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Studies on physiology and ecology of plankton, 33. In vivo O2-response to blood haemoglobin of Daphnia magna with special reference to time course in oxygenation and deoxygenation


, : Studies on physiology and ecology of plankton, 33. In vivo O2-response to blood haemoglobin of Daphnia magna with special reference to time course in oxygenation and deoxygenation. Science Reports of Niigata University Series D Biology, 21-28 No. 18

Employing microspectrophotometer and O2-analyzer, the response of O2 to Hb, the nature of which consists of both percentages of HbO2 and necessary time for O2 equilibrium, in single pink D. magna Straus perfused by the medium with varying concentration of O2 was studied with special reference to the time course in oxygenation and deoxygenation. The oxygenation of deoxygenated Hb is affected more by O2-concentration of the medium than the deoxygenation of oxygenated Hb. The change in time with change in O2-concentration is large in oxygenation; it is small in deoxygenation. The change in time for deoxygenation is small, which seems to indicate a physiological homeostasis of in vivo deoxygenation of Hb; this could be explained partly by indicating the intrinsic release of O2 from Hb to be accepted by the cytochrome, since the oxidation of cytochrome was inhibited by cyanide or azide to induce the time-delay in the deoxygenation. Results of an experiment on the whole body of the animal indicated the shortening of time necessary for oxygenation with rise of the initial O2-concentration of the medium. Other experiments indicated the shortening of time necessary for oxygenation with progress of thinning of the body parts, where O2-concentration of the blood must be larger (as if the artery) than that of the thick parts, the blood of which may be functionally as the vein, it is concluded that the length of time necessary for in vivo oxygenation of Hb is controlled largely by the amount of oxygenated Hb in the blood.

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