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Methylation across a sulfide gradient. Plots show filtered HgI, (solid circles) and turnover ([unfiltered MeHg]/[filtered HgI]) per billion cells (open squares) across a range of sulfide concentrations. Spike concentration was 1,000 ng liter−1, and cultures were incubated for 3 days. Averages for duplicate cultures are shown; error bars represent 1 standard deviation.
