Microwave dielectric loss of bacillus subtilis spores in aqueous suspensions

The dielectric loss of Bacillus Subtilis spores in aqueous suspensions has been investigated at the frequency of 10.0 GHz over the temperature range from 0 to 60°C using a resonant cavity technique. The experimental results show a remarkable anomaly in the temperature dependence of ϵ″ around 40 ÷ 45...

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Bibliographic Details
Published in:Journal of colloid and interface science 1975-01, Vol.51 (1), p.191-195
Main Authors: Ballario, Carlo, Bonincontro, Adalberto, Cametti, Cesare
Format: Article
Language:English
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Summary:The dielectric loss of Bacillus Subtilis spores in aqueous suspensions has been investigated at the frequency of 10.0 GHz over the temperature range from 0 to 60°C using a resonant cavity technique. The experimental results show a remarkable anomaly in the temperature dependence of ϵ″ around 40 ÷ 45°C. This behavior is qualitatively identical to that previously observed for polystyrene aqueous suspensions. The results were interpreted semiquantitatively in terms of water layers adjacent to the spore membranes with different dielectric properties from those of bulk water. The fractional volume of modified water is estimated by assuming a simple dielectric mixture equation.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(75)90096-X