迎春花多糖提取工艺研究

采用正交试验法研究迎春花多糖的提取工艺,考察了浸提温度、浸提时间、浸提次数、液料比4个因素对迎春花多糖提取率的影响．确立了迎春花多糖最佳提取条件为：液料比40：1,浸提温度为70℃,回流提取3次,提取时间为每次40min．     

满天星水溶性多糖提取及抗氧化活性研究

考察了水提法提取满天星水溶性多糖的工艺条件和体外抗氧化活性．采用L9（3^4）正交试验方法,研究了料液比、浸提温度、浸提时间、提取次数对提取效率的影响．在选定的工艺条件下,料液比和提取温度对满天星水溶性多糖提取率的影响大于提取时间、提取次数的,料液比和提取温度为主要影响因素;最佳工艺条件为料液比1：20、提取温度80℃、提取时间1．5h、提取次数三次．在最佳工艺条件下测得满天星粗多糖提取率为1．83％．体外抗氧化活性试验表明,满天星水溶性多糖能有效地清除DP—PH自由基,当满天星多糖浓度在0．30mg／mL以上时,对DPPH自由基的清除率超过81％．     

新疆枸杞子中多糖的提取及含量测定

对新疆枸杞子进行多糖的提取及含量测定.用水提醇沉法从新疆枸杞子中提取水溶性多糖,通过苯酚-硫酸比色法在490nm波长处测定多糖含量.提取过程中通过单因素试验分析了乙醇浓度、浸提温度、料液比及浸提时间等因素对多糖提取率的影响.在单因素试验的基础上,通过正交设计法优化新疆枸杞子中多糖提取工艺条件,确定了多糖的最佳提取工艺条件为：乙醇浓度为80%、浸提温度为90℃、料液比为l∶50、浸提时间为2.5h、浸提次数为3次.在此条件下,回归方程A=6.8316C＋0.03,R=0.9993,葡萄糖在7~49μg/mL范围内,呈良好的线性关系,f因子为3.79（RSD=1.24%,n=3）,多糖含量为7.37%（RSD=0.38%,n=3）,回收率为96.96%（RSD=1.87%,n=3）.所用方法快速、准确、灵敏,可作为枸杞子中多糖含量的测定方法.     

Study on extraction of polysaccharose in basil and deterination of its content

实验采用传统的碱提取多糖方法,并设计了4因素3水平正交试验对罗勒中多糖的得率进行了对比研究。考察了不同提取温度、料液比、提取时间等对多糖含量的影响,得到最佳的提取工艺是碱浓度1．0mol·L^-1,温度70℃,提取时间60min以及料液比1：60,在此条件下测得罗勒中多糖含量为26．87％。     

正交法优化茶籽饼粕中茶皂素的提取工艺

采用正交实验法,从提取时间、温度、乙醇浓度、液料比4个因素出发对从茶籽饼粕中提取茶皂素的工艺进行了研究．以茶皂素得率和含量为指标,得出茶皂素的最佳提取条件为：浸提时间为5h,浸提温度为70℃,乙醇浓度为80％．料液比为9：1．     

盐肤木果实多糖提取工艺研究

采用热水浸提法从盐肤木果实中提取多糖,研究了料液比、提取时间、提取温度对盐肤木果实多糖提取率的影响,采用L9（3^4）正交试验设计,筛选出最佳提取工艺。结果表明：盐肤木果实多糖水提法最佳提取工艺条件为浸提温度70℃、浸提时间4h、料液比1：60。     

金针菇多糖最佳提取工艺研究

研究了金针菇(Flammulina velutipes)多糖的最佳提取工艺条件。通过实验，探讨了浸提次数、时间、温度及pH对提取效果的影响。结果显示：当料液比为1：20，温度为90℃，pH值为8，浸提时间为90min时提取效果最佳，多糖得率为0．833％。采用上述条件，在超声仪中进行超声波提取，20min时可达到最佳效果，多糖提取率为1．250％。     

方格星虫多糖水法提取的条件及优化

分别从料液比、浸提时间、浸提次数、浸提温度等4个方面初步研究水法提取方格星虫体壁中的水溶性多糖的条件及优化.在单因素试验结束后,通过正交试验取四因素三水平得到方格星虫水溶性多糖水提法的最佳组合.结果：影响方格星虫多糖提取率的主次顺序为浸提温度＞料液比＞浸提时间＞浸提次数,最佳的浸提条件为：温度100℃,料液比1∶12 g/mL,浸提时间3h,浸提次数4次.在最优浸提条件下,方格星虫水溶性多糖水提法所得的最佳提取率为1.22％.该工艺稳定可行,能有效提高方格星虫多糖的提取率.     

热水法对水溶性红枣多糖提取工艺的研究

本试验以红枣为主要原料,采用热水提取法提取其中的水溶性红枣多糖,其最适工艺条件为加水量4倍,浸提时间3h,浸提温度90℃,浸提2次,此条件下水溶性红枣多糖的提取率最大为3．91％。     

萝卜水溶性多糖的提取工艺研究

探讨以萝卜为原料提取水溶性多糖的最佳工艺条件,实验结果表明：萝卜水溶性多糖的最佳工艺条件为料液比1：12,提取时间4h,提取3次,温度为90℃,此条件下多糖得率为1．477％．     

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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