香菇多糖Le-2的化学修饰对SP-2小鼠肿瘤细胞抑制率的影响

研究了香菇多糖化学修饰的结构变化及对SP-2小鼠肿瘤细胞体外抑制率的影响。分别对香菇多糖Le-2进行硫酸酯化和羧甲基化修饰,利用红外光谱和DSC测定Le-2硫酸酯化和羧甲基化前后的结构变化;通过检测吸光度值(A值)计算抑瘤率。结果表明Le-2硫酸酯化和羧甲基化的取代度分别为0.87和0.47,回收率分别为88.6%和83.6%;硫酸酯化香菇多糖对SP-2小鼠肿瘤细胞的抑制率最高为51.88%,其次为羧甲基化香菇多糖抑制率为48.28%。硫酸酯化和羧甲基化能明显提高Le-2抑制SP-2小鼠肿瘤细胞的活性。     

泌阳花菇栽培技术研究

介绍了泌阳花菇栽培技术,给花菇生产提供依据参考,主要是对在泌阳香菇生产中如何通过改进香菇生产管理方法,提高香菇的花菇率和优质花菇的产量进行了研究.采取了科学措施,在较佳的试验条件下花菇率达到80%以上.     

废弃芦蒿秸秆多组分分离提取工艺设计及优化

芦蒿秸秆是一种农业废弃物,因其富含纤维素、半纤维素、木质素和其他成分而具有巨大的资源潜力。以芦蒿秸秆为原料,系统研究了芦蒿秸秆中的黄酮类物质和木质纤维素三组分的分离方法。首先采用乙醇溶液回收黄酮组分;然后采用微波乙醇法对芦蒿秸秆进行脱木质素预处理,同时使用Na OH溶液溶解并结合醇沉过程回收半纤维素;最后使用酸性亚氯酸钠溶液提纯纤维素。在最优条件下,黄酮提取率达到1. 61%;木质素、半纤维素、纤维素的回收率分别达到59. 34%、72. 94%、80. 64%;纤维素经两次提纯处理后纯度高达93. 8%。该分离方法为芦蒿秸秆的综合利用提供了一条可行的路线。     

化学实验中含铬废水的处理

将含铬废液浓缩后,在弱碱性条件下沉淀过滤.沉淀在酸性条件下加热溶解氧化后再次过滤分离沉淀,两次滤液合并.用稀硫酸调节pH为7～8,蒸发水份,并冷却到室温结晶,再经重结晶提纯得到产品重铬酸钾.经分析,产品纯度达96%以上.     

关于Azumaya定理

本文证明了下述定理:若M为Le-分解模,则下述条件等价:(Ⅰ)M的每一极大直和项有唯一补;(Ⅱ)如K为M的任一非零直和项,则有B(?)A使K=(?)Mβ     

4-正戊基-4′-氰基三联苯的合成研究

以三联苯为原料 ,经 Friedel- Crafts反应 (收率 80 % )、还原反应 (收率 6 0 % )、碘代反应 (收率 5 5 % )、氰化反应 (收率 6 0 % ) ,制得 4-正戊基 - 4′-氰基三联苯。与以前的合成方法相比 ,在还原反应温度上做了较大的改变 ,在最终产物提纯方面进行了优化 ,减少了合成步骤 ,操作简单 ,提纯方便 ,提高了收率。     

十六胺乙基磺酸钠的合成和性能研究

以十六胺和溴乙磺酸钠为原料合成了十六胺乙基磺酸钠,用单因素优选法研究了影响反应的因素,优化反应条件为n(十六胺)∶n(溴乙磺酸钠)=1.0∶1.3,反应温度80℃,反应时间7.0h,pH值9.0~10.0,产物质量收率89.64%,提纯后纯度93.25%,并对十六胺乙基磺酸钠的应用性能进行了测定.     

硝酸尾气中氮气的提纯

经过实验测定某公司化肥厂硝酸车间所产生硝酸尾气的主要成分为：2.5%H2O、5.5%O2、0.02%NOx。因此,利用PSA法脱除硝酸尾气中氮氧化物,同时,可提纯纯度大于98.5%的氮气。经反复试验得出,提纯氮气、脱除氮氧化物的最佳条件。     

果蔬和谷物制品中多菌灵的免疫检测

基于多菌灵多克隆抗体,建立快速、高效、灵敏的直接竞争酶联免疫吸附测定(CD-ELISA)方法检测果蔬和谷物中的多菌灵残留,对反应条件进行优化,绘制CD-ELISA标准曲线.以橙子、橙汁、黄瓜、小麦和香菇为检测材料,经酸化乙腈(醋酸和乙腈体积比为1∶99)提取,提取液用PBSB缓冲液稀释20倍即可用于CD-ELISA方法检测.分别利用CD-ELISA法和高效液相色谱法对香菇和小麦进行检测,比较二者的检测结果.利用CD-ELISA法对橙子、橙汁、黄瓜、小麦和香菇的30个样品进行多菌灵残留检测.结果表明:优化反应条件并消除基质影响后,CD-ELISA校正曲线的检测限为(0.30±0.15)μg/L,灵敏度为(2.70±0.30)μg/L.采用有机试剂提取和PSA净化的简单前处理后,用CD-ELISA法检测5种果蔬和谷物样品中的多菌灵含量,其添加回收率为84.3%～112.7%,变异系数小于12.3%.CD-ELISA法对香菇和小麦的多菌灵检测结果与高效液相色谱法的检测结果呈线性正相关,相关系数为0.993 3.30个样品CD-ELISA检测结果显示,多菌灵检出率为30%,超标率为3.33%.这些结果表明,构建的CD-ELISA法具有较高的灵敏度、精密度及准确度,可以作为快速检测食品中多菌灵残留的方法.     

月桂酸单异丙醇酰胺羧酸盐的合成及性能

为进行脂肪酸烷醇酰胺类表面活性剂研究,以月桂酸单异丙醇酰胺(LMIPA)为原料,通过羧甲基化法合成新型阴离子表面活性剂月桂酸单异丙醇酰胺羧酸盐(LMIPA-EC),对其合成条件进行探索,并测试其性能。结果表明:以80%氯乙酸溶液,固体NaOH的方式加料,配料比nLMIPA∶nClCH2COOH∶nNaOH=1∶1.5∶2.0,反应时间为3.5 h,反应温度为70℃左右较佳,在该实验条件下获得了81%的收率,经提纯后月桂酸单异丙醇酰胺羧酸盐的纯度可达92%;通过红外光谱对其结构进行了定性分析;同时测定了月桂酸单异丙醇酰胺羧酸盐的性能,测定结果表明:LMIPA-EC为性能比较优良的阴离子表面活性剂。     

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