title: Hydrogen ion activity in polychaete body fluids.
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D000845:Annelida / Q000032:analysis*; D001826:Body Fluids / Q000032:analysis*; D005215:Fasting; D006400:Hematocrit; D006863:Hydrogen-Ion Concentration; D008839:Microelectrodes; D012621:Seasons; D013045:Species Specificity; D013997:Time Factors