Iron Biominerals by Richard B. Frankel (auth.), Richard B. Frankel, Richard P.

By Richard B. Frankel (auth.), Richard B. Frankel, Richard P. Blakemore (eds.)

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The elegant experiments of Spormann and Wolfe (1984) clearly demonstrated that even in locales having a significant vertical geomagnetic field component, magnetotactic bacteria in natural enrichment populations could override magnetotaxis with other behavioral responses such as aerotaxis and stratify in aerotactic bands. Secondly, magnetotaxis is not essential for cell survival under all conditions. Cultures of A. magnetotacticum occasionally abruptly lose magnetism with no apparent effect on cell growth or survival, indicating that magnetotaxis is a dispensible trait in cells as cultured in the laboratory.

L. White and J. Yariv, Ferritin: design and function of an iron-storage molecule. Phil. Trans. R. Soc. Lond. B 304, 551-565 (1984). 49 MAGNETOTACfIC MAGNETOGENS Richard P. Blakemore and Nancy A Blakemore Department of Microbiology University of New Hampshire Durham, New Hampshire, 03824 INlRODUCTION It has been a decade and a half since magnetotactic bacteria and their ultrafine magnetic particles were first reported (Blakemore, 1975). The 15 year perspective provided by this first Iron Biominerals Conference reveals how these alluring (and at times frustrating) microbes have emerged from the unknown and integrated themselves into current thinking in diverse fields of study.

Williams, Structure and composition of ferritin cores isolated from human spleen, limpet (Patella vulgata) hemolymph and bacterial (Pseudomonas aeruginosa) cells. J. Mol. BioI. 188, 225-232 (1986). T. G. St Pierre, S. H. Bell, D. P. E. Dickson, S. Mann, J. Webb, G. R. Moore and R. J. P. Williams, M6ssbauer spectroscopy studies of the cores of human, limpet and bacterial ferritins. Biochim. Biophys. Acta 870, 127-134 (1986) . T. G. St Pierre, K-S. Kim, J. Webb and S. Mann, Biomineralization of iron: M6ssbauer spectroscopy and electron microscopy studies of ferritin cores from the chiton Acanthopleura hirtosa and the limpet Patella laticostata.

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