树莓色素的提取及稳定性研究

对树莓色素的提取方法以及光、热、氧化剂H2O2、还原剂Na2SO3，食品添加剂，常见金属离子等对其稳定性的影响进行了研究。结果表明树莓色素有较好的光热稳定性，常见食品添加剂和常见金属离子对其稳定性无明显影响。     

山楂红色素的理化性质

报道了山楂红色素的稳定性，受高温加热及强光照射时的变化，以及一些金属离子、有机酸、氧化剂、还原剂、糖类、食品添加剂对山楂红色素稳定性的影响。结果表明，山楂红色素在酸性条件下稳定，对于光有良好的稳定性，氧化剂、还原剂及抗坏血酸对色素有一定的降解作用；柠檬酸对色素有明显的增色作用；糖类、除Fe^3＋、Sn^2＋的金属离子及苯甲酸钠对色素的稳定性没有影响。     

橙子果汁中色素的理化性质研究

通过实验,对橙汁果汁色素理化性质做了初步的探索,研究金属离子,氧化剂及还原剂,常用的食品添加剂,酸碱和光照对色素的影响,结果表明：金属粒子、低浓度的氧化剂和还原剂对色素的影响不大;不同食物添加剂对色素有不同的增色或消色作用;色素对光敏感,随着光照时间的增加稳定性减弱．     

化学添加剂对紫甘蓝色素稳定性的影响

以食用紫甘蓝菜为原料,用pH值为2的盐酸溶液浸提得到紫甘蓝色素.着重研究了蔗糖、柠檬酸、抗坏血酸、金属离子、氧化剂、还原剂对紫甘蓝色素稳定性的影响.结果表明:紫甘蓝色素水溶性好,在酸溶液中很容易被提取.该色素在酸性条件下对常用的食品添加剂蔗糖、柠檬酸具有较好的稳定性;金属离子Fe3+、Sn2+、氧化剂、还原剂对色素的稳定性影响较大.     

牵牛花色素稳定性研究

研究了氧化剂、还原剂、部分食品添加剂、金属离子对牵牛花色素稳定性的影响，并对其影响结果进行了讨论     

月见草花黄色素的稳定性测定

研究了光、热、酸、碱、氧化剂、还原剂、金属离子、蔗糖、Vc等添加剂对用95%乙醇浸提的月见草花黄色素溶液稳定性的影响,结果表明：该色素易溶于95%的乙醇、无水乙醇、丙酮、乙酸乙酯等溶剂.对光、热、碱、氧化剂、金属离子（Na+,Ca2+,Mg2+）及添加剂有一定的稳定性,而对酸、还原剂的稳定性不太好,Cu2+和Fe3+对色素溶液有一定的影响.     

落葵色素性能的测定

研究氧化剂、还原剂、部分食品添加剂、金属离子对落葵色素稳定性的影响,并对其影响结果进行了讨论．     

红叶甜菜中色素的提取及稳定性研究

研究了红叶甜菜叶片中提取红色素的最佳条件，并就光、热、氧化剂、还原剂、食品添加剂和金属离子对色素稳定性的影响进行了讨论．     

光照和食品添加剂对紫玉米芯色素稳定性的影响

考察了在酸性条件下光照、氧化剂、还原剂、食品添加剂对紫玉米芯色素稳定性的影响;结果表明:阳光直射加速紫玉米芯色素的降解;强氧化剂双氧水对紫玉米芯色素的褪色作用最明显,其次是抗坏血酸、苯甲酸钠和还原剂无水亚硫酸钠;蔗糖对紫色玉米芯色素的稳定性影响不大,高浓度蔗糖溶液还具有增色作用;提示紫玉米芯色素,在食品工业中具有较好的开发利用价值.     

山城紫苕色素稳定性的初步研究

主要研究pH值、温度、光照、金属离子及其它食品添加剂和氧化剂对山城紫苕色素稳定性的影响．实验结果表明：紫苕色素在pH=3．0左右,降解缓慢；对光、热都较稳定；除Fe^3 、Sn^2 外，大多数离子影响较小；常用食品添加剂影响也很小；强氧化剂对其有破坏作用．     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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