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• W2007812929 abstract "Abstract The biodegradation of crude oil by microorganisms from well Luo-801, China, was examined in cultures grown under conditions that promoted either methanogenesis or sulfate reduction, at 35 °C and 55 °C. Headspace gas and oil compositions were characterized at 180 d and 540 d. Alkylphenanthrenes are relatively recalcitrant to bacterial attack and the biodegradation of these compounds appeared to be insignificant after 180 d under both conditions, but is evident after 540 d. The depletion of alkylphenanthrenes was monitored through evaluation of the ratio of alkylphenanthrenes to the most bioresistant, analyzed component (C 28 20R triaromatic steroid hydrocarbon) and isomer susceptibility also was evaluated by relative abundance comparison within the compound class. The influence of growth temperature varied. Only slight differences in alkylphenanthrene concentrations were observed after 180 d whereas the greater degrees of biodegradation were observed at 35 °C in the methanogenic culture and at 55 °C in the sulfate reducing culture. Overall, higher biodegradation rates occur under sulfate reducing condition, which is consistent with the conclusion that methanogens are generally less able to compete for substrates than sulfate reducers. The biodegradation susceptibility of alkylphenanthrenes decreases with increasing degree of alkylation, i.e., phenanthrene (P) and methylphenanthrenes (MPs) were more easily biodegradable than C 2 -alkylphenanthrenes (C 2 -Ps) and C 3 -alkylphenanthrenes (C 3 -Ps). Biodegradation selectivity for specific homologues is not striking for the limited time duration of the experiments. However, 3-MP seems slightly more vulnerable than other methylphenanthrene isomers and 1,7-DMP has slightly higher ability to resist biodegradation than the other C 2 -P isomers. The commonly used thermal maturity parameters derived from methylphenanthrene isomer ratios are altered insignificantly by biodegradation and remain valid for geochemical assessment. This information should be useful for assessing the limits of in situ crude oil biodegradation." @default.
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• W2007812929 date "2013-08-01" @default.
• W2007812929 modified "2023-10-01" @default.
• W2007812929 title "Impact of anaerobic biodegradation on alkylphenanthrenes in crude oil" @default.
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• W2007812929 doi "https://doi.org/10.1016/j.orggeochem.2013.05.003" @default.
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