Bacterial Colony & Chemotaxis — Run-and-Tumble Simulation

🦠 Bacteria Colony

Population N 300 Run speed 1.5 Chemotaxis bias 0.7 Tumble prob/frame 0.04 Nutrient diffusion D 0.4 Quorum threshold 6

Overlay

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alive bacteria

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mean nutrient

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biofilm cells %

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tumbles/frame

Run-and-tumble: bacteria run straight then tumble (random new direction). Chemotaxis reduces tumble rate when nutrient gradient is positive (swimming up-gradient). Quorum sensing: above local density threshold cells switch to slow biofilm mode (orange).