细胞色素C在SAM修饰电极上的电化学行为

应用循环伏安法研究了细胞色素c在2-氨基乙硫醇自组装膜修饰金电极上的电化学行为。结果表明，细胞色素c在2-氨基乙硫醇修饰的金电极上的电子传递过程为—扩散控制的可逆反应，2-氨基乙硫醇自组装膜可用作细胞色素c电子传递的有效促进剂。依据电化学石英晶体微天平和电化学交流阻抗谱的测量结果，讨论了单分子膜的组装过程及其对促进细胞色素c电子传递的作用机制。     

纳米火棉胶膜自组装细胞色素c的直接电化学研究

用纳米火棉胶膜将细胞色素c固定在玻碳电极表面,制备了细胞色素c-火棉胶膜修饰电极.吸附在火棉胶膜上的细胞色素c可以与电极发生直接电子传递.在pH=7.0的0.1mol/LPBS缓冲溶液中可得到一对准可逆的细胞色素c的血红素辅基Fe(Ⅲ)/Fe(Ⅱ)电对氧化还原峰,实验求得细胞色素c异相电子传递速率常数k0为65.4μm/s.进一步考察了扫速、溶液pH值等因素对细胞色素c电子传递的影响,并用电化学阻抗法研究了修饰电极的电化学行为.     

细胞色素C在葡聚糖修饰金电极上的直接电化学

本文对细胞色素C在葡聚糖修饰金电极上的直接电化学进行了研究,发现萄聚糖是细胞色素C电化学反应的有效促进剂,并对影响萄聚糖修饰金电极的稳定性的因素作了探讨.     

细胞色素C/L-半胱氨酸修饰电极的电化学行为研究

采用自组装修饰法将细胞色素C修饰到以L-半胱氨酸为连接剂的金电极上,并运用循环伏安法(CV)、电化学阻抗法(EIS)等方法研究了该电极的电化学行为.测定了细胞色素C有关的电化学参数.     

左旋多巴在纳米材料修饰界面上的电子传递

利用多壁碳纳米管(MWNTs)和量子点(QDs)作为修饰材料,采用简便的干燥吸附法制备玻碳修饰电极(GCE),构造了纳米材料修饰界面,采用循环伏安法和计时库伦法对左旋多巴的电化学行为进行了探讨.发现该电化学行为是一个两电子两质子的过程.该修饰电极能很好地催化左旋多巴的电化学行为,能够有效地促进它与电极之间的电子传递,有良好的电化学响应.其在修饰电极上的异相电子传递速率常数为0.595 cm·s~(-1),比在裸GCE和MWNTs修饰GCE上有很大提高.这很可能是由于QDs和MWNTs之间存在着某种协同作用,提高了MWNTs对左旋多巴的电化学催化能力所致.这一研究结果为在纳米复合修饰电极上研究生物小分子的电化学催化提供了一种新途径.     

细胞色素C在醇修饰金电极上的直接电化学

细胞色素Ｃ是一种金属蛋白酶，在生物体内起着电子传递体的作用，细胞色素Ｃ在金属电极上的氧化还原反应极不可逆，但是它在促进剂修饰的电极上却显示出较高的可逆性。本对细胞色素Ｃ在丙三醇，乙二醇，甲醇等醇修饰金电极上的直接电化学反应进行了研究，发现不同的醇分子对细胞色素Ｃ的促进作用各不相同，结合糖分子的促进作用，探讨了醇上羟在数的多少对其促进作用的影响。     

细胞色素C修饰电极的制备和性能研究

通过自组装法,把血红蛋白细胞色素C固定于导电聚合物(聚谷氨酸)层,制作成一种微型生物传感器,检测其对过氧化氢和亚硝酸钠的响应.实验发现谷氨酸具有一定的电化学活性,循环伏安图在-0.35 V和-0.05 V出现一对氧化还原峰,而且细胞色素C修饰电极对亚硝酸钠响应所得循环伏安图表明,随着亚硝酸钠加入量增大,还原峰增大.通过吸附法修饰电极,把血红蛋白细胞色素C固定于电极表面,探究修饰电极在对苯二胺中的钝化情况.实验表明:细胞色素C修饰电极可以避免电极钝化的发生.细胞色素C作为一种蛋白酶,使对苯二胺处于氧化状态,从而防止电极表面膜的形成,避免电极钝化的发生.     

甲醛在聚苯胺修饰分散铂电极上的电催化氧化

用循环伏安法和恒电位法在铂电极上分别制备了分散铂电极、聚苯胺修饰电极及聚苯胺修饰分散铂电极，并用循环伏安法研究了制备电极在0．5mol／L H2SO4溶液中的电化学行为以及对甲醛氧化的催化行为，分散铂电极对甲醛氧化的最大电流是6．48mA，是基体电极(0．075mA)的86．4倍，聚苯胺修饰分散铂电极对甲醛氧化的最大电流(15．12mA)是基体电极的201．6倍，分散铂电极的2．3倍，分散铂对甲醛氧化的催化作用不仅仅是铂面积增大的结果，还存在纳米效应，聚苯胺修饰铂电极对甲醛氧化的催化除存在铂进一步分散使面积进一步增大的因素外，还存在铂与聚苯胺的协同作用。     

血红蛋白在染料修饰电极上的快速电化学氧化

本文报道了在灿烂甲酚兰吸附修饰铂电极和在澳邻苯三酚红内层吸附、灿烂甲酚兰外层修饰铂电极上血红蛋白的电化学还原和氧化过程。首次发现并报道了修饰层中的澳邻苯三酚红能促进血红蛋白的不可逆电化学氧化过程。     

甲醇在铂微粒修饰的玻碳电极上的电催化氧化

利用循环伏安法等电化学方法研究了甲醇在铂微粒修饰的玻碳电极上的电催化氧化，结果表明，铂微粒修饰玻碳电极(GC—Pt)对甲醇电化学氧化呈现较高的催化活性，活化后的玻碳电极再修饰铂微粒表现更高的催化活性，其催化活性的大小与铂载量有关，同时测定了甲醇电催化氧化反应的动力学参数。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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