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Main sol. 990

Internal Solution-ID: S2019

Equipment needed: Hungate tubes
Compound Amount Unit Conc. [g/L] Conc. [mM]
Sea Salt
(Sigma)
35.00 g 35 -
PIPES 3.46 g 3.46 11.443
Yeast extract 1.00 g 1 -
Peptone 4.00 g 4 -
Elemental sulphur 5.00 g 5 -
NH4Cl 0.50 g 0.5 9.348
KH2PO4 0.35 g 0.35 2.572
CaCl2 0.20 g 0.2 1.802
FeCl3 6.70 mg 0.007 0.041
Na2WO4 2.90 mg 0.003 0.01
Resazurin 0.10 mg 1.0e-4 4.4e-4
Na2S x 9 H2O 0.25 g 0.25 1.041
Distilled water 1000.00 ml - -
1 Prepare the medium without the yeast extract, peptone and sodium sulphide. Boil the medium and cool under nitrogen. Adjust the pH to 6.8. Dispense into hungate tubes or serum bottles under a nitrogen atmosphere. Sterilise the medium at 100°C for 3 hours on 3 consecutive days. Add the peptone and yeast extract from sterile (10% w/v) stock solutions. The medium is reduced by adding a sterile, neutralised 5% w/v sodium sulphide solution to an end concentration of 0.025%. Final pH should be 6.8
990 YPS MEDIUM