Figure 7
From: Phototaxis as a Collective Phenomenon in Cyanobacterial Colonies
Changing the direction of light. Cells in a colony of density ρ = 0.2 move toward a light source to the right until t = 2 × 105 at which time the position of light source is moved 90° clockwise. The cells reorient themselves and start moving toward the new direction of light. (a) Snapshot at t = 2 × 105 (b) Snapshot at t = 2.5 × 105.
