The magnetotactic bacterium Magnetococcus marinus swims with the help of two bundles of flagella, which are thread-like structures. This bacterium possesses a sort of intracellular 'compass needle' and their movements can be controlled using a magnetic field. So they can be used as a biological model for microrobots. An international team with participation from the University of Göttingen has investigated how these bacteria move and determined their swimming speed. The results were published in the journal eLife.