库拉索芦荟和木立芦荟叶的形态结构及有效成分含量的比较

应用植物解剖学和植物化学相结合的方法比较研究了3年生库拉索芦荟(Aloe vera L.)和木立芦荟(Aloe arborescens Mill)的形态结构和芦荟素、芦荟多糖等有效成分的含量.研究结果表明:(1)库拉索芦荟茎极短,叶丛生,成熟叶片长60~80 cm,质量400~550 g;木立芦荟茎高50~70 cm,叶互生,成熟叶片长40~50 cm,质量100~150 g.(2)两种芦荟叶都由表皮、同化组织、贮水组织和维管束组成.库拉索芦荟叶的贮水组织占横切面的90%以上,而木立芦荟叶的贮水组织仅占横切面的70%.(3)库拉索芦荟叶中芦荟素含量为1.46%,芦荟多糖含量为3.56%,宜作为芦荟多糖的原料;木立芦荟叶中芦荟素含量为2.15%,芦荟多糖含量为2.58%,宜作为芦荟素等蒽醌类物质的原料.研究结果为芦荟的引种栽培、采收和产品加工提供了科学依据.     

甘草多糖的化学与药理研究

综述了甘草多糖的提取方法、化学组分、药理作用等方面的研究进展.现代提取方法较传统方法简便快捷,甘草多糖产量高,且不会影响多糖的结构和活性.研究表明,甘草多糖主要由鼠李糖、葡聚糖、阿拉伯糖和半乳糖组成,但其主链结构的研究结论不尽相同.药理研究发现,甘草多糖具有免疫调节、抗肿瘤、抗病毒等作用,而且无细胞毒作用.     

灵芝多糖的研究概况

灵芝属真菌具有很高的药用价值从而得到广泛的研究与应用,而多糖类化合物是灵芝属真菌的主要化学成分之一,因此对多糖类化合物的深入研究将有利于进一步研究灵芝属真菌的药理活性及其应用.综述了国内外近年来对灵芝多糖的化学结构、多糖的组成、部分多糖的分子量、药理作用及其结构与药理之间的关系等研究的近况,拟对其灵芝资源的深入开发起到促进作用.     

北虫草多糖提取及其抗氧化、抗衰老作用研究进展

北虫草是中国的传统医药,常以干燥的子实体入药,是药用价值较高的虫草菌属之一,具有药理性强、药效范围广的优点.北虫草多糖作为其主要的活性成分,具有抗氧化、抗衰老、抗肿瘤、抗炎、免疫调节等多种药理作用.为提高北虫草多糖的提取率,研究多糖的药理作用,对北虫草多糖的提取工艺及其抗氧化、抗衰老作用的相关研究进行综述.     

芦荟多糖对荷瘤小鼠肿瘤细胞膜功能的影响

研究芦荟多糖对荷瘤小鼠肿瘤细胞膜功能的影响.采用荧光分光光度法、SDS-聚丙烯酰胺凝胶电泳以及唾液酸试剂盒分别测定库拉索和木立2种芦荟多糖对S180小鼠肿瘤细胞膜脂流动性、膜蛋白及唾液酸含量的影响.结果表明,2种芦荟多糖各剂量组均能不同程度地降低S180小鼠肿瘤细胞膜脂流动性、膜交联蛋白百分比含量和唾液酸的含量,且两种多糖中、高剂量组具有显著性(P<0 05或P<0 01).提示,芦荟多糖对S180小鼠肿瘤细胞膜功能具有抑制作用,提示其可能为芦荟多糖发挥抗肿瘤作用的主要机制之一.     

芦荟多糖对S180小鼠免疫调节因子活性的影响

研究库拉索芦荟多糖对S180小鼠红细胞免疫调节因子活性的影响．采用郭峰法测定．库拉索芦荟多糖可显著提高S180小鼠红细胞G3b受体花环促进率,降低其抑制率,因而从红细胞免疫角度,来揭示芦荟多糖具有抗肿瘤及提高机体免疫的功能．     

芦荟中多糖含量的测定

芦荟是一种含有较为丰富的营养物质的天然植物,其生物活性成份复杂多样,主要含有多糖、氨基酸、有机酸、维生素等多种营养成分近年来,人们发现多糖具有抗感染、抗癌、增强免疫力及保健、美容、药用等功效[1,2],因此芦荟多糖的研究也是近年研究热点之一,在多糖的分离、纯化、组分测定和结构分析等技术上取得进展[3,4].本文报道用分光光度法测定芦荟中多糖含量的方法.     

芦荟多糖的保健功能研究进展

芦荟是百合科芦荟属肉质草本植物，在全世界范围内，大约有360多种的不同品种的芦荟分布在北美、亚洲、欧洲和非洲的干旱地区，本文综述了芦荟多糖的免疫调节、抗肿瘤、保肝护肝、抗辐射、抗溃疡、抗氧化、抗衰老和降血糖等多种保健功能及相关研究进展。     

植物多糖研究进展

多糖是一类重要的生物活性物质和低毒物质,所以研制与开发十分活跃.多糖除了作为免疫调节剂增强免疫功能外,还具有抗肿瘤、抗病毒、抗突变、抗衰老、抗凝血、降血糖和环境治理等生物学效应.但由于其结构复杂,质量标准不易控制,研究手段局限,国内外科研工作者也仅对分离纯化、化学组成、生物活性、构效关系等关系方面做了有限的研究.     

三峡库区美国库拉索芦荟中芦荟苷和芦荟多糖含量测定

文章在分析三峡库区美国库拉索芦荟中芦荟苷和芦荟多糖含量的基础上,采用高效液相色谱和紫外分光光度法分别测定芦荟中芦荟苷、芦荟多糖、乙酰化多糖的含量,通过对三峡库区种植美国库拉索芦荟与云南元江相比,指出芦荟中芦荟苷、芦荟多糖和乙酰化多糖的含量并无差异,三峡库区适宜种植美国库拉索芦荟.     

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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