title: The possibility of life in outer space.
abstract: Experiments were carried out dealing with the effect of extreme factors on microorganisms. Methods for microbiological analysis of meteorites were developed. The effect of temperature, from -20 degrees C to +15 degrees C, on trypsine activity was studied. It was shown that at about -3 degrees C a definite intramolecular reorganization occurs in the enzyme, leading to decreased activation energy. Previously reported resistance of microorganisms to high vacuum was confirmed. New species were tested at l0(-8)-10(-9) mm Hg. It was shown that very thin metal and metal oxide films, as well as films from other substances, may fully protect microorganisms from the hazardous effect of UV rays. By using an artificial climate, camera forms of microorganisms were selected which have the highest resistance to the whole complex of Martian climatic factors. Pigmented and spore-forming microorganisms resist UV up to a dose of 4.04 x 10(8) erg/cm2. There are microorganisms on Earth which show some activity in soil at a relative humidity of 0.096-0.196%. Preliminary data permit one to assume the possibility of existence of Earth-like forms on Mars. The majority of meteorites are accessible to Earth microorganisms. While choosing a meteorite for microbiological analysis it is necessary to consider the soil and climatic factors of the country where the latter has been found.
authors.affiliation: USSR Academy of Sciences, Moscow, USSR.
authors.forename: A A
authors.initials: AA
authors.lastname: Imshenetsky
authors.forename: S S
authors.initials: SS
authors.lastname: Abyzov
authors.forename: G T
authors.initials: GT
authors.lastname: Voronov
authors.forename: A I
authors.initials: AI
authors.lastname: Zhukova
authors.forename: S V
authors.initials: SV
authors.lastname: Lysenko
mesh_terms: D001407:Bacillus; D003081:Cold Climate; D056890:Eukaryota; D018559:Exobiology; D005118:Extraterrestrial Environment; D005658:Fungi; D018535:Mars; D019110:Meteoroids; D008837:Micrococcus; D012988:Soil Microbiology; D014357:Trypsin / Q000737:chemistry*; D014618:Vacuum; D015003:Yeasts
chemical_list: D014357:Trypsin