mars pressure 2
Figure from the PNAS paper by Nicholson et al. shows growth of Carnobacterium isolates. Plate A shows growth with freezing temperatures and Earth pressure and atmosphere. Plate B shows growth with freezing temperatures, low oxygen and Earth pressure. Plate C shows growth with freezing temperatures, low pressure and low oxygen. Plate D shows the same plate as in C, but after one additional day of incubation on the laboratory bench (i.e., at room temperature, Earth atmospheric composition and pressure).
The results could help scientists protect Mars from contamination by Earth bacteria during spacecraft missions, as well as aid in the search for life on that planet.