By Gertz I. Likhtenshtein

ISBN-10: 0521017874

ISBN-13: 9780521017879

This monograph describes the theoretical bases and experimental necessities for ways comparable to spin fluorescence, triplet, Mössbauer, photochromic and electron-density labeling, together with the techniques used to procure in particular changed proteins, enzymes, biomembranes, nucleic acids, and different organic molecules. the basics of the actual thought in the back of each one approach is defined and info are given of ways to interpret the experimental information acquired. designated sections care for severe studies of contemporary information at the constitution, molecular dynamics and conformational transitions of organic molecules. each one part concludes with a dialogue of the consequences received from those suggestions in reference to numerous difficulties of enzyme catalysis, electron move, molecular biophysics and molecular biology. The makes use of that labeling strategies might be positioned to for the research of entire cells and tissues also are mentioned.

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13. 005, vm = 20 kHz) (Livshitz & Kuznetsov 1980). The method of spin labeling 29 saturation (Livshitz & Kuznetsov 1980). The T l e and T2e values are needed for the correct estimation of TC. Stationary ELDOR was found to be an efficient approach to determination of the saturation transfer parameters, including the ones dependent on the rotational diffusion (Hyde & Feix 1989). 1), which is related to the ratios between the amplitudes of various components of the ESR spectrum with and without saturation.

By such a technique a threedimensional picture of the spatial distribution of radicals was obtained (Ewert & Freed 1990). There is good reason to believe that certain difficulties in ESR tomography related to loss of sensitivity is samples of small size, dielectric adsorption of the MW field, and the complexity of theoretical analysis of three-dimensional objects, particularly for radicals with anisotropic magnetic parameters, will be overcome in the near future. 8. Spin traps A spin trap is a compound that is converted to a stable NR after reaction with an active radical.

The dipole-dipole interaction is more applicable to systems with remote centers. 2. 1. Principal effects Let us first consider the case of interaction of two paramagnetic centers with S = \\ they have the same parameters (g, A) and are characterized by isotropic exchange, with an exchange integral J (Abragam 1961; Abragam & Bleaney 1970). 2). As the temperature continues to drop, the intensity of the spectrum will begin to fall if the spins in the paired (singlet) state have lower energy than in the unpaired (triplet) state.

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Biophysical Labeling Methods in Molecular Biology by Gertz I. Likhtenshtein

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