Table 2.

Biolog PM-measured parameter estimates and goodness-of-fit values for inverse and quadratic relations between TTDL and normalized oxidative activity on various substrates

Carbon source	Relation
	Inversea				Quadraticb
	Constant	a	P	R2	Constant	a	b	P	R2
α-Ketobutyric acid	232.70	−40.66	<0.001	0.72	47.25	140.51	−25.15	<0.001	0.86
α-Hydroxybutyric acid	238.92	−76.88	<0.001	0.67	15.04	139.58	−21.79	<0.001	0.82
Propionic acid	218.75	−53.61	<0.001	0.65	22.51	129.07	−19.85	<0.001	0.78

^aSurvival time (TTDL in days) = constant − (a/substrate), where “substrate” is the observed normalized oxidative activity.

^bSurvival time (TTDL in days) = constant + (b · substrate) + (b · substrate)², where “substrate” is the observed normalized oxidative activity.