551 research outputs found

    The Study of Ultrastructure、ATP、Calcium and RNA-Seq in fertile and sterile anthers of Lycium Barbarum L.

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    高等植物的雄性不育是杂种优势利用的基础,避免了去雄的繁杂程序。植物雄性不育的种类很多,形成原因也很复杂,对雄性不育机理的探索一直是一个热门研究领域。枸杞雄性不育系是近年来新发现的一种不育类型,具有很大应用潜力,为了明确其雄性不育发生的机制并更好地开发利用这一宝贵种质资源,我们从结构、生理和分子生物学等几个方面展开了研究。 本研究以可育系宁杞1号和不育系宁杞5号为实验材料,用超微结构、ATPase和Ca2+的细胞化学定位,以及转录组和数字基因表达谱研究了枸杞花药发育的特征并比较了不育花药形态、结构和基因表达的差异。主要研究结果如下: (1)超微结构研究结果显示,不育花药最早出现的结构异常是在...The male sterility (MS) of higher plants is the basis for utilization of heterosis. However, there are many types of MS and the reasons caused to it are very complex. The mechanism of male sterility is still unclear, and the research of MS has been a hot research field for a long time. Ningqi 5 is a new type of MS found in Lycium Barbarum L. in 2005. In order to figure out the mechanism of MS a...学位:理学博士院系专业:生命科学学院_发育生物学学号:2162012015381

    Ethical Leadership and Whistleblowing Intentions:The Roles of Perceptions of Organizational Politics and Moral Courage

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    最近关于“假疫苗”的新闻广受热议,与之前的三聚氰胺、苏丹红等事件相似,涉案企业备受指责,但类似的事件仍层出不穷,这些都涉及到组织的伦理问题。随着组织所处环境日益多变,组织中的伦理问题也越来越复杂,越来越受到企业管理者和学者们的关注。但目前的研究视角围绕着如何促进组织中的伦理行为,很少有研究者从不伦理行为出发,从“病根”入手改善和引导组织中的不伦理行为。因此本文从员工揭发为中心,探索组织中员工揭发意向的形成机制,为领导者管理员工揭发提供有效指导,为组织激励员工揭发提供新的方向。 本文基于社会学习理论,围绕着员工揭发意向,探索伦理型领导、员工揭发意向、组织政治感知、道德勇气之间的关系。通过对重庆...The news of Fake Vaccine Event is widely talked about recently and the companies involved have been blamed similar to previous events of Melamine and Sudan Red. However, such events are emerging in endlessly concerning the ethical issue of the organization. The ethical issue of the organization is more and more complicated and being concerned by the business managers and scholars with the changing...学位:管理学硕士院系专业:管理学院_企业管理学号:1762013115130

    Word-formation of “Heart” And Teaching Chinese As A Foreign Language

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    随着对外汉语的逐渐升温和在世界范围内的迅猛发展,对外汉语的研究视角也随之细化和深化。词汇作为对外汉语中的重要组成部分,既是学生进行语言学习和跨文化交际的要求,也是教师语言要素教学的主体。词汇中,单音节语素在古汉语时期多单独成词使用,随着汉语双音化的发展趋势和语言的经济性原则,这些单音节词逐渐作为重要的成分参与构词,构成的合成词词义也呈现出多样化的态势。从当前的研究来看,对语素义和词义的探索多为列举和表面分析,对义项的内部联系也多通过隐喻、转喻等引申手段加以说明,将之与文化相关联的研究也在逐步展开,但研究力度和深度有待加强。本文将“心”的研究置于文化视角下,分以下四大部分进行论述: 第一部分,...With the rise and rapid development of Chinese on a global scale, the research perspective of teaching Chinese as a second language is refining and deepening. As an important part of Chinese learning, vocabulary is not only the requirement of language learning and cross-cultural communication, but also the major part of teaching listening, speaking, reading and writing for the teachers. Mono polys...学位:文学硕士院系专业:海外教育学院_语言学及应用语言学学号:2652012115127

    Complete androgen insensitivity syndrome, a pedigree gene mutation analysis

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    研究背景 雄激素不敏感综合征(AndrogenInsensitivitySyndrome,AIS),是一种常见的男性假两性畸形。是伴X连锁隐性遗传病。患者染色体核型为46,XY,但其X染色体上的雄激素受体(Androgenreceptor,AR)基因存在缺陷,可致雄激素靶器官上的AR出现缺陷,体内的雄激素不能发挥相应的作用而出现相应的临床症状。此疾病可对患者的生殖能力造成不同程度的影响,还可能引发与性发育异常相关的性心理、性行为的异常,并可能给社会和患者家庭造成难以挽回的损失。目前基因诊断是AIS诊断的金标准,其致病基因一直在不断的被发现,目前有研究表明此综合征的遗传背景较为复杂多样,故继续...Background Androgen insensitivity syndrome (AIS), is a common male pseudohermaphroditism. An X-linked recessive genetic disorder.The patients karyotype is 46, XY, but its androgen receptor geneon the X chromosome defects,which can cause the AR dysfunction on the androgen target organs.The androgens does not work correctly can cause relevant clinical symptoms. This disease can has different effect...学位:医学硕士院系专业:医学院_妇产科学学号:2452013115352

