番茄红素改善D-半乳糖致衰老大鼠抗氧化功能的研究

用D-半乳糖注射Wistar雄性大鼠5个月,建立衰老模型.对青年对照组、正常老龄对照组、模型组、高/中/低不同剂量番茄红素组血清MDA含量、肝脏匀浆MDA含量和血液SOD、GSH-Px酶活性进行测定及比较.实验结果表明青年对照组和番茄红素组血清MDA含量和肝脏匀浆MDA含量均比模型组有显著降低（P＜0.01）,而血液SOD、GSH-Px酶活性比模型组有显著升高（P＜O.01）.因此摄入适量番茄红素可以有效地增强大鼠机体抗氧化能力,从而延缓D-半乳糖诱发的大鼠衰老.     

番茄红素对D-半乳糖致老大鼠骨质影响研究

本文研究了番茄红素对D-半乳糖致老大鼠骨质的影响.主要采用的方法是用D-半乳糖注射Wister雄性大鼠5个月,建立衰老模型,对青年组、模型组、药物组和正常老龄对照组进行骨常规参数进行测定及比较.实验结果表明:D-半乳糖组骨密度、骨结构力学参数、生物力学参数、骨钙、镁、锰及羟脯氨酸含量均比青年组有显著降低(P<0.01),而骨磷含量,骨和血清碱性磷酸转移酶均比青年组有显著升高(P<0.01),这些变化与正常老龄对照组的变化趋势一致,并且比后者变化得更显著.相比之下,药物组在上述参数指标均比模型组呈现显著差异(P<0.01).故长期大量摄入D-半乳糖导致大鼠衰老同时可能诱发其发生骨质变化,而番茄红素可以预防或降低此类致老骨质变化的发生.     

口服D-半乳糖致动物衰老效应的评价

目的评价口服D-半乳糖(D-galactose)的致衰老效应。方法实验选用NIH小鼠和Wistar大鼠,每日口服700mg/kg和皮下注射70 mg/kg D-半乳糖制备成衰老模型,Morris水迷宫(Morris-maze)检测动物学习记忆能力,生化方法测定小鼠脑MAO-B(Monoamine oxidase B)活性,肝脏SOD(Superoxide dismutase)和MDA(Malondialdehyde),含量、心肌脂褐素含量。结果口服D-半乳糖不影响小鼠体重增长,与对照组比较,无显著差异(P>0.05),而皮下注射D-半乳糖可使体重增长缓慢,与对照组和口服组比较差异极显著。口服D-半乳糖可降低小鼠和大鼠的学习记忆能力,使Morris迷宫作业时间(动物在水迷宫中由入水点至安全岛所用的时间,简称作业时间)延长,阿尼西坦可对抗D-半乳糖诱导的大鼠脑老化学习记忆减退的效应(P<0.01)。生化测定结果表明,口服D-半乳糖升高小鼠脑MAO-B活性和肝脏MDA含量、降低肝脏SOD活性、升高心肌脂褐素含量,与对照组比较,差异极显著(P<0.01),口服组与皮下注射组比较无显著差别(P>0.05)。结论小鼠和大鼠口服D-半乳糖能产生拟衰老效应,与皮下注射D-半乳糖诱导的衰老效应基本相似。     

黄芪注射液对D-半乳糖所致衰老小鼠的免疫、衰老和血脂指标的影响

目的探讨黄芪注射液对D-半乳糖致衰老小鼠抗衰老作用。方法皮下注射D-氨基半乳糖制作衰老鼠模型,同时每日对不同组小鼠分别腹腔给予相应药物,8周后处死小鼠,观测小鼠血液中丙二醛（MDA）、超氧化物歧化酶（SOD）、总胆固醇（TC）、甘油三酯（TG）,并测定肝脏、脾脏与胸腺的系数。结果与模型组相比,模型＋黄芪组血清中SOD明显升高,MDA、TC和TG含量降低。结论黄芪注射液能提高机体抗氧化酶活性,增加免疫器官质量,有较好的抗衰老作用。     

决明子抗衰老实验研究

目的:研究决明子对D-半乳糖所致衰老模型大鼠的抗衰老作用。方法:选用长期皮下注射D-半乳糖形成的衰老小鼠模型。结果:与模型组相比,决明子组SOD活性增高,MDA含量则显著下降,胸腺系数和脾脏系数提高,差异均具有显著性(P<0.05)。结论:决明子具有抗衰老作用。     

