外消旋色氨酸印迹聚合物的制备及性能研究

以外消旋色氨酸(DL-Trp)为模板分子,β-环糊精(β-CD)及其衍生物为单体构建手性环境,改变印迹体系和聚合方法合成了14种印迹聚合物(MIP1~14).采用SEM和N2吸附试验表征优化印迹聚合物MIP14的结构,通过吸附动力学曲线和吸附等温线模型探讨其吸附特性,并结合HPLC分析聚合物对DL-Trp的手性拆分能力.结果表明:MIP14为孔径分布较为均一的中孔材料,主要存在两类结合位点,符合二级动力学模型.MIP14具有良好的手性拆分能力,在含有6种芳香族氨基酸的复杂体系中可特异性拆分DL-Trp,拆分因子1.477,表明以环糊精衍生物直接印迹外消旋混合物来制备手性印迹材料是一条简便而可行的合成路线.     

功能化β-环糊精包合L-苯丙氨酸印迹聚合物的制备及性能分析

文中建立了一种新型的L-苯丙氨酸(L-Phe)印迹聚合物的制备方法,采用饱和水溶液重结晶法制备功能化β-环糊精-L-苯丙氨酸包合物,通过紫外分光光度法、傅里叶红外光谱、热重-差示扫描量热分析法等检测手段对包合物进行表征.首次在包合物研究基础上加入辅助功能单体、交联剂、复合光引发剂在混合有机相中制备了L-苯丙氨酸分子印迹聚合物并且能够成功洗脱进行再吸附.结果表明,常温下每20 mg包合印迹聚合物、未包合印迹聚合物以及非印迹聚合物的饱和吸附量分别为179.3μmol/g、146.36μmol/g和64.65μmol/g.     

可溶性β-环糊精聚合物与芳香化合物包结比的研究

本文对可溶性β环糊精聚合物与客体分子的包结行为进行了探讨。结果表明，可溶性β环糊精聚合物与客体分子按同一包结比进行。而β环糊精体系在浓度较低时，包结比为１∶１；浓度较高时，包结比为１∶２。     

硫化锌荧光表面分子印迹聚合物的制备与性能研究

利用水热法合成Zn S:Mn~(2+)量子点纳米材料,并对其进行表面官能团修饰.通过原位沉淀聚合法,以马来酸酐酰化环糊精和甲基丙烯酸(Methacrylic acid,MAA)为功能单体、以桃叶珊瑚苷(aucubin,AU)为模板分子、二甲基丙烯酸乙二醇酯为交联剂、偶氮二异丁腈为引发剂制备了硫化锌表面分子印迹聚合物Zn S:Mn@MIPs,并对其性能进行了研究.结果表明,当反应温度为190℃时,Zn S:Mn~(2+)量子点的结晶质量最佳,荧光强度最强,以其为基质材料制备的表面分子印迹聚合物对桃叶珊瑚苷具有选择性识别性能.     

17β-雌二醇微球状分子印迹聚合物优化合成条件

采用分子印迹技术,建立了微球法合成17β-雌二醇分子印迹微球聚合物的方法,通过环境扫描电镜对所合成的微球的形态进行了分析研究,得到了该分子印迹聚合物最优化的合成条件．实验所获得的微球粒径均匀,平均粒径在300～400nm之间,这比已经报道的文献关于微球粒径的记载要小很多．由于该法合成的微球状的MIP粒径均匀,分散性好,性质稳定,因此更有助于结合位点对环境内分泌干扰物17β-雌二醇的结合和释放．     

β-环糊精交联聚合物的合成及其对水中污染物的絮凝作用

以环氧铝丙烷为原料合成了β-环糊精交联聚合物,研究了该聚合物对模拟水样中污染物的吸附性能。实验结果表明,β-环糊精交联聚合物对水中重金属离子和和苯酚、苯胺均具有较高的去除率。     

布洛芬手性拆分分子印迹复合膜的制备与表征

以接枝环糊精的醋酸纤维素复合物为铸膜材料,S-布洛芬为印迹分子,采用相转化法制备了用于手性分离的分子印迹膜;用FT-IR和SEM测试手段对膜的化学组成和结构形态进行了表征;通过渗透实验考察了该分子印迹膜对外消旋布洛芬的手性拆分性能。结果表明在β-环糊精接枝率为29.01%（质量分数）,模板分子浓度比为1∶10,铸膜液质量分数为12.5%的条件下,分子印迹膜对右旋布洛芬的分离因子可达2.09。     

含PAMAM改性硅胶的分子印迹聚合物的合成

利用微乳法合成了纳米硅胶,并利用聚酰胺胺(PAMAM)对其表面进行修饰以用作功能共单体、载体;以甲基丙烯酸为功能单体,甲基丙烯酸丙三醇三酯(TRIM)为交联剂,L-色氨酸为模板分子,通过微悬浮聚合的方法,合成了含有PAMAM改性硅胶的分子印迹聚合物.利用FTIR,SEM等方法对聚合产物进行了表征,并利用静态吸附和HPLC等方法研究了印迹球状的吸附分离性能.结果表明,印迹微球对水溶液中的色氨酸分子具有良好的分子识别能力,实现了对水溶液中色氨酸的识别.     

可溶性β─环糊精聚合物的合成及在气相色谱中的应用

本文研究了可溶性β─环糊精聚合物做固定相对苯、环已烷等有机化合物的分离。同时与β─环糊精和不溶性β─环糊精聚合物做固定相进行比较，结果表明该三种物质做固定相各有其分离特点。     

糊精聚合物吸附剂的制备及吸附水中双酚A的应用

本文采用一步法合成策略,将β环糊精、麦芽糊精与联苯四甲酸二酐以1∶1∶10的摩尔配比交联得到了糊精聚合物（聚合物DP）,并将聚合物DP作为一种吸附剂吸附水中的双酚A。吸附结果表明聚合物DP在较宽的pH值范围内都可以有效去除双酚A,最大吸附量达到了960 mg/g,吸附的过程属于Freundlich多分子层吸附和准二级动力学模型。6次的吸附与解吸附的重复利用实验结果表明聚合物材料可以多次反复使用,说明此聚合物作为吸附剂具有良好的应用价值。     

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