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Kosmotoga pacifica sp. nov., a thermophilic chemoorganoheterotrophic bacterium isolated from an East Pacific hydrothermal sediment ArchiMer
L'Haridon, Stephane; Jiang, Lijing; Alain, Karine; Chalopin, Morgane; Rouxel, Ouafae; Beauverger, Mikael; Xu, Hongxiu; Shao, Zongze; Jebbar, Mohamed.
A novel strictly anaerobic thermophilic heterotrophic bacterium, strain SLHLJ1T, was isolated from a Pacific hydrothermal sediment. Cells were Gram-negative coccobacilli (approximately 1.0 × 0.6 μm) with a toga. It grew at temperatures between 33 and 78 °C (optimum 70 °C). Elemental sulphur and l-cystine stimulated its growth. It contained C16:0, C16:1 ω11c, C18:0 and C18:1 ω9c as major fatty acids (>5 %), 3 phospholipids and 2 glycolipids as polar lipids. Its DNA G+C content was 43.7 mol%. Phylogenetic analyses based on 16S rRNA gene sequences placed strain SLHLJ1T within the family Thermotogaceae. The novel isolate was most closely related to Kosmotoga arenicorallina (97.93 % 16S rRNA gene sequence similarity), K. olearia (92.43 %) and K. shengliensis...
Tipo: Text Palavras-chave: Thermotogales; Kosmotoga; Kosmotoga pacifica; Hydrothermal sediment.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00171/28204/26509.pdf
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Microplastic bacterial communities in the Bay of Brest: Influence of polymer type and size ArchiMer
Frere, Laura; Maignien, Lois; Chalopin, Morgane; Huvet, Arnaud; Rinnert, Emmanuel; Morrison, Hilary; Kerninon, Sandrine; Cassone, Anne-laure; Lambert, Christophe; Reveillaud, Julie; Paul-pont, Ika.
Microplastics (<5 mm) exhibit intrinsic features such as density, hydrophobic surface, or high surface/volume ratio, that are known to promote microbial colonization and biofilm formation in marine ecosystems. Yet, a relatively low number of studies have investigated the nature of microplastic associated bacterial communities in coastal ecosystems and the potential factors influencing their composition and structure. Here, we characterized microplastics collected in the Bay of Brest by manual sorting followed by Raman spectroscopy and studied their associated bacterial assemblages using 16S amplicon high-throughput sequencing. Our methodology allowed discriminating polymer type (polyethylene, polypropylene and polystyrene) within small size ranges...
Tipo: Text Palavras-chave: Bacteria; Microplastics; Coastal ecosystem; Metabarcoding; Vibrios.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00449/56082/57614.pdf
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