TABLE 3.

Heat resistance of B. subtilis strains^a

Strain	Enzyme deficiency	Cell titer (CFU/ml)b	Spore titer (CFU/ml)c	Sporulation efficiency (%)d
1A1	None (parental strain)	1.3 × 108	5.5 × 107	42
LMM24	TrxA	6.2 × 107	<1 × 102	<0.0002
LMM241	TrxA	6.7 × 107	2 × 102	<0.0003
LMM82	TrxA BdbD	1.2 × 106	2.8 × 105	23

^aData indicate the heat resistance of B. subtilis strains grown for sporulation in NSMP supplemented with deoxyribonucleosides, cysteine, and methionine.

^bCell titer values are CFU/ml before treatment.

^cSpore titers are CFU/ml after heat treatment.

^dSporulation efficiency was calculated as the spore titer divided by the cell titer.