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- W1566369640 abstract "Summary Ammonium‐oxidizing chemoautotrophic members of T haumarchaea are proposed to be the key players in the assimilation of bicarbonate in the dark ( ABD ). However, this process may also involve heterotrophic metabolic pathways, such as fixation of carbon dioxide ( CO 2 ) via various anaplerotic reactions. We collected samples from the depth of 4900 m at the M atapan‐ V avilov D eep ( MVD ) station ( H ellenic T rench, E astern M editerranean) and used the multiphasic approach to study the ABD mediators in this deep‐sea ecosystem. At this depth, our analysis indicated the occurrence of actively CO 2 ‐fixing heterotrophic microbial assemblages dominated by G ammaproteobacteria with virtually no T haumarchaea present. [ 14 C ]‐bicarbonate incorporation experiments combined with shotgun [ 14 C ]‐proteomic analysis identified a series of proteins of gammaproteobacterial origin. More than quarter of them were closely related with A lteromonas macleodii ‘deep ecotype’ AltDE , the predominant organism in the microbial community of MVD . The present study demonstrated that in the aphotic/hadal zone of the M editerranean S ea, the assimilation of bicarbonate is associated with both chemolithoauto‐ and heterotrophic ABD . In some deep‐sea areas, the latter may predominantly contribute to the de novo synthesis of organic carbon which points at the important and yet underestimated role heterotrophic bacterial populations can play the in global carbon cycle/sink in the ocean interior." @default.
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- W1566369640 date "2014-07-28" @default.
- W1566369640 modified "2023-09-30" @default.
- W1566369640 title "Heterotrophic bicarbonate assimilation is the main process of<i>de novo</i>organic carbon synthesis in hadal zone of the Hellenic Trench, the deepest part of Mediterranean Sea" @default.
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- W1566369640 doi "https://doi.org/10.1111/1758-2229.12192" @default.
- W1566369640 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25756124" @default.
- W1566369640 hasPublicationYear "2014" @default.
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