TABLE 1.

Reductase activities in the crude extracts of strain SCT^a

Substrate	Electron donor	Growth with IO3−	Growth without IO3−
Iodate	MV	0.308 ± 0.043	<0.010
	BV	0.161 ± 0.024	<0.010
	NADH	<0.030	<0.030
	NADPH	<0.030	<0.030
Nitrate	MV	4.12 ± 0.249	4.17 ± 0.041
	BV	1.92 ± 0.106	2.33 ± 0.054
	NADH	0.080 ± 0.014	0.081 ± 0.006
	NADPH	<0.030	<0.030
Chlorate	MV	17.2	19.8
Perchlorate	MV	0.588	0.412
Periodate	MV	0.289	<0.010
Bromate	MV	<0.010	<0.010

^aIodate and nitrate reductase activities are expressed as the means of specific activity (micromoles of electron donors oxidized per minute per milligram of protein) ± standard deviations of the data from at least three determinations. Other reductase activities are expressed as the means of specific activity data from duplicate determinations.