title: Synchrony of division in mass cultures of Paramecium tetraurelia by a selective density-labelling technique.
mesh_terms: D000818:Animals; D008722:Methods; D008938:Mitosis / Q000187:drug effects*; D010247:Paramecium / Q000187:drug effects*; D013268:Stimulation, Chemical; D013635:Tantalum / Q000494:pharmacology*
chemical_list: D013635:Tantalum