Figure 7. Anion substitutes other than lactate do not protect against vacuolation.

A shows an area of a Xenopus fibre at 30 min recovery in normal Ringer after fatigue. B shows essentially the same area at 30 min recovery in 50 mm glucuronate-Ringer after a second fatigue run (in normal Ringer). Scale bar is 20 μm. C, mean values (±s.e.m.) for number of vacuoles in 50 mm glucuronate-Ringer (n = 2) and in 50 mm methyl sulphate-Ringer (n = 2) (○); • are mean values for recovery in normal Ringer. Arrow indicates when a change was made from experimental solution to normal Ringer.