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Accueil > Publications > Recherche par années > Années 1990 > 1998

Brack, A ; Pillinger, CT

Life on Mars : chemical arguments and clues from Martian meteorites

Extremophiles 2 (3) 313-319

par Administrateur - publié le

Abstract :

Primitive terrestrial life - defined as a chemical system able to transfer its molecular information via self-replication and to evolve - probably originated from the evolution of reduced organic molecules in liquid water. Several sources have been proposed for the prebiotic organic molecules : terrestrial primitive atmosphere (methane or carbon dioxide), deep-sea hydrothermal systems, and extraterrestrial meteoritic and cometary dust grains. The study of carbonaceous chondrites, which contain up to 5% by weight of organic matter, has allowed close examination of the delivery of extraterrestrial organic material. Eight proteinaceous amino acids have been identified in the Murchison meteorite among more than 70 amino acids.