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Mix ingredients, except NaHCO3, L-cysteine x HCl x H2O and Na2S x 9H2O, adjust pH to 7.5 - 8.0, and autoclave. Separately autoclave NaHCO3, L-cysteine x HCl x H2O and Na2S x 9H2O solutions (5% each) under a N2 atmosphere. Distribute the medium into culture vessels (e.g., 20 ml of medium in 120 ml serum bottles) under a stream of H2-CO2 (4:1, v/v) gas mixture and seal with butyl rubber stoppers. Prior to inoculation, add the sterile NaHCO3, L-cysteine x HCl x H2O and Na2S x 9H2O solutions aseptically and anaerobically. Pressurize the inoculated bottle to 200 kPa H2-CO2 (4:1, v/v).
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