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A round-spore-forming Bacillus species that produces an exosporium was isolated from the …


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- Bacillus odysseyi sp. nov., a round-spore-forming bacillus isolated from the Mars Odyssey spacecraft

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Fig. 1. Microscopic images of Bacillus odysseyi sp. nov. 34hs-1T. (a) Light microscopy image of sporulating vegetative cells showing terminal swelling of mother cells; bar, 5 µm. (b)–(f) Field-emission environmental SEM [b (bar, 5 µm); d (bar, 2 µm); e (bar, 1 µm)] and TEM (c, f; bars, 1 µm) micrographs of spores showing the spore surface and cross-section characteristics, respectively. (b, c) Purified spores showing intact round structure; IS, intact spore with exosporium. In (c), the exosporium (EX), spore coat (SC), cortex and spore core are shown in longitudinal section. Spores (1·1x107) were exposed to 0·5 Mrad gamma radiation (d) and 5 % liquid H2O2 for 60 min (e, f). The exosporium removed from the spore due to gamma radiation and H2O2 treatment is shown in (d) and (e). An electron-dense region of a H2O2-treated spore is shown in (f).

figure 1

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Fig. 2. Phylogenetic tree of round-spore-forming Bacillus and other species closely related to strain 34hs-1T based on maximum-parsimony analysis of 16S rDNA nucleotide sequences. Strain numbers and GenBank accession numbers are shown. Numbers above lines are percentage bootstrap values of 500 replications of that branch of the tree. Bar, 10 changes.

figure 2

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