Effect of applied magnetic fields on motility and magnetotaxis in the uncultured magnetotactic multicellular prokaryote 'Candidatus Magnetoglobus multicellularis'.

摘要: Magnetotactic bacteria are found in the chemocline of aquatic environments worldwide. They produce nanoparticles magnetic minerals arranged chains cytoplasm, which enable these microorganisms to align fields while swimming propelled by flagella. diverse phylogenetically and morphologically, including cocci, rods, vibria, spirilla also multicellular forms, known as magnetotactic prokaryotes (MMPs). We used video-microscopy study motility uncultured MMP 'Candidatus Magnetoglobus multicellularis' under applied ranging from 0.9 32 Oersted (Oe). The bidimensional projections tridimensional trajectories where interpreted plane cylindrical helices fitted sinusoidal curves. results showed that 'Ca. M. do not orient efficiently low fields, reaching an efficiency about 0.65 at 0.9-1.5 Oe, four six times local field. Good (0.95) is accomplished for ≥10 Oe. For comparison, unicellular reach such Considering moment sufficient efficient alignment Earth's field, we suggest misalignments due flagella movements, could be driven photo-, chemo- and/or other types taxis.