共查询到19条相似文献，搜索用时 156 毫秒
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植物多倍体的形成及应用研究综述 总被引：1，自引：0，他引：1
介绍了植物多倍体的含义及其在高等植物中的分布,综述了植物多倍体的类型、形成途径、诱导方法及其应用等方面的研究进展,展望了植物多倍体今后研究的发展趋势。 相似文献
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植物诱导抗病性机制的研究进展 总被引：3，自引：0，他引：3
目的 研究植物诱导抗病性机制的进展.方法 参阅大量文献资料进行分析论证.结果 从组织病理学、生理生化乃至分子结构与功能的一系列变化阐述植物诱导产生抗病性的机制.同时指出植物抗病性在农林业生产中的存在的问题和发展前景.结论 虽然植物诱导抗病性是植物保护的新途径和新技术,但植物诱导产生抗病性的机制是复杂的、多层次的,仍需要进一步的探讨. 相似文献
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1 教材分析
“染色体变异”是人教版高中生物学教材《必修2·遗传与进化》第五章第二节的内容,是在学生学习基因突变和基因重组的内容之后,继续对可遗传变异类型的学习.本节教材包括2个课时的内容,课标中的具体内容主要涉及染色体结构变异、染色体组、二倍体、多倍体、单倍体等概念及其应用,以及低温诱导植物染色体数目变化的实验.第一课时主要完成染色体结构变异、染色体组和二倍体及多倍体等概念及其应用的教学;第二课时为低温诱导植物染色体数目变化的实验. 相似文献
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本综述了鱼类多倍体形成的机制、多倍体的诱导方法，并重点介绍了染色体制片多倍体倍性鉴别方法。同时对鱼类多倍体育种的应用前景进行了描述。 相似文献
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秋水仙碱诱导菘蓝多倍体的研究 总被引：7，自引：0，他引：7
采用直接浸渍和加入培养基法对菘蓝种子进行诱导,探讨秋水仙碱诱导菘蓝多倍体的方法。结果表明:用秋水仙碱诱导菘蓝多倍体植株是有效的,已有部分植株已加倍成为同源多倍体。 相似文献
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问:时常听到有各种各样植物的多倍体,而不常听到动物多倍体,是否在自然界中,多倍体主要发生在植物界,而动物界不常发生,若是这样,又是什么原因呢? 答:这是一个非常有趣的问题。自然界中确实有许许多多的植物多倍体,例如小麦、烟草、蔷薇、无籽西瓜等等。有人作过统计,双 相似文献
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王延伟 《佳木斯教育学院学报》2011,(6):91-91,93
本文分析了经典遗传学定律验证及人类性状的遗传平衡分析中卡方测验的应用及多倍体诱导条件优化中试验设计的选取,并就目前遗传学实验教学中相关统计学的应用提出个人的看法。 相似文献
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This paper focus on defining a research question while conducting action research among third-year students attending a course on Research Literacy at a teacher education college. This paper discusses the process of preparing for and conducting action research among third-year students attending a course on Research Literacy at a teacher education college. The students were asked to conduct an action research on their classroom activities. The aim of this article is to present the process and pinpointing the discomfort of the students in formulating a research question suited to action research thanks to two prerequisite conditions: the ‘safe space’ and the ‘tender spot’. The research findings illustrate that the students had difficulty defining their ‘tender spot’. It was necessary to create a ‘safe space’. Furthermore, the findings show that the ‘tender spot’ issues were associated with disciplinary content far more than with generic lesson management or classroom management issues. The approach discussed here is leading to positive change and it may be that this professional development tool can facilitate the induction of novice teachers everywhere. 相似文献
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金仁义 《河南师范大学学报(哲学社会科学版)》2012,39(3):150-154
张须的《通鉴学》是一部颇具学术影响的史学专著.张须在《通鉴学》中运用了“考镜源流”、考证、比较与归纳等治史方法,使其立论严谨、翔实、平允.史学方法的得当运用,使《通鉴学》得以成功构建《通鉴》研究的完整体系,获得很高的学术价值.《通鉴学》的史学方法,应当得到充分认识和高度评价. 相似文献
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自我意识情绪是指人们根据一定的价值标准评价自我或被他人评价时产生的情绪,主要有自豪、傲慢、内疚、羞耻、尴尬等形式。而自我意识情绪理解是指个体对自我意识情绪的认知。该文对自我意识情绪理解的相关理论和研究方法进行了回顾,从不同的研究角度对儿童自我意识情绪的研究现状进行了阐述,并对自我意识情绪理解与情绪调节的相互关系进行了探讨,且对未来自我意识情绪理解研究的开展进行了展望。 相似文献
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Gary Motteram 《Distance Education》2005,26(3):281-298
This paper reports the findings of a qualitative study that investigated the experiences of distance learners beginning online Master of Education programmes. The research explored students’ induction (referred to as “orientation” in some contexts) to the programmes, and three key areas are given consideration in this paper. First, the opportunities and constraints provided by the technology in terms of introducing students to their online studies and the online environment are discussed. Second, some human elements are examined; namely, students’ needs, students’ relationships with fellow students, and the role of tutors. Third, there is a discussion on the development of online learning communities; their role and importance, and how students might be effectively integrated into them. Some implications for online teaching and learning are outlined and recommendations for online induction are provided. The paper concludes that a fundamental understanding of both students’ needs and their initial encounters with online distance education are important to ensure effective support is provided when students commence their studies. 相似文献
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A number of methods have been recorded in the literature with regard to assessing intercultural competence, but extant reviews tend to focus on self-report instruments in which students' responses can be easily quantified. To address the gap, this paper provides an overview of qualitative methods used to assess students' intercultural competence in higher education research. Based on 34 studies, 25 qualitative assessment methods have been identified and captured in a newly-developed typology. Results show that (1) the majority of qualitative methods to assess intercultural competence were writing-based and ‘expressive’ in nature; (2) the assessment results were mainly analysed in a ‘thematic’ or ‘scalar’ manner; and (3) very little assessment took place among STEM majors. These results are further discussed and problematized to provide implications for developing and assessing intercultural competence in higher education research and curriculum. 相似文献
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Håvard Åsvoll 《International journal of qualitative studies in education》2013,26(3):289-307
Within the area of interpretative case studies, there appears to be a vast amount of literature about theoretical interpretations as the main analytical strategy. In light of this theoretically based strategy in case studies, this article presents an extended perspective based on Charles Sanders Peirce’s concepts of abduction, deduction and induction. I intend to show some of the integral relationships between these concepts which can be relevant for interpretative case studies exemplified by classroom research. The connections between these concepts and interpretative field research result in two interpretative strategies, illuminated by syllogisms, and named abduction–deduction–induction (A–D–I) and deduction–induction–abduction (D–I–A). These strategies will be discussed. 相似文献
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环境因子可以诱导化感物质丁布的合成与释放,这是其在进化过程中产生的一种对环境的适应性机制。从丁布的微生物诱导、害虫诱导、植物诱导等生物诱导因子和物理诱导、化学诱导等非生物诱导因子以及诱导机理等方面进行了概述,并对今后丁布的研究和利用进行了展望。 相似文献