@article {ISI:000372364000020,
	title = {{Metatranscriptomic insights into polyphosphate metabolism in marine sediments}},
	journal = {ISME JOURNAL},
	volume = {10},
	number = {4},
	year = {2016},
	month = {apr},
	pages = {1015{\textendash}1019},
	type = {Article},
	abstract = {Microorganisms can influence inorganic phosphate (P-i) in pore waters, and thus the saturation state of phosphatic minerals, by accumulating and hydrolyzing intracellular polyphosphate (poly-P). Here we used comparative metatranscriptomics to explore microbial poly-P utilization in marine sediments. Sulfidic marine sediments from methane seeps near Barbados and from the Santa Barbara Basin (SBB) oxygen minimum zone were incubated under oxic and anoxic sulfidic conditions. Pi was sequestered under oxic conditions and liberated under anoxic conditions. Transcripts homologous to poly-P kinase type 2 (ppk2) were 6-22 x more abundant in metatranscriptomes from the anoxic incubations, suggesting that reversible poly-P degradation by Ppk2 may be an important metabolic response to anoxia by marine microorganisms. Overall, diverse taxa differentially expressed homologues of genes for poly-P degradation (ppk2 and exopolyphosphatase) under different incubation conditions. Sulfur-oxidizing microorganisms appeared to preferentially express genes for poly-P degradation under anoxic conditions, which may impact phosphorus cycling in a wide range of oxygen-depleted marine settings.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {1751-7362},
	doi = {10.1038/ismej.2015.169},
	author = {Jones, Daniel S and Flood, Beverly E and Bailey, Jake V}
}
@article {ISI:000361984700015,
	title = {{Comparison of Archaeal and Bacterial Diversity in Methane Seep Carbonate Nodules and Host Sediments, Eel River Basin and Hydrate Ridge, USA}},
	journal = {MICROBIAL ECOLOGY},
	volume = {70},
	number = {3},
	year = {2015},
	month = {oct},
	pages = {766{\textendash}784},
	type = {Article},
	abstract = {Anaerobic oxidation of methane (AOM) impacts carbon cycling by acting as a methane sink and by sequestering inorganic carbon via AOM-induced carbonate precipitation. These precipitates commonly take the form of carbonate nodules that form within methane seep sediments. The timing and sequence of nodule formation within methane seep sediments are not well understood. Further, the microbial diversity associated with sediment-hosted nodules has not been well characterized and the degree to which nodules reflect the microbial assemblage in surrounding sediments is unknown. Here, we conducted a comparative study of microbial assemblages in methane-derived authigenic carbonate nodules and their host sediments using molecular, mineralogical, and geochemical methods. Analysis of 16S rRNA gene diversity from paired carbonate nodules and sediments revealed that both sample types contained methanotrophic archaea (ANME-1 and ANME-2) and syntrophic sulfate-reducing bacteria (Desulfobacteraceae and Desulfobulbaceae), as well as other microbial community members. The combination of geochemical and molecular data from Eel River Basin and Hydrate Ridge suggested that some nodules formed in situ and captured the local sediment-hosted microbial community, while other nodules may have been translocated or may represent a record of conditions prior to the contemporary environment. Taken together, this comparative analysis offers clues to the formation regimes and mechanisms of sediment-hosted carbonate nodules.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0095-3628},
	doi = {10.1007/s00248-015-0615-6},
	author = {Mason, Olivia U and Case, David H and Naehr, Thomas H and Lee, Raymond W and Thomas, Randal B and Bailey, Jake V and Orphan, Victoria J}
}
