1. Mechanics of Active Fluids and Bacterial Physics Lab, Department of Civil and Environmental Engineering, Western University, London, ON N6A 3K7, Canada
2. Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France
3. Department of Mechanical and Materials Engineering, Western University, London, ON N6A 3K7, Canada
4. Laboratoire AstroParticules et Cosmologie (APC), CNRS, Université de Paris Cité, 75205 Paris, France