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Main sol. 1596

Internal Solution-ID: S3295

Equipment needed: Autoclave Hungate tubes Filter Gassing station
Compound Amount Unit Conc. [g/L] Conc. [mM]
NaCl 3.00 g 2.991 51.181
K2HPO4 1.00 g 0.997 5.724
NaHCO3 20.00 g 19.94 237.363
Na2CO3 15.00 g 14.955 141.102
NH4Cl 0.20 g 0.199 3.728
MgSO4 x 7 H2O 0.50 g 0.499 2.023
Trace elements solution (Pfennig & Lippert,1966) 1.00 ml - -
Selenite-tungstate solution 1.00 ml - -
Na-formate 3.40 g 3.39 49.845
Na-acetate 0.16 g 0.16 1.945
Yeast extract
(OXOID)
0.02 g 0.02 -
Wolin's vitamin solution (10x) 1.00 ml - -
Na2S x 9 H2O 0.25 g 0.249 1.038
Distilled water 1000.00 ml - -
1 Dissolve sodium chloride and hydrogenphosphate, then sparge solution with 100% N2 gas for at least 30 - 45 min to make it anoxic. Add and dissolve hydrogencarbonate and carbonate while gassing the head space only, then dispense under 100% N2 gas atmosphere into anoxic Hungate-type tubes or serum vials and autoclave. After autoclaving add ammonium chloride, magnesium sulfate, trace elements, formate, acetate, yeast extract, vitamins and sulfide from sterile anoxic stock solutions prepared under 100% N2 gas. Vitamins should be sterilized by filtration. The pH of the complete medium should be 9.5.
2 Note: Addition of 10 - 20 mg sodium dithionite per liter (e.g. from 5% (w/v) solution, freshly prepared under N2 and filter-sterilized) may stimulate growth at the beginning. For transfers use 5 - 10% inoculum.
1596 METHANOCALCULUS ALKALIPHILUS MEDIUM