283 research outputs found

    Studies of the regulatory mechanism on myocardial related genes of Rbm24

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    实验目的 研究在心肌细胞分化和发育过程中,Rbm24蛋白发挥功能和产生的影响。寻找Rbm24结合的相关基因的不同水平的RNA,以及结合目的RNA后所发挥的功能,为降低Rbm24的表达导致扩张性心肌病等一系列心肌受损和功能紊乱相关疾病探究原因,寻找相关的信号通路,提供一定的实验及理论依据,为成功解决心脏疾病难题寻找重要的攻克点。 方法 通过Westernblot免疫印迹检测Rbm24和其他心肌相关蛋白在C2C12细胞分化中蛋白的表达情况,并用westernblot免疫印迹法来观察各种心肌细胞系中Rbm24的蛋白水平表达情况,通过在心肌细胞中用siRNA干扰技术在在心肌细胞中敲低Rbm24,...Purpose The goal of this project is to investigate the function of Rbm24 in cardac myocytes and the influences on cardiac differentiation.We search the target RNA of Rbm24 to investigate the function of them. Then we reveal the related signaling pathways in Rbm24 knockdown model that result cardiomyopathy,provide theory basis and an important approach to the treatment of cardiomyopathy. Method...学位:理学硕士院系专业:医学院_生理学学号:2452012115315

    The Cultural Ecology and Non-material Cultural Heritage Protection:Taking Mu Dong Folk Songs as an Example

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    口头与非物质文化不可再生,一旦走向消亡,就永远无法恢复。随着经济全球化与现代生活方式的转变,口头与非物质文化遗产日渐式微,受到全社会的广泛关注,但是,在国家政策保护下的口头与非物质文化遗产亦因文化生态环境的改变而发生变形、退化与萎缩。基于此,本文指出,对非物质文化遗产保护的最根本问题是从文化生态的角度保护其原生态性的文化生态环境。 文化生态是借用生态科学的概念、理论、观点和方法研究文化现象的理论,主要研究人类文化与其所处环境之间的密切关系,这里所说的环境不仅指自然环境,同时也包括文化环境。文化生态是一个内部因素相互作用的整体,是具体文化事项生存的根基与土壤,一旦整体文化生态发生改变,各种具体...Oral and non-material culture is a kind of non-renewable cultural resources,and it will never be able to restore or regenerate after dying. Because of the economic globalization and the change of modern life,the folk intangible culture is endangered under the change of their survival environments.The whole society has paid attention to the oral and non-material cultural heritages,But these heritag...学位:法学硕士院系专业:人文学院_民族学学号:1062013115235

    Design and Implementation of Jinkai Hotel Management System

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    酒店住宿业是为游客提供食宿、娱乐、休闲的场所,对于整个酒店行业的经营状况起到决定性的作用,因而在酒店管理上有效地提高酒店的运营状况至关重要。本文探讨如何实现一个酒店管理系统,对酒店的经营状况及服务进行有效的管理。以此提高酒店管理与酒店服务效率,对酒店工作人员、顾客、服务业务之间实现实时工作对接,完成酒店业务管理的有效性,高效性。 本课题采用软件工程的理论与方法,从实际应用需要出发,深入研究了系统开发的关键技术及设计方法,设计了一个基于J2EE框架的酒店管理系统。系统采用了B/S软件体系结构,后台数据库采用SQLServer2005,对系统需求进行分析,对系统架构、系统功能等进行设计,以应用为...Hotel accommodation is to provide visitors with accommodation, entertainment, leisure places for the entire hotel industry, to play a decisive role in the business situation, and thus in the hotel management to effectively improve the operation of the hotel is essential. This article discusses how to implement a hotel management system for effective management of the hotel's business conditions an...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323108

    创新高校网络思想政治教育工作的对策

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    网络思想政治教育是针对人的精神层面的教育,是对人的意识形态的培育、规正和强化, 是利用外界影响人的意识的一种方式。网络已经成为高校思想政治工作的重要阵地,网络对学生产生了深刻的影响。创新高校网络思政教育工作应该坚持以马克思主义为指导的原则、从客观实际出发的原则、发展的原则。着重致力于网络思想教育平台建设、高校网络思想政治教育队伍建设、不断开拓网络思想政治教育方法、也要致力于规范网络环境,为高校网络思想政治教育创造良好的氛围

