Postprint version. Published in Biophysical Journal, Volume 47, Issue 3, March 1, 1985, pages 323-325. Copyright © 1985 Elsevier. The definitive version is available at http://dx.doi.org/10.1016/S0006-3495(85)83922-9.
NOTE: At the time of publication, the author Richard B. Frankek was not yet affiliated with Cal Poly.
The orientational relaxation of the magnetotactic bacterium Aquaspirillum magnetotacticum is observed by the decay of the optical birefringence upon switching off an aligning magnetic field. The data yield a rotational diffusion constant Dr ≅ 0.13 s1 and information about cell sizes that is consistent with optical microscopy data.