Exceptional preservation of palaeozoic steroids in a diagenetic continuum
MetadataShow full item record
This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by-nc-nd/3.0. Please refer to the licence to obtain terms for any further reuse or distribution of this work.
The occurrence of intact sterols has been restricted to immature Cretaceous (~125 Ma) sediments with one report from the Late Jurassic (~165 Ma). Here we report the oldest occurrence of intact sterols in a Crustacean fossil preserved for ca. 380 Ma within a Devonian concretion. The exceptional preservation of the biomass is attributed to microbially induced carbonate encapsulation, preventing full decomposition and transformation thus extending sterol occurrences in the geosphere by 250 Ma. A suite of diagenetic transformation products of sterols was also identified in the concretion, demonstrating the remarkable coexistence of biomolecules and geomolecules in the same sample. Most importantly the original biolipids were found to be the most abundant steroids in the sample. We attribute the coexistence of steroids in a diagenetic continuum-ranging from stenols to triaromatic steroids-to microbially mediated eogenetic processes.
Showing items related by title, author, creator and subject.
Tapping the archives: The sterol composition of marine sponge species, as determined non-invasively from museum-preserved specimens, reveals biogeographical featuresLengger, S.; Fromont, J.; Grice, Kliti (2016)Over 8600 species are currently recorded in the phylum Porifera (sponges). They produce a large diversity of biochemical compounds including sterols, with more than 250 different sterols identified. Some of these sterols ...
Hughes, Zak; Mancera, Ricardo (2013)ell membrane phospholipid bilayers can be damaged by the large amounts of dimethyl sulphoxide (DMSO) commonly used in cryopreservation. The interaction of DMSO with model bilayers consisting of 1,2-dioleoyl-sn-glycero-3 ...
Maycock, Bruce; Howat, Peter (2005)This paper summarizes the self-reported barriers that men overcame prior to initiating illegal anabolic steroid use, and the associated weakening of social controls that restrict anabolic steroid initiation. Data was ...