枸杞水溶性粗多糖提取及组成分析

从枸杞中提取水溶性粗多糖，对粗多糖进行乙醇分级，得三个级分：LBP-Ⅰ、LBP-Ⅱ、LBP-Ⅲ，其中LBP-Ⅰ收率高，对LBP-Ⅰ组成分析表明其单糖组成为Rha、Gal、Xyl、Ara、Fuc、G、Rib。     

北极海参多糖的分离纯化及抗肿瘤活性研究

采用人肺癌细胞A549、人胃癌细胞SGC-7901、人乳腺癌细胞MCF-7及人胰腺癌细胞PANC-1共4种癌细胞株,通过MTT法研究北极海参多糖组分的体外抗肿瘤活性;利用胃蛋白酶、胰蛋白酶连续水解制备海参粗多糖,用sephadex G-50及DEAE-52分离纯化,得到Ⅱ-ⅠC、Ⅱ-ⅠD和Ⅱ-ⅠE 3种精制多糖;对3种精制多糖的组成及性质进行分析。结果表明:3种精制多糖对4种肿瘤细胞的抑制作用明显强于粗多糖,且与多糖质量浓度正相关;3种精制多糖对MCF-7的抑制作用最强,对A549的抑制作用相对较弱;实验浓度(0.02、0.04、0.06、0.08、0.10 mg/m L)下,Ⅱ-ⅠD和Ⅱ-ⅠE对A549的抑制作用显著强于Ⅱ-ⅠC;Ⅱ-ⅠD对MCF-7、SGC及PANC-1的抑制作用强于Ⅱ-ⅠE和Ⅱ-ⅠC;3种精制多糖的质量分数均大于93%,为不含肽链及核酸的β-吡喃构型,硫酸根的质量分数为31.52%~32.67%。单糖组成分析显示,3种多糖均属于海参硫酸软骨素。     

酶法提取百合多糖及其体外抗氧化活性

研究了热水法及复合酶法提取百合多糖（LBP）的最佳条件, 对两种方法得到的多 糖的生物活性进行了比较分析. 发现复合酶法能显著提高百合多糖的提取率, 可达31.03% , 是热水法的2.85倍. 复合酶法提取的多糖在体外抗氧化活性如对O^－₂ ·及·OH的抑制作用、 对H₂O₂诱导的人血红细胞氧化溶血 的抑制作用及人红细胞膜脂质过氧化的抑制作用均显著高于热水法提取的多糖. 经Sephadex G-75柱层析对粗多糖进行分离, 得到3种组分, 其中活性组分LBP-3主要存在于酶法提取 的多糖中, 测得该活性组分的分子量为13 400.     

弯斑蛸多糖纯化及对小鼠脾细胞增殖的影响

将弯斑蛸粗多糖COG经精制得POG,再通过离子交换和凝胶柱层析纯化,经化学法和红外光谱确定主要组成和结构特征,用MTT比色法测定脾细胞的增殖.结果表明:柱层析得到的POGⅠ、POGⅡ和POGⅠ-1总糖含量在26.3%~42.2%之间,总糖胺聚糖含量均高于30%,葡萄糖醛酸含量接近20%,红外光谱提示均具有典型的糖胺聚糖特征;各多糖对小鼠脾细胞增殖均有明显的促进作用,纯度最高的POGⅠ-1促进作用最强.该弯斑蛸多糖为氨基己糖和葡萄糖醛酸组成的多糖,具有增强免疫作用.     

金樱子果实中多糖的提取与分离纯化

目的：从金樱子果实中提取与纯化多糖。方法：用热水提取金樱子果实粗多糖，经Sevage脱蛋白，透析后经DEAE-Sepharose Fast Flow，和CM—Sepharose Fast Flow柱色谱分离纯化金樱子粗多糖；经高效液相色谱法测定其相对分子量；进行完全酸水解研究多糖的组成。结果：得到两个金樱子多糖组分RLPSⅠ、Ⅱ，其相对分子量分别为22712和16051；初步确定RLPS Ⅱ由D—半乳糖、D—甘露糖和木糖组成。结论：从中药金樱子中提取分离出了两个多糖。     

