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

Barbier, B ; Bertrand, M ; Boillot, F ; Chabin, A ; Chaput, D ; Henin, O ; Brack, A

Delivery of extraterrestrial amino acids to the primitive Earth. Exposure experiments in Earth orbit.

Biol Sci Space 12 (2) 92-5

par Administrateur - publié le

Abstract :

A large collection of micrometeorites has been recently extracted from Antarctic old blue ice. In the 50 to 100 micrometers size range, the carbonaceous micrometeorites represent 80% of the samples and contain 2% of carbon. They might have brought more carbon to the surface of the primitive Earth than that involved in the present surficial biomass. Amino acids such as "-amino isobutyric acid have been identified in these Antarctic micrometeorites. Enantiomeric excesses of L-amino acids have been detected in the Murchison meteorite. A large fraction of homochiral amino acids might have been delivered to the primitive Earth via meteorites and micrometeorites.