Table 4.

Rates of acid gain following ion substitutions or additions of the inhibitors EIPA or DIDS. Comparisons between paired or grouped cover slips

		Rate of gain of acid (μm s−1)
		1	2	n	P
Initial rates during 1st recording intervals in the buffer solution indicated
A	(1) NaCl−Hepes, (2) NaCl−HCO3	7.0 ± 0.7	8.8 ± 1.1	34	0.21
Comparison of 2nd recording intervals
B	Two successive periods of either;	12.5 ± 2.7	15.3 ± 2.4	6	0.43
	(1) NaCl−HCO3
	(2) NaCl−HCO3+ 250 μm DIDS
C	(1) NaCl−Hepes → NMDGCl−Hepes			15	0.52
	(2) NaCl−Hepes → NaCl−Hepes + 5 μm EIPA	10.1 ± 1.0	11.0 ± 1.0	10	unpaired
D	(1) NaCl−Hepes → NMDGCl−Hepes	9.6 ± 1.1	33.6 ± 5.1	16	< 0.001
	(2) NaCl−HCO3→ NMDGCl−HCO3			18	unpaired