News Finding: It was very puzzling."
Paper Finding: These results, consistently found by sampling over 20 cells, confirm the prediction from simulations: while all the bacteria point in the same direction (outward), the bulk microswimmers move overall in a backward fashion, opposite to the boundary layer motion.
News Context: But there was no intuitive way to explain what was happening with the dual-motion vortex. It was very puzzling." Those simulations showed that when individuals swimming in random trajectories start bumping into each other in a confined circular space, they tend to orient each other to the same angle relative to the circular boundary.
Paper Context: Yet, the relation between the flagella position and the mean membrane position and the flagella bundling at the rear of the bacteria reveal that the cell is pointing to the topleft corner, in a direction opposite to its motion. These results, consistently found by sampling over 20 cells, confirm the prediction from simulations: while all the bacteria point in the same direction (outward), the bulk microswimmers move overall in a backward fashion, opposite to the boundary layer motion. As shown in previous sections, experiments and simulations with both steric and hydrodynamical interactions are in qualitative agreement on both micro-and macroscopic scales.