Preprint version. Journal of Geophysical Research, Volume 103, Issue B12, January 1, 1998, pages 30601-30604.
An edited version of this paper was published by AGU. Copyright © 1998 American Geophysical Union. Further reproduction or electronic distribution is not permitted. The definitive version is available at http://dx.doi.org/10.1029/97JB03512.
Magnetotactic bacteria construct an internal, permanent magnetic dipole based on single magnetic domain particles of magnetite or greigite. The organisms exert a high degree of control over the size and morphology of the particles. This may be relevant in distinguishing biogenic from nonbiogenic iron mineral particles.