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Effects of Aging on Transformation of Biogenic Magnetite Nanoparticles
Journal of Nanoscience and Nanotechnology, 2018This study examined the microbial synthesis of magnetite and Pd/Zn-substituted magnetite using metal-reducing bacteria (Clostridium sp.), and the mineralogical characteristics of various types of magnetite formed initially and transformed minerals aged for 5 years.
Yungoo Song, Yul Roh, Kim Yumi
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Detection and function of biogenic magnetite [PDF]
, 2005 Magnetite is a widespread accessory mineral in rocks and soils. As was first shown by Lowenstam (1962), magnetite frequently forms also by biochemical processes, with varying degrees of control of the organisms over the mineralization process. Lowenstam distinguishes between biologically induced (BIM) and biologically controlled mineralization(BCM ...
Fernandez Davila, Alfonso
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TEM investigations of biogenic magnetite extracted from the human hippocampus
Biochimica Et Biophysica Acta - General Subjects, 1999Modification of chemical and magnetic extraction techniques has yielded biogenic magnetite/maghemite from human hippocampal tissue. Particles were identified using high resolution transmission electron microscopy, electron diffraction and elemental analysis.
Jon Dobson
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Biogenic vs. abiogenic magnetite nanoparticles: A XMCD study
American Mineralogist, 2008 X-ray magnetic circular dichroism (XMCD) experiments were carried out to compare the Fe2+/ Fe3+ ratio in nanomagnetite chemically produced from lepidocrocite and nanomagnetite biogenically produced by the Fe-reducing bacterium Shewanella putrefaciens. Together with TEM imaging, these measurements showed that the biotic magnetite nanoparticles were of ...
Carvallo, Claire +6 more
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Engineering Biogenic Magnetite for Sustained Cr(VI) Remediation in Flow-through Systems
Environmental Science & Technology, 2012 In this work, we report a route to enhance the reactivity and longevity of biogenic magnetite in Cr(VI) remediation under continuous-flow conditions by combining functionalization of the biomagnetite surface with a precious metal catalyst, nanoscale palladium, and exposure to formate. Column influent conditions were varied to simulate oxic, anoxic, and
Crean, Daniel E. +3 more
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Journal of Microscopy, 2001
We report biogenic magnetite whiskers, with axial ratios of 6 : 1, elongated in the [1 1 1], [1 1 2] and [1 0 0] directions, resembling the magnetite whiskers detected in the Martian meteorite ALH84001 by Bradley et al., and interpreted by those authors as evidence of vapour‐phase (abiogenic) growth.
Taylor, AP, Barry, JC, Webb, RI
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We report biogenic magnetite whiskers, with axial ratios of 6 : 1, elongated in the [1 1 1], [1 1 2] and [1 0 0] directions, resembling the magnetite whiskers detected in the Martian meteorite ALH84001 by Bradley et al., and interpreted by those authors as evidence of vapour‐phase (abiogenic) growth.
Taylor, AP, Barry, JC, Webb, RI
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Journal of Geophysical Research: Solid Earth, 2022 Marine sediments can preserve continuous paleomagnetic intensity records. Different magnetic minerals may acquire remanent magnetizations differently, so that compositional variations of magnetic mineral assemblages in sediments may hinder extraction of ...
Jiaxi Li +2 more
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Low‐temperature magnetic properties of pelagic carbonates: Oxidation of biogenic magnetite and identification of magnetosome chains [PDF]
Journal of Geophysical Research: Solid Earth, 2013 Pelagic marine carbonates provide important records of pastenvironmental change. We carried out detailed low-temperature magneticmeasurements on biogenic magnetite-bearing sediments from the SouthernOcean (Ocean Drilling Program (ODP) Holes 738B, 738C ...
Liao Chang +2 more
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Discrimination of biogenic and detrital magnetite through a double Verwey transition temperature
Journal of Geophysical Research: Solid Earth, 2016 Magnetite occurs widely in natural environments in both inorganic and biogenic forms. Discrimination of the origin of magnetite has important implications, from searching for past microbial activity to interpreting paleomagnetic and environmental ...
Liao Chang +2 more
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Presence of biogenic magnetite in ferromanganese nodules
Environmental Microbiology Reports, 2020Summary Transmission electron microscopy (TEM) and rock magnetic study of ferromanganese nodule sample JC120‐104B collected from Clarion‐Clipperton zone (CCZ) in the eastern Pacific Ocean indicate the presence of biogenic magnetite (magnetofossils).
Muhammad Bin Hassan +5 more
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