FT-Raman光谱研究溶菌酶在氘代甲醇溶液中的构象变化

用ＦＴ－Ｒａｍａｎ光谱研究了在不同浓度的氘代甲醇－重水溶液中溶菌酶的构象。结果表明,随着氘代甲醇浓度的增加,溶菌酶结构逐渐松散,并形成凝胶。松散β－折叠结构增多是产生凝胶的原因。     

FT—Raman光谱及其应用

介绍了傅里叶变换拉曼光谱的原理以及它的优点和存在的问题。简述了它在高分子及橡胶、有机化合物、生物分子、医疗和药物、无机化合物、工业和农业产品及定量等方面的应用。讨论了傅里叶变换拉曼光谱在激发光源、光学过滤器、检测器、取样技术及联用技术方面的进展及其发展前景。     

FTIR和Raman用于盐酸曲马多的结构分析

采用AVATAR 360型傅里叶变换红外光谱仪和RM-1000型激光共聚焦拉曼光谱仪测定盐酸曲马多的红外光谱和拉曼光谱。拉曼光谱和红外光谱中均显示出了盐酸曲马多的特征峰,都能够用于其结构鉴别。采用红外、拉曼光谱这两种方法互相印证,互相补充,可增强鉴定的准确性、可靠性。     

Combined mass spectrometer and electron spectrometer for investigation of solids

The possibility to develop the electron-and-ion energy analyzer and mass spectrometer combined in one optical system for the investigation of the properties of solids has been considered. This device allows one to obtain information on the chemical composition and energy spectrum for all the particles emitted by the surface of a solid subjected to various effects in one experiment. The combined spectrometers are based on the source of the particle flux, which transforms the mass spectrum into the energy spectrum due to the effect of electric-field pulses on the ion flux, and the high-resolution electrostatic energy analyzer. The particles appear in the source as a result of the interaction of the exciting radiation from an independent source with the surface of the solid under study. The type of exciting radiation (fluxes of ions, atoms, electrons, and laser radiation) is chosen depending on the goals of the study. Numerical modeling of the device operation, which confirms the possibility of its implementation in the form of a compact informative system for the investigation of characteristics of solids, has been performed.     

The solution conformation of triarylmethyl radicals

Hyperfine coupling tensors to 1H, 2H, and natural abundance 13C were measured using X-band pulsed electron nuclear double resonance (ENDOR) spectroscopy for two triarylmethyl (trityl) radicals used in electron paramagnetic resonance imaging and oximetry: methyl tris(8-carboxy-2,2,6,6-tetramethyl-benzo[1,2d:4,5-d']bis(1,3)dithiol-4-yl) and methyl tris(8-carboxy-2,2,6,6-tetramethyl(-d3)-benzo[1,2d:4,5-d']bis(1,3)dithiol-4-yl). Quantum chemical calculations using density functional theory predict a structure that reproduces the experimentally determined hyperfine tensors. The radicals are propeller-shaped with the three aryl rings nearly mutually orthogonal. The central carbon atom carrying most of the unpaired electron spin density is surrounded by the sulfur atoms in the radical and is completely shielded from solvent. This structure explains features of the electron spin relaxation of these radicals and suggests ways in which the radicals can be chemically modified to improve their characteristics for imaging and oximetry.     

Fast dynamic Kerr-effect of lysozyme in solution

Dynamic Kerr effect and dielectric relaxation measurements were carried out for lysozyme at pH 4.7 and pH 7.7. From high dilution measurements we compute the shape of hydrodynamically equivalent ellipsoïd. Relaxation times corrected for viscosity effect are temperature dependent : this implies slight molecular shape variation. Denatured lysozyme relaxation is also observed before transition temperature.     

亚麻油组份的红外和拉曼光谱分析

亚麻油是重要的天然保健油。本文采用ＦＴＩＲ和ＦＴ－Ｒａｍａｎ光谱法定性分析了该油的组成,结果显示,亚麻油的各组分有其特征的ＩＲ和Ｒａｍａｎ频率,可以彼此区分开,这为今后亚麻油的定量分析和在线监控提供了重要的依据。     

Acoustic absorption and thixotropic structure in lysozyme solution

Summary The acoustic-absorption coefficient is measured in a 1% w/w lysozyme solution, at frequencies ranging from 5 to 50 MHz, as a function of time. It is shown that a relaxation process due to diffusional motion of clusters exists. Such a process is gradually quenched, as the interacting clusters become fixed in a thixotropic solidlike structure. The obtained results are discussed in the frame of a general model early proposed on the basis of viscosity and light scattering experiments.

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Riassunto Si è misurato il coefficiente di assorbimento acustico in una soluzione all' 1% di lisozima, a frequenze comprese tre 5 e 50 MHz, in funzione del tempo. Dalle misure fatte è evidenziato un processo di rilassamento, dovuto al movimento di diffrazione dei cluster. Tale processo va gradualmente spegnendosi allorché i cluster interagenti si uniscono in una struttura tixotropica. I risultati ottenuti sono discussi in termini di un modello già proposto in base a precedenti esperimenti di misure di viscosità e diffusione di luce.

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Резюме Измеряется коэффициент акустического поглощения в 1% w/w растворе лизоцима в области частот от 5 до 50 МГц, как функция времени. Показывается, что имеет место процесс релаксации, обусловленный диффузионным движением кластеров. Такой процесс релаксации постепенно затухает, когда взаимодействующие кластеры образуют тиксотропную структуру. Полученные результаты обсуждаются в рамках общей модели, предложенной ранее на оснобе экспериментальных измерений вязкости и рассеяния света.

     

草乌的拉曼光谱分析

草乌是一种重要的药用和有毒植物之一，本文采用FT-Raman光谱法定性分析了生，熟草乌的组成，结果显示，草乌因加工（熟草乌）和未加工（生草乌）其拉曼光谱有不同，造成这一现象的原因可甬由于生草乌加工泡制成熟草乌所致，即导致熟草乌的毒性低于生草乌，这将有助于生、熟草乌的质量控制与毒性分析。     

Resonance cell of EPR spectrometer for investigation of semimagnetic-semiconductor characteristics

The results of an experimental investigation of a quasi-optical open resonator (OR) with a Hg_1–xMn_xTe semiconductor are presented. The spectra and field distributions in such a resonator at 130 GHz are shown for three characteristic sample positions in the resonance volume. Recommendations for optimal design of the resonance cell are given. The optimum operating distance between the cavity mirrors is determined to ensure the maximum sensitivity of the EPR spectrometer.Institute for Radio Electronics, Ukrainian Academy of Sciences, Khar'kov. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 38, No. 10, pp. 1077–1082, October, 1995.     

Multipurpose spectrometer TERLAB for depth selective investigation of surface and multilayer

The multipurpose spectrometer for nondestructive, depth selective investigation of physical and chemical properties of a surface and bulk is described. It realizes opportunities of Mössbauer and X-ray Fluorescence Spectroscopy in normal and TER-conditions, Mössbauer and X-ray diffractometry and also Mössbauer and X-ray Reflectometry. Some analytical characteristics and capabilities of a spectrometer are illustrated as an example of research with a model sample.