The dielectric relaxation of water in plant tissue

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The dielectric relaxation of water in plant tissue (EN)

Pissis, P (EN)

N/A (EN)

Thermally stimulated depolarization current (TSDC) measurements on plant leaves and stems of six different species in the temperature range of 77-300 K revealed the existence of three different dispersions. The first dispersion at low temperatures, which is attributed to the relaxation of loosely bound water molecules was studied in detail in an attempt to obtain information on the possible structures of water in plant tissue. Its characteristics differ for various plant tissues, indicating a different organization of water in those plant tissues. The dispersion can be described by a continuous distribution of relaxation times t with both the activation energy W and the pre-exponential factor To in the Arrhenius equation being distributed parameters. The spectrum of W and To was determined for E. globulus and O. europaea leaf samples. The mean values of T and W are larger and that of To smaller than the corresponding values for free (bulk) water. The results favour a model of the organization of water in clusters rather than in multilayers and indicate a stronger binding of water in living systems. © 1990 Oxford University Press. (EN)


Free and bound water (EN)
Distribution of relaxation times (EN)
Dielectric relaxation (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Journal of Experimental Botany (EN)



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