中和渗析法中部分氨基酸的传质过程研究(英文)

对甘氨酸、丙氨酸和丝氨酸在中和渗析法中的传质行为进行了研究,渗析结果表明,它们在等电点处的传质速率最大,对这种现象,可通过定量比较不同的pH条件下甘氨酸在离子交换膜上的浓度来予以解释,取决于溶液pH值的甘氨酸传质速度与所计算出的在不同pH条件下与阴、阳离子交换膜交换的甘氨酸浓度相一致。     

黄河水中甘氨酸对铅(Ⅱ)与表层沉积物相互作用的影响

研究了黄河水中甘氨酸对铅(Ⅱ)与表层沉积物相互作用的离子交换率E%—pH的影响.实验结果表明:①在2×7.73×10-3mmol·L-1甘氨酸存在下,离子交换率降低;②随着甘氨酸浓度的增加,S型曲线与未加甘氨酸相比,先左后右移动;③甘氨酸存在下,转型表层沉积物比自干表层沉积物离子交换率高.     

微波辐射条件下Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)与甘氨酸配合物的固相合成、表征及应用

该文研究了Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)的乙酸盐与甘氨酸在微波辐射及室温条件下的固--固相配位化学反应,通过固相反应一步合成了Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)与甘氨酸的配合物,经电导率、IR、UV及元素分析表征了产物,并用微波产物进行了植物助长试验.     

Cu(Ⅱ)-二肽络合物的EPR研究

研究了Ｃｕ（Ⅱ）与部分二肽：甘氨酸甘氨酸（ＧｌｙＧｌｙ）．甘氨酸苏氨酸（Ｇｌｙ－Ｔｈｒ），甘氨酸苯丙氨酸（ＧｌｒＰｈｅ），甘氨酸酪氨酸（ＧｌｙＴｙｒ）的络合物在不同ｐＨ下的７７ Ｋ和室温（２９８Ｋ）的ＥＰＲ谱。发现Ｃｕ（Ⅱ）与含芳香氨基酸残基和不含芳香氨基酸残基的二肽络合物的ＥＰＲ 谱有明显的差别．不同ｐＨ下的ＥＰＲ谱亦有变化．在Ｃｕ（ Ⅱ）－ＧｌｙＧｌｙ和 Ｃｕ（ Ⅱ）－ＧｌｒＴｙｒ中，其室温 ＥＰＲ谱出现了五条氮核的超超精细裂分线，但在 Ｃｕ（Ⅱ）－ＧｌｙＧｌｙ和 Ｃｕ（Ⅱ）－ＧｌｙＴｈｒ的 ＥＰＲ谱中没有出现。分可见苯环侧链对络合物ＥＰＲ谱中氮的超越精细结构的出现起重要作用。     

甘氨酸预处理对中华羊茅热胁迫下幼苗生长和氧化损伤的影响(英文)

研究了甘氨酸预处理对降低中华羊茅幼苗热胁迫的保护性作用.甘氨酸预处理降低了活性氧水平,保护了热胁迫下幼苗细胞膜的完整性,因而降低了植株根系细胞的死亡率.研究表明:甘氨酸预处理可以提高幼苗超氧化物歧化酶(SOD),过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)的活性.半定量RT-PCR分析表明甘氨酸预处理幼苗中CAT基因的表达比对照高.讨论了抗氧化酶活性在甘氨酸调节热胁迫中的作用.     

