title: Extremely low-frequency magnetic fields affect the movement of magnetotactic cocci
metadata.name: dc.contributor.author
metadata.value: de Melo, Roger Duarte
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Belova, Natalia
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Acosta-Avalos, Daniel
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2024-10-11T17:11:26Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2024-10-11T17:11:26Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2024-06
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: De Melo, R. D., Belova, N., and Acosta-Avalos, D. 2024. Extremely low-frequency magnetic fields affect the movement of magnetotactic cocci. Bio. Comm. 69(2): 69–75. https://doi. org/10.21638/spbu03.2024.202
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi. org/10.21638/spbu03.2024.202
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/47683
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Magnetotactic bacteria are microorganisms that swim following the geomagnetic
  field lines, because of an intracellular magnetic moment that aligns their
  body to the magnetic field lines. For that reason, these bacteria are appropriate
  for the study of microorganisms’ motion. The present paper studies the swimming
  trajectories of uncultured magnetotactic cocci under the effect of combined
  constant (DC) and alternating (AC) magnetic fields oscillating at frequencies
  that formally correspond to the cyclotron frequency for Ca2+, K+, Fe2+ and
  Fe3+ ions. The swimming trajectories were observed to be cylindrical helixes
  and their helix radiuses, frequencies, axial velocities and orientation angles of
  the trajectories relative to the constant magnetic field were determined. The
  orientation angles were used to calculate the magnetic to thermal energy ratio,
  which helps the study of the disorientating effect of the flagellar motion. Our
  results show that combined magnetic fields tuned to the resonance of Ca2+
  ions affect all the trajectory parameters. Frequencies associated to Ca2+ and
  K+ do not affect the bacterial swimming direction relative to the magnetic field
  direction. On the other hand, frequencies associated to Fe2+ and Fe3+ do change
  the bacterial swimming direction relative to the magnetic field direction, which
  means that those frequencies affect the flagellar function. These results show
  indirect evidence of the action of calcium binding proteins in the motility of
  magnetotactic cocci.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Biological Сommunications;Volume 69; Issue 2
metadata.lang: -
metadata.name: dc.subject
metadata.value: magnetotaxis
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: magnetotactic cocci
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Ion Parametric Resonance model
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Ion Cyclotron Resonance model
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: calcium-binding proteins
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: sheath-associated protein
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Extremely low-frequency magnetic fields affect the movement of magnetotactic cocci
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: Bio-Comm_69_2_69-75.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/47683/1/Bio-Comm_69_2_69-75.pdf
resources.format: Adobe PDF
resources.size: 1,53 MB