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Dielectric Relaxation in Biological SystemsPhysical Principles, Methods, and Applications$
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Valerica Raicu and Yuri Feldman

Print publication date: 2015

Print ISBN-13: 9780199686513

Published to Oxford Scholarship Online: August 2015

DOI: 10.1093/acprof:oso/9780199686513.001.0001

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Proteins in Solutions and Natural Membranes

Proteins in Solutions and Natural Membranes

(p.276) 3.4 Proteins in Solutions and Natural Membranes
Dielectric Relaxation in Biological Systems

Irina Ermolina

Yoshihito Hayashi

Valerică Raicu

Yuri Feldman

Oxford University Press

In the first part of the chapter, dielectric spectroscopy studies of globular proteins in aqueous solutions in native and denatured states are reviewed. Here we discuss the mechanisms of two major dielectric relaxation processes (γ- and β-dispersions) and one minor process (δ-dispersion) observed in the diluted globular protein solutions. Effects of protein concentration, temperature, pH, and denaturants were also summarized. The second part of the chapter presents the dielectric properties of proteins in natural membrane fragments and living cells membrane. Ferroelectric behavior was observed for the first time for the package of bacteriorhodopsin membrane fragments oriented in the electric field. Here, a discussion is also presented about progress and problems related to the observation of proteins in living cells using dielectric spectroscopy.

Keywords:   protein, dielectric relaxation, membrane proteins, living cell membrane, β-dispersion, δ-dispersion, γ-dispersion

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