Table 1.

Solutions used for electrophysiological studies in Ussing chamber

	A	B	C	D	E	F	G	H	I	J	K
NaCl	150	—	150	—	—	75	140	140	20	20	10
ChCl	—	120	—	—	—	—	—	—	—	—	—
NH4Cl	—	—	—	150	—	—	1	10	—	—	—
CsCl	—	—	—	—	150	—	—	—	—	—	—
NaHCO3	—	—	—	—	—	—	—	—	22	2.2	22
CaCl2	2	2	2	2	2	2	2	2	2	2	2
MgCl2	1	1	1	1	1	1	1	1	1	1	1
Glucose	10	10	10	10	10	10	10	10	10	10	10
Hepes-Tris	—	—	10	10	10	10	10	10	10	10	10
pH	7.4	7.4	7.4	7.4	7.4	7.4	7.4	6.4	7.4	6.4	7.4
O2 (%)	100	100	100	100	100	100	100	100	95	95	95
CO2 (%)	—	—	—	—	—	—	—	—	5	5	5

Solute concentrations are mm. All solutions were adjusted with mannitol to an osmolarity of ∼320 mosmol l⁻¹. ChCl, choline chloride.