. "Any process that activates or increases the activity of an ion transporter." . . . "positive regulation of ion transmembrane transporter activity" . "activation of ion transporter activity" . "positive regulation of ion transporter activity" . "stimulation of ion transporter activity" . "up regulation of ion transporter activity" . "up-regulation of ion transporter activity" . "upregulation of ion transporter activity" . . . . . . . .