TABLE 1.

Total protein determined during Fe reduction assays

Form of Fe	Cell density (cells/ml)	Amt of protein (mg/ml) at:
		0 h	48 h	72 h
Fe-beads	6.7 × 108	0.301 ± 0.010	0.242 ± 0.009	0.186 ± 0.022
	6.7 × 107	0.023 ± 0.001	0.021 ± 0.003	0.015 ± 0.002
Fe(III) (hydr)oxide	6.7 × 108	0.303 ± 0.006	0.270 ± 0.011	0.293 ± 0.021
	6.7 × 107	0.029 ± 0.001	0.029 ± 0.001	0.027 ± 0.001