title: Role and function of protozoa in the biological treatment of polluted waters.
mesh_terms: D000818:Animals; D056890:Eukaryota / Q000254:growth & development / Q000302:isolation & purification / Q000502:physiology*; D012722:Sewage; D014871:Water Microbiology; D014876:Water Pollution
chemical_list: D012722:Sewage