. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 384 THE BIOLOGY OF HYDRA : 1961 contracted somewhat. The huge vacuoles in the gastrodermal cells are diminished or absent. These acid phosphatase positive granules are of very uniform size. Figure 9 is an electron micrograph of a regressing hydranth (taken in collaboration with Dr. David Brandes of the Pathology Department, Baltimore City Hospitals) and shows the complete intracellular disorganization which takes place during this process. An occasional mitochondrion still seems to have
. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 384 THE BIOLOGY OF HYDRA : 1961 contracted somewhat. The huge vacuoles in the gastrodermal cells are diminished or absent. These acid phosphatase positive granules are of very uniform size. Figure 9 is an electron micrograph of a regressing hydranth (taken in collaboration with Dr. David Brandes of the Pathology Department, Baltimore City Hospitals) and shows the complete intracellular disorganization which takes place during this process. An occasional mitochondrion still seems to have a few cristae intact but the high degree of vacuolization and lamination in this section is completely foreign to the normal anatomy of this Fig. 10. Accumulation of acid phosphatase-positive granules in the tips of the tentacles of Hydra. Gomori stain. 500X. (From Brock and Strehler, un- published). For comparison in the succeeding figures, evidence of acid phosphatase activity in certain interesting regions of Hydra is pre- sented. Note the gradient of increasing acid phosphatase activity as one moves toward the tips of the tentacles. This activity is con- fined to the gastrodermal cells of the tentacle tips (Fig. 10). In the base, one also finds acid phosphatase activity in the pre-. 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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