to study the role of intracellular ca2+ in regulating renal tubular transport of ions and water , cytosolic calcium ion activity ( aica ) , cytosolic sodium ion activity ( aina ) , and intracellular ph ( phi ) in cells of isolated perfused proximal tubules of necturus kidney were measured with ca2+- , na+- , and h+-selective microelectrodes , respectively .
C1383501
cytosolic
C0007634
cells