title: Fluctuations in populations of 3 Vorticella species from an activated-sludge sewage plant.
mesh_terms: D000818:Animals; D016798:Ciliophora / Q000254:growth & development / Q000302:isolation & purification*; D002999:Clone Cells; D008722:Methods; D010100:Oxygen / Q000378:metabolism; D012722:Sewage
chemical_list: D012722:Sewage; D010100:Oxygen