Abstract
AbstractIt has been found that cell‐free homogenates of tentacles and hydranths, but not of stems, are capable of inhibiting distal regeneration in Corymorpha palma. The results of several experiments on this species, and on Chlorohydra viridissima, Hydra littoralis, and H. pirardi have indicated that the observed inhibition was caused mainly by a nematocyst toxin, tetramethylammonium.This conclusion is supported by three independent lines of evidence: (1) direct counts of the nematocysts contained in tentacle, hydranth, and stem homogenates has shown that the amount of inhibitory activity is correlated with the number of nematocysts present; (2) tetramethylammonium was found to inhibit distal regeneration in transected polyps; and (3) paper chromatography of acetone extracts has demonstrated the presence of this quaternary ammonium compound in all species examined.
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