5种药用芦荟中芦荟甙含量的测定

对库拉索芦荟、木立芦荟、好望角芦荟、中华芦荟和皂质芦荟5种药用芦荟中芦荟甙的含量进行了定量的测定,发现全叶干粉中芦荟甙含量差异显著,含量高低依次为：库拉索芦荟、木立芦荟、好望角芦荟、中华芦荟、皂质芦荟;而以鲜质量计算芦荟甙含量,发现库拉索芦荟、木立芦荟和好望角芦荟中芦荟甙含量接近,并大大高于中华芦荟和皂质芦荟中芦荟甙的含量。     

关于芦荟化学组成的探讨

本文提出了制取芦荟各类原汁的方法,并初步证实了芦荟大黄素类、芦荟苦素类和芦荟宁的存在及分布趋势。从而指出:凝胶原汁应用于日化产品将是最主要的开发方向之一。     

库拉索芦荟大黄素提取分离的研究

比较了GD-3、GD-4和GD-10三种吸附树脂对芦荟提取物的分离效果，确定了以GD-10大孔吸附树脂为固定相，梯度浓度乙醇溶液为流动相的低压柱色谱分离模式．通过实验确定分离条件为上样速度为2．0mL／min，上样浓度为5．0g／L，制备型色谱的洗脱速度为20mL／min，分析型色谱洗脱速度为＜1．OmL／min，优选了以60％乙醇溶液为溶剂超声波多次提取法，利用上述分离条件，将分离出的芦荟大黄素，UV-V、IR、^1HNMR和MS对其进行了表征。     

中华芦荟特性与组织培养技术

通过以中华芦荟萌蘖芽或无木质化茎段为外植体进行愈伤组织和不定芽诱导，进行组培增殖，生根培养和试管苗移栽，实验中华芦荟的快速繁殖和规模生产。     

纳米硅防治三峡库拉索芦荟褐斑病的药效试验

以三峡库区库拉索芦荟褐斑病为研究对象，在实验室内选用6种药剂对其病原菌进行药效实验和大田试验，结果表明：效果最明显的为瑞毒霉，其次为纳米氧化硅．同时，纳米硅以其无公害有营养的优势为芦荟无公害生产提供了可行性．     

植物材料作为芦荟凝胶稳定剂的研究

采用4种常用植物材料DGC、SGR、CTA、SL对芦荟凝胶进行稳定化处理，并通过正交实验确定了4种植物的最佳质量分数分别为：DGC 0.2％，SGR 0.1％，CTA0.05％，SL0.2％。结果表明，凝胶经4种植物稳定处理后在30℃下可保存65d．常温下可存放7个月不变质。这4种植物对芦荟凝胶具有显的协同保鲜作用，是具有开发前景的天然防腐抗氧化柯料。     

芦荟对小鼠胃粘膜的保护作用

通过建立芦荟提取液小鼠的力竭游泳训练实验模型，测定了小鼠胃粘膜中超氧化物歧化酶（SOD）的活性、丙二醛（MDA）的水平。结果表明：灌服芦荟提取液后，小鼠游泳运动力明显提高，胃粘膜中SOD活性显高于各自对照组，MDA含量显低于各自对照组，说明芦荟具有一定的抗自由基损伤和抗脂质过氧化损伤的作用，对胃粘膜具有一定的保护作用。     

芦荟泡制酒对小鼠血中铁、锌、铜含量的影响

目的探讨芦荟泡制酒对小鼠血中铁、锌、铜含量的影响,为研究芦荟的药理作用及开发芦荟的药物及保健功能提供科学依据.方法将40只健康雄性小鼠随机分为对照组和高、中、低三个芦荟泡制酒剂量组,连续灌胃21 d,断头、取血,用WYX-402B火焰原子吸收分光光度计测小鼠血中铁、辞、铜的含量.结果实验各组铁、锌、铜含量均高于对照组(P<0.05).结论芦荟泡制酒可以增加小鼠血中铁、锌、铜等微量元素的含量.     

芦荟凝集素提取及促免疫活性功能初步研究

分别从3种有经济价值的芦荟品种,即中华芦荟（Aloe vera .ver.chinensis(Haw））,库拉索芦荟（Aloe barbadensis Mill)和木立芦荟（Aloe arborescens Mill)中采用凝胶层析法提取了3种凝集素,Lecl,Lec2和Lec3,经过聚丙烯酰胺凝胶电泳分析其为单一成分的糖蛋白,比较了3种凝集素的糖和蛋白的含量,得出库拉索芦荟凝集素Lec2糖含量最高,木立芦荟凝集素Lec3蛋白含量最高,免疫学实验证明,库拉索芦荟凝集素的凝集效价最高,其次为木立芦荟,中华芦荟,3种凝集素对淋巴细胞转化功能都有明显的促进作用,其中库拉索芦荟凝集素Lec2的促淋巴细胞转化率最高,因此芦荟凝集素在治疗免疫功能低下方面可能有一定的应用价值。     

天然芦荟复合饮料的开发研究

本研究以翠叶芦荟（Alone barbadensis)、乌龙茶、蜂蜜为主要原料，采用β-CD包络芦荟汁中活性物质的技术方法，通过正交试验优选最佳工艺配方和适宜的复合稳定剂，首次成功研制了一种风味独特，口感良好的芦荟茶天然复合保健饮料。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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