TABLE 1.

Flavin production in rich medium by various Shewanella species^a

Strain	Flavin concn. measured as:
	μM (in culture)	μmol/mg protein
S. oneidensis MR-1	1.31 ± 0.20	2.8 ± 0.4
S. frigidimarina NCIMB 400	1.01 ± 0.10	2.4 ± 0.2
S. loihica PV-4	1.05 ± 0.16	5.3 ± 0.8
S. baltica OS155	0.56 ± 0.04	2.8 ± 0.2
S. amazonensis SB2B	0.87 ± 0.28	1.9 ± 0.6
S. denitrificans OS217T	0.54 ± 0.03	3.0 ± 0.2

^aStrains were grown for 16 h aerobically, and supernatant fluorescence was quantified to determine total flavin excreted. PV-4, OS155, NCIMB 400, and OS217T were grown for 30 h to reach optical densities similar to those of other strains.