TABLE 1.

Compositions of media^a

Component	Concn (μmol/liter = μM) in ddH2Oa
	MMS-2 medium	MSVP-2 medium
CaCl2·2H2O	200	400
MgSO4·7H2O	140	240
(NH4)2·SO4	910	1,820
KNO3	150
NaHCO3	10
KH2PO4	50	142.86
FeSO4·7H2O	0.1 or 0.2	10
Na pyruvate	2,900 or 5,800	9,090
Biotin	0.02	0.01
Vitamin B12	0.0015	0.00075
HEPES	2,900	10,000
Na2HPO4		211

^addH₂O, distilled deionized water.