Kraus 1996 J Exp Biol

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Kraus DW, Doeller JE, Powell CS (1996) Sulfide may directly modify cytoplasmic hemoglobin deoxygenation in Solemya reidi gills. J Exp Biol 199:1343-52.

Β» PMID: 9319227 Open Access

Kraus DW, Doeller JE, Powell CS (1996) J Exp Biol

Abstract: The clam Solemya reidi, which survives in sulfide-rich sediments, houses intracellular sulfide-oxidizing bacteria as symbionts in its gills. The gill bacteriocytes also contain a high concentration of cytoplasmic hemoglobin. Although the in situ hemoglobin optical spectrum was not altered in the presence of hydrogen sulfide, hemoglobin deoxygenation was significantly slowed and incomplete when sulfide was present. A sulfide-mediated decrease in oxygen consumption rate, a shift in intracellular pH or the conversion of hemoglobin to an unusual derivative could all slow in situ hemoglobin deoxygenation. However, under low sulfide levels at which deoxygenation is incomplete, oxygen consumption rate was not inhibited, intracellular pH decreased by less than 0.1 units and the only hemoglobin derivatives present were deoxyhemoglobin and oxyhemoglobin. These results and preliminary measurements of the isolated gill hemoglobin dissociation rate constants suggest that sulfide or a rapidly formed oxidation product may directly influence the rate of Solemya reidi gill hemoglobin deoxygenation. β€’ Keywords: Hemoglobin, Sulfide, Phylum Mollusca, Class Bivalvia

β€’ O2k-Network Lab: US AL Birmingham Kraus DW

Labels: MiParea: Respiration, Comparative MiP;environmental MiP 

Organism: Molluscs 

Regulation: pH, Substrate 

HRR: Oxygraph-2k 

Environmental Physiology; Toxicology 

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