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- W2024192461 abstract "Magnetic bacteria are found in various morphologies as cocci. vibrios. spirilli and rods in aquatic mud layers. Magnetite (Fe 3 O 4 ) is stored in phospholipid vesicles as build-shaped, hexagonal or cubooctahydral crystals. Size and form of these crystals are species-specific and precisely controlled. The microaerophilic Magnetospirillum gryphiswaldense forms in a near to linear chain up to 60 cubooctahedral, single domain magnetite crystals of 42-45nm diameter, which generates a magnetic dipole. Six proteins were detected in SDS-gels of the special phospholipid vesicles, which envelope the magnetite crystals. These proteins are probably involved in iron transport (Fell or/and FeIII), in nucleation catalysis, in redox or/and pH control. Iron uptake and dynamics of magnetite crystal formation were estimated simultaneously by change of light scattering of the cells within homogeneous magnetic fields. A very efficient, energy-dependent uptake of FeIII in presence of spent, iron-deficient growth medium was found. Iron uptake was tightly coupled to magnetite crystal formation and magnetisation. When Fern was added to iron-starved cells under inducing conditions, FeIII was immediately transported into the cells and superparamagnetic crystals of less than 20nm were formed first within 30 min." @default.
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- W2024192461 date "1997-03-01" @default.
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- W2024192461 title "Iron Transport and Magnetite Crystal Formation of the Magnetic Bacterium Magnetospirillum gryphiswaldense" @default.
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- W2024192461 doi "https://doi.org/10.1051/jp4:19971267" @default.
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