川明参多糖的抗突变性研究——对环磷酰胺诱发蚕豆根尖细胞微核的影响

研究了川明参多糖Ⅰ和川明参多糖Ⅱ对环磷酰胺诱发蚕豆根尖微核细胞的抗性作用，结果表明，川明参多糖Ⅰ的抗突变作用较川明参多糖Ⅱ强     

野西瓜多糖分离纯化及其质量浓度研究

研究了野西瓜多糖分离纯化、质量浓度及分子质量.通过木瓜蛋白酶-Sevag法脱除蛋白,采用双氧水及透析法除去色素及小分子,利用分步醇沉法得到质量最大的CSPSⅠ,并对其进行DEAE-52柱层析,进而得到糖质量浓度最高的组分CSPSⅠC.纯度鉴定确认CSPSⅠC为高纯度多糖.对CSPSⅠC糖质量浓度、糖醛酸、硫酸基质量浓度进行测定并考察了其方法学,证实得到的结果准确可靠.采用高效液相色谱得到了CSPSⅠC的相对分子质量.通过对野西瓜多糖分离纯化及质量浓度测定为继续深入研究野西瓜多糖奠定了基础.     

巴戟天多糖的分级纯化及结构分析

对巴戟天多糖的柱层析分级纯化和一级结构进行了研究．采取热水浸提、乙醇沉淀的工艺获得巴戟天粗多糖MOHP,经离子交换和凝胶柱层析得到了MOHP-I,MOHP-Ⅱ,MOHP－Ⅲ和MOHP－Ⅳ4　个组分,通过红外光谱、液相和气相色谱等分析手段对分级后的MOHP－Ⅰ和MOHP-Ⅲ进行了初步的结构分析．结果表明：MOHP—Ⅰ的单糖组成为葡萄糖和果糖,分子质量约为2ku,呋喃糖环结构;MOHP-Ⅲ是一种均一的糖蛋白物质,其组成单糖为阿拉伯糖、木糖、葡萄糖、果糖以及半乳糖,分子质量约为35ku;高效凝胶渗透色谱显示两组分均达到了较高的纯度．     

甘薯多糖SPP-Ⅰ的制备与结构初步研究

研究采用水提醇沉法提取甘薯粗多糖,进行单因素试验考察,用正交法优化工艺.再经DEAE-纤维素-52阴离子交换柱和Sephadex G200凝胶柱对所得粗多糖进行层析纯化,得到甘薯多糖组分SPP-Ⅰ.应用苯酚硫酸法测定多糖百分含量,HPLC法测定多糖分子质量,紫外光谱、红外光谱、甲基化衍生结合GC-MS分析多糖结构.结果表明甘薯多糖最优提取工艺为提取温度90℃,提取时间3 h,液料比40∶1,提取次数3次.甘薯多糖SPP-Ⅰ总糖百分含量分别为97. 61%,分子质量为245ku,紫外光谱扫描结果显示无核酸和蛋白质吸收峰,红外光谱扫描结果表明含有多糖类物质的特征吸收峰,结合甲基化和GC-MS分析初步确定甘薯多糖SPP-Ⅰ是具有1→3、1→3→6糖苷键结构的α-葡聚糖.     

超微粉碎和普通粉碎对柳松菇多糖的提取及凝胶柱层析分离的研究

对超微粉体及三种不同大小粉体提取的柳松菇多糖及多糖的凝胶柱层析分离进行研究,结果表明,超微粉碎和普通粉碎对总糖、还原糖的提取基本没有影响,对多糖的提取影响较大．由300目超微粉提取的多糖含量和得率分别为50％和13％,未粉碎的块状、40目粗粉和100目细粉提取的多糖含量和得率分别为300目超微粉的42．8％、65．7％、72．1％和28．2％、45．7％、71．2％．采用SephadexG-200凝胶柱层析分离柳松菇多糖,得到纯化的多糖Ⅰ和Ⅱ两个多糖组分．在超微粉碎提取的柳松菇多糖中,主要是相对分子质量高的多糖Ⅰ,在未粉碎的块状提取的柳松菇多糖中,以相对分子质量低的多糖Ⅱ为主,超微粉碎有利于相对分子质量商的多糖Ⅰ的提取．多糖Ⅰ为胞内多糖,其含糖量为78％,相对分子质量约为424137,在260nm、280nm均无吸收;多糖Ⅱ的含糖量为42．9％,相对分子质量为12944,在280nm无吸收,但在260nm有一个吸收峰．     

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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