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Changes in sulfide concentration in culture of PP31 incubated in the presence of various concentrations of p-xylene in the carrier phase. *, 0%; △, 0.2%; ○, 0.5%; □, 1%; ⋄, 2%; ▲, 4%; ●, 6%; ■, 8%; ◆, 10%; +, 15%; ×, abiotic control with 2% p-xylene.
