Functional and biochemical properties of the Hemoglobins of the burrowing brittle star Hemipholis elongata Say (Echinodermata, Ophiuroidea).(Physiology and Biomechanics)

From: The Biological Bulletin | Date: August 1, 2003| Author: | Copyright information

The burrowing brittle star Hemipholis elongata (Say) possesses hemoglobin-containing coelomocytes (RBCs) in its water vascular system. The RBCs, which circulate between the arms and body, are thought to play a role in oxygen transport. The hemoglobin of adult animals has a moderate affinity for oxygen ([P.sub.50] = 11.4 mm Hg at pH 8, 20[degrees]C, measured in cellulo) and exhibits cooperativity (Hill coefficient > 1.7). The hemoglobin of juveniles has a higher affinity ([P.sub.50] = 2.3 mmHg at pH 8.0, 20 [degrees]C) and also exhibits cooperativity. The oxygen-binding properties of the ...

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