Growth of permafrost isolates (A) and Carnobacterium spp. type strains (B) after 28 d of incubation on TSBYS plates at 0 °C and the following conditions: Earth atmosphere and pressure (open bars); simulated Mars atmosphere and Earth pressure (shaded bars); and simulated Mars atmosphere and pressure (black bars). Generations were calculated as described in Materials and Methods. Data shown are averages and SDs of triplicate determinations. Lowercase letters denote significant differences compared with the Earth control of each strain (ANOVA, P ≤ 0.05). Cga, C. gallinarum; Cmo, C. mobile; Cin, C. inhibens; Cvi, C. viridans; Cma, C. maltaromaticum; Cdi, C. divergens; Cfu, C. funditum; Cal, C. alterfunditum; Cpl, C. pleistocenium; Sli, Serratia liquefaciens.