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.)