Effect of Nitrogen and Sulfur Fertilizer on Granule Size Distribution, Composition and Pasting Properties of Wheat Starch

为明确氮硫肥对小麦淀粉粒度分布及主要理化特性的影响,以强筋小麦品种西农9718和中筋品种陕农138为材料,采用不同氮硫肥水平进行处理,系统分析了小麦A、B淀粉的粒度分布、淀粉组成、膨胀势及糊化特性对氮硫肥的响应。结果表明,强筋和中筋小麦品种的淀粉粒度分布基本一致。A淀粉粒体积分布占总淀粉的74.95%～75.43%,但淀粉粒数量远少于B淀粉粒。A淀粉的直链淀粉、峰值黏度、低谷黏度、崩解值、最终黏度以及回生值高于B淀粉,而B淀粉有更高的支链淀粉、膨胀势和糊化温度。不同氮硫肥处理改变了小麦淀粉的粒度分布,进而影响淀粉的组成和糊化特性。在施氮（230kg.hm-2）条件下,强筋品种西农9718和中筋品种陕农138的A、B淀粉分别在硫肥施用量为46和56kg.hm-2时有较低的直链淀粉含量、较高的膨胀势及较好的糊化特性。陕农138淀粉的粒度分布、组成及糊化特性对氮硫肥的响应比西农9718更敏感。适当的氮、硫肥配施有利于改善小麦的淀粉品质。     

GPC-RI-MALLS技术测定羟乙基淀粉的分子量及分子量分布

羟乙基淀粉是一种优良的血浆代用品,作者介绍了用凝胶渗透色谱(GPC)-示差检测(RI)-多角度激光光散射(MALLS)联用技术测试羟乙基淀粉的分子量和分子量分布的实验技术,给出了测试折光指数增量dn/d c值、分子量和分子量分布实验步骤和方法,并对其分析测试过程中的关键实验技术及实验结果进行了详细的讨论.该方法以CH3COOH/CH3COONa溶液作为流动相,实验获得了满意的结果,可作为羟乙基淀粉分子量和分子量分布测试的常规分析方法.     

分子量分布对聚丙烯力学性能的影响

研究了分子量及其分布对注射成型聚丙烯样条的密度，结晶度、拉伸性能、冲击性能的影响，不同分子量与分子量分布的聚丙烯样品由化学控制降解制得，用数学方法分析了实验数据与分子量分布之间的量化关系。     

苯甲基化木材溶液相对分子质量及其分布

以四氢呋喃为溶剂将苯甲基化木粉溶液化，并利用凝胶渗透色谱考察了不同溶液化条件对液化产品的分子量及分子量分布的影响。实验结果表明，木材经苯甲基化改性后，其溶解性能得到很大的提高，在该实验条件下，苯甲基化木材的增重率是影响液化产品分子量及分子量分布的主要因素，且增重为142．5％的木粉，其液化产品分子量分布较窄；在此增重条件下，溶剂用量增大会导致液化产品分子量增大，分布变窄；催化剂的选择直接影响了苯甲基化木材的溶液化历程，相同用量时，盐酸作催化剂液化产品的分子量较低且分布较窄；溶液化时间对液化产品的分子量及其分布影响较小。     

马铃薯成分及其淀粉的功能特性分析

以4种主粮化品种马铃薯为研究对象,分别研究了马铃薯的营养成分及其淀粉的糊化性质、膨胀度、溶解度、冻融稳定性等功能特性.研究结果表明,不同品种马铃薯的营养成分含量不同;不同品种马铃薯淀粉膨胀度和溶解度与温度有关,均随着温度升高而增大;不同品种马铃薯淀粉经一次冻融后析水率也有差异,析水率随冻融循环次数的增加而逐渐增大;不同品种马铃薯淀粉直链淀粉质量分数不相同.     

甜菜高分子量核DNA的分离

研究了从甜菜中分离高分子量核DNA的方法．利用离心分离细胞核，经低融点琼脂糖块包埋、蛋白酶K原位裂解，结合低融点琼脂糖脉冲电泳去除淀粉制备高分子量核DNA．结果表明利用幼叶制备高分子量核DNA分子量高，更容易去除其中的淀粉；并且利用该方法得到的高分子量核DNA纯度高，适于部分酶切．     

醇酸树脂分子量分布及性能研究

本文用高效凝胶色谱法(HPGPC),蒸汽压渗透法(VPO),酸价(AV),格氏管粘度(ηG)及漆性能测试等手段对比研究了工业生产配方的长油醇酸树脂催化酯化工艺与原高温酯化工艺过程中分子量(Mw),分子量分布(MWD)的变化规律及其与树脂性能的关系,实验表明:两种工艺过程中分子量分布具有相似的规律,lgMw 和 lgd 与反应程度 P,重均分子量 Mw 与分散度 d 及 lgηG 与 Mw 之间均呈现良好的线性关糸,在达到相同分子量和分布时,催化新工艺所需时间比原工艺缩短.反应温度也比原工艺为低.在相同反应程度下,固体酸催化醇酸树脂具有较低的粘度和较好的贮存穗定性,表明两种工艺树脂可能具有不同的分子构型.在相同粘度下固体酸催化醇酸树脂的漆膜硬度及干性均比原工艺树脂优异是由于其分子量较大所致。     

不同磷素水平对小麦淀粉粒形态及品质特性的影响

磷是小麦生长过程中重要的大量元素之一,对小麦籽粒产量和淀粉品质的形成有重要作用。为探讨磷素对小麦胚乳淀粉粒积累及其对淀粉品质特性的影响,本研究以新疆主栽的中强筋冬小麦品种新冬20号和新冬23号为参试材料,研究不同施磷水平(P0:P2O50 kg/hm2;LP:P2O5105 kg/hm2;HP:P2O5210 kg/hm2)对小麦籽粒灌浆过程中淀粉粒形态、粒径分布、淀粉降解酶活性以及淀粉持水力、膨胀势、溶解度和破损淀粉含量的影响。结果表明:不同施磷水平下2个参试品种的淀粉粒均为明显的双向分布,淀粉粒的基本形态特征未改变,但对2个小麦品种A-和B-型淀粉粒的发育进程有不同程度的影响。高磷和低磷处理下2个小麦品种籽粒α-淀粉酶活性在灌浆后期(花后28-35 d)最高,且变幅较大。高磷处理下新冬20号小麦淀粉的持水力、膨胀势和溶解度均显著高于对照;高磷和低磷处理可显著增加新冬23号小麦淀粉的持水力。不同施磷量对小麦淀粉品质的影响与参试品种的遗传特性有关,从淀粉粒形态和品质特性变化的角度,相对于新冬23号,新冬20号小麦对磷素更敏感。     

用于制备热塑性塑料的双醛玉米淀粉的研究

采用高碘酸钠在温和条件中氧化玉米淀粉，制备不同醛基含量的双醛玉米淀粉，通过红外光谱和核磁表征产物.考察双醛玉米淀粉的分子量、结晶、形貌以及疏水性能的变化. 以甘油为增塑剂制备得到热塑性玉米双醛淀粉塑料具有良好的综合性能.     

不同品种马铃薯淀粉及其直链淀粉、支链淀粉含量的测定

对甘肃省主要种植马铃薯品种的淀粉含量以及淀粉中直链淀粉和支链淀粉的比例进行了定量分析与比较.结果表明:不同品种马铃薯淀粉中直链淀粉和支链淀粉含量不同,由此造成不同品种马铃薯淀粉性质的差异.     

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     

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