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Time course of anaerobic As(III) oxidation and As(V) reduction in Paoha Island biofilm slurry samples incubated under alternating regimens of light and dark. Dark symbols represent live samples, and open symbols are heat-killed controls. Symbols: ▴, As(III); ▪, As(V). Symbols represent the means of three slurries, and bars indicate ±1 standard deviation.
