Effect of solutes on the residual activity of A. fulgidus inositol monophosphatase, heated to 95 °C for 15 minutes, then cooled and assayed at 85 °C: ▲, KCl; Δ, NaCl; ■, K+-glutamate; □, Na+-glutamate. The inset shows the effect of the sodium salts of L,L- (○) and L,D- (●) DIP at 100 mM, as well as dimethylphosphate (DMP; X) and myo-inositol (◇) compared to the K+-salts solutes (dashed lines) shown in the main figure.