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Abstract #1254

EPR measurements on human brain tissue at variable temperature

Fábio Seiji Otsuka1, Carlos Salmon1, Otaciro Nasimento2, and Maria Otaduy3
1Physics Department, University of São Paulo, Ribeirão Preto, Brazil, 2Physics Institute, University of São Paulo, São Carlos, Brazil, 3Medical School, University of São Paulo, São Paulo, Brazil

On this work it was evaluated the EPR measurements at variable temperature on tissue samples from different brain regions. For all samples, four different peaks were observed and their relationship with temperature were analyzed. High-spin rhombic iron(g = 4.3), copper(g = 2.06, g = 2.28) and organic radical (g = 1.989) peaks showed a Curie behavior with antiferromagnetic contributions. By other hand, a broad peak centered at g = 2.0 showed an antiferromagnetic behavior with Curie contribution. Additionally, a fifth peak was observed only for the Locus Coeruleus sample with a temperature dependent g-value (3.62 - 2.55).

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