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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:13 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
X and Q band EPR investigation of free radicals kinetics of γ-irradiated Limnonectes macrodon frog legs
Authors:
C.D. Negut (1,2), V. Bercu (1), O.G. Duliu (1)
Affiliation:
1University of Bucharest, Department of Atomic and Nuclear Physics, P.O. Box MG-11, 077125 Magurele (Ilfov), Romania
2 Horia Hulubei National Institute for Physics and Nuclear Engineering,
P.O. Box MG-6, 077125 Magurele (Ilfov), Romania
E-mail
vbercu@gmail.com
Keywords:
frog legs, free radical kinetics, EPR spectroscopy, gamma irradiation, Arrhenius plot
Abstract:
The results concerning X as well as Q band EPR spectra of 60Co gamma ray irradiated Limnonectes macrodon frog legs are presented and discussed. Investigated EPR spectra showed with clarity the presence of two species of free radicals, whose overall X and Q band spectrum pointed toward an axial local symmetry with a small orthorhombic distortion. The Arrhenius plot of 15 kGy irradiated bones evidenced two different kinetic regimes with different activation energies while an isothermal annealing at 100 oC confirmed these observations pointing towards a significantly more labile irradiation radicals with respect to mammal bone tissue. Moreover, both X and Q band spectra showed the presence of Mn2+ ions.
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