TABLE 1.

Prepulsing with a low H₂O₂ concentration increases the survival rates of various S. oligofermentans strains in the presence of a higher H₂O₂ concentration

Culture	Survival rate (%)a
	Wild-type strain	Δpox Δlox mutant	ΔmntR mutant	ΔperR mutant
Static culture	30 ± 3.27*	0.02 ± 0.01*	ND	ND
Anaerobic culture
Nonprepulse	0.21 ± 0.07	0.23 ± 0.06	7.94 ± 3.18	75 ± 11
Prepulse with 40 μM H2O2	77 ± 33	66 ± 12	62 ± 26	86 ± 14
Prepulse with 100 μM H2O2	46 ± 4	ND	ND	ND

^aStrains were grown anaerobically in a 6-ml BHI culture, and then the survival percentages in 10 mM H₂O₂ were determined for all strains except for strains labeled with an asterisk, which were statically grown in a 40-ml culture and challenged with 20 mM H₂O₂. The survival percentage was calculated by dividing the number of CFU in the H₂O₂-treated culture by that in the untreated culture. The experiments were repeated three times with triplicate batch cultures each time. The results are averages ± SD from three independent experiments. ND, not determined.