TABLE 1.

Effect of addition of tyrosine on the intracellular pH of resting cells of E. faecium E17 at different external pH values

Cells	ΔpHa
	External pH 4.5	External pH 5.5	External pH 7
Tyr−	−0.95	−0.15	0.04
Tyr+	−1.20	−0.30	0.04

^aΔpH = pH_out − pH_in.