Activator-Substrate Depletion — Reaction-Diffusion Patterns

D ratio (Ds/Da): 20 ρ (substrate supply): 0.08 κ (degradation): 0.06 Randomize Show Activator (A) Show Substrate (S) Show Both (split) Step: 0

Activator-substrate (Gierer-Meinhardt substrate-depletion) model: dA/dt = ρA²/S − κA + DaΔA; dS/dt = ρ₀ − ρA² + DsΔS. Unlike activator-inhibitor, here the substrate is consumed, creating depletion zones. Produces spots, stripes, and labyrinthine patterns.