Syntheses、Structures and Characterizations of the Sulfur-protected Metal Compounds

本论文分为两部分。第一部分采用配体L1与银盐在常温下反应，利用阴离子模板法得到了三种不同的银簇合物，分别为Ag3、Ag7和Ag19，并对其晶体结构和相关性质进行了分析测试。结构分析表明Ag3、Ag7和Ag19三个簇合物中均存在Ag-Ag弱金属键，且在引入S原子后，PPh3的配位方式不变。其中Ag7和Ag19结构中均存在Ag3S3环六核银结构。Ag7为链状结构，作为桥梁的银原子和Ag19中同样作为桥梁的银原子与配体S原子的连接方式不同，这也是导致Ag19不是链状而是呈“W”链状的原因。由Ag7与Ag19的合成发现，金属与配体的比例，加入阴离子的量都会对引起结构上的差异。L1配体中S趋向μ2，μ1...The research contains two parts. In part one, three different Ag clusters compounds with ligand L1 under room temperature using anion template method were synthesised. They were Ag3, Ag7 and Ag19, and the structures and properties of which have been characterized. Structure analysis showed that they all exist Ag-Ag weak metallic bond, and when introduce S as the coordination atom, the coordination...学位：理学硕士院系专业：化学化工学院_无机化学学号：2052013115154

Anticorrosion Properties of Modified Nano-TiO_2 Films Prepared by Sol-Gel Method

应用溶胶-凝胶法和浸渍提拉技术在316l不锈钢表面分别制备TIO2纳米膜和 b-fE-CE改性的TIO2纳米膜. 采用场发射扫描电子显微镜(fE-SEM)、原子力显微镜(AfM)、拉曼光谱法和能量分散谱(EdS)对薄膜进行表征,通过电化学阻抗谱(EIS)和动电位阳极极化曲线的测试考察薄膜的耐蚀性及对不锈钢的保护性能. 结果表明:两种纳米薄膜均含锐钛矿型的TIO2纳米颗粒,纯TIO2纳米膜与改性后的纳米膜中颗粒直径分别约为15和10 nM. TIO2/316l不锈钢和 b-fE-CE-TIO2/316l不锈钢膜电极浸泡在0.5 MO.ll-1 nACl溶液后,后者的电化学反应电阻较大,动电位阳极极化曲线的稳定钝化区较宽,击穿电位更高,说明改性的纳米膜的耐蚀性及其保护性能更好.TiO2 and B-Fe-Ce-modified TiO2 films were synthesized on the surfaces of 316L stainless steel(316L SS) substrates using a sol-gel and dip-coating method.The properties of the films were characterized by field emission scanning electron microscopy,atomic force microscopy,Raman spectroscopy and energy dispersive spectrometry.The corrosion resistance of the films and their ability to protect stainless steel were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization curves.Both TiO2 and B-Fe-Ce-modified TiO2 films were composed of anatase nanoparticles about 15 and 10 nm in diameter,respectively.Impedance spectra of the stainless steel substrates coated TiO2 films contained semicircles for capacitive reactance in 0.5 mol.L-1 NaCl solution,but the charge transfer resistance of the B-Fe-Ce-TiO2/316L SS electrode was higher than that of the TiO2/316L SS electrode.The potentiodynamic anodic polarization curve of the B-Fe-Ce-TiO2/316L SS electrode showed a larger stable passive region and a higher breakdown potential than the TiO2/316L SS electrode,indicating that the modified film had better corrosion resistance and protective properties for 316L SS.国家高技术研究发展计划项目(863)(2009AA03Z327);国家自然科学基金(21073151和21173177)资助---

三种检测方法对样品中沙门氏菌的检测结果比较

本实验采用VIDAS、API20E和SN0170-92三种不同的检测方法对CNCA举行的食品中常见致病菌能力验证计划中提供的一份盲样进行检验,总结对比了3种不同检验方法对沙门氏菌检测的各自优缺点

貌合神离：中英文同款广告的符号和眼动分析

通过一系列中英文同款广告，该研究结合符号和眼动技术，指出相似的表象之下，微妙的细节调整如何折射出中西方读者对媒介内容叙述方式的不同偏好，以及处理群己关系的不同价值取向，从而呈现出“貌合神离”的警民、亲子、师生、夫妻、男女等社会关系。本文系国家自然科学基金项目“东西方不同文化思维方式对广告说服的影响：一个自下而上的脉络建构与验证”（项目编号：71372076）的阶段性研究成果

SNX14 deficiency-induced defective axonal mitochondrial transport in Purkinje cells underlies cerebellar ataxia and can be reversed by valproate

