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Originally published as Biophys J. BioFAST on May 25, 2007.
doi:10.1529/biophysj.107.107474
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Biophysical Journal 93:1402-1412 (2007)
© 2007 The Biophysical Society

Dynamics of Magnetotactic Bacteria in a Rotating Magnetic Field

Kaspars Erglis *, Qi Wen {dagger}, Velta Ose {ddagger}, Andris Zeltins {ddagger}, Anatolijs Sharipo {ddagger}, Paul A. Janmey {dagger} and Andrejs Cebers * §

* University of Latvia, Zellu, Latvia; {dagger} Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania; {ddagger} Latvian Biomedical Research and Study Centre, Riga, Latvia; and § Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania

Correspondence: Address reprint requests to Dr. A. Cebers, E-mail: aceb{at}tesla.sal.lv.

The dynamics of the motile magnetotactic bacterium Magnetospirillum gryphiswaldense in a rotating magnetic field is investigated experimentally and analyzed by a theoretical model. These elongated bacteria are propelled by single flagella at each bacterial end and contain a magnetic filament formed by a linear assembly of ~40 ferromagnetic nanoparticles. The movements of the bacteria in suspension are analyzed by consideration of the orientation of their magnetic dipoles in the field, the hydrodynamic resistance of the bacteria, and the propulsive force of the flagella. Several novel features found in experiments include a velocity reversal during motion in the rotating field and an interesting diffusive wandering of the trajectory curvature centers. A new method to measure the magnetic moment of an individual bacterium is proposed based on the theory developed.




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[Abstract] [Full Text] [PDF]


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