Dielectric behavior of wild-type yeast and vacuole-deficient mutant over a frequency range of 10 kHz to 10 GHz.
Dielectric behavior of Saccharomyces cerevisiae wild-type and vacuole-deficient mutant cells has been studied over a frequency range of 10 kHz to 10 GHz. Both types of cells harvested at the early stationary growth phase showed dielectric dispersion that was phenomenologically formulated by a sum of three separate dispersion terms: beta 1-dispersion (main dispersion) and beta 2-dispersion (additional dispersion) and gamma-dispersion due to orientation of water molecules. The beta 1-dispersion centered at a few MHz, which has been extensively studied so far, is due to interfacial polarization (or the Maxwell-Wagner effect) related to the plasma membrane. The beta 2-dispersion for the vacuole-deficient mutant centered at approximately 50 MHz was explained by taking the cell wall into account, whereas, for the wild-type cells, the beta 2-dispersion around a few tens MHz involved the contributions from the vacuole and cell wall.
Institute for Chemical Research, Kyoto University, Japan. asami@tampopo.kuicr.kyoto-u.ac.jp
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D002462:Cell Membrane / Q000502:physiology / Q000648:ultrastructure; D004594:Electrophysiology / Q000379:methods; D008962:Models, Theoretical; D009154:Mutation; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000502:physiology* / Q000648:ultrastructure*; D014617:Vacuoles / Q000502:physiology*