    Field map-based rectification of susceptibility distortion and signal compensation in diffusion tensor imaging

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    目的采用基于体素的场图对磁共振弥散张量成像(diffusion-tensor; imaging,DTI)进行几何变形矫正及信号补偿研究,扩大DTI临床研究及应用价值。材料与方法获取29名健康人脑场图,分别对其DTI进行相位反; 卷积计算及信号校准补偿,将结果配准到3D结构图像。选择对磁场敏感的双侧颅底额叶和颞叶作为观察脑区,对磁场不敏感的丘脑作为对照脑区,对部分各向异性; (fractional; anisotropy,FA)值及信号的差异及其与结构像的形态差异进行统计分析。结果在颅底额叶和颞叶,DTI的磁敏感变形得到了矫正,因场不均性导致; 的信号损失得到了补偿。结论高场中DTI的畸变及体素信号丢失可应用场图的校准得到明显矫正,有利于进一步扩大高场DTI在临床中的应用价值。Objective: This study was designed to employ the voxel-based field map; to rectify the geometric deformation and compensate the signal loss of; diffusion tensor imaging (DTI), and thus facilitate the studies and; clinical applications of DTI. Materials and Methods: Brain field maps; from 29 healthy persons were first used to get B1 field heterogeneous; signals, and then the compensation and phase disconsolation of signals; were performed. Finally, the geometry deformations of DTI were rectified; and registered to 3D images. Magnetic sensitive bilateral temporal lobes; and frontal lobes were selected as regions of interesting and meanwhile,; magnetic insensitive thalamus was selected as control area. Results:; Geometry deformations of DTI produced by different susceptibilities; between specific tissues were completely rectified, and thus the signal; loss was compensated and the accuracy of DTI was significantly enhanced.; Conclusion: Signal compensations and deformation rectifications can be; well achieved using field map, which may improve the applications of DTI; in neurosurgery.国家自然科学基金面上项

    分析师发布现金流预测的动机研究——基于信号传递理论的研究视角

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    基于2008-2017年我国卖方分析师发布的研究报告数据,考察分析师内在能力与其额外发布现金流预测的关系。研究结果表明,高能力的分析师更倾向于在发布盈余预测的同时发布现金流预测,目的是向外传递与自身能力有关的信号。因此,对于还未获得良好声誉的非明星分析师,其内在能力越高,额外发布现金流预测的概率越大。研究还表明,对于机构投资者持股比例高的公司,分析师的内在能力与其额外签发现金流预测报告之间的正向关系更为显著。另外,分析师性别、学历、获取私有信息的能力及证券公司与上市公司的利益关联都会影响分析师内在能力与额外发布现金流预测的关系。国家自然科学基金项目“分析师额外签发现金流预测报告的动机和经济后果——基于信号传递的视角”(71462012);国家自然科学基金项目“媒体地域属性、媒体报道倾向与上市公司投融资行为”(71462011);国家自然科学基金项目“媒体传闻、公司澄清与经济后果性研究”(71802101

    Experimental study of using GSPS for in situ osteogenesis induction on rabbit skull

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    目的:研究明胶-硅氧烷多孔支架材料混合多种材料用以原位诱导兔颅骨再生的效果。方法:采用可降解、具有双孔径的明胶-硅氧烷多孔支架材料,并复合bMP2和兔骨髓间充质干细胞,在去骨瓣减压手术时将材料置于骨窗上,同时采用空白对照来探讨兔颅骨原位诱导再生。用高速螺旋CT扫描颅骨并三维重建来测量颅骨缺损的愈合情况,并作出比较。结果:支架材料+bMP组动物的颅骨修复率与支架材料+红骨髓组动物的修复率相当(P=0.43);支架材料+红骨髓组动物的颅骨修复率高于单纯支架材料组动物的修复率(P=0.01);单纯支架材料组动物的颅骨修复率与空白对照组动物的修复率无明显差别(P=0.18)。结论:明胶-硅氧烷-CA(nO3)2多孔复合支架材料分别与bMP以及红骨髓混合使用能够明显提高颅骨缺损的骨愈合速度以及修复率;而单纯使用支架材料并不能促进实验动物的颅骨修复。Objective:To investigate the effect of using GSPS for in situ osteogenesis induction on rabbit skull.Methods:The biodegradable,with double-aperture gelatin -siloxane porous scaffold materials was mixed with BMP2 or rabbit bone marrow mesenchymal stem cells to fix the skull bone deficit after craniectomy decompression.A blank control was set to compare with the effect of in situ osteogenesis of rabbit skull.High-speed spiral CT scanning and three-dimensional reconstruction of the skull was performed to inspect the healing progress of skull defects.Results:The GSPS + BMP group had the equal bone healing rate as the GSPS+ bone marrow group (P=0.43); and the GSPS + bone marrow group had the higher bone healing rate than the GSPS group (P =0.01).There were no significant difference on bone healing rate between GSPS group and blank control group (P=0.18).Conclusion:Gelatin-siloxane-Ca (NO3) 2 porous scaffolds could be used with the BMP,as well as red bone marrow to improve the bone healing of skull bone defect while no significant effect could be observed using GSPS solely

    Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells

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    紫外LED的发光功率和效率还远不能令人们满意,波长短于300 nm的深紫外LED的发光效率普遍较低。厘清高Al组分Al Ga N多量子阱结构的发光机制将有利于探索改善深紫外LED的发光效率的新途径、新方法。为此,本文通过金属有机气相外延技术外延生长了表面平整、界面清晰可辨且陡峭的高Al组分AlGa N多量子阱结构材料,并对其进行变温光致发光谱测试,结合数值计算,深入探讨了Al Ga N量子阱的发光机制。研究表明,量子阱中具有很强的局域化效应,其发光和局域激子的跳跃息息相关,而发光的猝灭则与局域激子的解局域以及位错引起的非辐射复合有关。The quantum efficiency of deep UV light emitting diodes( LED) drops dramatically with the increasing of Al content. Understanding the emission mechanism of high Al-content Al Ga N multiple quantum wells( MQW) is the one of the most important objects for improving the quantum efficiency of deep UV LED. In this work,high Al-content Al Ga N MQW structure with atomically flat hetero-interfaces was grown and characterized by photoluminescence( PL) measurements at different temperatures. The results indicate that there is a strong exciton-localization effect in the MQW structure and the emission is closely related to the hopping of the excitons. Due to the exciton delocalization and nonradiative recombination at defects,the PL intensity is strongly quenched at high temperatures.“973”国家重点基础研究发展计划(2012CB619300);; “863”国家高技术研究发展计划(2014AA032608);; 国家自然科学基金(U1405253;61227009;11204254;11404271);; 福建省自然科学基金(2015J01028)资助项

    转型期中国金融排斥困境及其对县域经济发展的影响——基于中国2 574个县(市)数据的空间分析

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    文章以中国2 574个县(市)为样本,采用空间计量分析方法刻画我国县域金融排斥的空间分布特征,量化其对县域经济发展的影响。研究发现:金融排斥在地理分布上具有显著的空间正相关关系,即不仅对本县(市)的经济发展具有显著的负面影响,还对其他县(市)有显著的负溢出效应;东部地区金融排斥的空间分布以低—低集聚和低—高集聚为主,而中西部地区则以低—高集聚为主,其中,中部地区形成了以高金融排斥集聚区包围多经济中心的空间分布格局,而西部地区则呈现出大片高金融排斥集聚区包围单经济中心的空间格局;发达地区地方政府的干预限制了金融集聚的空间溢出效应,使落后地区(特别是农村地区)长期陷入金融排斥的不利境地。研究不仅为普惠金融战略的精准实施提供了大样本的直观证据,还以典型地区为样本,深入分析了金融排斥的地区分布特征以及对地区经济的影响,为制定针对性更强的应对措施提供政策参考。中央高校基本科研业务费专项项目“‘一带一路’建设民心相通框架下孔子学院跨文化传播研究”(2018CDXYJG0040)重庆大学研究生重点课程建设项目“高级计量经济学”(201805055

    脑型肝豆状核变性脑皮层及皮层下核团体积的磁共振研究

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    目的探索脑型肝豆状核变性患者脑灰质的损害。材料与方法采集30例初发且未经治疗的脑型肝豆状核变性患者脑3D T1WI图像,利用FSL软件,运用基于体素的形态学测量(voxel_based morphometry,VBM)对脑皮层...国家自然科学基金项目(编号:81671674、81871519)~
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