Postprint version. Published in Philosophical Transactions of the Royal Society of London Series B, Volume 304, Issue 1121, February 13, 1984, pages 567-574. Copyright © 1984 The Royal Society. The definitive version is available at http://dx.doi.org/10.1098/rstb.1984.0047.
NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.
The magnetotactic bacterium A. magnetotacticum contains ferrous ions, a low density hydrous ferric oxide, a high density hydrous ferric oxide (ferrihydrite) and Fe3O4, which is precipitated by partial reduction of the ferrihydrite precursor.