Magnetite in Freshwater Magnetotactic Bacteria
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TLDR
Results of Mossbauer spectroscopic analysis applied to whole cells identifies magnetite as a constituent of these magnetic bacteria in a previously undescribed magnetotactic spirillum isolated from a freshwater swamp.Abstract:
A previously undescribed magnetotactic spirillum isolated from a freshwater swamp was mass cultured in the magnetic as well as the nonmagnetic state in chemically defined culture media. Results of Mossbauer spectroscopic analysis applied to whole cells identifies magnetite as a constituent of these magnetic bacteria.read more
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References
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TL;DR: In this paper, a theoretical model of single-domain (SD) grain sizes is applied to magnetite and titanomagnetite, where transition to a two-domain configuration takes place at the SD threshold d0.
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TL;DR: In this article, particle size distributions have been obtained by grain counts on electron micrographs of four samples containing sub-microscopic equant magnetite particles, whose grains range from 100 to 650 A in size and are confirmed by a large increase of saturation remanence when the hysteresis of the sample is measured at 77°K.
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Bees have magnetic remanence.
TL;DR: Honey bees orient to the earth's magnetic field and may be associated with a region of transversely oriented magnetic material in the front of the abdomen that develops in the pupal state and persists in the adults.
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Magnetite in Denticle Capping in Recent Chitons (Polyplacophora)
TL;DR: In this paper, the X-ray diffraction patterns of the denticle material indicate the presence of magnetite, or possibly maghemite, in the chitons, which is the first indication that magnetite is precipitated by a biologic agent in sea water.