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Prepare the medium and boil, cool under N2:CO2 (80:20 v/v). Dispense medium into Hungate tubes or serum bottles under N2:CO2 (80:20 v/v), autoclave. To the sterile medium add from sterile stock solutions 2% Na2S x 9 H2O (0.1ml/10ml), 10% NaHCO3 (0.5ml/10ml), and 0.2% sodium dithionite (0.05ml/10ml). Final pH 7.0
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