[Results of the experiment with extended exposure of microorganisms in open space].

Purpose of the experiment was to define the hypothesized margins of phenotype adaptation and genotype modifications of bacteria-fungi associations that form the typical microbiota on space vehicle materials. The fundamental questions to answer were whether the selected test-cultures would remain vital after extended (comparable to the Mars mission duration) exposure in open space as part of microbesstructural material model systems, and how the space factors would affect microorganisms in the context of eco-safety of space vehicles and planetary quarantine precautions. The first extended (1.5 years) exposure of the model systems outside of the International space station proved survivability of bacterial and microfungal spores in open space. Ultrastructures of eukaryotic and prokaryotic organisms were found altered, and so were their biological properties.