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[Mathematical models of various exobiological situations].

To analyze quarantine and sterilization requirements of space flights, the possibility of coexistence of terrestrial and aboriginal forms of life was theoretically explored. It was found that if the trophic chain with the terrestrial form acting as a consumer evolves both forms may coexist. Their quantitative relations can be explained by a good number of hypotheses. The study of spatial distribution and diffusion suggests wave-like processes similar to the distribution of autocatalytic reactions in chemical kinetics.