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- W2109303096 abstract "During ODP Leg 201 microbial communities in Eastern Equatorial Pacific Ocean and Peru Margin sediments were investigated. The sediment layers sampled extended down to 420 m below the sea floor, with estimated ages of up to 40 million years. Contamination-free anoxic slurries were inoculated into media containing different substrate combinations, all at micromolar concentration. These culture media were designed for a broad spectrum of physiological groups. A total of 162 pure cultures were isolated that could be grouped into 19 different phylotypes based on 16S rRNA gene analysis. The isolates belonged to the Alpha-, Gamma- and Deltaproteobacteria, the Firmicutes, Actinobacteria, and Bacteroidetes. The genera most frequently isolated were Bacillus (68 isolates) and Rhizobium (40 isolates). Comparison of strains with the same phylotypes by enterobacterial repetitive intergenic consensus (ERIC-PCR) analysis revealed the presence of several subgroups that did not correlate with medium, sediment depth or sampling site. The majority of the isolates, although obtained from anoxic environments and isolated under strictly anoxic conditions, turned out to be facultativly aerobic. Physiologically, the isolates were characterized as generalists, able to utilize a broad variety of electron donors with either oxygen, nitrate and in some cases manganese oxides as electron acceptors. The diversity inferred from physiological tests was even higher than that on the phylogenetic or genomic level. The outcome of the contamination tests, the isolation of close relatives of already known subsurface bacteria, the repeated finding of the same phylotype from different sites and the level of diversity present in the culture collection strongly suggest that indigenous deep-biosphere bacteria had been isolated." @default.
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- W2109303096 date "2007-07-23" @default.
- W2109303096 modified "2023-10-18" @default.
- W2109303096 title "Phylogenetic and Physiological Diversity of Cultured Deep-Biosphere Bacteria from Equatorial Pacific Ocean and Peru Margin Sediments" @default.
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- W2109303096 doi "https://doi.org/10.1080/01490450701456453" @default.
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