Towards a THz osmometer
Zafiropoulos, A., Hadjiloucas, S., Walker, G. C., Bowen, J. W. and Dudley, R. (2007) Towards a THz osmometer. In: 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and 15th International Conference on Terahertz Electronics, Vols 1 and 2. UNSPECIFIED, New York, pp. 295-296. ISBN 9781424414383
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This work discusses the use of a THz-transient spectrometer for the measurement of tissue water content. The relation of both mammalian- and plant-cell water content to the osmotic potential is discussed. The process of equilibration of tissue water potential with the water potential of water vapor in an osmometer cuvette is described. Observation of the THz transmittance through the water vapor provides a measure of the water activity and water potential in the sample. The possibility of performing dielectric relaxation measurements of the liquid water in the tissue at THz frequencies directly and the use of proline as marker of water stress in tissue are discussed.
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