title: Effect of CO 2  and NH 3  on bioconvection: patterns in Tetrahymena cultures.
mesh_terms: D000641:Ammonia / Q000494:pharmacology*; D002245:Carbon Dioxide / Q000494:pharmacology*; D002449:Cell Aggregation / Q000187:drug effects*; D002465:Cell Movement / Q000187:drug effects; D002478:Cells, Cultured; D004058:Diffusion; D010477:Perfusion; D013268:Stimulation, Chemical; D013769:Tetrahymena pyriformis / Q000166:cytology*
chemical_list: D002245:Carbon Dioxide; D000641:Ammonia