Pulsed-field-remanence measurements on individual magnetotactic bacteria |
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| Institution: | 1. MARUM-Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Bremen, Germany;2. Institut des Sciences de la Mer de Rimouski (ISMER), Canada Research Chair in Marine Geology, Université du Québec à Rimouski and GEOTOP, Canada;3. Natural Resources Canada, Geological Survey of Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada;4. School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil;1. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA;2. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA;3. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA;4. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA;5. Department of Physics, Harvard University, Cambridge, MA, USA;6. Carl Zeiss X-ray Microscopy Inc., Pleasanton, CA, USA;7. Department of Earth Sciences, University of Cambridge, Cambridge, UK;1. Department of Earth Science and Engineering, Imperial College London, SW7 2BP, UK;2. Instituto Mexicano del Petróleo, 07730, Mexico;3. School of GeoSciences, University of Edinburgh, EH9 3FE, UK;4. Research School of Earth Sciences, Australian National University, ACT 2601, Australia;5. Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, CA 92093, United States of America;6. Research Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 305-8567, Japan;1. MARUM-Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Bremen, Germany;2. LSCE/IPSL, Laboratoire des Sciences Du Climat et de L’Environnement (CEA-CNRS-UVSQ), Université Paris-Saclay, 91190, Gif-Sur-Yvette, France;3. Institut des Sciences de La Mer de Rimouski (ISMER), Canada Research Chair in Marine Geology, Université Du Québec à Rimouski and GEOTOP, Rimouski, QC, Canada;4. Natural Resources Canada, Geological Survey of Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada;1. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St, Cambridge, MA, USA;2. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, USA;3. Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E California Blvd, Pasadena, CA, USA;4. Department of Anthropology, Harvard University, 11 Divinity Ave, Cambridge, MA, USA;5. Department of Anthropology, Yale University, 10 Sachem St, New Haven, CT, USA;6. Instituto Nacional de Sismología, Vulcanología, Meteorlogía e Hidrología (INSIVUMEH), 7a Avenida 15-47, Guatemala City, Guatemala;7. School of Environmental Sciences, University of Liverpool, 4 Brownlow St, Liverpool, L69 7ZE, UK;1. Department of General Zoology, Faculty of Biology, University of Duisburg-Essen, 45117 Essen, Germany;2. Department of Game Management and Wildlife Biology, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 129, 165 21 Prague 6, Czech Republic;3. Department of Zoology, Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České Budějovice, Czech Republic |
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| Abstract: | We measured pulsed-magnetic-field remanences of individual cells of two types of magnetotactic bacteria. Wild-type magnetic vibrios displayed square remanence curves with the reversal field, Hrev reaching values up to 825 Oe (65.7 kA/m). We attribute the generally high values of Hrev to the elongated shape of the magnetosomes (length-to-width ratio, e≈1.2) and to the comparatively short distances between the magnetosomes (8 nm). Cells of the rod-shaped Magnetobacterium bavaricum, on the other hand, which frequently contain more than 600 magnetosomes per cell, could gradually be demagnetised; the coercivity of remanence, Hcr of individual cells always ranged between 600 and 700 Oe (47.7–55.7 kA/m). The non-square remanence curves of M. bavaricum reflect a distribution of elongations and interactions between adjacent strands of magnetosomes within the braid-like chains. |
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