TABLE 3.

Iron-citrate and manganese-oxide reduction by S. loihica PV-4, S. oneidensis MR-1, and their derivatives

Strain	Manganese-oxide reduction		Iron-citrate reduction
	Rate (μmol liter−1 hr−1)a	Ratio to the wild type (%)	Rate (μmol liter−1 hr−1)a	Ratio to the wild type (%)
S. loihica
PV-4	100 ± 6.0	100	1,700 ± 66	100
Δ2525 mutant	34 ± 4.4	34	280 ± 4.0	17
Δ2525-p2525 mutant	74 ± 4.7	74	1,600 ± 35	99
Δ2525-pmtrC mutant	68 ± 15	68	1,500 ± 57	89
S. oneidensis
MR-1	95 ± 4.2	100	1,500 ± 49	100
ΔmtrC mutant	78 ± 5.5	82	570 ± 5.1	37

^aMean ± standard deviation (n = 3).