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Oxidation of 13 CO to 13 CO 2 by O . algarvensis. 13 CO oxidation to 13 CO 2 in live and dead O . algarvensis worms was measured over 70 h after the addition of 13 CO (7 μM at start of incubations) and 13 CO 2 was produced. Mean values and standard deviations of four independent incubation bottles are plotted for each treatment and control. Standard deviations were very small in the first four time points and are therefore not visible.
