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Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods.

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Title: Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods.
Authors: Vyhnáleková, Silvia1 (AUTHOR) vyhnalekova2@uniba.sk, Miglierini, Marcel B.2,3 (AUTHOR), Cesnek, Martin3 (AUTHOR), Štefánik, Milan3,4 (AUTHOR), Matúš, Peter1 (AUTHOR)
Source: Journal of Radioanalytical & Nuclear Chemistry. Jun2025, Vol. 334 Issue 6, p4179-4188. 10p.
Subjects: Nuclear activation analysis, Aspergillus niger, Maghemite, Magnetite, Magnetic properties
Abstract: Structural alterations in non-stoichiometric magnetite induced by microorganisms are studied by nuclear methods. Magnetite samples were exposed to fungal strain known for its immobilization capabilities. Neutron activation analysis identified iron as the dominant element. The presence of maghemite in non-stoichiometric magnetite complicates the determination of iron sites by Mössbauer spectrometry. Mössbauer spectra recorded at 4.2 K display overlapping lines corresponding to tetrahedral and octahedral iron sites. Application of external magnetic field of 6 T improved the spectral resolution and revealed a presence of distinct sextets. Interaction with Aspergillus niger did not notably affect magnetite´s magnetic properties, indicating its stability. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Radioanalytical & Nuclear Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Radioanalytical+%26+Nuclear+Chemistry%22">Journal of Radioanalytical & Nuclear Chemistry</searchLink>. Jun2025, Vol. 334 Issue 6, p4179-4188. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Nuclear+activation+analysis%22">Nuclear activation analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Aspergillus+niger%22">Aspergillus niger</searchLink><br /><searchLink fieldCode="DE" term="%22Maghemite%22">Maghemite</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetite%22">Magnetite</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+properties%22">Magnetic properties</searchLink>
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  Data: Structural alterations in non-stoichiometric magnetite induced by microorganisms are studied by nuclear methods. Magnetite samples were exposed to fungal strain known for its immobilization capabilities. Neutron activation analysis identified iron as the dominant element. The presence of maghemite in non-stoichiometric magnetite complicates the determination of iron sites by Mössbauer spectrometry. Mössbauer spectra recorded at 4.2 K display overlapping lines corresponding to tetrahedral and octahedral iron sites. Application of external magnetic field of 6 T improved the spectral resolution and revealed a presence of distinct sextets. Interaction with Aspergillus niger did not notably affect magnetite´s magnetic properties, indicating its stability. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Radioanalytical & Nuclear Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10967-024-09863-2
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        Text: English
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        Type: general
      – SubjectFull: Aspergillus niger
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      – SubjectFull: Maghemite
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              Text: Jun2025
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