Results 141 to 150 of about 5,314 (168)

Nitrogen Metabolism and Kinetics of Ammonia-Oxidizing Archaea

2011
The discovery of ammonia-oxidizing mesophilic and thermophilic Group I archaea changed the century-old paradigm that aerobic ammonia oxidation is solely mediated by two small clades of Beta- and Gammaproteobacteria. Group I archaea are extremely diverse and ubiquitous in marine and terrestrial environments, accounting for 20-30% of the microbial ...
Willm, Martens-Habbena, David A, Stahl
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Archaea predominate among ammonia-oxidizing prokaryotes in soils

Nature, 2006
Ammonia oxidation is the first step in nitrification, a key process in the global nitrogen cycle that results in the formation of nitrate through microbial activity. The increase in nitrate availability in soils is important for plant nutrition, but it also has considerable impact on groundwater pollution owing to leaching.
S, Leininger, T, Urich, M, Schloter, L, Schwark, J, Qi, G W, Nicol, J I, Prosser, S C, Schuster, C, Schleper   +8 more
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Variability of the transporter gene complement in ammonia-oxidizing archaea

Trends in Microbiology, 2014
Ammonia-oxidizing archaea (AOA) are a widespread and abundant component of microbial communities in many different ecosystems. The extent of physiological differences between individual AOA is, however, unknown. Here, we compare the transporter gene complements of six AOA, from four different environments and two major clades, to assess their potential
Offre P, Kerou M, Spang A, Schleper C
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Ammonia-oxidizing bacteria and archaea in sediments of the Gulf of Mexico

Environmental Technology, 2014
The diversity (richness and community composition) of ammonia-oxidizing archaea (AOA) and bacteria (AOB) within sediments of the Gulf of Mexico was examined. Using polymerase chain reaction primers designed to specifically target the archaeal ammonia monooxygenase-subunit (amoA) gene and bacterial amoA gene, we found AOA and AOB to be present in all ...
Flood, M, Frabutt, D, Floyd, D, Powers, A, Ezegwe, U, Devol, A, Tiquia-Arashiro, SM   +6 more
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Ammonia-oxidizing archaea have more important role than ammonia-oxidizing bacteria in ammonia oxidation of strongly acidic soils [PDF]

ISME Journal, 2011
Abstract Increasing evidence demonstrated the involvement of ammonia-oxidizing archaea (AOA) in the global nitrogen cycle, but the relative contributions of AOA and ammonia-oxidizing bacteria (AOB) to ammonia oxidation are still in debate. Previous studies suggest that AOA would be more adapted to ammonia-limited oligotrophic conditions,
Hangwei Hu, Limei Zhang, Ji-Zheng He
exaly   +3 more sources

The Metalloenzymology of Hydroxylamine Oxidation by Ammonia Oxidizing Bacteria and Archaea

2021
177 pages ; Anthropogenic influences on environmental N-fluxes, particularly the accelerated production of NxOy species, have established a pressing demand to understand how ammonia oxidizing bacteria (AOB) and archaea (AOA) carry out controlled N-oxide transformations.
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Diversity and mode of transmission of ammonia‐oxidizing archaea in marine sponges

Environmental Microbiology, 2008
Summary The model marine crenarchaeote ‘ Cenarchaeum symbiosum ’ is until now the only ammonia‐oxidizing archaeon known from a marine sponge. Here, phylogenetic analyses based on the 16S rRNA and ammonia monooxygenase subunit A ( amoA )
Steger, Doris, Ettinger-Epstein, Piers, Whalan, Stephen, Hentschel, Ute, de Nys, Rocky, Wagner, Michael, Taylor, Michael W.   +6 more
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Homologues of nitrite reductases in ammonia‐oxidizing archaea: diversity and genomic context

Environmental Microbiology, 2010
Summary Ammonia‐oxidizing archaea are frequent and ubiquitous inhabitants of terrestrial and marine environments. As they have only recently been detected, most aspects of their metabolism are yet unknown.
Bartossek, Rita, Nicol, Graeme W, Lanzen, Anders, Klenk, Hans-Peter, Schleper, Christa   +4 more
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Ammonia-oxidizing Archaea in Kamchatka Hot Springs

Geomicrobiology Journal, 2011
Mounting evidence suggests that ammonia-oxidizing archaea (AOA) may play important roles in nitrogen cycling in geothermal environments. In this study, the diversity, distribution and ecological significance of AOA in terrestrial hot springs in Kamchatka (Far East Russia) were explored using amoA genes complemented by analysis of glycerol dialkyl ...
Weidong Zhao, Zhaoqi Song, Hongcheng Jiang, Wenjun Li, Xiaozhen Mou, Christopher S. Romanek, Juergen Wiegel, Hailiang Dong, Chuanlun L. Zhang   +8 more
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The production of nitric oxide by marine ammonia‐oxidizing archaea and inhibition of archaeal ammonia oxidation by a nitric oxide scavenger

Environmental Microbiology, 2015
Summary Nitrification is a critical process for the balance of reduced and oxidized nitrogen pools in nature, linking mineralization to the nitrogen loss processes of denitrification and anammox. Recent studies indicate a significant contribution of ammonia‐oxidizing archaea ( AOA
Willm, Martens-Habbena, Wei, Qin, Rachel E A, Horak, Hidetoshi, Urakawa, Andrew J, Schauer, James W, Moffett, E Virginia, Armbrust, Anitra E, Ingalls, Allan H, Devol, David A, Stahl   +9 more
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