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ABSTRACT: Complete suppression of nitrite oxidizing bacteria by continuously low oxygen levels in biofilm-based mainstream partial nitritation/anammox

PROVIDER: PRJEB45279 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR6212380_1.fastq.gz	Fastqsanger.gz
	ERR6212380_2.fastq.gz	Fastqsanger.gz
	ERR6212390_1.fastq.gz	Fastqsanger.gz
	ERR6212390_2.fastq.gz	Fastqsanger.gz
	ERR6212381_1.fastq.gz	Fastqsanger.gz

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Project description:Control trials of nitrite-oxidizing bacteria under mainstream conditions for achieving partial nitritation

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partial-nitritation anammox reactor

Project description:Identify and characterize two distinct communities, the aerobic community and the anaerobic community in the partial nitritation/anammox reactors using metaproteomics approach

2019-07-26 | PXD009787 | Pride

Transcriptome Kuenenia stuttgartiensis bioreactor

Project description:Anaerobic ammonium-oxidising (anammox) bacteria, members of the ‘Candidatus Brocadiaceae’ family, play an important role in the nitrogen cycle and are estimated to be responsible for about half of the oceanic nitrogen loss to the atmosphere. Anammox bacteria combine ammonium with nitrite and produce dinitrogen gas via the intermediates nitric oxide and hydrazine (anammox reaction) while nitrate is formed as a by-product. These reactions take place in a specialized, membrane-bound compartment called the anammoxosome. Therefore, the substrates ammonium, nitrite and product nitrate have to cross the outer-, cytoplasmic- and anammoxosome membranes to enter or exit the anammoxosome. The genomes of all anammox species harbour multiple copies of ammonium-, nitrite- and nitrate transporter genes. Here we investigated how the distinct genes for ammonium-, nitrite- and nitrate- transport were expressed during substrate limitation in membrane bioreactors. Transcriptome analysis of Kuenenia stuttgartiensis planktonic cells under ammonium-limitation showed that three of the seven ammonium transporter genes and one of the six nitrite transporter genes were significantly upregulated, while another ammonium and nitrite transporter gene were downregulated in nitrite limited growth conditions. The two nitrate transporters were expressed to similar levels in both conditions. In addition, genes encoding enzymes involved in the anammox reaction were differentially expressed, with those using nitrite as a substrate being upregulated under nitrite limited growth and those using ammonium as a substrate being upregulated during ammonium limitation. Taken together, these results give a first insight in the potential role of the multiple nutrient transporters in regulating transport of substrates and products in and out of the compartmentalized anammox cell.

2020-06-05 | GSE148825 | GEO

Project description:Nitritation-anammox sidestream to mainstream

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Project description:Mainstream partial nitrification/anammox

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Project description:Partial nitritation-anammox biofilm community

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Biofilm colonization and succession in a full-scale partial nitritation-anammox moving bed biofilm bioreactor

Project description:Partial nitritation anammox biofilm colonization

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Community composition of bacteria involved in fixed nitrogen loss in the water column of two major oxygen minimum zones in the ocean

Project description:The community composition (in terms of abundance, distribution and contribution of diverse clades) of bacteria involved in nitrogen transformations in the oxygen minimum zones may be related to the rates of fixed N loss in these systems. The abundance of both denirifying and anammox bacteria, and the assemblage composition of denitrifying bacteria were investigated in the Eastern Tropical South Pacific and the Arabian Sea using assays based on molecular markers for the two groups of bacteria. The abundance and distribution of bacteria associated with the fixed N removal processes denitrification and anammox were investigated using quantitative PCR for genes encoding nitrite reductase (nirK and nirS) in denitrifying bacteria and hydrazine oxidase(hzo) and 16S rRNA genesin anammox bacteria. All of these genes had depth distributions with maxima associated with the secondary nitrite maximum in low oxygen waters. NirS was mch more abundant than nirK, and much more abundant than the 16S rRNA gene from anammox bacteria. The ratio of hzo:16S rRNA for anammox was low and variable implying greater unexplored diversity in the the hzo gene. Assemblage composition of the abundant nirS-type denitrifiers was evaluated using a funcitonal gene microarray. Of the nirS archetypes represented on the microarray, very few occurred speficically in one region or depth interval, but the assemblages varied significantly. Community composition of denitrifiers based on microarray analysis of the nirS gene was most different between geographical regions. Within each region, the surface layer and OMZ assemblages clustered distinctly. Thus, in addition to spatial and temporal variation in denitrificaiton and anammox rates, both microbial abundance and community composition also vary between OMZ regions and depths.

2013-09-12 | GSE50787 | GEO

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