L-半胱氨酸自组装膜修饰电极对抗坏血酸的电催化氧化及其分析应用

研究了L-半胱氨酸自组装膜修饰电极(L-Cys/Au SANs)的制备方法和其电化学行为,发现该电极对抗坏血酸(AA)具有明显的电催化氧化作用,在pH 4.03的BR缓冲溶液中,AA在L-半胱氨酸自组装膜修饰电极上产生一灵敏的氧化峰,峰电流与AA浓度分别在8.0×10-7-8.0×10-6mol·L-1和4.0×10-5-4.0×10-4 mol·L-1范围内呈良好的线性关系,相关系数分别为0.997 0和0.996 7,检测限为1.6×10-7mol·L-1.该方法可用于AA的测定.     

二甲基亚砜中Co2+、Ni2+和Fe2+的电化学行为

研究了二甲基亚砜中Co2+、Ni2+和Fe2+电化学行为. 在1.00×10-2 mol·L-1CoCl2-0.1 mol·L-1LiClO4-DMSO、1.00×10-2mol·L-1NiCl2-0.1 mol·L-1LiClO4-DMSO和1.00×10-2 mol·L-1FeCl2-0.1 mol·L-1LiClO4-DMSO体系中利用循环伏安法和计时电流法测定3种体系中Co2+、Ni2+和Fe2+的扩散系数DO. 结果在304 K时,循环伏安法测定3种体系中Co2+、Ni2+和Fe2+的扩散系数DO分别为1.31×10-5、1.27×10-5和1.59×10-5 cm2*s-1;在299 K时,计时电流法测定Co2+、Ni2+和Fe2+的扩散系数DO分别为1.01×10-5、1.43×10-5和1.39×10-5 cm2·s-1.     

邻菲罗啉的电化学性质研究

0.5 mol·L-1的一氯乙酸和0.1 g·L-1的十二烷基磺酸钠溶液中,邻菲啰啉有一灵敏极谱峰,其峰电位是-0.75 V(vs.SCE).峰电流与邻菲啰啉的浓度在4.0×10-7～3.8×10-5mol·L-1范围内呈线性关系(r=0.998 5),检测下限为2.0×10-7mol·L-1.利用线性扫描极谱法和循环伏安法研究了邻菲啰啉的电化学性质.     

催化极谱法快速测定硫磺中微量碲

采用硫化铵快速分解硫磺试样,在16.56 mol·L-1NH3·H2O-0.21 mol·L-1酒石酸钠-3.01×10-4mol·L-1Pb-1.50×10-2mol·L-1EDTA-0.12mol·L-1Na2SO3-3.2×10-4mol·L-1HNO3体系中以催化极谱法测定微量碲.极谱峰电位为-1.10V(VS·SCE).碲浓度在4～100ng/mL-1范围内与峰电流有良好的分段线性关系.检出下限为4ng·mL-1.方法的RSD为1.9%～2.3%,加标回收率为90.10%～96.00%.该法操作简便快速,用于硫磺样品的测定结果满意.     

对叔丁基杯[6]芳烃修饰玻碳电极对镉离子的分子识别

将杯[6]芳烃衍生物修饰到玻碳电极表面制成化学修饰电极,研究了在酸性介质中的伏安特性,并探讨了伏安性能对金属离子的识别.结果表明:修饰电极在0.1mol·L-1的HAc溶液中对镉离子有很灵敏的伏安响应.线性范围为7.0×10-9~3.0×10-7mol·L-1,检出限为2.7×10-10mol·L-1.     

光谱法研究诺氟沙星与DNA的作用

利用荧光光谱和紫外光谱研究了诺氟沙星(NFA)与DNA作用.实验结果表明,DNA以静态猝灭的方式使得诺氟沙星的荧光强度显著降低,NFA在浓度为5.86×10-7～1.95×10-6mol·L-1时,体系的荧光强度与DNA的浓度在一定范围内存在着线性关系,其中在NFA浓度为5.86×10-6mol·L-1时,存在最宽的线性范围,DNA的浓度为2.0×10-5～2.22×10-4mol·L-1.确定了最佳反应条件,该方法简便快速,背景干扰小,对于合成样品中DNA测定结果令人满意.     

