Acquisition of an Argon Laser for Phase Fluorometry

氩激光将用于肌酸激酶、级联聚合物、硝酸还原酶的荧光衰减研究和静态猝灭极限的研究。提出了肌酸激酶折叠和构象的内源性和外源性荧光寿命和各向异性研究。提出了一套全面的平衡和动力学实验，包括猝灭研究，以描述折叠途径中的中间体以及折叠与亚基结合之间的时间关系。实验将评估级联聚合物的内部环境与合成胶束的关系，使用亲脂探针寿命和各向异性。利用表征良好的胶束动力学探针——二苯基己三烯，提出了评价内畴溶剂特性和填充程度的实验。研究了硝酸还原酶的催化性能与二聚体、四聚体和分离结构域的构象之间的关系。实验提出，以检查组装的四聚体状态，使用本征荧光和巯基标记的蛋白质作为构象变化的报告存在的效应活性。寿命测量将用于计算四氯化碳对苝和9,10二氰炭素的猝灭常数，并用于计算静态猝灭极限。氩激光是一种高强度的激发源，用于检测本征荧光寿命和本征荧光团各向异性。多重激发波长将有助于用离散和分布模型对超确定数据集进行全局分析，以表征衰减规律。

An argon laser will be used in fluorescence decay studies of creatine kinase, cascade polymers, nitrate reductase and an investigation of the static quenching limit. Intrinsic and extrinsic fluorescence lifetime and anisotropy investigations of creatine kinase folding and conformation are proposed. A comprehensive set of equilibrium and kinetic experiments, including quenching studies are proposed to describe intermediates in the folding pathway and the temporal relationship between folding and association of subunits. Experiments will assess the internal environment of cascade polymers in relation to synthetic micelles, using lipophilic probe lifetimes and anisotropies. Experiments are proposed to evaluate the solvent characteristics of the internal domain and the degree of packing using diphenylhexatriene, a well- characterized probe of micelle dynamics. A study is presented to characterize the relationship between catalytic properties and the conformations of the dimer, tetramer and isolated domains of nitrate reductase. Experiments are proposed to examine the assembly of the tetrameric state, using the intrinsic fluorescence and thiol-labelled protein as reporters of conformational changes in the presence of effectors of activity. Lifetime measurements will be used to obtain quenching constants for perylene and 9,10 dicyanoanthracence by carbon tetrachloride and used in calculation of the static quenching limit. The argon laser is a high intensity excitation source required for examining intrinsic fluorescence lifetimes and extrinsic fluorophore anisotropies. The multiple excitation wavelengths will be useful in global analysis of overdetermined data sets to characterize decay laws using discrete and distributed models.