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J G Lawless
K K Ghosh and S tf Ghosh
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absorber abundant Acad adsorption amino acids anaerobic archaebacteria atmosphere atoms bacteria biological calculated carbon carbonaceous chondrites cells chemical evolution chemistry chernozem clay clouds CM CM CM cometary nuclei comets compounds concentration culture cyanophytes damage decrease Delsemme desert soil dose electron energy spectra environments ether lipids experimental experiments flux formation fossil fruiting bodies glycine growth hadrons heavy ions hydrogen increase interaction interstellar interstellar clouds ionizing irradiation isomers isoprenoid late effects LDEF LET spectra lignin limonite lipids mechanism medium metabolic meteorites methanogens microbial microorganisms molecules monocarboxylic acids Murchison mutation nebula nucleotides nutrient observed ocean orbits organic oxygen particles peroxide photosynthetic planetary planets plasmalemma Ponnamperuma prebiotic Precambrian present primitive Earth processes radiation rads reactions recombination reduced Salyut samples Sciences and Space sediments solar nebula solar system Space Research Stromatolites structures surface synthesis Table temperature tissue ultraviolet values