Table 2.

The percentage of CFU of B. subtilis spores relative to the starting concentration following exposure to PBS, inactivated basalt and basalt for 24 h.

Strain	Gene deficiency	Spore deficiency	% CFU after 24 h
			PBS	Inactivated basalt	Basalt
PE594 (wt)	none	none	82 ± 7	76 ± 3	73 ± 5
PE620	cotX, cotYZ	Crust	113 ± 8	64 ± 4	64 ± 2
PE618	cotE	Outer coat	75 ± 7	92 ± 5	97 ± 5
PE277	safA	Inner coat	55 ± 3	75 ± 2	59 ± 7
PE1720	cotE, safA	Inner and outer spore coat	82 ± 2	113 ± 4	63 ± 5
PS832 (wt)	none	none	111 ± 5	73 ± 2	87 ± 17
PS356	sspA sspB	Major α- and β-type SASP	36 ± 11	25 ± 4	40 ± 2

The basalt was kept anoxic. The results are the average of three replicates ± SEM. PE594 is the wild-type of the other PE strains while PS832 is the wild-type of the PS356 strain.