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Titolo:
A comprehensive approach to electro-orientation, electrodeformation, dielectrophoresis, and electrorotation of ellipsoidal particles and biological cells
Autore:
Gimsa, J;
Indirizzi:
Univ Rostock, Fachbereich Biol, D-18051 Rostock, Germany Univ Rostock Rostock Germany D-18051 eich Biol, D-18051 Rostock, Germany
Titolo Testata:
BIOELECTROCHEMISTRY
fascicolo: 1, volume: 54, anno: 2001,
pagine: 23 - 31
SICI:
0302-4598(200108)54:1<23:ACATEE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIELECTRIC-SPECTROSCOPY; ERYTHROCYTE-MEMBRANES; FIELD; MODEL; POLARIZATION; SUSPENSIONS; DEFORMATION; ROTATION; FORCES; BLOOD;
Keywords:
dielectric cell properties; AC-electrokinetics; impedance; single-shell model; Laplace equation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Gimsa, J Univ Rostock, Fachbereich Biol, Wismarsche Str 8, D-18051 Rostock, Germany Univ Rostock Wismarsche Str 8 Rostock Germany D-18051 k, Germany
Citazione:
J. Gimsa, "A comprehensive approach to electro-orientation, electrodeformation, dielectrophoresis, and electrorotation of ellipsoidal particles and biological cells", BIOELECTRO, 54(1), 2001, pp. 23-31

Abstract

Suspended cells may respond to AC polarization by orienting, deforming, moving or rotating. For modeling of ellipsoidal cells, a new dipole approach is proposed. Along each of the principal axis of the model, three finite elements of arbitrary but equal cross-sectional area for the interior, low conductive membrane shell and exterior are assumed. The length of the external medium elements is defined by influential radii which are related to the depolarizing factors. The model predicts the potential at the ellipsoid's surface leading to the induced dipole moment. The moment obtained is identical to the Laplace approach for homogeneous ellipsoids; in the single-shell case, it is slightly different. The reason is the constant shell thickness which overcomes the confocal thickness necessary for the Laplace solution. Expressions for electro-orientation, deformation, dielectrophoresis, and electrorotation are derived. In linearly and circularly polarized fields, different orientation spectra are predicted to occur. While in linearly polarized AC fields, particles are oriented along their axis of highest polarizability, in circularly polarized fields, the axis of lowest polarizability isoriented perpendicular to the plane of field rotation. Based on this finding, a new electro-orientation method is proposed. In dielectrophoresis and electrorotation, reorientations are predicted which lead to discontinuous spectra. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 08:15:08