虾青素对衰老大鼠肾脏自由基的影响

研究虾青素对衰老大鼠肾脏自由基代谢的影响。采用D-半乳糖腹部皮下注射建立衰老模型,对衰老大鼠进行6周的虾青素营养干预,24只SFP级SD大鼠经适应性喂养后分为3组:对照组、衰老组、虾青素+衰老组,每组8只。实验周期42d,衰老组,虾青素+衰老组腹腔注射100mg/kg剂量的D-半乳糖,对照组注射生理盐水。虾青素干预组灌胃20mg/kg的虾青素,其他组灌胃等量蒸馏水。实验结束后即刻取材,测试各组大鼠肾组织内SOD、γ-GCS活性及MDA含量的影响。结果显示,SOD、γ-GCS的活性,衰老组较安静组显著降低(P0.01);虾青素干预组较衰老组显著升高(P0.01);MDA含量,衰老组较安静组显著升高(P0.01);虾青素干预组较衰老组显著降低(P0.01)。由此得出结论,虾青素对D-半乳糖致衰大鼠肾脏自由基代谢水平具有较好的改善作用。     

TBWDS水煎剂对亚急性衰老模型小鼠血清SOD、MDA和T-AOC的影响

目的：研究滋补健身方剂塔本文都苏（TBWDS）水煎剂对D-半乳糖诱导的亚急性衰老模型小鼠血清抗氧化指标的影响.方法：40只小鼠随机分为正常对照组、模型组、TBWDS高、低剂量组,用D-半乳糖连续皮下注射复制衰老小鼠模型,连续灌胃60天.结果：TBWDS水煎剂能显著降低D-半乳糖致亚急性衰老模型小鼠血清的丙二醛（MDA）含量（ P〈0.01）,能明显升高血清中超氧化物歧化酶（SOD）活性和提高血清总抗氧化能力（T-AOC）（P〈0.05,P〈0.01）.结论：TBWDS水煎剂可通过抗氧化作用从而延缓衰老.     

肾气丸对衰老大鼠心肌、肝脏细胞凋亡及线粒体膜电位的影响

目的：观察肾气丸对D-半乳糖（D-gal）致衰老模型大鼠心肌、肝脏细胞凋亡及线粒体膜电位的影响.方法：Wistar大鼠随机分为4组,每组10只：正常组,模型组,肾气丸低、高剂量组.制备D-gal大鼠衰老模型,采用流式细胞技术观察心肌、肝脏细胞凋亡及线粒体膜电位变化,ELISA法测定心肌、肝脏组织超氧化物歧化酶（Superoxide Dismutase,SOD）、丙二醛（Malomdialdehvde,MDA）含量变化.结果：与模型组比较,肾气丸组大鼠心肌、肝脏细胞凋亡率明显下降（P ＜0.05或P＜0.01）,线粒体膜电位明显升高（P＜0.05或P＜0.01）;心肌、肝脏组织SOD含量均明显升高（P＜0.05或P＜0.01）,MDA含量明显下降（P＜0.05或P＜0.01）.结论：肾气丸可阻断衰老大鼠心肌、肝脏细胞线粒体膜电位的下降,抑制细胞凋亡,其作用机理与肾气丸提高心肌、肝脏组织抗氧化功能有关.     

葛根素对运动大鼠血清自由基代谢及运动能力的影响

通过建立竭力游泳训练模型,测试大鼠血清SOD、GSH-Px、GSH、T-AOC、MDA含量,探讨葛根素对运动训练大鼠血清自由基代谢及运动能力的影响.研究结果表明,安静时葛根素组大鼠血清SOD、T-AOC高于对照组,而MDA含量低于对照组(P<0.05);运动后即刻和恢复24 h葛根素组大鼠血清SOD、GSH-Px活性、T-AOC显著高于相应对照组(P<0.05),而MDA含量明显低于相应对照组(P<0.05);且葛根素组游泳时间较对照组有显著延长(P<0.05).葛根素可显著提高运动大鼠抗自由基氧化的功能,使小鼠运动能力有了明显提高.     

绞股蓝、山楂提取物对D-半乳糖诱导的衰老模型小鼠抗氧化作用的实验研究

目的 研究绞股蓝、山楂提取物的协同抗氧化活性,探讨抗衰老作用机制.方法 小鼠颈背部皮下注射D-半乳糖建立衰老模型,灌胃给予不同剂量的绞股蓝、山楂提取物,检测小鼠血液和肝脏组织中的丙二醛(MDA)含量以及超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Pa)的活力.结果 绞股蓝、山楂提取物协同能显著降低衰老模型小鼠血清和肝组织MDA水平,同时可提高GSH-PX活力水平.结论 绞股蓝、山楂提取物协同具有显著的抗氧化作用,对衰老的自由基学说提供有力的支持.     

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