. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 174 THE BIOLOGY OF HYDRA : 1961. Toxin Fraction Fig. 3. Results of bioassay on groups of 10 ilea pugilator of: (0) whole crude toxin, and various fractions (1, 2, 3, 4) separated by electrophoresis from the crude toxin. Fractions were injected at levels approximating their separate concentration (by weight) in the crude toxin. undergoes characteristic hyperplasia beneath that portion of the epidermis containing mature nematocysts. This histological change involves structural polarization
. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 174 THE BIOLOGY OF HYDRA : 1961. Toxin Fraction Fig. 3. Results of bioassay on groups of 10 ilea pugilator of: (0) whole crude toxin, and various fractions (1, 2, 3, 4) separated by electrophoresis from the crude toxin. Fractions were injected at levels approximating their separate concentration (by weight) in the crude toxin. undergoes characteristic hyperplasia beneath that portion of the epidermis containing mature nematocysts. This histological change involves structural polarization, extensive vacuolation of the cyto- plasm, and a change in the staining characteristics and chromatic density of the nucleus (see Fig. 2). The mesoglea separating the hyperplastic gastroderm cells from the nematocyst-containing epi- dermis is also modified. In preparations stained with Mallory's trichrome, the mesoglea shows discrete circular patches which stain differently from the rest of the mesoglea. These patches are always located between hypertrophied gastroderm cells and cnidoblasts in the surface epithelium. We have shown the gastrovascular cavity of Physalia to contain and circulate a protein fluid. There is open communication between the gastrovascular cavity and tlie cavity of the battery. It is tempting to speculate that the modified gastrodenn cells basal to the cnido-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Symposium on the Physiology and Ultrastructure of Hydra and Some Other Coelenterates (1961 : Coral Gables, Fla. ); Lenhoff, Howard M; Loomis, W. Farnsworth (William Farnsworth), 1914-. Coral Gables, Fla. , University of Miami Press
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