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Main sol. 1042

Internal Solution-ID: S2110

Equipment needed: Filter Autoclave Hungate tubes Gassing station
Compound Amount Unit Conc. [g/L] Conc. [mM]
Sea Salt
(SIGMA)
30.0 g 29.851 -
NaNO3 1.0 g 0.995 11.707
Wolfe's mineral elixir 2.0 ml - -
VOSO4 x 5 H2O
(0.01% w/v)
0.5 ml 5.0e-5 2.0e-4
Sodium resazurin
(0.1% w/v)
0.5 ml 5.0e-4 0.002
FeSO4 x 7 H2O 0.1 g 0.1 0.358
NaHCO3 1.0 g 0.995 11.845
Yeast extract 0.5 g 0.498 -
Na-pyruvate 1.0 g 0.995 9.042
Wolin's vitamin solution (10x) 2.0 ml - -
Distilled water 1000.0 ml - -
1 Dissolve ingredients (except ferrous sulfate, bicarbonate, yeast extract, pyruvate and vitamins), adjust pH to 7.0 and sparge medium with 100% N2 gas for 30 - 45 min to make it anoxic. Dispense the medium under same gas atmosphere into Hungate-type tubes or serum vials and autoclave. Add ferrous sulfate, bicarbonate, yeast extract, pyruvate and vitamins from sterile anoxic stock solutions prepared under 100% N2 gas and bicarbonate from a sterile anoxic stock solution prepared under 80% N2 and 20% CO2 gas atmosphere. Prepare the stock solution of ferrous sulfate by dissolving 1% (w/v) FeSO4 x 7 H2O in 0.1 N H2SO4. The stock solutions of pyruvate and vitamins should be sterilized by filtration. Adjust pH of the complete medium to 6.8-7.0.
2 Note: It may be necessary to add 10-20 mg sodium dithionite per liter (e.g. from 5% (w/v) solution, freshly prepared under 100% N2 and filter-sterilized), if the medium is not completely reduced after inoculation.
1042 VULCANIBACILLUS MEDIUM