title: Measuring intracellular free Ca2+ with single- and double- barreled ion-specific microelectrodes.
mesh_terms: D000818:Animals; D001826:Body Fluids / Q000032:analysis*; D002118:Calcium / Q000032:analysis*; D004594:Electrophysiology; D007424:Intracellular Fluid / Q000032:analysis*; D008839:Microelectrodes
chemical_list: D002118:Calcium