Abstract
1. 1. The addition of sulfide to sea-water in respirometer flasks stimulated oxygen uptake by intact Solemya velum; at concentrations of 0.5 and 0.8 mM, the experimental rates were 1.8 and 2.5 times control rates. 2. 2. Extracts of gill tissue catalyzed the conversion of thiosulfate to sulfite, the production of adenosine phosphosulfate (APS) from AMP and sulfite and the formation of ATP from APS. The enzymes, thiosulfate sulfurtransferase (EC 2.8.1.1), adenylsulfate reductase (EC 1.8.99.2) and sulfate adenylyl transferase (EC 2.7.7.4) have K m and V max in the same range as similar enzymes in other species. 3. 3. Calculations based on these experiments suggest that adenylylsulfate reduction is ordinarily catalyzed at no more than 8% of maximum velocity.
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