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Download Dielectric Relaxation in Biological Systems: Physical by Valerica Raicu, Yuri Feldman PDF

By Valerica Raicu, Yuri Feldman

The research of dielectric homes of organic structures and their elements is necessary not just for basic medical wisdom but additionally for its functions in drugs, biology, and biotechnology. The linked procedure - often called dielectric spectroscopy - has enabled researchers to quick and competently collect time- or frequency-spectra of permittivity and conductivity and accredited the derivation and checking out of life like electric types for cells and organelles. this article covers the theoretical foundation and sensible points of the learn of dielectric houses of organic structures, similar to water, electrolyte and polyelectrolytes, suggestions of organic macromolecules, cells suspensions and mobile platforms. The authors' mixed efforts supply a complete and cohesive booklet that takes benefit of the services of a number of scientists enthusiastic about state-of-the-art learn within the particular sub-fields of bio-dielectric spectroscopy whereas holding its self-consistency via a number of discussions.

The first six chapters hide theoretical, methodological and experimental elements of rest and dispersion in organic dielectrics at molecular, mobile and mobile combination point. functions are awarded within the following chapters that are geared up within the order of elevated complexity, starting with natural water, amino acids and proteins, carrying on with with vesicles and easy cells akin to erythrocytes, after which with extra advanced, organelle-containing cells and mobile aggregates. because of its large assurance, the textual content will be used as a reference ebook via researchers, and as a textbook for upper-level undergraduate periods and graduate sessions in (bio) physics, clinical physics, quantitative biology, and engineering.

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Natl. Acad. Sci. USA, 1981, 78: 261–265. 117. , The Living State. New York: Academic Press, 1972, p. 8. 118. , Science Primers: Introductory. London: MacMillan, 1880, p. 19. 1 Dielectric Polarization in Static Electric Fields When a system of charges is subjected to a constant electric field, charge displacement occurs in a manner dependent on whether the charges are free or bound. If the charges are free, such as in the case of dilute electrolyte solutions, the displacement leads to the translation of positive charges in the direction of the field and of negative charges in opposite direction.

48. Gorter, E. , On bimolecular layers of lipoids on the chromocytes of the blood. J. Exp. , 1925, 41: 439–443. 49. S. , Dispersion and absorption in dielectrics. I. Alternating current characteristics. J. Chem. , 1941, 9: 341–351. 50. S. , Dispersion and absorption in dielectrics. II. Direct current characteristics. J. Chem. , 1942, 10: 98–105. 51. , Electric impedance of suspensions of Arbacia eggs. J. Gen. , 1928, 12: 37–54. 52. , Electric phase angle of cell membranes. J. Gen. , 1932, 15: 641–649.

The papers of Höber [30] and Fricke and Morse [36] were cited as the scientific sources for this assumption, together with that of Curtis and Cole who had shown that the squid giant axon possessed similar electrical properties to that of the red blood cell [54]. Hodgkin and Rushton [53] also referred to the surprising discovery by Cole and Baker [55] that the squid axon exhibited an inductive reactance below 150 Hz (see Figure 3(c) for the proposed equivalent circuit). Following the development of the patch-clamp technique by Cole [56] an understanding of the implications of this inductive element in the membranes of nerve cells could begin, leading to the elucidation of nerve pulses in terms of “reversible alterations in sodium and potassium permeability arising from changes in membrane potential” [57] and the award of the Nobel Prize to Hodgkin and Huxley in 1963.

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