... on proton-equivalent elimination by Urechis caupo , an echiuran worm that lacks intracellular symbionts (for brevity, we will hereafter refer to proton-equivalent elimination as `proton elimination'). Proton elimination by R. pachyptila and L. cf luymesi constitutes the worms' largest mass-specific...

... of HS on spontaneous and evoked contractions in vitro under hypoxic and anoxic conditions in nerve–muscle preparations from the echiuran worm Urechis caupo . Contraction amplitude in response to electric field stimulation under anoxic conditions was completely abolished by HS within minutes in a classic...