Meso-[四(对-三甲铵基)苯基]卟啉在核酸分子表面长距组装的荧光特性及分析应用

在低离子强度下，ｍｅｓｏ［四（对三甲铵基）苯基］卟啉（ＴＡＰＰ）能在核酸分子表面进行长距组装并诱导核酸超螺旋结构的形成．长距组装使得ＴＡＰＰ的Ｓｏｒｅｔ带发生减色效应，并使Ｓｏｒｅｔ带处激发产生的荧光被猝灭．体系离子强度（Ｉ）增大将降低ＴＡＰＰ长距组装的能力，导致荧光猝灭程度降低．在Ｉ＝０００４时，荧光猝灭程度与核酸的浓度成线性关系，可用于１５×１０－６～９０×１０－６ｍｏｌ／Ｌ的小牛胸腺ＤＮＡ，１５×１０－６～１０５×１０－６ｍｏｌ／Ｌ鱼精子ＤＮＡ和酵母ＲＮＡ的测定．     

镝—镧—邻氟苯甲酸—乙二胺体系荧光增敏效应

研究发现镝与邻氟苯甲酸（ｏ－ＦＢＡ）有较强的荧光反应，并观察到镧存在下的共发光现象．研究了该反应的荧光特点和影响因素，确定了反应和测定的最佳条件．镧的加入使原有的镝—邻氟苯甲酸—乙二胺体系的荧光强度增大了８５倍．在最佳条件下，浓度在５．０×１０－６～５．０×１０－５ｍｏｌ·Ｌ－１范围内与荧光强度成线性关系，检测限为１．０×１０－６ｍｏｌ·Ｌ－１．采用多点增量标准加入法测定了合成稀土样品中镝的含量．     

表面活性剂增敏四环素碱性降解荧光法研究

提出了表面活性剂增敏的碱性降解荧光法测定四环索新方法，四环素在０．５ｍｏｌ／ＬＮａＯＨ溶液中反应，生成强荧光降解物，加入十六烷基三甲基溴化铵后。四环素荧光强度增强１５０倍，浓度在９．０×１０￣（－９）～１．０×１０￣（－６）ｍｏｌ／Ｌ范围内荧光强度与四环素含量成正比。本法成功地用于尿液和血清中四环素的回收测定。     

钼－桑色素配合物的极谱波研究与应用

在ｐＨ２．１的硫酸－２．９６×１０－６ｍｏｌ／Ｌ桑色素－０．１７２ｍｏｌ／Ｌ氯酸钾底液中，钼在－０．４３Ｖ（ＳＣＥ）有一灵敏的极谱催化波，可用于测定微量钼．线性范围１．０４×１０－９～２．５０×１０－８ｍｏｌ／Ｌ，检出限１．８８×１０－１０ｍｏｌ／Ｌ．　极谱催化波法直接应用于三氧化钨光谱标样中微量相的测定，方法简便，准确可靠。     

用气敏电极法测定焦化厂废水中氨

研究了用气敏电极测定焦化厂废水中氨的分析方法，对测定的线性范围、响应时间、回收率、干扰物质等作了理论探讨和大量试验。在ｐＨ为１１．５～１４．０时，线性范围为１．００×１０－５ｍｏｌ／Ｌ～１．００×１０－１ｍｏｌ／Ｌ，最低检出限为５．０×１０－６ｍｏｌ／Ｌ，ＲＳＤ不大于２．５％。     

