Chemo-organotrophic two species are facultative chemolithotrophs: prototrophs to auxotrophs requiring several growth factors.
A wide diversity of physiological abilities is exhibited, ranging from psychrophilic to thermophilic, and acidophilic to alkaliphilic some strains are salt tolerant and some are halophilic. Colony morphology and size very variable between and within species. Most species will grow on routine media such as nutrient agar and blood agar. The terminal electron acceptor is oxygen, replaceable by alternatives in some species. Aerobes or facultative anaerobes, but a few species are described as strictly anaerobic. Motile by means of peritrichous or degenerately peritrichous flagella, or nonmotile. A meso-DAP direct murein cross-linkage type is commonest, but L-Lys- D-Glu, Orn- D-Glu and L-Orn- D-Asp have occasionally been reported. Gram-positive, or Gram-positive only in early stages of growth, or Gram-negative. Endospores are formed, no more than one to a cell these spores are very resistant to many adverse conditions. Bacillus a rodlet.įirmicutes / “Bacilli” / Bacillales / Bacillaceae / BacillusĬells rod-shaped, straight or slightly curved, occurring singly and in pairs, some in chains, and occasionally as long filaments.
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