HR: 16:00h
AN: NS44A-03 INVITED     [Abstracts]
TI: Dielectric Response Of Complex Systems
AU: * Prodan, C
EM: cprodan@physics.ucsb.edu
AF: Department of Physics, University of California, Santa Barbara, CA 93105 United States
AU: Miller, J H
EM: jhmiller@uh.edu
AF: Department of Physics, University of Houston, Houston, TX 77024 United States
AB: The qualitative shape of the dielectric dispersion curves for living cells in suspensions or tissues was reported to exhibit prominent features: alpha, beta, gamma, delta regions. In this talk I will argue that the dielectric behavior at low frequencies is dominated by the effect of the diffusion of the free charges on the cell surfaces. The live cell suspensions are modeled as suspension of arbitrarily shaped, shelled and charged particles. The theoretical results are valid in the low range of frequencies (alpha region) as well as in the high range of frequencies (beta region). The dispersion curves are then measured experimentally by fast and nondestructives methods. By fitting the experimental data with the theoretical ones, I will argue that one can measure many cell parameters as: membrane potential, mobility of free charges or the volume fraction of the suspension.
DE: 0400 Biogeosciences
SC: Near-Surface Geophysics [NS]
MN: 2005 Joint Assembly