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. 2023 Sep 1;14:1219581. doi: 10.3389/fmicb.2023.1219581

Table 1.

Sporulation conditions.

Sporulation condition Description Consequence
Spo8 Control
Modifications of Spo8 from the beginning of the growth
-CaCl2 Spo8 without CaCl2 complementation Depletion in Ca2+ (Supplementary Figure 1A)
-MgSO4 Spo8 without MgSO4 complementation Depletion in Mg2+ (Supplementary Figure 1B)
Modifications of Spo8 during the stationary phase
-O2 The Erlenmeyer containing the bacterial culture was sealed with a rubber stopper Modified atmosphere (progressive decrease in the O2 availability)
-O2 + CO2 -O2 condition with the addition of 0.8% sodium bicarbonate Modified atmosphere (progressive decrease in the O2 availability and increased CO2 concentration) and increase of pH (Supplementary Figure 1C)
H2O2 Addition of 0.005% of H2O2 Oxidative stress
Peracetic acid Addition of 0.005% of peracetic acid Oxidative stress and decrease of pH (Supplementary Figure 1C)
pH 5 Acidification to pH 5 by the addition of HCl pH decrease
pH 9 Alkalinization to pH 9 by the addition of NaOH pH increase
Benzoic acid Addition of 0.05% C₆H₅CO₂H, a food preservative (E210) Antibacterial properties and decrease of pH (Supplementary Figure 1C)
Nitrites Addition of 0.05% NaNO2, a food preservative (E250) Antibacterial properties
RBS Addition of 0.05% RBS 25, an alkaline detergent Detergent effect without significant impact on pH (Supplementary Figure 1C)
BAC Addition of 0.00025% Benzalkonium chloride, a quaternary ammonium disinfectant Antibacterial properties
UV Ultraviolet treatment at 254 nm Antibacterial properties

This table summarizes the different sporulation conditions used in the study. Modifications of the sporulation conditions are made from the beginning of the growth or in the early stationary phase (2 h after the transition to the stationary phase). The concentrations in peracetic acid, H2O2, benzoic acid, nitrites, RBS, and BAC used in these experiments correspond to the maximum concentrations of each of these agents that did not decrease the total number of CFU after 5 days of growth.