Postprint version. Published in Biophysical Journal, Volume 47, Issue 3, March 1, 1985, pages 323-325.
NOTE: At the time of publication, the author Richard B. Frankek was not yet affiliated with Cal Poly.
The definitive version is available at http://dx.doi.org/10.1016/S0006-3495(85)83922-9.
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.