Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12567b&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12567
Computer Science
Scientific paper
Nannobacteria-like objects evidenced at the surface of the orthopyroxenes of the Tatahouine meteorite have been studied by scanning and transmission electron microscopies. These objects developped at the surface of the meteoritic pyroxene during its seventy years of residence in the aridic Tataouine soil (Tunisia). A method of micromanipulation has been developed to ensure that exactly the same objects were studied by both scanning and transmission electron microscopies. We show that the nannobacteria-like small rods are well-crystallized calcite single crystals surrounded by a thin amorphous layer of carbonate composition which smoothes the crystal edges and induces rounded shapes. Those morphologies are unusual for calcite single crystals. We discuss this observation in regard to the different criteria of biogenicity (biosignatures), which were advanced for the existence of nannobateria.
Benzerara Karim
Gillet Philippe
Guyot Francois
Menguy Nicolas
Saikaly W.
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