2-氯苯甲醛甘氨酸席夫碱及其Cu(Ⅱ)、Zn(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)配合物的合成、表征及抗菌活性研究

报导了2-氯苯甲醛甘氨酸席夫碱及其Cu(Ⅱ),Zn(Ⅱ),Co(Ⅱ),Ni(Ⅱ)配合物的合成方法,并通过元素分析、热重-差热分析、红外光谱、电子光谱、核磁共振谱、摩尔电导等方法对配体及配合物进行了表征。抗菌活性试验表明,4种配合物对浅部真菌均有较强的抗菌作用。     

甘氨酸-Zn(Ⅱ)络合物力常数的计算

本文以甘氨酸－金属络合物作为研究复杂分子蛋白质－金属相互作用的模拟物质，在４０００－２５０ｃｍ－１的范围内测定了水－反二甘氨酸 Ｚｎ（Ⅱ）络合物的红外光谱，并用 ＧＦ矩阵法，采用ＵＢＦ力场近似模型，计算了甘氨酸 Ｚｎ（Ⅱ）络合物的振动力常数。计算的结果为： Ｚｎ—Ｎ， Ｚｎ—Ｏ伸缩力常数具有相同的数值，都等于 ０．７５ｍｄｙｎ／Ａ，我们还进行了红外谱带的归属工作，把该络合物的Ｚｎ—Ｎ与Ｚｎ—Ｏ伸缩振动分别归属为４５０ｃｍ－１和２８５ｃｍ－１ 根据计算的结果，我们探讨了第一过渡金属与甘氨酸的络合物中Ｍ－Ｎ和Ｍ－Ｏ伸缩力常数跟它们的稳定性常数之间的关系，结果表明，它们伸缩力常数的大小顺序跟稳定性的Ｉｒｖｉｎｇ—Ｗｉｌｌｉａｍｓ顺序一致的。 为计算力常数，编制了计算机程序，并在ＤＪＳ—１３０计算机上完成了本工作。     

镁(Ⅱ)-甘氨酸-水三元配合物结构和性质的理论研究

为认识金属离子的生物功能,采用CCSD/6-31++G**∥M06/6-31++G**理论方法系统研究了三元配合物[Mg(Gly)(H2O)n]2+的结构和性质.气相模型下得到的结果为:1)O,O双啮型两性甘氨酸的配位能力最强,比N,O双啮型中性甘氨酸的配位能力强37.6kJ/mol,比2个水分子强约60kJ/mol;2)与Mg2+配位时,O,O双啮型两性甘氨酸优先,结合能达到-669.1kJ/mol;随后4个水分子依次配位,结合能变化值递减,平均为159.1kJ/mol,此时配位键达到饱和数6,体系的结合能达到-1 305.4kJ/mol;3)第5个水分子可通过强氢键(键能为85.5kJ/mol)作用于体系得到次稳定构型,结合能为-1 390.9kJ/mol;也能插入到甘氨酸的O原子与Mg2+之间,取代甘氨酸的1个O原子与Mg2+形成配位键,导致甘氨酸变为单啮配体,这样得到的构型最稳定,结合能达到-1 393.1kJ/mol.液相模型下的构型结构与气相模型相比变化微小,能量次序与气相结果相同.     

不同方法制备的Ce0.8Sm0.2O1.9(SDC)性能对比

分别采用沉淀法、凝胶辅助的固相反应法和甘氨酸-硝酸盐法制备了钐掺杂的氧化铈材料,结果表明,用后两种方法制备的粉体能够满足固体电解质的要求,其中,凝胶辅助的固相反应法制备的粉体粒度约为20~100nm,甘氨酸-硝酸盐法制备的粉体粒度更小,表现为许多超细纳米颗粒的团聚体.二者烧结体的致密度分别可以达到95%和97%,800℃时的电导率分别为0.071S/cm和0.074S/cm.     

[Cu(OOCCH_2NHCH_2PO_3H_2)_2·(H_2O)_2]·H_2O的合成与表征

用N－（膦酸甲基）甘氨酸与醋酸铜在强酸性和煮沸条件下,合成了铜（Ⅱ）与N－（膦酸甲基）甘氨酸的配合物．经红外光谱、紫外光谱、热谱、磁化率等表征,并用凝固点降低法测定了分子量．结果表明,该配合物是由两个水分子和两个N-（膦酸甲基）甘氨酸中的两个氮原子与铜（Ⅱ）形成的配合物,其化学式为：［Cu（OOCCH2NHCH2PO3H2）2·（H2O）2］·H2O．     

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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