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Kinetics for B. subtilis endospores inoculated on glass petri-dishes for (A) pure argon with (△) inactivation and (
)endospore DNA damage ratio, (B) argon + 0.135% vol. oxygen with (
) inactivation and (
)endospore DNA damage ratio, (C) argon + 0.135% vol. oxygen + 0.2% vol. nitrogen with (
) inactivation and (
) endospore DNA damage ratio. Solid lines represent the biphasic fit for the DNA damage and the dashed lines for endospore inactivation.
