Results 31 to 40 of about 72,590 (284)

Modelling magnetite biomineralisation: the interactions of proteins and Fe3O4 surfaces [PDF]

open access: yes
The biosynthesis of magnetite is the earliest known example of biomineralisation; how-ever, much of the detailed atomistic mechanisms by which the process occurs are unknown. Within the bacterial strain Magnetospirillum magneticum AMB-1, the formation of
Monnington, Amy Elizabeth
core   +3 more sources

Observations of viscous magnetization in multidomain magnetite [PDF]

open access: yes, 2006
The viscous behavior of multidomain magnetite has been directly observed in both natural and synthetic samples using Bitter pattern imaging. A computer-controlled fully automated microscope fitted with a heating stage, field coils, and digital camera was
Williams, W.   +3 more
core   +1 more source

An integrated study of the electrical parameters of the samples of magnetite ores in relation to their genesis and mineral composition (on the example of the Goroblagodatskoe skarn-magnetite deposit)

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2019
The temperature dependences of electrical resistance (at DC and AC voltage at 1 kHz frequency) of the samples of the magnetite ore and magnetite from the contact of the syenite-porphyry with the volcanic-sedimentary rocks from the Goroblagodatskoye iron ...
V. V. Bakhterev
doaj   +1 more source

Effect of Ni2+, Zn2+, and Co2+ on green rust transformation to magnetite

open access: yesGeochemical Transactions, 2022
In this study, we investigated Ni2+, Zn2+, and Co2+ mineralogical incorporation and its effect on green rust transformation to magnetite. Mineral transformation experiments were conducted by heating green rust suspensions at 85 °C in the presence of Ni2+,
Orion Farr, Evert J. Elzinga, Nathan Yee
doaj   +1 more source

Correction to “Micromagnetic models of pseudo-single domain grains of magnetite near the Verwey Transition” [PDF]

open access: yes, 1999
Domain structures of small pseudo-single domain (PSD) magnetite near the Verwey transition (Tυ) at ≈120 K were modeled using an unconstrained three-dimensional micromagnetic algorithm.
A. R. Muxworthy   +3 more
core   +1 more source

Magnetite and magnetotaxis in microorganisms

open access: yesBioelectromagnetics, 1988
AbstractMagnetotactic bacteria from freshwater and marine sediments orient and navigate along geomagnetic field lines. Their magnetotactic response is based on intracellular, single magnetic domains of ferrimagnetic magnetite, which impart a permanent magnetic dipole moment to the cell.
Frankel, Richard B., Blakemore, R. P.
openaire   +4 more sources

Controlled biomineralization of magnetite (Fe3O4) by Magnetospirillum gryphiswaldense [PDF]

open access: yes, 2008
Results from a study of the chemical composition and micro-structural characteristics of bacterial magnetosomes extracted from the magnetotactic bacterial strain Magnetospirillum gryphiswaldense are presented here.
Tobler, D.J.   +9 more
core   +1 more source

Necessity of electrically conductive pili for methanogenesis with magnetite stimulation [PDF]

open access: yesPeerJ, 2018
Background Magnetite-mediated direct interspecies electron transfer (DIET) between Geobacter and Methanosarcina species is increasingly being invoked to explain magnetite stimulation of methane production in anaerobic soils and sediments.
Oumei Wang   +4 more
doaj   +2 more sources

Understanding viscous magnetization of multidomain magnetite [PDF]

open access: yes, 2006
Viscous magnetization (VM) and viscous remanent magnetization (VRM) have been measured, as a function of temperature, between room temperature and the Curie temperature using a suite of well-characterized synthetic and natural multidomain (MD) magnetite ...
Williams, W.   +3 more
core   +1 more source

Critical single-domain/multidomain grain sizes in noninteracting and interacting elongated magnetite particles: Implications for magnetosomes [PDF]

open access: yes, 2006
The critical size for stable single-domain (SD) behavior has been calculated as a function of grain elongation for magnetite grains using a numerical micromagnetic algorithm.
Muxworthy, Adrian R.   +1 more
core   +1 more source

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