# 861a: DESULFOTALEA PSYCHROPHILA MEDIUM


## Main sol. 861a

952	ml	**Solution A**	
30	ml	**Solution B**	
10	ml	**Solution C**	
1	ml	**Solution D**	
10	ml	**Solution E**	
1	ml	**Solution F**	

1. Solution A is sparged with 80% N2 and 20% CO2 gas mixture to reach a pH below 6 (at least 30 – 45 min), then dispensed under the same gas atmosphere into serum vials (use at least bottles of 50 ml volume filled with 30 ml medium) and autoclaved. Solutions B and F are prepared under 80% N2 and 20% CO2 gas atmosphere and sterilized. Sterile solutions C, D and E are prepared under 100% N2 gas. Solutions D and F are sterilized by filtration. To complete the medium appropriate amounts of solutions B to F are added to the sterile solution A in the sequence as indicated. Final pH of the medium should be 7.0 - 7.2.
2. Note: For transfer of cultures use at least 10% (v/v) inoculum.


## Solution A

10	g	NaCl	
4	g	Na2SO4	
0.2	g	KH2PO4	
0.25	g	NH4Cl	
3	g	MgCl2 x 6 H2O	
0.15	g	CaCl2 x 2 H2O	
0.09	g	KBr	
0.5	g	KCl	
1	ml	**Trace element solution SL-10**	
1	ml	**Selenite-tungstate solution**	
0.5	ml	Sodium resazurin (0.1% w/v)	
940	ml	Distilled water	


## Solution B

1.5	g	Na2CO3	
30	ml	Distilled water	


## Solution C

2.5	g	Na-DL-lactate	
10	ml	Distilled water	


## Solution D

1	ml	**Wolin's vitamin solution (10x)**	


## Solution E

0.3	g	Na2S x 9 H2O	
10	ml	Distilled water	


## Solution F

1	ml	**Na-dithionite solution (5% w/v)**	


## 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	


## Na-dithionite solution (5% w/v)

1	ml	NaOH (1 N)	
0.5	g	Na2S2O4	
9	ml	Distilled water	

1. Add 1 N NaOH to distilled water and make the solution anoxic by sparging with 100% N2 gas. Then dissolve the Na-dithionite and filter sterilize the solution into anoxic Hungate tubes. Store the prepared solution in a dark and cool place. Prepare only small amounts of stock solution, as Na-dithionite decomposes rapidly.