高灵敏固体基质室温燐光猝灭法测定痕量的银

以CMCNa(羧甲基纤维素钠)为前驱体,掺杂水杨基荧光酮(THBF),Pb2 为沉淀剂,用Sol-gel法合成发光分子水杨基荧光酮羧甲基纤维素铅微球(L-[(CMC)2Pb-THBF]).此微球在滤纸基质上可发射强而稳定的室温光.基于EDTA与Pb2 的络合反应,使L-[(CMC)2Pb-THBF]微球转化为水溶性组分(PbY2-、2CMC-、THBF),该组分与痕量的Ag 作用生成(CMC)2 Ag–THBF,导致S-L-[(CMC)2Pb-THBF]的固体基质室温光猝灭,据此建立了发光分子水杨基荧光酮羧甲基纤维素铅微球固体基质室温光猝灭测定痕量银的新方法.该方法用于人发、茶叶中痕量银的测定,结果满意.固体基质室温光测定银的反应机理.     

利用金属离子使发光分子固体基质室温燐光猝灭法测定痕量银

发光分子水杨基荧光酮羧甲基纤维素铅微球(L-[(CMC)2Pb-THBF]-MB)在滤纸基质上可发射强而稳定的室温光.基于EDTA与Pb2 的络合反应,使L-[(CMC)2Pb-THBF]-MB微球转化为水溶性组分(PbY2-、2CMC-、THBF),该组分与痕量的Ag 作用生成(CMC)2Ag-THBF,导致S-L-[(CMC)2Pb-THBF]-MB的固体基质室温光猝灭,建立了发光分子水杨基荧光酮羧甲基纤维素铅微球固体基质室温猝灭测定痕量银的新方法.Ag 的含量在8.0~40.0 fg/斑(20.0~100.0 pg/mL)内与ΔIp值符合比尔定律,工作曲线回归方程为ΔIp=12.56 0.5527CAg (fg/斑),r=0.999 2,检出限为2.2 fg/斑.该方法用于人发、茶叶中痕量银的测定,结果满意.     

发光分子水杨基荧光酮羧甲基纤维素铅微球固体基质室温燐光猝灭法测定痕量的钯

以NaCMC(羧甲基纤维素钠)为前驱体,掺杂水杨基荧光酮(THBF),Pb2 为沉淀剂,用Sol-gel法合成发光分子水杨基荧光酮羧甲基纤维素铅微球(简记为Pb(CMC)2–THBF).Pb(CMC)2–THBF在滤纸基质上可发射强而稳定的室温燐光(RTP).基于EDTA与Pb2 的络合反应,使Pb(CMC)2–THBF微球转化为水溶性组分(PbY2-、2CMC-、THBF),该水溶性组分与痕量上Pd2 作用生成(CMC)2 Pd–THBF,导致Pb(CMC)2–THBF上RTP猝灭,Pd2 上含量与△Ip值成线性关系,据此建立了Pb(CMC)2–THBF固体基质室温燐光猝灭燐上痕量钯上新方法.该方法上检出限为0.38fg/斑(对应浓度为9.5×10-13g/mL),工作曲线回归方程为△Ip=17.95 0.7847 C Pd2 (fg/斑),r=0.9989.本方法用于分子筛催化剂和黄矿石中痕量钯上燐上,结果满意.同时时时了固体基质室温燐光测定钯的反应机理.     

邻菲啰啉-水杨基荧光酮荧光猝灭体系测定痕量汞(Ⅱ)的研究

汞是环境监测的重要元素之一,由于环境试样中汞的含量很低,一般的分析方法难以直接测定.荧光光度法是一种用于分析化学的高灵敏度分析方法,在痕量分析领域中发展迅速,近年来,运用荧光光度法测定汞的研究报道不多[1～3].而水杨基荧光酮作为荧光试剂测定痕量汞尚未见报道.本文基于汞与水杨基荧光酮和邻菲啰啉生成三元配合物后,对水杨基荧光酮的荧光猝灭作用,建立了测定痕量汞的荧光分析新方法.实验表明,该方法具有较好的选择性和较高的灵敏度,用于环境水样中痕量汞的测定,效果良好.     

固体基质室温磷光猝灭法测定尿结石和人发中微量铋

报道了包含桑色素(Morin)的SiO2纳米微球(Morin-SiO2)的合成方法,并用JEM-2000EX型透射电子显微镜检测其微球粒径,达到50 nm.基于Morin-SiO2能在滤纸固体基质上发射强而稳定的室温磷光,铋可使室温磷光猝灭,据此建立了Morin-SiO2固体基质室温磷光猝灭法测定痕量铋的新方法.铋的含量在0.16～14.4 ag/斑(浓度范围0.40～36.0 fg/ML,0.4 μL/斑)内与△Ip值成线性关系,方法检出限0.026 ag/斑(对应浓度6.5×10-17 g/mL),本法灵敏度高,重现性好,简捷快速,用于尿结石、人发样品的测定,结果满意.     

2-苯胺基-3-氨乙基喹唑啉-4（3H）-酮（Q）与牛血清白蛋白的相互作用

应用荧光光谱研究了2-苯胺基-3-氨乙基喹唑啉-4（3H）-酮（Q）与牛血清白蛋白（BSA）间的结合作用．确定了2-苯胺基-3-氨乙基喹唑啉-4（3H）-酮（Q）对牛血清白蛋白的荧光猝灭过程的猝灭机理,测定了不同温度下该结合反应的结合常数,结合位点数及热力学参数．     

金属离子对一种ICT荧光探针与人血清白蛋白作用的影响

采用荧光光谱法研究了Cu2＋对1-酮-2-（对二甲氨基苯亚甲基）-四氢萘（KDTN）与人血清白蛋白（HSA）相互作用的影响.结果表明,Cu2＋的存在对KDTN与HSA的猝灭类型及分子之间作用力没有影响,使KDTN对HSA的猝灭效应增强;荧光猝灭双倒数曲线表明,Cu2＋的存在使KDTN与HSA的结合常数发生明显变化,结合位点仍接近1.     

高氯酸镝、高氯酸铕在二苯亚砜体系中的共发光

合成了高氯酸镝铕（Ⅲ）二苯亚砜Ｄｙ１－ｘＥｕｘ（ＤＰＳＯ）η（ＤＰＳＯ）η（ＣｌＯ４）３（ｘ＝１．０００￣０．０００）一系列固体配合物,测定了配合物的组成及荧光激发和发射光谱、发现镝（Ⅲ）和铕（Ⅲ）的姚有猝灭作用,铕（Ⅲ）对镝（Ⅲ）的发光也有猝灭作用,同时研究了Ｄｙ＾３＋、Ｅｕ＾３＋相互猝灭的浓度范围,并根据实验结果了配体Ｓ１能级以及Ｄｙ＾３＋的有关能级     

铜离子与牛血清白蛋白相互作用的研究

运用荧光光谱法研究了铜离子（Cu^2＋）与牛血清白蛋白（BSA）的作用机制.实验表明：Cu^2＋对BSA具有荧光猝灭作用,其猝灭方式为静态猝灭,并求出了猝灭常数、结合常数及结合位点数.     

铝（Ⅲ）—5′—硝基水杨基荧光酮—溴化十六烷基三甲铵体系的荧光反应及应用研究

基于铝（Ⅲ）5′－硝基水杨基荧光酮的荧光具有猝灭的特性，拟定了一种测定铝的新方法。该方法的激发波长为246nm，发射波长为552nm，线性范围为1.6-28ng/ml，检出限为1.6ng/ml。本方法灵敏度高、选择性好，用于多种茶叶中微量铝的测定，获得了满意的结果。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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