# 641: DESULFOVIBRIO (MV) MEDIUM


## Main sol. 641

1	g	NH4Cl	
2	g	Na2SO4	
1	g	Na2S2O3 x 5 H2O	
1	g	MgSO4 x 7 H2O	
0.1	g	CaCl2 x 2 H2O	
0.5	g	KH2PO4	
1	ml	**Trace element solution SL-10**	
1	ml	**Selenite-tungstate solution**	
1	g	Yeast extract	
0.5	ml	Sodium resazurin (0.1% w/v)	
1	g	Na2CO3	
2.5	g	Na-DL-lactate	
1	ml	**Wolin's vitamin solution (10x)**	
0.1	g	Na2S x 9 H2O	
1000	ml	Distilled water	

1. Dissolve ingredients (except carbonate, vitamins, lactate and sulfide), sparge medium with 100% N2 gas for 30 - 45 min to make it anoxic, then dispense under same gas atmosphere into anoxic Hungate-type tubes or serum vials and autoclave. After autoclaving complete the medium by adding vitamins (sterilized by filtration), lactate and sulfide from sterile anoxic stock solutions prepared under 100% N2 gas and carbonate from a sterile anoxic stock solution prepared under 80% N2 and 20% CO2 gas atmosphere. Adjust pH of the complete medium to 7.0 - 7.2, if necessary.
2. Note: Prior to inoculation 10-20 mg/l sodium dithionite (added from a 5% w/v solution freshly prepared under N2 and filter-sterilized) can be added to the medium to stimulate growth at the beginning.


## Trace element solution SL-10

10	ml	HCl (25%)	
1.5	g	FeCl2 x 4 H2O	
70	mg	ZnCl2	
100	mg	MnCl2 x 4 H2O	
6	mg	H3BO3	
190	mg	CoCl2 x 6 H2O	
2	mg	CuCl2 x 2 H2O	
24	mg	NiCl2 x 6 H2O	
36	mg	Na2MoO4 x 2 H2O	
990	ml	Distilled water	

1. First dissolve FeCl2 in the HCl, then dilute in water, add and dissolve the other salts. Finally make up to 1000.00 ml.


## Selenite-tungstate solution

0.5	g	NaOH	
3	mg	Na2SeO3 x 5 H2O	
4	mg	Na2WO4 x 2 H2O	
1000	ml	Distilled water	


## Wolin's vitamin solution (10x)

20	mg	Biotin	
20	mg	Folic acid	
100	mg	Pyridoxine hydrochloride	
50	mg	Thiamine HCl	
50	mg	Riboflavin	
50	mg	Nicotinic acid	
50	mg	Calcium D-(+)-pantothenate	
1	mg	Vitamin B12	
50	mg	p-Aminobenzoic acid	
50	mg	(DL)-alpha-Lipoic acid	
1000	ml	Distilled water