Nanobacteria-like calcite single crystals at the surface of the Tataouine meteorite.

Abstract:

:Nanobacteria-like objects evidenced at the surface of the orthopyroxenes of the Tataouine meteorite in South Tunisia have been studied by scanning and transmission electron microscopies. A method of micromanipulation has been developed to ensure that exactly the same objects were studied by both methods. We have shown that the nanobacteria-like objects are spatially correlated with filaments of microorganisms that colonized the surface of the meteoritic pyroxene during its 70 years of residence in the aridic Tataouine soil. Depressions of a few micrometers in depth are observed in the pyroxene below the carbonates, indicating preferential dissolution of the pyroxene and calcite precipitation at these locations. The nanobacteria-like small rods that constitute calcium carbonate rosettes are well crystallized calcite single crystals surrounded by a thin amorphous layer of carbonate composition that smoothes the crystal edges and induces rounded shapes. Those morphologies are unusual for calcite single crystals observed in natural samples. A survey of recent literature suggests that the intervention of organic compounds derived from biological activity is likely in their formation.

authors

Benzerara K,Menguy N,Guyot F,Dominici C,Gillet P

doi

10.1073/pnas.0832464100

keywords:

subject

Has Abstract

pub_date

2003-06-24 00:00:00

pages

7438-42

issue

13

eissn

0027-8424

issn

1091-6490

pii

0832464100

journal_volume

100

pub_type

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