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"bioproject": "PRJNA321388",
"accession": "MGYS00002563",
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"last-update": "2019-11-07T16:14:07",
"secondary-accession": "SRP097059",
"centre-name": "University of Tennessee",
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"study-abstract": "Difficulties in studying growth dynamics of marine sediment microbial populations in a natural setting limits the ability to identify functions in novel populations, assess competition mechanisms, and extrapolate from growth dynamics in pure cultures. We used qPCR and 16S rRNA gene tag libraries to measure relative growth rates of a microbial community from Cape Lookout Bight, NC, in a laboratory mesocosm. Homogenized sediments were incubated for 122 days, hydrogen concentrations were consistent with thermodynamic control by sulfate-reducing prokaryotes during the sulfate-reducing phase and methanogenesis commenced when hydrogen increased above the methanogen thermodynamic maintenance. Uncultured clades of Methanosarcinales and Methanomicrobiales grew during the methanogenic phase with doubling times ranging from 15-46 days, considerably slower than those grown in pure cultures. An uncultured archaeal group, Kazan-3A-21, also increased with methane production. The majority of the population were from deeply-branching uncultured groups and, like the majority of the putative sulfate reducers, were mostly unresponsive to the shift from sulfate reduction to methanogenesis. We conclude that marine sediment methanogens grow more slowly than cultures, once thermodynamic inhibition by sulfate reducers is alleviated; and the majority of the diversity present in marine sediments grow or die more slowly than could be observed in our 122 day incubation.",
"study-name": "marine sediment metagenome Targeted loci environmental",
"data-origination": "HARVESTED"
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