International School on Spectroscopy of Molecules and Crystals最新文献_第5页

Spectral and spatial characteristics of cw beams self-action in three-level media with inversionless amplification 具有无反转放大的三能级介质中连续波自作用的光谱和空间特性

International School on Spectroscopy of Molecules and Crystals Pub Date : 2002-12-01 DOI: 10.1117/12.486642

I. L. Plastun

引用次数: 0

NMR investigation of phenanthridine dyes self-association in aqueous solution. Structural and thermodynamical analysis 菲咯啉染料水溶液自缔合的核磁共振研究。结构和热力学分析

International School on Spectroscopy of Molecules and Crystals Pub Date : 2002-12-01 DOI: 10.1117/12.486666

A. N. Veselkov, A. Lantushenko

{"title":"NMR investigation of phenanthridine dyes self-association in aqueous solution. Structural and thermodynamical analysis","authors":"A. N. Veselkov, A. Lantushenko","doi":"10.1117/12.486666","DOIUrl":"https://doi.org/10.1117/12.486666","url":null,"abstract":"Phenanthridine dyes have pronounced mutagenic activity due to their intercalative binding with double-helical DNA. Although the structural significance in the interacalation process of the phenanthridinium chromophore is well established, the role ofits side chains is still under discussion. The comparative analysis of complexation with DNA of phenanthridinium dyes - ethidium bormide (EB) and its two photosensitive analogues: 3-amino-8-azido-5-ethyl-6-phenyl phenanthridinium bormide (EMB) and 3,80diazido-5-ethyl-6-phenyl phenanthridinium chloride (EDC) has shown that they have different affinities of binding with nucleotide sequences in aqueous salt solution. In order to test the role of azido-groups in side chains of EB chromophore on the drug-DNA affinity, the self-association of EB and its two azido-analogues have been studied in this work by one- and two-dimensional 1H-NMR spectrosocpy. Self-association of the aromatic drug molecuels has been studied using concentration and temperature dependences of proton chemical shifts. The equilibrium reaction constants, cooperativity parameters, the limiting values of proton chemical shifts and thermodynamical parameters-enthalpy and entropy of drug self-association have been determined for all the molecular system studied.","PeriodicalId":205850,"journal":{"name":"International School on Spectroscopy of Molecules and Crystals","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130750785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface electrical potential of the aligning polymer substrates and dielectric properties of LC layers 对准聚合物衬底的表面电势和LC层的介电性能

International School on Spectroscopy of Molecules and Crystals Pub Date : 2002-12-01 DOI: 10.1117/12.486657

R. Kravchuk, O. Yaroshchuk, O. Kovalchuk, P. Karageorgiev, B. Stiller, J. Stumpe

引用次数: 2

Site-selective red-edge spectroscopy of disordered materials and microheterogeneous systems: polymers, phospholipid membranes and proteins 无序材料和微非均相系统的位点选择性红边光谱:聚合物，磷脂膜和蛋白质

International School on Spectroscopy of Molecules and Crystals Pub Date : 2002-12-01 DOI: 10.1117/12.486641

A. Demchenko, S. Ercelen, A. Klymchenko

{"title":"Site-selective red-edge spectroscopy of disordered materials and microheterogeneous systems: polymers, phospholipid membranes and proteins","authors":"A. Demchenko, S. Ercelen, A. Klymchenko","doi":"10.1117/12.486641","DOIUrl":"https://doi.org/10.1117/12.486641","url":null,"abstract":"For aromatic fluorophores embedded into different rigid and highly viscous media with low structural order the spectroscopic properties do not conform to classical rules. The fluorescence spectra can depend on excitation wavelength, and the excited-state energy transfer, if present, fails at the 'red' excitation edge. These Red-Edge effects are observed due to the existence of excited-state distribution of fluorophores on their interaction energy with the environment and the slow rate of dielectric relaxations. In these conditions the site-selection can be provided by variation of energy of illuminating light quanta, and the behavior of selected species can be followed as a function of time and other variables. These observations foudn extensive application in different areas of research: colloid and polymer science, photophysics and molecular biophysics. Site-selection effects were discovered for electron-transfer and proton-transfer reactions if they depend on the dynamics of the environment. In this report we concentrate on fluroescence of 3-hydroxyflavone derivatives as the probes that exhibit the excited-state proton transfer reaction. The studies in polymer films, phospholipid membranes and in complexes with proteins allow characterizing the static and dynamic disorder in these systems.","PeriodicalId":205850,"journal":{"name":"International School on Spectroscopy of Molecules and Crystals","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128190093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Stimulated antistokes Raman emission spectrum from a movable focal region under self focusing 自聚焦下可动焦区的受激反斯托克斯拉曼发射光谱

International School on Spectroscopy of Molecules and Crystals Pub Date : 2002-12-01 DOI: 10.1117/12.486643

A. Ivanisik, G. Ponezha

引用次数: 0

Prospects of liqud crystal structures application in instrumental realizations of neural network matrix-tensor equivalental models (MTEM) 液晶结构在神经网络矩阵张量等效模型(MTEM)仪器实现中的应用前景

International School on Spectroscopy of Molecules and Crystals Pub Date : 2002-12-01 DOI: 10.1117/12.486651

V. Krasilenko, A. Nikolsky, M. Y. Bilynska, A. Pastushenko

{"title":"Prospects of liqud crystal structures application in instrumental realizations of neural network matrix-tensor equivalental models (MTEM)","authors":"V. Krasilenko, A. Nikolsky, M. Y. Bilynska, A. Pastushenko","doi":"10.1117/12.486651","DOIUrl":"https://doi.org/10.1117/12.486651","url":null,"abstract":"The structures of optical neural nets (NN) based on new matrix-tensor equivalental models (MTEMs) and algorithms are described in this article. MTE models are neuroparadigm of non-iterative type, which is a generalization of Hopfield and Hamming networks. The adaptive multi-layer networks, auto-associative and hetero-associative memory of 2-D images of high order can be built on the basis of MTEMs. The capacity of such networks in comparison with capacity of Hopfield networks is increased. The results of modeling show that the number of neurons in neural network MTEMs is 10-20 thousand and more. The problems of trailing of such networks, different modifications, including networks with double adaptive-equivalent autoweighing of weights, organization of computing process in different modes of network are discussed. The basic components of networks: matrix-tensor 'equivalentors' and variants of their realization on the basis of liquid-crystal structures and optical multipliers with spatial and time integration are considered. The efficiency of proposed optical neural networks on the basis of MTEMs is evaluated for both variants on the level of 109 connections per second. Modified optical connections are realized as liquid-crystal television screens.","PeriodicalId":205850,"journal":{"name":"International School on Spectroscopy of Molecules and Crystals","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117047432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6