| Preservation of Microbial Lipids in Geothermal Sinters. | |
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MedLine Citation:
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PMID: 21476896 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Abstract Lipid biomarkers are widely used to study the earliest life on Earth and have been invoked as potential astrobiological markers, but few studies have assessed their survival and persistence in geothermal settings. Here, we investigate lipid preservation in active and inactive geothermal silica sinters, with ages of up to 900 years, from Champagne Pool, Waiotapu, New Zealand. Analyses revealed a wide range of bacterial biomarkers, including free and bound fatty acids, 1,2-di-O-alkylglycerols (diethers), and various hopanoids. Dominant archaeal lipids include archaeol and glycerol dialkyl glycerol tetraethers (GDGTs). The predominance of generally similar biomarker groups in all sinters suggests a stable microbial community throughout Champagne Pool's history and indicates that incorporated lipids can be well preserved. Moreover, subtle differences in lipid distributions suggest that past changes in environmental conditions can be elucidated. In this case, higher archaeol abundances relative to the bacterial diethers, a greater proportion of cyclic GDGTs, the high average chain length of the bacterial diethers, and greater concentrations of hopanoic acids in the older sinters all suggest hotter conditions at Champagne Pool in the past. Key Words: Extremophiles-Silica sinters-Lipid biomarkers-Archaeol-Bacterial diethers-Fatty acids. Astrobiology 11, 259-274. |
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Authors:
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Gurpreet Kaur; Bruce W Mountain; Ellen C Hopmans; Richard D Pancost |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-10 |
Journal Detail:
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Title: Astrobiology Volume: - ISSN: 1557-8070 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101088083 Medline TA: Astrobiology Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 Organic Geochemistry Unit, Bristol Biogeochemistry Research Centre, School of Chemistry, University of Bristol , Bristol, UK . |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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