No ‘nanofossils’ in martian meteorite
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Structures in ALH84001 that resembled fossilized bacteria can be produced as an artifact of techniques used to prepare mineral samples for electron microscopy.
“For example, one of the “biosignatures” cited by McKay et al. were structures in the meteorite that appeared to resemble fossilized bacteria when viewed under an electron microscope, but later work showed that similar structures can be produced as an artifact of the techniques used to prepare mineral samples for electron microscopy (Bradley et al., 1997).”
From The Astrobiology Primer v2.0 (2016) · cites this paper as Bradley et al., 1997
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Microbes produce nanobacteria-like structures, avoiding cell entombment
Bontognali, T. R. R., Vasconcelos, C., Warthmann, R. J., Dupraz, C., Bernasconi, S. M., & McKenzie, J. A. (2008) · Geology · doi:10.1130/g24755a.1 · Cited by 198 · see citing works
Domagal-Goldman, S. D., Wright, K. E., Domagal-Goldman, S. D., Wright, K. E., Adamala, K., Arina de la Rubia, L., Bond, J., Dartnell, L. R., Goldman, A. D., Lynch, K., et al. (2016) · Astrobiology · doi:10.1089/ast.2015.1460 · Cited by 136 · see citing works
“As a result, we now know that abiological processes could have created these signals, and the meteorite is not therefore widely considered proof of life beyond Earth (Bradley et al., 1996, 1997; Frankel and Buseck, 2000; Buseck et al., 2001; McKay et al., 2003; Treiman, 2003).”
Sánchez‐Román, M., Vasconcelos, C., Warthmann, R., Rivadeneyra, M., & McKenzie, J. A. (2009) · Perspectives in Carbonate Geology · doi:10.1002/9781444312065.ch11 · Cited by 94 · see citing works
- Authors
- Bradley, J. P., Harvey, R. P., McSween, H. Y., Gibson, E., Thomas-Keprta, K., & Vali, H.
- Affiliations
- Georgia Institute of Technology (US)
- Case Western Reserve University (US)
- Johnson Space Center (US)
- Lockheed Martin (United States) (US)
- McGill University (CA)
- Venue
- Nature
- Published
- 1997-12-04
- Volume
- 390
- Issue
- 6659
- Pages
- 454-455
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W1594606049
- Cited by
- 143
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 21 · 2019: 3 · 2018: 22 · 2017: 2 · 2016: 3 · 2014: 1 · 2013: 1 · 2012: 4
- FWCI
- 7.17
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- ALH84001, Martian meteorites, Martian life, pyroxene, carbonates, fracture morphology
- MeSH terms
- Carbonates, Crystallography, Fossils, Microscopy, Electron, Minerals, Mars, Meteoroids
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