共济失调是一类以运动协调性紊乱为主要特征的神经系统症状，临床表现包括步态不稳、丧失平衡、吞咽困难、眼球运动异常、肌张力受损等。厦门大学医学院神经科学研究所王鑫教授团队首次从轴突线粒体运输这一全新视角揭示了一类遗传性共济失调的发病机制，并发现抗癫痫药--丙戊酸大幅度减缓模型小鼠的疾病进程，具有较强的转化应用价值，有望为共济失调提供新的治疗手段。 该研究工作由王鑫教授指导完成，厦门大学医学院助理教授张洪峰和博士生洪育娟共同完成主要实验工作。Loss-of-function mutations in SNX14 cause autosomal recessive spinocerebellar ataxia 20, which is a form of early-onset cerebellar ataxia that lacks molecular mechanisms and mouse models. We generated Snx14-deficient mouse models and observed severe motor deficits and cell-autonomous Purkinje cell degeneration. SNX14 deficiency disrupted microtubule organization and mitochondrial transport in axons by destabilizing the microtubule-severing enzyme spastin, which is implicated in dominant hereditary spastic paraplegia with cerebellar ataxia, and compromised axonal integrity and mitochondrial function. Axonal transport disruption and mitochondrial dysfunction further led to degeneration of high-energy-demanding Purkinje cells, which resulted in the pathogenesis of cerebellar ataxia. The antiepileptic drug valproate ameliorated motor deficits and cerebellar degeneration in Snx14-deficient mice via the restoration of mitochondrial transport and function in Purkinje cells. Our study revealed an unprecedented role for SNX14-dependent axonal transport in cerebellar ataxia, demonstrated the convergence of SNX14 and spastin in mitochondrial dysfunction, and suggests valproate as a potential therapeutic agent.We thank Tim Huang for helpful discussion, Wei Mo for sharing mouse lines, Li Zhong for sharing reagents, Aidong Han, Luming Yao, Caiming Wu, Mingxia Zhu, Qingfeng Liu, Lin Zhu, Shuo Zhang, Haiping Zheng, and Changchuan Xie for technical assistance, and Cui Li for providing bioinformatics software. We also thank Novogene Co., Ltd. and PTM Biolab Co., Ltd. for technical assistance in the transcriptomic and proteomic analyses, respectively. 厦门大学医学院许华曦、赵颖俊、张云武、杜丹教授在研究过程中给予大力帮助和支持。本研究工作得到国家重点研发计划项目、国家自然科学基金、福建省自然科学基金、厦门大学校长基金的资助和支持

生物氧化作用对砷酸铁结晶影响的研究

砷是一种剧毒元素,在有色金属矿物中普遍存在。这些矿物的冶炼过程中有大量含砷废渣和废液产生,处理不当会对人类和生态环境造成严重污染。由于砷和含砷化合物缺乏足够的市场需求,现有含砷废弃物的处理方法主要是将其中的砷转化成性质稳定的</p

一种粒径可调控的磁性纳米颗粒的制备方法

本发明提供了一种粒径可调控的磁性纳米颗粒的制备方法，采用化学热分解法，首先使用有机物与部分或全部金属前驱体混合发生络合反应，使其中至少部分金属前躯体与有机物发生络合反应，以改变该部分金属前驱体在后续化学热分解反应中的分解速度，然后将络合反应后的混合溶液与反应溶剂、其余金属前驱体，以及表面活性剂混合形成反应体系，将该反应体系升温进行化学热分解反应，反应后进行恒温保持、离心分离，得到磁性纳米颗粒。该方法中，只需调整参与络合反应的有机物的使用量，而其他反应条件保持不变，即能实现磁性纳米颗粒粒径的调控，并且调控范围能够达到0.5nm，因此是一种高精度粒径可调控的磁性纳米颗粒的制备方法，具有良好的应用前景

L(2,1)-labelings of the local-edge-path-replacements of Cartesian products(Cartesian积的局部边-路替换图的L (2，1)-标号)

设d为正整数，图G的一个L(d,1)-标号就是从非负整数集到V(G)的一个函数，且使得2个相邻顶点的标号相差至少是d,2个距离为2的顶点的标号相差至少为1.图G的L(d，1)-标号的跨度就是所有L（d，1）-标号的最大值和最小值之差.图G的L(d，1)-标号数是G的所有L (d,1)-标号下跨度的最小值.在已有研究图G的边-路替换图的L(d,1)-标号基础上，研究了 Cartesian积的局部边-路替换图的L(2，1)-标号