Off-axis electron holography of magnetotactic bacteria: magnetic microstructure of strains MV-1 and MS-1

By R. Dunin-Borkowski, M. McCartney, M. Pósfai, R. B. Frankel, D. Bazylinski, Peter R. Buseck. 2001

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Magnetite as a prokaryotic biomarker: A review (2010, background): “…1994], an arrangement in which the total magnetic dipole moment of the cell is simply the sum of the permanent dipolemoments of the individual, single‐magnetic‐ domain magnetite particles [e.g., Penninga et al., 1995; Proksch et al., 1995; Suzuki et al., 1998; Dunin‐Borkowski et al., 1998, 2001].”
Properties of intracellular magnetite crystals produced by Desulfovibrio magneticus strain RS-1 (2006, background): “In other magnetotactic strains even small (<30 nm) and larger (>120 nm) magnetite crystals are single magnetic domains because of magnetic interactions among crystals in well-organized chains [38–40]; such interactions cannot occur in D.”
Ferromagnetic resonance and low-temperature magnetic tests for biogenic magnetite (2004, result): “They are Table 1 Summary of Moskowitz test results on all measured samples Sample d FC d ZFC d FC /d ZFC Biologically controlled magnetite 1 0.23 0.04 5.91 Lysed AMB-1 0.58 0.68 0.85 Old MS-1 0.11 0.09 1.15 Magnetofossil-bearing carbonates Clino 985V 0W 0.30 0.30 1.03 Clino 991V 0W 0.15 0.17 0.89 Cl”