植物转基因沉默     

谷维娜  王建辉 《保定师专学报》2002,15(4):20-23

转基因沉默分为两种水平:第一种是转录水平上的基因沉默,发生原因主要是位置效应、异染色质化以及甲基化;第二种是转录后水平上的基因沉默,发生原因是通过对靶标RNA进行特异性降解而使基因失活,并就此研究提出RNA阈值模型、异常RAN模型、分子间(内)配对模型与RNA干涉模型来解释这种现象产生的机制。  相似文献   

告别言语行为分析   总被引：7，自引：0，他引：7  

李丽娜 《安徽教育学院学报》2003,21(4):79-81,97

告别言语行为在日常生活中非常普遍．其表现形式多样，策略类型丰富。认识和掌握告别的技巧，对提高语言质量．增强交际能力．巩固交谈双方的社会关系．具有重要的现实意义。  相似文献   

陶行知平民教育思想与当今乡镇社区教育     

宋丽娜 《大连教育学院学报》2002,18(4):26-27

陶行知的平民教育思想在中国 2 0世纪上半叶影响广泛 ,他的“社会即学校”、教育与生活实际相结合、利用的社区一切可利用的资源为教育服务、“乡村学校应当做改造乡村生活的中心”的思想对当今开展乡镇社区教育仍具有参考价值  相似文献   

Editorial H-score as a metric of inner authenticity for national scientific journals—Pilot study for the field of pedagogy     

Petr Novotný  Karolína Kotvaltová Sezemská  Romana Schubertová  Vanda Janštová 《Learned Publishing》2023,36(2):194-204

There is evidence that national scientific journals are important for local communities despite their limited audience due to national languages and topics, like in pedagogy. However, it is not easy to assess the level of scientific rigour of local journals, as most do not have available scientometric data and are often published in minority languages. We hypothesize that a possible manifestation of a latent trait of inner authenticity of the scientific journal (meaning the journal is accepted by a community interested in developing the field which conducts internationally accepted research) could be H-index of the editorial board members. To test this approach, we evaluated H-index and gender of editorial board members (n = 490) from 17 Czech and Slovak national science-oriented scientific pedagogical journals which were not indexed or indexed in Erih+ or Scopus, and compared this with the five lowest-rated journals from the same field indexed in the Web of Science (WoS) database. The H-index of editorial board members was somewhat higher in indexed journals with those from WoS showing higher scores, and the number of board members with no discernable H-index was far greater in non-indexed journals. Editorial boards of journals indexed in WoS were mostly male, compared to a dominance of women on boards of non-indexed journals. Acknowledging the limited sample, it appears that the H-index of editorial board members may be a way to value national scientific journals.  相似文献   

The influence of live- vs. video-model presentation on the early acquisition of a new complex coordination     

Léna Lhuisset  Eric Margnes 《Physical Education & Sport Pedagogy》2015,20(5):490-502

Background: Demonstration is a widely used method in sports teaching and coaching, based on the assumption that it is more beneficial than verbal instructions or trial-and-error methods for skill acquisition. Although in teaching/coaching situations, the demonstration is usually carried out in front of the learners, in a research context, it is most often presented via a video. However, a direct comparison between these two types of model has rarely been undertaken in a motor context.

Purpose: In this study, we aimed to compare the effectiveness of the observation of a live and a videomodel for the early acquisition of a complex judo movement.

Research Design: Participants observed either a live or a videomodel executing the task. After observation, they practised for three minutes taking five trials and then performed it for analysis. This procedure was repeated three times. The form and technique of each participant's execution were evaluated using a technical score.

Main results: The results indicated a significant improvement in the task execution by the end of the practice session. However, this improvement occurred only for the video-model group between the second and third blocks of practice.