镝－钆－BPMPHD—CTMAB共发光体系的研究及其分析应用

镝－ＢＰＭＰＨＤ—ＣＴＭＡＢ离子缔合物体系具有较强的荧光强度．在该体系中，Ｇｄ３＋、Ｙ３＋、Ｌｕ３＋和Ｌａ３＋等稀土离子均能使镝的荧光增强，这是新发现的一种共发光体系．本文详细研究了镝－钆－ＢＰＭＰＨＤ－ＣＴＭＡＢ体系共发光效应的形成条件和影响因素．实验表明，在最佳测试条件下，镝在１．０×１０－７～６．０×１０－６ｍｏｌ／Ｌ范围内与其荧光强度呈线性关系，检出限为２．０×１０－８ｍｏｌ／Ｌ，它比无Ｇｄ３＋存在时体系的检出限降低了一个数量级．应用该体系测定稀土氧化物及稀土合成样品中痕量镝，结果较为满意．     

新试剂6-(2-羟基-4-二乙基氨苯偶氮)-2,3-二氢-1.4-酞嗪二酮的电化学发光研究

应用自制的ＥＣＬ－１型电致化学发光仪，对新试剂６－（２－羟基－４－二乙基氨苯偶氮）－２．３－二氢－１，４－酞嗪二酮（ＨＤＥＡ）在Ｎａ２ＣＯ３－ＮａＨＣＯ３缓冲介质中的电化学发光行为作了研究．结果发现，当介质ｐＨ值为 １０．５４时，在一定的实验条件下，施加 １．７Ｖ （ＶＳ．ＳＣＥ）三角波脉冲电压，体系的发光强度与ＨＤＥＡ浓度在５．０ × １０－９～１．０×１０－６ｍｏｌ／Ｌ范围内呈线性关系，反应的检测限达１．０×１０－９ｍｏｌ／Ｌ．     

离子敏感微电极的制作及参数测试

本文制作了Ｋ＋，Ｎａ＋液态膜离子敏感微电极（Ｋ＋，Ｎａ＋—ＩＳＭＥ），并稳定了其制作条件，经测试，Ｋ＋—ＩＳＭＥ线性范围为１—１０－４ｍｏｌ／Ｌ，检测下限为３．０×１０－６ｍｏｌ／Ｌ。对Ｎａ＋选择系数为２．６８×１０－４。电位飘移为±０．１ｍＶ／ｈ。Ｎａ＋—ＩＳＭＥ线性范围为１—２．０×１０－ｍｏｌ／Ｌ，检测下限为５．０×１．０－４ｍｏｌ／Ｌ。对Ｋ＋的选择系数为１．８５×１０－２，对Ｃａ２＋的选择系数为１．４６。上述参数均满足生理实验要求，离子敏感微电极技术可做为生理学研究的重要手段。     

半胱氨酸与镉（Ⅱ）的配合物极谱波研究

在０．２ｍｏｌ／ＬＢｒｉｔｏｎ－Ｒｏｂｉｎｓｏｎ（ＢＲ）缓冲体系中（ＰＨ＝８．０）,半胱氨酸与镉（Ⅱ）形成的配合物在－０．６２ｖ（ｖｓＳＣＥ）可产生灵敏的阴极化波,其二阶导数波高与镉（Ⅱ）浓度在４．０×１０－８～１．０×１０－６ｍｏｌ／Ｌ范围内成线性关系,检出限为１．０×１０－８ｍｏｌ／Ｌ。研究了配合物波的性质,建立了测定镉（Ⅱ）的新方法,可用于烟草中镉的测定。     

菸草,烟气中菸碱的示波极谱法快速测定

拟定了快速测定菸草、烟气中菸碱的单扫描示波极谱方法。在０．１ｍｏｌ／ＬＮＨ_４ＣｌＨＣｌ（ｐＨ２．６±０．３）支持电解质中，菸碱还原波峰电位Ｅ_ｐ为－１．２３Ｖ，一阶导数峰峰高与其浓度在４×１０~（－７）～１×１０~（－５）ｍｏｌ／Ｌ范围内有线性关系。１．８倍菸酸、０．６倍菸酰胺不干扰８×１０~（－６）ｍｏｌ／Ｌ菸碱的测定。应用本方法不经预先分离，直接快速测定菸草水浸提液、烟气中菸碱含量，结果令人满意。     

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