Magnetic properties of the microorganism Candidatus Magnetoglobus multicellularis |
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Authors: | Marcelo Perantoni Darci M S Esquivel Eliane Wajnberg Daniel Acosta-Avalos Geraldo Cernicchiaro Henrique Lins de Barros |
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Institution: | 2. Escola de Engenharia, Universidade Federal do Rio de Janeiro, Cidade Universitária Bloco H, Sala H-220, Ilha do Fund?o, 21941-972, Rio de Janeiro, RJ, Brazil 1. Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, Urca, 22290-180, Rio de Janeiro, RJ, Brazil
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Abstract: | Magnetotactic microorganisms use the interaction of internal biomineralized nanoparticles with the geomagnetic field to orientate.
The movement of the magnetotactic multicellular prokaryote Candidatus Magnetoglobus multicellularis under an applied magnetic field was observed. A method using digital image processing techniques
was used to track the organism trajectory to simultaneously obtain its body radius, velocity, U-turn diameter, and the reorientation
time. The magnetic moment was calculated using a self-consistent method. The distribution of magnetic moments and radii present
two well-characterized peaks at (9 ± 2) × 10−15 and (20 ± 3) × 10−15 A m2 and (3.6 ± 0.1) and (4.3 ± 0.1) μm, respectively. For the first time, simultaneous determination of the distribution of the
organism radii and magnetic moment was obtained from the U-turn method by a new digital imaging processing. The bimodal distributions
support an organism reproduction process model based on electron microscopy observations. These results corroborate the prokaryote
multicellular hypothesis for Candidatus M. multicellularis. |
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Keywords: | Magnetotactic multicellular prokaryote Magnetic moment Nanomagnetism Uncultured microorganism U-turn method |
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