手掌参多糖的结构分析

从传统蒙药手掌参(GymanadeniaConopseaR.Br.)的干燥根茎中用热水提取、醇析方法直接得到不含蛋白质的纯手掌参多糖(GCP).采用Smith降解法、高效液相色谱法分析GCP的糖苷键连接方式,采用13CNMR、红外光谱分析法对其结构进行分析.结果表明,GCP主要是以1→3位和部分1→4位键合的糖苷键,红外光谱分析和1HNMR测定表明GCP糖苷键为β-吡喃型糖.     

壳聚糖浸根对辣椒生长及坐果的影响

用重均分子量Mw分别为3.8×105 、4.8×104、5.4×103 和2.3×103壳聚糖的溶液对辣椒幼苗进行浸根处理后移栽.研究结果表明:低分子量壳聚糖(Mw 2.3×103 和 5.4×103) 浸根移栽辣椒幼苗能明显改善其根系的发育,促进植株生长,提高坐果率,增加产量, 且适宜浓度为0.5%和1%;而低分子量壳聚糖2%～4%浓度处理及高分子量(Mw 4.8×104和3.8×105)壳聚糖1%浓度处理对移栽植株生长坐果的促进效果不明显.     

H2O2/FeCl3在缺电子类烯烃自由基聚合中的应用研究

介绍了一种用于缺电子类烯烃自由基聚合的引发体系,此引发体系使用H2O2和FeCl3两种经济、环保的原料,实现了丙烯酸、甲基丙烯酸等水溶性单体在水中的自由基聚合,同时实现了丙烯腈在水中的连续水相沉淀聚合及在DMSO、DMF中的自由基聚合.结果表明,该引发体系在较低的引发剂浓度和较低的反应温度(30～60℃)下,合成的聚丙烯酸钠分子量在1.0×106～2.0×106之间,聚甲基丙烯酸钠分子量在1.0×105～1.7×105之间,且均具有较低的分子量分布(Mw/Mn=1.1～1.4)和较好的转化率(90%);合成的聚丙烯腈分子量在2.0×104～8.0×104之间,转化率最高可达94.1%.     

好氧完全混合式反应器中水力停留时间对溶解性微生物产物的影响

以葡萄糖为底物,采用10 L完全混合式反应器研究了进水COD为1 000、1 500和2 000mg/L条件下水力停留时间对出水中溶解性微生物产物(SMP)的量、分子量分布和组成成分的影响。在进水COD相同条件下,溶解性微生物产物的量随着水力停留时间延长呈下降趋势。水力停留时间相同时,进水COD越高产生的溶解性微生物产物的量越多。随水力停留时间的延长,小分子量(Mr<1×103)部分溶解性微生物产物所占百分比呈现先减小后增加的趋势;中间分子量(1×1031×104)部分则逐渐减小。水力停留时间对溶解性微生物产物中的多聚糖和蛋白质含量有显著影响,对DNA含量没有显著影响。随着水力停留时间的延长,多聚糖和蛋白质能够逐渐降解。     

铬(Ⅵ,Ⅲ)和3,5-Br_2-PADAP的络合反应及其在水质分析中的应用

经实验发现2-(3,5-二溴- 2-吡啶偶氮)- 5- 二乙氨基苯酚(简称 3,广-Br2 - PADAP)与六价铬和三价铬在加热的情况下均生成稳定的络合物,其摩尔吸光系数分划为8.6×104 和7.7× 104 ,为目前分光光度测定铬的最灵敏方法之一。 我们就络合物的形成条件、性质、组成及反应机理作较为详细的研究。实验表明,络合物形成的最佳酸度为PH3 .3-4.0.Cr(Ⅵ)的络合物组成为Cr(Ⅵ)。R=1:1;Cr(Ⅲ)的络合物组成为Cr(Ⅱ):R=1:2。络合物的最大吸收波长位于592纳米处,而且吸收光谱极为相似。 络合物在弱酸性介质中形成之后甚为稳定。实验表明络合物不被2N的…     

超低分子量聚丙烯酰胺的水溶液聚合

采用水溶液聚合法合成了超低分子量聚丙烯酰胺。探讨了反应温度、单体浓度、链转移剂、引发剂等因素对聚合物分子量的影响。确定了在单体浓度为30.0%,反应温度为80～90℃,链转移剂浓度为(2.0～6.0)×10-2mol/L,引发剂浓度为(3.5～18.0)×10-3mol/L的实验条件下,获得了分子量为(2.6～10.0)×104的聚丙烯酰胺产品。     

紫外分光光度法测定马来酸含量

建立了直接在水中测定马来酸含量的紫外分光光度法.采用水作为参比,在水溶液中于211 nm处测定马来酸的含量,其表观摩尔吸光系数为ε211=1.39×104 L/(mol·cm).本法简便、快速,应用于多批马来酸含量的测定,其加标回收率在94.0%～102.3%之间,获得了比较满意的实验结果.     

铜(Ⅱ)-二溴邻羧基偶氮氯膦显色体系性质研究

采用双波长β修正光度法研究铜(II)-二溴邻羧基偶氮氯膦(DBOK-CPA)显色体系,在中性条件下所生成络合物组成比Cu∶DBOK-CPA为1∶2.配合物的各级真实吸光系数和稳定常数均被测得,在630nm下络合物真实摩尔吸光系数ε=1.49×104L.mol.cm-1,络合物累积稳定常数K=8.58×109(15℃和离子强度0.01).     

茯苓液体培养法中羧甲基茯苓多糖(CMP)的提取、纯化及鉴定

对茯苓菌株HD06-10 进行液体发酵培养,采用醇沉法从其发酵液中提取羧甲基茯苓多糖(CMP).用DEAE-32 纤维素和SephadesG-200 对 CMP 进行柱层析分离提纯,得到主要组分PG.通过紫外光谱和红外光谱对组分PG进行纯度鉴定,结果表明:PG为多糖纯品,未检测出核酸、蛋白质等杂质,仅由羧甲基葡萄糖组成. PG 是β构型的葡聚糖,糖环为吡喃型,糖苷键的连接方式为β (1→3)及β (1→6),分子量大约为4.2×104Da.     

氟碳表面活性剂复配体系的起泡性能研究

探讨了磺基甜菜碱氟碳表面活性剂(FS)与阴离子碳氢表面活性剂(AOS)复配体系组成、浓度、无机盐、有机溶剂等因素对复配体系泡沫性能的影响,结果表明:FS与AOS协同效应好,起泡和稳泡能力强.与AOS最佳复配比为FS:AOS=1:5,质量分数为0.2%.当NaCl、CaCl2、MgCl2浓度分别为8×104、2×103、4×104 mg·L-1时,起泡性能和泡沫稳定性仍较好,在煤油含量30%时起泡性能和泡沫稳定性仍较好,还研究了无机盐对复配体系泡沫耐油性能的影响.     

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