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Dissolve ingredients of solution A (except MnO2), then sparge with 80% N2 and 20% CO2 gas mixture for 30 - 45 min to make it anoxic. Distribute solution A under the same gas atmosphere into anoxic Hungate-type tubes or serum vials containing the appropriate amount of MnO2 and autoclave at 121°C for 15 min. Solution B is autoclaved separately under an 80% N2 and 20% CO2 gas atmosphere, and solutions C, D, and E are autoclaved under a 100% N2 gas atmosphere. Solutions F and G are prepared under 100% N2 gas atmosphere and sterilized by filtration. To complete the medium appropriate amounts of solutions B to G are added to the sterile solution A in the sequence as indicated. The final pH of the complete medium should be 7.5.
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