New chemotaxis model: `SonMenolascina`

[mastrof]

Reference: Son, Menolascina & Stocker (2017) PNAS

• Revisitation of BrownBerg for Vibrio alginolyticus
• Binary chemokinesis (i.e., the microbe speed increases by a factor chemokinesis_factor whenever the local chemoattractant concentration overcomes a threshold cT)
• Speed-dependent bias (i.e., faster speed increases turn rate)
• Speed-dependent reverse-flick modulation (i.e., in a 4-state motility pattern the backward run can transition either towards a second reverse or a flick, in a way that depends on speed, with higher speed leading to higher flick probability)