洛美沙星的吸附伏安特性及其应用

在Britton Robinson(pH8 80 ) 0 0 2mol·L- 1KCl底液中 ,洛美沙星 (Lomefloxacin ,简称LMF)在汞电极上有一线性扫描还原峰 ,峰电位Ep=- 1 4 0V (vs.Ag/AgCl) ,该峰具有明显的吸附性 .吸附粒子为LMF中性分子 ,测得LMF在汞电极上的饱和吸附量Гs=4 2 7× 10 - 11mol·cm- 2 ,每个LMF分子所占电极面积为 3 89nm2 ,LMF在汞电极上的吸附符合Langmuir吸附等温式 .测得吸附系数 β =2 2 9× 10 6,2 5℃时的吸附自由能ΔG =- 36 2 9kJ·mol- 1,电极反应电子数n =2 ,不可逆体系动力学参数αnα=1 84 ,表面电极反应速率常数ks=0 2 9s- 1,扩散系数D =7 38×10 - 7cm2 ·s- 1.建立了吸附溶出伏安法测定LMF的最佳条件 ,检出限为 5 0× 10 - 8mol·L- 1.     

槲皮素修饰碳糊电极吸附溶出伏安法测定血清中的铅

建立了用槲皮素修饰碳糊电极吸附溶出伏安法测定血清中的铅的方法.在浓度为0.10mol·/L的甲酸钠-盐酸缓冲溶液(pH=4.3)中,于-0.10V(vs.SCE)搅拌富集,再在-0.70V静止还原40s后,阳极化扫描.于-0.42V左右获得一灵敏的铅阳极溶出峰.在最佳条件下,富集不同的时间,其二阶导数峰电流与铅离子在1.0×10-8-8.0×10-7mol·/L和2.0×10-9-6.0×10-8mol·/L两个范围内呈线性关系,检出限为6.0×10-8mol·/L,同时对电极反应机理进行了讨论.     

金属杂多酸聚吡咯修饰电极的制备及应用

在圆盘电极上 ,用电化学方法将单缺位 Dawson型金属取代磷钨杂多酸盐 [α2 - K8P2 W17O61(Ni( ) OH2 )· 17H2 O,α2 - K8P2 W17O61(Co( ) OH2 )· 16 H2 O]的阴离子 (P2 W17)掺杂到聚吡咯 (PPy)薄膜中 ,制成 PPy/ P2 W17/ GC化学修饰电极 .研究电极对 NO-2 电还原过程的催化机理 .其还原电流 ipc值与 NO-2 浓度在 7.4 1× 10 -6～ 8.2 4× 10 -5mol· L-1和 1.74× 10 -4～ 1.2 1× 10 -2 mol· L-1范围内 ,呈良好的线性关系 .其中检测下限为 3.10× 10 -7mol· L-1,可用于酸雨中 NO-2 的测定     

噻唑橙在表面活性剂介质中聚合状态的光谱研究

应用紫外 可见吸收光谱和荧光光谱研究了噻唑橙染料水溶液在阴离子表面活性剂存在下聚集状态及光谱性质 .当添加阴离子表面活性剂浓度在 10 - 5mol·L- 1 范围时 ,噻唑橙易发生二聚乃至三聚 .当阴离子表面活性剂浓度大于 10 - 3 mol·L- 1 并达到临界胶束浓度时 (对于十二烷基苯磺酸钠 ,cmc =8.3× 10 - 3 mol·L- 1 ) ,噻唑橙完全解聚为单体 .其荧光强度高于水溶液 ,而多聚体的荧光强度较低 ,最大发射波长发生红移 ,光稳定性降低     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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