[Influence of chronic exposure to low doses of space ionizing radiation on the character of formation of microbial assemblage in the habitat of orbital station].
Statistically valid relations between radiation conditions in compartments of MIR station and the micromicete population (CFU number) on the surface of the equipment and the interior have been established. It was found that in conditions of a chronic exposure to space radiation the number of CFU increased in one thousand and more times with increasing of absorbed dose rate from 200 up to 1000 microGy/day. The results of land-based model experiments confirmed morphological changes in the "flight" strains of funguses under exposure to low doses of gamma (100-800 microGy/day) and neutron (0.2-2 neutron/cm2.s) radiation. It was found that the morphological changes in the control (museum) cultures of funguses of the same species, which were expressed in the weak increase of vegetative mycelium, were detected only after repeated gamma- and gamma + neutron irradiation.
Tsetlin
V V
VV
State Research Centre of Russian Federation-Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, 123007 Russia. tsetlin@imbp.ru
Deshevaia
E A
EA
D003359:Cosmic Radiation; D005118:Extraterrestrial Environment; D005658:Fungi / Q000254:growth & development / Q000528:radiation effects*; D005720:Gamma Rays; D006801:Humans; D025282:Mycelium / Q000254:growth & development / Q000528:radiation effects; D009502:Neutrons; D011829:Radiation Dosage; D019445:Solar Activity; D013026:Space Flight; D018531:Spacecraft; D013234:Stem Cells; D013997:Time Factors