we have set the system in asymmetric conditions with respect to anions , so that a fast transportable anion ( e.g. , chloride ) was present in one side of the membrane and slow transportable anions ( e.g. , sulfate , phosphate , oxalate , isethionate , gluconate , hepes ) were present on the other side of the membrane .
C0003075
anions
C0038720
sulfate