Dynamics of Iron Uptake and Fe3O4 Biomineralization during Aerobic and Microaerobic Growth of Magnetospirillum gryphiswaldense

AUTOR(ES)

Schüler, Dirk

FONTE

American Society for Microbiology

RESUMO

Iron uptake and magnetite (Fe3O4) crystal formation could be studied in the microaerophilic magnetic bacterium Magnetospirillum gryphiswaldense by using a radioactive tracer method for iron transport and a differential light-scattering technique for magnetism. Magnetite formation occurred only in a narrow range of low oxygen concentration, i.e., 2 to 7 μM O2 at 30°C. Magnetic cells stored up to 2% iron as magnetite crystals in intracytoplasmic vesicles. This extraordinary uptake of iron was coupled tightly to the biomineralization of up to 60 magnetite crystals with diameters of 42 to 45 nm.

Documentos Relacionados

• Synthesis and characterization of Fe3O4 nanoparticles with perspectives in biomedical applications
• Biochemical and Proteomic Analysis of the Magnetosome Membrane in Magnetospirillum gryphiswaldense
• Avaliação microestrutural e magnética de Fe3O4 sintetizada pelo método de reação de combustão
• β-Cyclodextrin coated Fe3O4 nanoparticles: a simple preparation and application for selective oxidation of alcohols in water
• Fe3O4-TiO2 and Fe3O4-SiO2 Core-shell Powders Synthesized from Industrially Processed Magnetite (Fe3O4) Microparticles