FIGURE 7.

Simulated migration curves when oxygen consumption by the bacteria is included in the model. In this simulation set, the bacteria swim at the stated velocity with c_crit = 21 nM and f_hi = 1/(4 s). These results simulate the migration if they were to consume even 1/100th the amount of oxygen as would A. brasilense (∼0.1 fmol/(min·cell)). Notably, greater velocities increase the penetration of the bacteria into the high oxygen regions, where they consume greater oxygen before leaving, thereby slowing the advance of the oxygen front and the associated migration of the bacteria.