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- W2409080306 abstract "Hemoglobin-oxygen equilibrium curves at constant pH, ionic strength, and temperature were determined (a) on 2,3-DPG-free solutions at various hemoglobin (Hb) concentrations, (b) on solutions at various Hb concentrations but constant 2,3-DPG/Hb molar ratio, (c) on solutions at constant hemoglobin concentration but various 2,3-DPG/Hb molar ratios, and (d) on hemolysates at various Hb concentrations. Under all conditions the shape of the equilibrium curve was the same (n = 2.62 +/- 0.04, 33 experiments). Half-saturation pressure (P 1/2) did not change with increasing Hb concentration in case (a), whereas P 1/2 was linearly related to Hb concentration in case (b). In case (c) at 200 g/l Hb, P 1/2 increased sharply as 2,3-DPG/Hb molar ratio increased up to 0.4 but changed little as the ratio was further increased up to 1.5. This behavior is very different from that observed in diluted (5 g/l) solutions. P 1/2 of the hemolysates was also linearly related to Hb concentration but the slope was about twice that for case (b). These results cannot be explained by linked function theory or by a dimer-tetramer equilibrium. It is suggested that intermolecular interactions in the presence of organic phosphates may be responsible for the observed changes in Hb affinity for oxygen." @default.
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- W2409080306 date "1977-01-01" @default.
- W2409080306 modified "2023-10-18" @default.
- W2409080306 title "Hemoglobin-oxygen equilibrium at different hemoglobin and 2,3-diphosphoglycerate concentrations." @default.
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