ИСТИНА

Halomonas sp. Н12b and Halorubrum sp. Н13a strains are the most resistant to wide range of extreme factors. Survival of studied halophiles at low NaClO4 content show that presence of perchlorates in small amounts cannot be a limiting factor for survival of Earth’s extremophiles at the subsurface layers of Martian regolith. Smaller decrease of survival of several strains during second freeze-thaw cycle may be interpreted as possible evidence of existence of strains which are able to grow after multiple freeze-thaw cycles at -70 oC typical for Martian nights. Experiments with survival at different cooling temperatures show that partly frozen solutions are not optimal for survival of microbes. Additional checking of this conclusion is possible by performing of planned experiments with solutions having lower eutectic temperatures.