TABLE 2.

μ_stressor/μ_{no stress} ratios of cultures exposed to SNP

Straina	μSNP/μno stressb
Control	0.68 ± 0.06
FHP	0.88 ± 0.02, a,c
VHb-Red	0.88 ± 0.05, a
HmpKp	0.84 ± 0.03, a
HmpPa	0.86 ± 0.04, a
HmpSt	0.89 ± 0.05, a
HmpBs	0.92 ± 0.06, a
HMP	0.90 ± 0.08, a
HmpDr	0.93 ± 0.02, a
FHPg	0.92 ± 0.02, a
VHb	0.91 ± 0.06, a
CHb	0.87 ± 0.07, a
HMPd	0.99 ± 0.08, a
VHbd	0.96 ± 0.06, a

^aStrains expressing various hemoglobins and flavohemoglobins in E. coli MG1655 cells. The control strain contained the parental plasmid pKQV4.

^bRatio of growth rate of a culture exposed to 1 mM SNP to that of a stressor-free control culture. Means and standard deviations are given. Values are calculated from the results of at least two independent experiments performed in triplicate.

^cFor statistical significance, data were analyzed by ANOVA (F = 24.25) and compared to data for the control culture by Dunnett's multiple comparison test (confidence interval, 99%). Different letters indicate significant differences (P ≤ 0.05).

^dCultures of E. coli MG1655::pPPC1 and MG1655::pECS14 grown in the presence of 1 mM K₄[Fe(CN)₆].