Abstract
Tetrahymena cultures forming bioconvection patterns were induced by CO 2 and NH 3 to accelerate the motion of their convection cells. Large channels formed between convection cells were shown to contain the penetrating gas. The gases are shown to inhibit organism motility and it is argued that such inhibition generates channel formation by causing a density overload of bioconvective pattern columns. As a result of this overload these columns of organisms precipitate before reaching the normal column junction or node thereby replacing the node with an open channel down which gas diffusion is enhanced.
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