who have been maltreated. These aspects underline the importance to think about supports in order to promote the development of some coping strategies and to reduce the stressors. These points will be discussed with preventive and therapeutic used to improve coping skills and emotional regulation.  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