491. ARCHAEGLOBUS NEPTUNUS MEDIUM (ARCNM)

NH₄Cl 0.33 g

KCl 0.33 g

CaCl₂ x 6 H₂O 0.33 g

KH₂PO₄ 0.33 g

NaCl 18.0 g

MgCl₂ x 6 H₂O 4.33 g

NaHCO₃ 2.0 g

Resazurin 0.001 g

Na₂S x 9 H₂O 0.5 g

Trace element solution (see below) 1 ml

Vitamin solution (see below) 1 ml

Distilled water 1000 ml

Trace element solution:

(NH₄)₂Fe(SO₄)₂ x 6 H₂O (Mohr's salt) 784.0 mg

HCl (concentrated) 5.0 ml

CoCl₂ x H₂O 238.0 mg

(NH₄)₂Ni(SO₄)₂ x 6 H₂O 395.0 mg

Na₂MoO₄ x 2 H₂O 24.0 mg

Na₂WO₄ x 2 H₂O 33.0 mg

ZnSO₄ x 7 H₂O 144.0 mg

CuCl₂ x 2 H₂O 2.0 mg

Na₂SeO₄ 94.0 mg

H₃BO₃ 6.0 mg

MnCl₂ x 4 H₂O 99.0 mg

Distilled water 995.0 ml

Mohr's salt is dissolved firstly in concentrated HCl and mixed with distilled water and other salts are dissolved in the sequence indicated.

Vitamin solution:

Biotin 20.0 mg

Folic acid 20.0 mg

Pyridoxine 0.1 mg

Riboflavin 50.0 mg

Pantotenoic acid 50.0 mg

p-Aminobenzoic acid 50.0 mg

Thiamine-HCl 50.0 mg

Nicotinic acid 50.0 mg

Vitamin B₁₂ 1.0 mg

Lipoic acid 50.0 mg

Distilled water 1000.0 ml

The medium had a pH of 6.5–6.8 (measured at 25°C). The medium was dispensed in 10 ml portions into 17 ml Hungate tubes and heat-sterilized at 121°C for 30 min; the gas phase consisted of H₂/CO₂ (20 : 80 v/v). Sodium sulfite from a sterile anoxic stock solution was added as an electron acceptor to a final concentration of 5 mM.

Updated: 08.01.2024