Bacterial Chemotaxis

Run-and-Tumble Navigation with Temporal Gradient Sensing

Running
Tumbling
Attractant
Repellent
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Generation: 0
Running: 0
Tumbling: 0
Avg Drift: 0
Sources: 0

Run and Tumble

E. coli navigates using a biased random walk. During runs, bacteria swim straight. During tumbles, they reorient randomly. When swimming up a gradient of attractant, bacteria extend runs (suppress tumbling). When swimming down the gradient, tumbles become more frequent. This temporal comparison allows navigation without spatial sensing.