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Figure 3


Fig. 3. Dehydroascorbate (DHA) protects mitochondrial respiration with malate as a substrate from inhibition by sulfide. Oxygen consumption rates of mitochondria from the body wall tissue of Arenicola marina as a function of time. Additions (indicated by arrows) were 8 mmoll–1 malate and 1 mmoll–1 ADP. Subsequently 1 mmoll–1 DHA was added only to the assay shown by the black line at the time marked with X. The injection of 50 µmoll–1 sulfide inhibited malate respiration in the absence of DHA (gray line) and, by contrast, stimulated the oxygen consumption rate in the presence of DHA (black line).





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