Fig. 8. P₅₀ (O₂ tension at half O₂ saturation) values of Thermarces cerberus (Therm) Hbs I and II and S. parasitica (Symen) Hbs I and II compared with those for Zoarces viviparus hemolysate (Zoarc), Hoplosternum littorale cathodic and anodic Hbs (Hoplo HbC and Hoplo HbA; Weber et al., 2000) and eel Anguilla anguilla cathodic HbC (Anguil HbC; Fago et al., 1995) at pH 7.0 and human Hb at pH 7.4 (Imai, 1982). Open columns, stripped Hbs; shaded columns, Hbs in the presence of 0.1 mol l^-1 KCl; solid columns, Hbs in the presence of 0.1 mol l^-1 KCl + saturating concentrations of ATP (fish Hbs) or 2,3-diphosphoglycerate (DPG; human Hb). Other conditions: 0.1 mol l^-1 Hepes buffer (fish Hbs) or 0.05 mol l^-1 Bis-Tris (Human Hb) and 25°C (20°C for Anguil HbC). (7.50 Torr=1 kPa.)

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