DIELECTRIC STUDIES ON GLASS TRANSITIONS IN BIOLOGICAL-SYSTEMS

 
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1992 (EN)

DIELECTRIC STUDIES ON GLASS TRANSITIONS IN BIOLOGICAL-SYSTEMS (EN)

PISSIS, P (EN)
DAOUKAKIDIAMANTI, D (EN)
CHRISTODOULIDES, C (EN)
SIDERIS, EG (EN)
ANAGNOSTOPOULOUKONSTA, A (EN)
APEKIS, L (EN)

Despite several reports in the last years on glass transitions in different biological systems, their existence is still controversial. In this work we use the method of thermally stimulated depolarization currents, which is very sensitive to transitions and has been widely used in the study of glass transitions in synthetic polymeric systems, to investigate this question. The thermograms obtained with different systems (plant tissue, proteins, saccharides) show, at high water contents, transitions in the temperature range 170 to 200 K, which shift to higher temperatures with decreasing water content. Three features of the transitions, namely the dependence of their dynamics on water content, the dependence of their activation energies on temperature and the validity of compensation effects, reveal, in analogy to synthetic polymeric systems, the existence of two glass transitions, probably due to the hydration water and the matrix structure, respectively. (EN)

journalArticle (EN)

Water Content (EN)
Glass Transition (EN)
TEMPERATURE (EN)
Activation Energy (EN)
Engineering, Electrical & Electronic (EN)
DYNAMICS (EN)
PROTEINS (EN)
Biological Systems (EN)
SCATTERING (EN)
WATER (EN)


IEEE TRANSACTIONS ON ELECTRICAL INSULATION (EN)

English

1992 (EN)

10.1109/14.155804 (EN)
0018-9367 (EN)
4 (EN)
27 (EN)
820 (EN)
ISI:A1992JK58900024 (EN)
825 (EN)

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC (EN)




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