Conclusions: The video demonstration seems more effective than the live one for the early acquisition of a completely new complex coordination. This may be due to the simplification of the visual information in the former condition because of its two-dimensionality. This simplification may allow the observer to identify the more key elements that would guide him/her for the subsequent performance of the task.  相似文献   

    

Héléna Siwek 《Educational Studies in Mathematics》1973,5(1):23-37

Sans résumé  相似文献   

高校学生体育、健康意识与行为的调查研究   总被引：17，自引：0，他引：17  

林少娜 《武汉体育学院学报》2002,36(2):113-114

对大学生体育健康与卫生意识进行调查，结果表明，大学生具有较好的健康和卫生意识，97％的学生对体育有良好的认知态度，大学生的健康意识与在校所学专业存在着明显的相关性，大学生的健康愿望与实际生活相差较大，对健康问题的关注和投入与他们对健康的良好认知不相符合。  相似文献   

Intrafamilial conflict and emotional well-being: a population based study among Icelandic adolescents     

Gunnlaugsson G  Kristjánsson AL  Einarsdóttir J  Sigfúsdóttir ID 《Child abuse & neglect》2011,35(5):372-381

Objectives

During intrafamilial conflicts children are often innocent bystanders, caught in the crossfire. In such situations, they are at increased risk to become directly involved in abusive verbal behavior of the perpetrator, and exposed to being shouted or yelled at, threatened, rejected and even physically abused. The present study has two main objectives: (1) ascertain a national base rate of intrafamilial conflicts and physical violence at home among Icelandic adolescents; and (2) to investigate the association of witnessing and/or having been a part of intrafamilial conflict or physical violence at home with variables that relate to mental health and well-being.

Methods

The participants were 3,515 students, 14- and 15-year-old, in the national compulsory school system in Iceland. As a part of the 2003 ESPAD survey, each pupil was asked about experiences of severe verbal arguments and physical violence at home as well as their background, behaviors, and mental health assessed with the use of tested measurement scales such as the Symptom Distress Checklist 90 (SCL-90) and the Rosenberg Self-Esteem Scale.

Results

About 22% of the participants stated that they had witnessed a severe verbal argument between parents and 34% stated that they had been involved in a severe verbal argument with parents. This rate was slightly higher for girls compared to boys. All together 7% of adolescents had witnessed physical violence at home where an adult was involved and 6% of the participants stated that they had experiences of being involved in physical violence at home where an adult was involved. Witnessing or being involved in severe verbal arguments at home and/or witnessing or being involved in physical violence with an adult was significantly associated with greater levels of depression, anger, and anxiety, and negatively related with self-esteem (p < 0.01).

Conclusions

Many adolescents in Iceland witness severe parental verbal arguments or physical violence between adults in their homes and some are directly involved in such acts. It affects their long-term emotional and behavioral development and well-being.

Practice implications

Preventive measures have to be implemented at an early age and should include, but not be limited to, information on disciplining and upbringing of children and the negative impact of intrafamilial conflicts on the long-term health of their children. Due attention should be given to the health and well-being of children where such violence is known to occur.  相似文献   

The effects of adult literacy on earnings and employment     

Maúna Soares de Baldini Rocha Vladimir Ponczek 《Economics of Education Review》2011,30(4):755-764

This paper provides evidence of the effects of adult literacy on individuals’ income and employability in Brazil based on information obtained from the monthly employment survey (PME). The OLS results indicate that after controlling for observable characteristics, there is a 21.25% increase in wages for individuals who become literate; however, there is no significant impact on employability. Moreover, the findings show an 8.1% increase in the probability of being employed in the formal sector. We also explore the longitudinal structure of the dataset to control for unobservable fixed characteristics of individuals. The fixed-effects estimators show smaller effects compared to the OLS estimators. We find that literacy has a 4.4% effect on wages and a 4.3% impact on the probability of being formally employed. The effects are significantly different from zero.  相似文献   

芝罘区旅游业发展现状与对策研究     

邹丽娜 《商丘职业技术学院学报》2014,(1):48-49,79

随着社会经济的发展,旅游业在拉动内需、扩大消费、促进发展等方面发挥着巨大的作用。芝罘区作为烟台的中心区,旅游资源极具挖掘潜力。本文将通过分析烟台芝罘区旅游业的发展现状和存在的问题,提出烟台芝罘区旅游业进一步发展的对策和建议。  相似文献