title: [The episomal factors of hemolytic activity in natural populations of E. coli].
mesh_terms: D000293:Adolescent; D002118:Calcium / Q000032:analysis; D002648:Child; D003743:Dental Enamel / Q000032:analysis*; D004926:Escherichia coli / Q000302:isolation & purification; D005260:Female; D005457:Fluoridation; D006801:Humans; D007180:Incisor; D008297:Male; D014867:Water / Q000032:analysis
chemical_list: D014867:Water; D002118:Calcium