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Mössbauer and SQUID Characterization of Iron in Human Tissue: Case of Globus Pallidus

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Miglierini M., Boča R., Kopáni M., Lančok A.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
240-241
EN
Lyophilized samples of human brain tissue from the region of Globus Pallidus were investigated in powder form by ^{57}Fe Mössbauer spectroscopy and SQUID magnetometry. The obtained hyperfine parameters including isomer shift and quadrupole splitting exhibit a ferritin-like behaviour with high-spin Fe(III) sites. Three types of features were derived from temperature development of magnetic susceptibility: dominating diamagnetism, dominating paramagnetism, and intermediate states. The magnetic characteristics of the samples do not correlate with age of the donors.
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Mössbauer Spectrometry Study of Biological Tissues

100%
Bonková I., Miglierini M., Bujdoš M., Kopáni M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1081-1083
EN
Magnetic microstructure of iron contained in selected biological tissues is characterized and mutually compared. We have studied three types of biological samples prepared from human brain, human and horse spleen. Original samples were lyophilized (dried in a vacuum) thus providing powder forms. As a principal method of study, ⁵⁷Fe Mössbauer spectrometry in transmission mode was used. The Mössbauer spectrometry experiments were performed at room ( ≈300 K) and at liquid helium (4.2 K) temperature. At room temperature Mössbauer spectra show doublet-like features. Such behaviour indicates possible presence of nanoparticles with fluctuating magnetic moments that acquire arbitrary positions. On the other hand, low temperature Mössbauer spectrometry measurements demonstrate significant contribution of sextets that confirmed occurrence of blocked magnetic moments of iron-containing particles. Different relative contributions of magnetic components in the low temperature spectra for the three inspected biological tissues suggest differences in the blocking temperatures of the magnetic nanoparticles present in them.
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