斯达油酯酵母U9018胞外多糖的理化性质

报道斯达油脂酵母Ｕ９０１８以蔗糖为基质产生的胞外多糖的一些理化性质，胞外多糖由Ｄ－甘露糖、Ｄ－半乳糖和Ｄ－葡萄糖醛酸组成，三种单糖的含量比值为１：１：１，单糖为吡喃型糖，该多糖在低浓度时有较高的粘度，且粘度随浓度或加热温度的提高而增大，２０℃下０．５％浓度的多糖溶液可形成凝胶，１．５％浓度的多糖深液形成的凝胶强可达２１．６５ｇ／ｃｍ＾２，凝胶无色透明，Ｕ９０１８多糖对黄原胶有显差的增粘作用。     

斯达油脂酵母U9018胞外多糖的理化性质

报道斯达油脂酵母Ｕ９０１８以蔗糖为基质产生的胞外多糖的一些理化性质．胞外多糖由Ｄ－甘露糖、Ｄ半乳糖和Ｄ－葡萄糖醛酸组成，三种单糖的含量比值为１：１：１，单糖为毗喃型糖．该多糖在低浓度时有较高的粘度，且粘度随浓度或加热温度的提高而增大，２０℃下，０．５％浓度的多糖溶液可形成凝胶，１．５％浓度的多糖溶液形成的凝胶强度可达２１．６５ｇ／ｃｍ￣２，凝胶无色透明，Ｕ９０１８多糖对黄原胶有显着的增粘作用．     

灵芝多糖微凝胶的制备与性质测定

通过美拉德反应和蛋白加热凝胶化获得了微凝胶,并将灵芝酸载入其中.首先通过美拉德干热反应制备卵白蛋白-灵芝多糖复合物,然后在pH=4.5和85 ℃的条件下加热复合物溶液30 min得到了微凝胶,其平均粒径约100 nm并呈单分散性分布.在酸性条件下由于卵白蛋白和灵芝酸之间存在较强的疏水作用,微凝胶中灵芝酸的包封率高于90%,同时灵芝多糖有利于防止蛋白分子之间的宏观聚集.原子力显微镜表明,微凝胶粒子基本呈球形.微凝胶在4 ℃下具有良好的贮存稳定性.     

食用菌中多糖与锌离子配合工艺优化

采用食用菌为原料,采用微波辅助热水解提取法提取出复合多糖,并用凝胶树脂对提取液中复合多糖进行纯化.对复合多糖与锌离子配合反应及产物进行初步的探讨研究.确定最佳的反应条件为反应温度为60℃、反应时间为60 min、p H值为9.0,在此条件下,锌离子∶多糖配合比为1∶1(物质的量比).采用红外光谱对产物进行了表征.     

多糖复配技术对凝胶性能的影响

研究了魔芋葡甘露聚糖、卡拉胶、黄原胶等三种多糖之间的复配作用, 同时探讨了温度、时间、浓度、电解质各因素对凝胶性能的影响.结果表明: 多种多糖通过分子间力产生交互作用, 对多糖的凝胶性能(如凝胶强度、凝胶弹性)等具有良好的增效性.当魔芋葡甘露聚糖、卡拉胶、黄原胶三者共混质量比为1:0.4:0.2 (即 5.6%:2.2%:1.1%), 多糖总质量分数为9%, 温度为90℃、凝胶时间为10小时, K 浓度为1.0%时, 凝胶强度可达到最佳.     

多糖及多糖衍生物/泊洛沙姆温敏水凝胶的制备及其性能研究

为了改善泊洛沙姆温敏水凝胶的性能,用5种不同化学结构的多糖及多糖衍生物与泊洛沙姆制备温敏水凝胶,研究这些多糖的化学结构对水凝胶性能的影响。结果表明多糖及多糖衍生物与泊洛沙姆在接近体温(34~37℃)时形成水凝胶,有利于实现可注射使用的目的。两亲性多糖衍生物/泊洛沙姆温敏水凝胶的稳定性更高,体现出更强的剪切变稀性质,缓释疏水性药物—强的松的时间更长,这些性质可能与两亲性海藻酸钠衍生物和两亲性壳聚糖衍生物与泊洛沙姆之间存在疏水相互作用力有关。5种温敏水凝胶体均表现出促进成骨细胞增殖生长的性能,在骨关节组织具有一定的应用前景。     

固体发酵9519紫芝菌丝体多糖分子量的分布

紫芝茵丝体多糖含有多个多糖组分，其分子量分布范围很宽，用不同乙醇浓度先分级沉淀多糖，再用Sephaclex G-100葡萄糖凝胶柱分离纯化不同分子量的多糖组分．结果表明：50％乙醇浓度沉淀多糖含有单一多糖组分，60％乙醇浓度沉淀多糖主要含有三个多糖组分，70％乙醇浓度沉淀多糖主要含有二个多糖组分，85％乙醇浓度沉淀多糖含有一个多糖组分．     

多糖定量检测的研究进展

本文综述了多种多糖定量检测的方法,可分为两大类：一类是直接测定多糖本身,如高效液相色谱法、高效毛细管电泳法、凝胶渗透色谱法等;另一类间接测定法,是利用测定组成多糖的单糖来完成定量。     

柘树根多糖的分离纯化及组成初步研究

以柘树（Cudrania tricuspidata （Carr.） Bur.）的根为材料，经热水抽提、木瓜蛋白酶-Sevag法除蛋白、乙醇沉淀和凝胶柱层析分离纯化，得到1种水溶性的柘树根多糖（CTP）并研究了其单糖组成. 采用紫外光谱和红外光谱法对柘树根多糖进行了定性分析，结果表明，柘树根多糖具有多糖特征性的紫外和红外吸收峰，不含糖醛酸；高效凝胶渗透色谱法测定结果表明，柘树根多糖的峰值分子量为18881；采用气相色谱法测定柘树根多糖中单糖的种类和构成比例，结果表明，柘树根多糖主要由葡萄糖、阿拉伯糖、半乳糖、木糖等4种单糖组成，并计算出4种单糖的摩尔组成比例.     

NF—1菌胞外多糖的制备及其结构初步分析

报道了NF－1菌胞外多糖的分离纯化工艺，并对其结构做了初步分析，即反复用水溶、乙醇沉淀法得到粗多糖，然后经两根Sepharose CL-4B凝胶层析柱分离纯化，所得多糖纯度用蒽酮比色法测定。红外光谱分析表明，该多糖呈β－糖苷链连接。     

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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