芦荟甙—硼砂荧光体系及芦荟甙的测定

采用薄层分离和荧光光度法对芦荟中芦荟甙的含量进行了测定，在硼砂介质中，芦荟甙与硼砂发生化学反应，使体系荧光强度提高了10倍．方法的检测限为2．0×10－9mol·L－1．灵敏度高，重现性好．用标准加入法测定2种样品，回收率在92．9％-104．0％之间．     

芦荟对多刺裸腹蚤的生物学效应：———一种抗衰老药和的？…

以多刺裸腹蚤为动物筛选模型，从药效学方面研究了芦荟提取液对多刺裸腹蚤的生命活力和寿命的影响。试验结果表明：１％浓度的芦荟提取液多刺裸腹蚤的体长增加至１．６２ｍｍ，产仔时间提前了４４．４％，繁殖代数的１１代，平均寿命延长了１９．８４％。充分显示芦荟提取液对多刺裸腹蚤的生长发育、繁殖和寿命方面，都有较为明显的促进作用。     

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。     

搅拌型芦荟果粒酸奶稳定性的研究

实验结果表明：在能够打碎酸凝乳条件下，以慢速短时间搅拌效果较好；添加8～10％的芦荟果粒，3‰的变性淀粉，产品均匀细腻，质量稳定。     

芦荟三黄烧伤膏配方的研究

采用现代配方,在传统三黄膏中配入芦荟,通过正交试验对芦荟三黄烧伤膏的稳定性进行研究,运用多种乳化剂的配合使用,制成最优配方为硬脂酸1％,白油10％,单甘酯2％,K120％的稳定乳剂。同时对该产品的抑菌性能与传统抗生素作了比较,效果相当。     

芦荟对多刺裸腹蚤的生物学效应——一种抗衰老药物的筛选试验

以多刺裸腹蚤为动物筛选模型,从药效学方面研究了芦荟提取液对多剌裸腹蚤的生命活力和寿命的影响。试验结果表明：１％浓度的芦荟提取液使多刺裸腹蚤的体长增加至１．６２ｍｍ,产仔时间提前了４４．４％,繁殖代数为１１代,平均寿命延长了１９．８４％。充分显示出芦荟提取液对多刺裸腹蚤的生长发育、繁殖和寿命方面,都有较为明显的促进作用。     

芦荟甙的伏安行为及其应用研究

芦荟甙在０．０５ｍｏｌ·Ｌ＾－１硫酸溶液中出现一灵敏的吸附伏安峰,峰电位为０．２３Ｖ（ｖｓ．Ａｇ／Ｃｌ）。峰电流与芦荟甙的浓度在２．０×１０＾－８～４．０×１０＾－７ｍｏｌ·Ｌ＾－１和４．０×１０＾－７～６．０×１０＾－６ｍｏｌ·Ｌ＾－１范围内成线性关系,检出限为５．０×１０＾－９ｍｏｌ·Ｌ＾－１（富集时间为１５０ｓ）。用线性扫描和循环估安法研究了体系的电化学行为,并应用于芦荟原胶中芦荟甙的的测定     

芦荟中钙和镁含量的检测

在萘酚绿B-KOH和铬黑T-乙二胺-KOH底液中，用线性扫描极谱法做电流,电压曲线，测定芦荟中的钙和镁。钙和镁分别在-0．602和-0．966V左右的峰形较好。在相应的底液中，根据介质浓度、酸度及干扰离子对测定结果的影响，确定了各种因素的合理操作范围。此法测定钙和镁的线性范围，分别为5—500mg／L和1—40mg／L，其回收率分别为99．10％和99．92％。     

古巴芦荟的组织培养

试验结果表明：古巴芦荟（ＡｌｏｅｖｅｒａＬ．）对蔗糖浓度适应范围较大（２％～５％），其中以３％的浓度最适宜．在侧芽诱导中以ＭＳ基本培养基较合适．激素对侧芽的诱导作用符合细胞分裂素／生长素的器官发生调节模式，其中以ＭＳ＋ＢＡ３—５ｍｇ／Ｌ＋ＮＡＡ０．２ｍｇ／Ｌ对芽的诱导最有效，而ＫＣ＋ＩＢＡ２—３ｍｇ／Ｌ对根的诱导最佳，生根率达１００％．在生根培养阶段加入１－３ｍｇ／Ｌ的活性碳是必要的．试管苗移栽的最佳基质是河沙，成活率达９０．２％．     

地膜棉花铃期的田间管理

据近几年调查，大部分地膜棉田花铃期蕾铃脱落剧增，平均达74．2％～85．3％，其中1～3果枝脱落率为68．3％～74．2％，4～6果枝为71．1％～84．4％，7～9果枝为83．1％～97．4％。除1～2圆锥体靠主茎能保住伏前桃外，其它园锥体及外围铃均易脱落，特别是7月10日～7月30日开花结的铃脱     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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