    Molecular mechanisim and structural studies of ribosomal protein S1

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    结核分枝杆菌感染引起的结核病(tuberculosis)仍然是全球致死率最高的传染 性疾病之一。随着全球耐多药结核菌株的出现和蔓延,迫切需要寻找新药靶和研 发新药。抗结核病一线药物吡嗪酰胺(pyrazinamide,PZA)是联合用药中不可缺少 的一个组分,可以杀死潜伏期或缓慢复制期的结核分枝杆菌,把治疗周期由9-12 月缩短为6个月。PZA的活性形式吡嗪酸(pyrazinoicacid,POA)能够抑制结核分 枝杆菌核糖体蛋白RpsA(MtRpsA)与tmRNA的相互作用,导致反式翻译过程 (trans-translation)的终止。由于哺乳细胞中不存在tmRNA,因此反式翻译...Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), remains one of the leading causes of death worldwide. The emergence of multi-drug-resistant strains of M. tuberculosis makes the discovery of new drug target and molecular scaffolds a priority. PZA in the regimen is pivotal in shortening the duration of TB therapy from 9-12 months to 6 months, which can kill non- or slowly-replicat...学位:理学博士院系专业:化学化工学院_化学生物学学号:2052011015372

    Textual Research on the struggle for power among parties in the Dynasty of South Tang and The mentality of scholars

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    南唐只存在三十九年,但党争却持续了十余年。当时稍有声望的文臣几乎都被涉及,历经了宦海的沉浮。南唐也因朋党之争而由强变衰,到后主李煜之时,只能靠纳贡称臣勉强维持生计。因此南唐党争就成为后代学者研究南唐史,探讨当时文人生活不可避免的课题。关于南唐党争产生的原因,前人普遍认为南北士人的文化矛盾是南唐党争的主要原因。笔者认为,除此以外,南唐文人较为优越的社会地位以及由此所产生的人格心态的变化也是南唐党争产生的重要原因。本文第一章对南唐党争的始末进行较为全面的梳理;第二章论述南唐党争与南唐文人优越的社会地位和由此所产生的人格心态的变化的相互关系。由于南唐文人在生活上养尊处优,在政治、军事与外交上被赋予了...Although the Dynasty of South Tang lasted only for about 40 years, the struggle for power among parties in the ruling class persisted for more than 10 years during this period. Most of the scholars worked for the government got involved in the struggle and experienced ups and downs. During the ruling period of Emperor Li Yu, the empire became so weak as a result of such struggle that it could only...学位:文学硕士院系专业:人文学院中文系_中国古代文学学号:20020103

    统合儒释:王审知治闽方略探析

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    王审知治闽期间,从闽人奉佛的实际出发,大力扶持佛教,推行统合儒释之治闽方略,以儒家为主,以佛教为辅,利用儒家与佛教思想的相通性以巩固统治。黄滔是其最重要的谋臣,其文章充分展现了王审知这一治闽方略。漳州师范学院科研资助项目(项目编号:SS07004

    晚清英美地质学教科书的引进——以商务印书馆《最新中学教科书·地质学》为例

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    鸦片战争后,地质学这门19世纪新兴的科学通过多种途径传入中国。甲午战争后,近代地质学教科书成为地质学知识传播的主要载体。本文以商务印书馆《最新中学教科书·地质学》(1905年)为例,考察晚清英美地质学教科书的引进情况。通过与赖康忒(Joseph Le Conte,1823~1901年)原著《地质学概要》(A Compend of Geology)初版、修订版的对比研究,指出中文本翻译底本为1898年修订版。分析中文本对原著的增删,探讨其语言特点与译者对术语的处理方式。在分析该书以及同时代其他教科书的同时,尝试梳理地质学在晚清传播的过程,进而探讨地质学传入与晚清时代背景之关系

    Rational Analysis on Internal Audit Outsourcing

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    20世纪80年代末,企业开始将内部审计职能部分或全部通过契约委托给会计师事务所或其他专业人士执行,这种内部审计外部化的现象在90年代逐步发展至高潮阶段,并引起了学术界和实务界的普遍关注。但是至本世纪初,该现象又发生了新的变化,许多企业纷纷将外包的部分内部审计业务收回,放弃先前“全外包”措施,更多的采用“合包”的内部审计形式,实务界出现了内部审计外部化的回归浪潮。 本文从内部审计外部化相关概念的辨析入手,分析内部审计外部化的理论基础、总结学术界对内部审计外部化问题的相关争论,并对内部审计外部化的回归现象作深入探讨,最后就我国的内部审计外部化问题作出展望。 本文在获取大量文献资料,认真学习前人...At the end of the eighties of the 20th century, some international enterprises started to contract their internal auditing services. The phenomenon of internal audit outsourcing has become extremely popular in 1990’s, and has also caused the concern of the academic and the practice. However, at the beginning of this century, there is a new change of this phenomenon. More and more enterprises provi...学位:管理学硕士院系专业:管理学院会计系_会计学学号:1752007115111

    Design and Verification of the USB2.0 Device Controller integrated in PowerPC Architecture

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    随着USB技术的广泛应用,市场对兼容USB协议的设备控制器芯片的需求大量增加。由于电子系统设备接口的数据传输速度不断提升,原有的USB1.1协议(12Mb/s)已经逐渐被高速的USB2.0传输协议所替代,接口数据传输速度可提高到480Mb/s,因此,USB2.0成为了目前电子系统设备接口的标准配置之一。本论文工作旨在设计一种基于FPGA内部PowerPC架构的USB设备控制器,即设计实现了将处理器、USB设备接口IP核和其他外围模块等集成在一个SoC(片上系统)芯片内。本文首先介绍了USB2.0设备控制器开发的相关知识和FPGA平台的构建;然后设计和验证了USB2.0设备控制器;最后将USB2...With the extensive application of USB technology, there is a significant increase in demand for the device controller chip which is compatible with USB protocol.As the upgrade of data transmission speed of electronic system device interface, the original USB1.1 protocol (12Mb/s) has gradually been replaced by high-speed USB2.0 transfer protocol, and the interface data transfer is speeded up to 480...学位:理学硕士院系专业:物理与机电工程学院物理学系_凝聚态物理学号:1982006115179
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