| 000 | 02559nab a22003617a 4500 | ||
|---|---|---|---|
| 003 | EC-PaCDF | ||
| 005 | 20201015104506.0 | ||
| 008 | 160905b20142014xxu|||||||||||||||||eng|| | ||
| 040 |
_aEC-PaCDF _bspa _cEC-PaCDF |
||
| 041 | _aeng | ||
| 082 | 0 | 4 |
_223 _a551.9 |
| 100 | 1 |
_aAtwood, Alyssa R. _95557 _eautor |
|
| 245 | 1 | 0 |
_aCharacterization of unusual sterols and long chain diols, triols, keto-ols and n-alkenols in El Junco Lake, Galápagos / _cAlyssa R. Atwood, John K. Volkman and Julian P. Sachs. |
| 260 | 3 | _c2014. | |
| 300 | _a: 80-89 p. | ||
| 520 | 0 | _aA variety of lipid biomarkers were identified in sediments from El Junco Lake, Galápagos and their sources investigated for potential use in paleoclimate applications. A series of unusual sterols was also found, including 4 a-methylgorgostanol, reported in only four species of dinoflagellates to date. We also tentatively assigned 22,23-methylene-4a-methyl-24-ethylcholest-5-en-3b-ol, the mass spectrum of which matched a sterol found in resting cysts of the dinoflagellate Peridinium umbonatum. In addition, we identified the novel sterol 4a,22,23,24-tetramethyl-5a-cholest-22E-en-3b-ol. Based on the unique sterol distribution, we hypothesize that a dinoflagellate from the genus Peridinium was the primary source of dinosterol and the novel sterols throughout the sediment record. The source specificity and abundance throughout the 3.7 m of recovered sediment make dinosterol an excellent target for hydrogen isotope analysis for use as a paleohydrological proxy in future studies. The abundant C 1,x20-diols and keto-ols, C29 9,10-diol and C2930 1,x9,x10-triol likely derive from the ferns Azolla microphylla and Cyathea weatherbyana, while sources of the C30 1,x16-diol and keto-ol, C1,x18-diol and keto-ol, and theC30–C32 32n-alken-1-ols are likely limited to aquatic microalgae. Due to their source specificity, these diol, triol, keto-ol, and n-alkenol biomarkers present further tools for studying past environmental and climatic change. | |
| 546 | _aInglés | ||
| 653 | _aCharacterization | ||
| 653 | _aCaracterización | ||
| 653 | _aSterols | ||
| 653 | _aEsteroles | ||
| 653 | _aTriols | ||
| 653 | _aKeto-ols | ||
| 653 | _aN-alkenols | ||
| 653 | _aJunco Lake | ||
| 653 | _aLago Junco | ||
| 653 | _aGalápagos | ||
| 700 |
_aVolkman, John K. _95558 _eautor |
||
| 700 | 1 |
_aSachs, Julian P. _92906 _eautor |
|
| 773 | 0 |
_tOrganic Geochemistry. _gVol. 66 (2014), p. 80–89. |
|
| 856 | 4 | 0 | _uhttp://dx.doi.org/10.1016/j.orggeochem.2013.11.004 |
| 942 |
_2ddc _cARTICLE |
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| 999 |
_c12839 _d12839 |
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