DIELECTRIC STUDIES ON GLASS TRANSITIONS IN BIOLOGICAL-SYSTEMS

PISSIS, P; ANAGNOSTOPOULOUKONSTA, A; APEKIS, L; DAOUKAKIDIAMANTI, D; CHRISTODOULIDES, C; SIDERIS, EG

dc.contributor.author	PISSIS, P	en
dc.contributor.author	ANAGNOSTOPOULOUKONSTA, A	en
dc.contributor.author	APEKIS, L	en
dc.contributor.author	DAOUKAKIDIAMANTI, D	en
dc.contributor.author	CHRISTODOULIDES, C	en
dc.contributor.author	SIDERIS, EG	en
dc.date.accessioned	2014-03-01T01:08:46Z
dc.date.available	2014-03-01T01:08:46Z
dc.date.issued	1992	en
dc.identifier.issn	0018-9367	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10671
dc.subject	Activation Energy	en
dc.subject	Biological Systems	en
dc.subject	Glass Transition	en
dc.subject	Water Content	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.other	PROTEINS	en
dc.subject.other	WATER	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	SCATTERING	en
dc.subject.other	DYNAMICS	en
dc.title	DIELECTRIC STUDIES ON GLASS TRANSITIONS IN BIOLOGICAL-SYSTEMS	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/14.155804	en
heal.identifier.secondary	http://dx.doi.org/10.1109/14.155804	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	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
heal.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC	en
heal.journalName	IEEE TRANSACTIONS ON ELECTRICAL INSULATION	en
dc.identifier.doi	10.1109/14.155804	en
dc.identifier.isi	ISI:A1992JK58900024	en
dc.identifier.volume	27	en
dc.identifier.issue	4	en
dc.identifier.spage	820	en
dc.identifier.epage	825	en