Bound Water Structure on the Surfaces of Usnea antarctica as Observed by NMR and Sorption Isotherm

H. Harańczyk a, A. Pietrzyk b, A. Leja a and M.A. Olechc aInstitute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland bInstitute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland cInstitute of Botany, Jagiellonian University, Kopernika 27, 31-501 Kraków, Poland

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Received: 2005 20 05;

Hydration courses and proton free induction decays are recorded at 30 MHz for Usnea antarctica thalli hydrated from gaseous phase. NMR data combined with gravimetry allow one to distinguish two fractions of tightly bound water, and loosely bound/free water pool. No water fraction "sealed" in thallus structures is present in U. antarctica.

DOI: 10.12693/APhysPolA.109.411 PACS numbers: 82.56.Na, 87.16.Dg