# 760: MARINE THERMOCOCCUS MEDIUM


## Main sol. 760

1000	ml	**Main sol. 514**	

1. Prepare liquid Bacto Marine Broth (see medium 514) and filter through normal filter paper. An iron sediment will collect in the filter. Boil the medium in a water bath and cool under an anaerobic gas mixture (see strain dependant modifications).
2. Dispense the medium into Hungate tubes or serum bottles containing finely divided sulphur (0.5% w/v), seal the tubes or bottles under the same anaerobic gas used when cooling the medium. Sterilise the medium at 100°C for 3 hours on 3 consecutive days. Reduce the medium by adding 10% neutralised sodium sulphide to a final concentration of 0.05 %. The medium should not give a heavy black precipitate, if it does the iron sediment was not adequately removed by filtering in the initial stages and the medium should be made again, making sure that the iron is removed by filtering.


## Main sol. 514

5	g	Bacto peptone	
1	g	Yeast extract (Bacto )	
0.1	g	Fe(III) citrate	
19.45	g	NaCl	
5.9	g	MgCl2 (anhydrous)	
3.24	g	Na2SO4	
1.8	g	CaCl2	
0.55	g	KCl	
0.16	g	NaHCO3	
0.08	g	KBr	
34	mg	SrCl2	
22	mg	H3BO3	
4	mg	Na-silicate	
2.4	mg	NaF	
1.6	mg	(NH4)NO3	
8	mg	Na2HPO4	
1000	ml	Distilled water	

1. Final pH should be 7.6 ± 0.2 at 25°C. If using the complete medium from Difco add 37.40 g to 1 litre water.