Figure 4
From: Proton-driven sodium secretion in a saline water animal
Hindgut lumen pH visualized with phenol red indicator dye of A. taeniorhynchus larvae reared in 100% seawater. Intact alimentary canal was dissected from larvae following one hour incubation ion 0.1% phenol red in 100% seawater medium. Scale of pH colour with Phenol Red diluted in 100% seawater titrated to pH 6.5, 7.0, 7.5 and untitrated seawater with a pH of 8.2.
