Spectral Representation Theory for Dielectric Behavior of Nonspherical Cell Suspensions |
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| Authors: | HUANG Ji-Ping YU Kin-Wah LEI Jun SUN Hong |
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| Institution: | Department of Physics, the Chinese University of Hong Kong, Shatin, NT, Hong Kong, China Department of Physics, the Chinese University of Hong Kong, Shatin, NT, Hong Kong, China Department of Applied Physics, Shanghai Jiao Tong University, Shanghai 200030, China Department of Applied Physics, Shanghai Jiao Tong University, Shanghai 200030, China;Department of Physics, University of California, Berkeley, California 94720-7300, U.S.A. |
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| Abstract: | Recent experiments revealed that the dielectric dispersion spectrum of fission yeast cells in a suspension was mainly composed of two sub-dispersions. The low-frequency sub-dispersion depended on the cell length, while the high-frequency one was independent of it. The cell shape effect was simulated by an ellipsoidal cell model but the comparison between theory and experiment was far from being satisfactory. Prompted by the discrepancy, we proposed the use of spectral representation to analyze more realistic cell models. We adopted a shell-spheroidal model to analyze the effects of the cell membrane. It is found that the dielectric property of the cell membrane has only a minor effect on the dispersion magnitude ratio and the characteristic frequency ratio. We further included the effect of rotation of dipole induced by an external electric field, and solved the dipole-rotation spheroidal model in the spectral representation.Good agreement between theory and experiment has been obtained. |
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| Keywords: | dielectric relaxation interfacial polarization cell model |
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