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The strains, designated R1 and R4-2, belonged to Nitratireductor and Oricola, respectively. These genera are phylogenetically close. Nitratireductor R1 or its close relatives were detected as the main bacteria (12% of the total bacteria) and Oricola R4-2 or its close relatives were also significantly detected (5%) in the liquefied PP-enriched seawater, suggesting that these bacteria utilized liquefied PP as a carbon source. Nitratireductor R1 showed liquefied PP-degrading activity at 50\u00b0C but not at 28\u201342\u00b0C, while Oricola R4-2 showed the activity at 42\u201350\u00b0C but not at 28\u00b0C. At 50\u00b0C, these two strains degraded liquefied PP of all lengths detected, isoprenoid-derived branched alkane (pristane), and n-alkane (n-hexadecane) to a similar extent, and also degraded aromatic compounds. Pristane and n-hexadecane appeared not to induce the PP-degrading activity. These results indicate that Nitratireductor and Oricola bacteria could be used in industrial applications for degrading liquefied PP and polyethylene and aromatic structures of liquefied aromatic-containing plastics at 50\u00b0C.<\/jats:p>","DOI":"10.1093\/femsle\/fnaf137","type":"journal-article","created":{"date-parts":[[2025,12,15]],"date-time":"2025-12-15T12:35:25Z","timestamp":1765802125000},"source":"Crossref","is-referenced-by-count":3,"title":["<i>Nitratireductor<\/i>\n                    and\n                    <i>Oricola<\/i>\n                    bacteria as moderately thermophilic polypropylene degraders in marine environments"],"prefix":"10.1093","volume":"372","author":[{"given":"Serisa","family":"Ebina","sequence":"first","affiliation":[{"name":"Department of Marine Resource Science, Kochi University , 200 Otsu, Monobe, Nankoku, Kochi 783-8502 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takamasa","family":"Oota","sequence":"additional","affiliation":[{"name":"Department of Marine Resource Science, Kochi University , 200 Otsu, Monobe, Nankoku, Kochi 783-8502 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6828-9515","authenticated-orcid":false,"given":"Maki","family":"Teramoto","sequence":"additional","affiliation":[{"name":"Department of Marine Resource Science, Kochi University , 200 Otsu, Monobe, Nankoku, Kochi 783-8502 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2025,12,5]]},"reference":[{"key":"2026030123461486400_bib1","doi-asserted-by":"publisher","first-page":"10","DOI":"10.1016\/j.ibiod.2011.12.008","article-title":"Hydrocarbon-utilizing bacteria associated with biofouling materials from offshore waters of the Arabian Gulf","volume":"69","author":"Al-Awadhi","year":"2012","journal-title":"Int Biodeterior Biodegrad"},{"key":"2026030123461486400_bib2","doi-asserted-by":"publisher","first-page":"289","DOI":"10.1016\/S0269-8579(05)80005-X","article-title":"Production of emulsifying agents during growth of a marine Alteromonas in sea water with eicosane as carbon source, a solid hydrocarbon","volume":"6","author":"Al-Mallah","year":"1990","journal-title":"Oil Chem Pollut"},{"key":"2026030123461486400_bib3","doi-asserted-by":"publisher","first-page":"800","DOI":"10.1111\/j.1365-2672.2011.05104.x","article-title":"Alkane-degrading properties of dietzia sp. 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