Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 21: Microswimmers (joint session BP/CPP/DY)
BP 21.2: Vortrag
Mittwoch, 14. März 2018, 15:30–15:45, H 1028
Magnetic behavior and chemotaxis of magnetic bacteria — •Agnese Codutti1, Damien Faivre1, and Stefan Klumpp2 — 1Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany — 2Georg-August-Universität Göttingen Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Chemotaxis is the bacterial ability to bias their motility toward a preferred concentration of attractants or repellents. This chemotactic ability can be used by magnetic bacteria, coupling it to a passive alignment to external magnetic fields. Magnetic bacteria include the naturally-occurring magnetotactic bacteria, and lab-produced bio-hybrids, in which for example E. coli can be coupled to external magnetic beads. Therefore, a model to understand the coupling between magnetic fields, active swimming, and chemotaxis is needed to predict the behavior of these systems. We perform simulations based on an Active Brownian Particle model, modified to include active swimming, active changes of directions, chemotaxis, and passive alignment with external magnetic fields. The model allows us to reproduce the capillary experiments, and to throw some light on the possible aerotaxis models shown by magnetotactic bacteria. As main results, we show how run and tumble motion hinders the chemotactic/aerotactic abilities of the bacteria when coupled with magnetic fields, while run and reverse motility benefits from the magnetic field, leading to faster chemotaxis. We explore different magnetic behaviors of magnetotactic bacteria, where cells are either simply aligned by the external field or alternatively using it as proxy of oxygen gradient.