. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 340 THE BIOLOGY OF HYDRA : 1961 tioii of this metabolite at the center of the cell would be the sum of four factors. At the bottom would be the macroenvironmental background, which in the case of pCO^ is ^i atmosphere ( mm. Hg) in all samples of aerated water but atm. in mammalian H,pNH3, pC02,etc. Fig. 2. Rachevsky's graph of the four zones that together determine the final degree of anaerobiosis to which the DNA in the nucleus of a cell will be exposed. This same a
. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 340 THE BIOLOGY OF HYDRA : 1961 tioii of this metabolite at the center of the cell would be the sum of four factors. At the bottom would be the macroenvironmental background, which in the case of pCO^ is ^i atmosphere ( mm. Hg) in all samples of aerated water but atm. in mammalian H,pNH3, pC02,etc. Fig. 2. Rachevsky's graph of the four zones that together determine the final degree of anaerobiosis to which the DNA in the nucleus of a cell will be exposed. This same analysis holds for a multicellular mass of cells such as a slime mold pseudoplasmodium. Hydra, or developing frog egg. See Rachevsky (25) for mathematical equation that determines the profile of this graph Both of these backgrounds remain constant because the percentage COo in the air () is extremely constant while the pCO^ of the blood is homeostatically regulated by the medullary center of the brain. Above the background zone in Rachevsky's graph is seen the halo zone referred to above. This is the external gradient that forms around any respiring cell under stagnant conditions. It reflects both stagnation and crowding for the group effects mentioned above also increase as population density 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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