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Different conditions, such as incubation time (i.e., 20 or 40 d), oil weathering, and addition of an oleophilic fertilizer (S200), were evaluated. Weathering slowed down the degradation of the fuel oil, probably because of the loss of lower and more labile components, but the addition of S200 enhanced significantly the extension of the biodegradation. n-Alkanes, alkylcyclohexanes, alkylbenzenes, and the two- to three-ring polycyclic aromatic hydrocarbons (PAHs) were degraded in 20 or 40 d of incubation of the original oil, whereas the biodegradation efficiency decreased for higher PAHs and with the increase of alkylation. Molecular markers were degraded according to the following sequence: Acyclic isoprenoids &amp;lt; diasteranes &amp;lt; C27-steranes &amp;lt; \u03b2\u03b2-steranes &amp;lt; homohopanes &amp;lt; monoaromatic steranes &amp;lt; triaromatic steranes. Isomeric selectivity was observed within the C1- and C2-phenanthrenes, dibenzothiophenes, pyrenes, and chrysenes, providing source and weathering indices for the characterization of the heavy oil spill. Acyclic isoprenoids, C27-steranes, C1- and C2-naphthalenes, phenanthrenes, and dibenzothiophenes were degraded completely when S200 was used. The ratios of the C2- and C3-alkyl homologues of fluoranthene\/pyrene and chrysene\/benzo[a]anthracene are proposed as source ratios in moderately degraded oils. The 4-methylpyrene and 3-methylchrysene were refractory enough to serve as conserved internal markers in assessing the degradation of the aromatic fraction in a manner similar to that of hopane, as used for the aliphatic fraction.<\/jats:p>","DOI":"10.1897\/04-604r.1","type":"journal-article","created":{"date-parts":[[2005,8,23]],"date-time":"2005-08-23T18:46:13Z","timestamp":1124822773000},"page":"2203-2217","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":96,"title":["The <i>Prestige<\/i> oil spill. I. Biodegradation of a heavy fuel oil under simulated conditions"],"prefix":"10.1093","volume":"24","author":[{"given":"Sergi","family":"D\u00edez","sequence":"first","affiliation":[{"name":"Department of Environmental Chemistry, Institute of Chemical and Environmental Research, Jordi Girona Salgado, 18\u201326, 08034-Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordi","family":"Sabat\u00e9","sequence":"additional","affiliation":[{"name":"Department of Microbiology, University of Barcelona, Diagonal, 645, 08028-Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"Vi\u00f1as","sequence":"additional","affiliation":[{"name":"Department of Microbiology, University of Barcelona, Diagonal, 645, 08028-Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Josep M.","family":"Bayona","sequence":"additional","affiliation":[{"name":"Department of Environmental Chemistry, Institute of 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