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Structural variations in derivatives of the bacteriochlorophylls of Chlorobiaceae: impact of stratigraphic resolution on depth profiles as revealed by methanolysis

Wilson, Michael A.; Hodgson, Dominic A.; Keely, Brendan J.. 2004 Structural variations in derivatives of the bacteriochlorophylls of Chlorobiaceae: impact of stratigraphic resolution on depth profiles as revealed by methanolysis. Organic Geochemistry, 35 (11-12). 1299-1307. 10.1016/j.orggeochem.2004.05.011

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Abstract/Summary

Bacteriochlorophylls c and d, recovered from two sedimentary sequences, were converted to bacteriophaeophorbide methyl esters by methanolysis and analysed by atmospheric pressure chemical ionisation liquid chromatography-multi-stage mass spectrometry (APCI LC-MSn). The distributions in both settings, a moderately consolidated sediment from Kirisjes Pond, Antarctica, and in a finely laminated microbial mat from Les Salines de la Trinitat, Spain, show significant variations within a narrow depth interval. The overall bacteriophaeophorbide c to d ratios in the two sediments are different, as are the ratios of particular C-3(1) diastereoisomers, indicating distinct differences between the bacterial communities that contributed to each sediment. Furthermore, a shift towards more extensive alkylation in homologues within each sediment is consistent either with changing environmental conditions in the depositional environments, or development-related changes in the structure of the bacterial community, leading to increased competition for light or nutrients.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.orggeochem.2004.05.011
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Signals in Antarctica of Past Global Changes
ISSN: 0146-6380
NORA Subject Terms: Biology and Microbiology
Ecology and Environment
Earth Sciences
Date made live: 19 Mar 2012 09:15
URI: http://nora.nerc.ac.uk/id/eprint/12524

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