Abstract
Artemia cysts are composed of an inner mass of about 4000 cells surrounded by an acellular shell. This system can undergo cycles of hydration-dehydration without viability loss, and is a useful model for the study of intracellular water. We have measured the relative permittivity (ε′) of these cysts as a function of water content over the frequency range 0.8–70 GHz. Detailed analysis of the data for cysts containing close to 1 g H 2O/g dry weight indicates that a significant fraction of the total water in this system exhibits dielectric behavior different from that of pure water: the distribution parameter (α) for the dispersion analyzed by the Cole-Cole equation deviates from zero, and the permittivity of cyst water appears to be significantly lower than that of pure liquid.
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