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  • Lipid biomarkers in sediments are widely used to infer environmental conditions that have occurred in the geological past, but these reconstructions require a careful consideration of the biotic and abiotic processes that degrade and alter the lipid biomarker compositions before and after deposition. In this paper, we use alkenones produced by haptophyte microalgae to explore the range of effects of these degradative processes. Alkenones are now perhaps the best studied of all biomarkers with several hundred papers on their occurrence in organisms, seawater and sediments. Much information has been obtained on their degradation from laboratory incubations and inferences from changes in their distribution in aquatic environments. Although alkenones are often considered as more stable than many other lipid classes, it is now clear that their distributions can be affected by processes such as prolonged oxygen exposure, aerobic bacterial degradation and thiyl radical-induced stereomutation processes which, in some cases, can lead to changes in the proportions of the alkenones used in the U₃₇[superscript K′] temperature proxy. The same set of chemical and biological processes act on all lipids in aquatic environments and, in cases where there is a marked difference in reactivity, this may lead to significant changes in the biomarker distributions and relative proportions of different lipid classes.
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2013-07-31T21:35:23Z No. of bitstreams: 16 PrahlFredrickCEOASBioticAbioticDegradation.pdf: 410690 bytes, checksum: 36a69ccdec6cf75a0e0e1d150f28b083 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure1.pdf: 25199 bytes, checksum: c526c02483b32dac3586e5d3d77df327 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure2.pdf: 16788 bytes, checksum: 5238012ba1b2175ea96570005b33c40a (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure3.pdf: 99379 bytes, checksum: aa07e6e484b410e5e8e9bd9527b6d085 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure4.pdf: 15035 bytes, checksum: 64bf0df62bdb502e2e0ccf0d7a1cd641 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure5.pdf: 65626 bytes, checksum: e985e965a8064584585b0cb78e2df988 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure6.pdf: 52119 bytes, checksum: 6f70b226201be4ef6ea0b0be7b467157 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure7.pdf: 76147 bytes, checksum: 2840f58242c87dd0fe4d4614daed0543 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure8.pdf: 66633 bytes, checksum: 5f4715d92ec8e4deb7a873d8d0efa4ba (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure9.pdf: 68014 bytes, checksum: 986bb9f30dddd83633b133ab8ac0318b (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure10.pdf: 14552 bytes, checksum: c61f0db7e62cbeec5b467646c16a7b2b (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure11.pdf: 89310 bytes, checksum: 5397d8a8bffe0c7742aa1f1b49ff9a84 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure12.pdf: 28365 bytes, checksum: 5ae7868443c0108c49b813ac23e700ff (MD5) PrahlFredrickCEOASBioticAbioticDegradationTable1.pdf: 18430 bytes, checksum: 3680618b58b836813a092d34c8dbcd96 (MD5) PrahlFredrickCEOASBioticAbioticDegradationTable2.pdf: 99101 bytes, checksum: 9327705937ffd54e1d0877a8ededbc19 (MD5) PrahlFredrickCEOASBioticAbioticDegradationTable3.pdf: 88045 bytes, checksum: 494a51c904b3a3b042d2b6159c3c7efd (MD5)
  • description.provenance : Made available in DSpace on 2013-07-31T21:35:23Z (GMT). No. of bitstreams: 16 PrahlFredrickCEOASBioticAbioticDegradation.pdf: 410690 bytes, checksum: 36a69ccdec6cf75a0e0e1d150f28b083 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure1.pdf: 25199 bytes, checksum: c526c02483b32dac3586e5d3d77df327 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure2.pdf: 16788 bytes, checksum: 5238012ba1b2175ea96570005b33c40a (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure3.pdf: 99379 bytes, checksum: aa07e6e484b410e5e8e9bd9527b6d085 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure4.pdf: 15035 bytes, checksum: 64bf0df62bdb502e2e0ccf0d7a1cd641 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure5.pdf: 65626 bytes, checksum: e985e965a8064584585b0cb78e2df988 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure6.pdf: 52119 bytes, checksum: 6f70b226201be4ef6ea0b0be7b467157 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure7.pdf: 76147 bytes, checksum: 2840f58242c87dd0fe4d4614daed0543 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure8.pdf: 66633 bytes, checksum: 5f4715d92ec8e4deb7a873d8d0efa4ba (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure9.pdf: 68014 bytes, checksum: 986bb9f30dddd83633b133ab8ac0318b (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure10.pdf: 14552 bytes, checksum: c61f0db7e62cbeec5b467646c16a7b2b (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure11.pdf: 89310 bytes, checksum: 5397d8a8bffe0c7742aa1f1b49ff9a84 (MD5) PrahlFredrickCEOASBioticAbioticDegradationFigure12.pdf: 28365 bytes, checksum: 5ae7868443c0108c49b813ac23e700ff (MD5) PrahlFredrickCEOASBioticAbioticDegradationTable1.pdf: 18430 bytes, checksum: 3680618b58b836813a092d34c8dbcd96 (MD5) PrahlFredrickCEOASBioticAbioticDegradationTable2.pdf: 99101 bytes, checksum: 9327705937ffd54e1d0877a8ededbc19 (MD5) PrahlFredrickCEOASBioticAbioticDegradationTable3.pdf: 88045 bytes, checksum: 494a51c904b3a3b042d2b6159c3c7efd (MD5) Previous issue date: 2013-06

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