Results 121 to 130 of about 5,499 (152)

pH as a Driver for Ammonia-Oxidizing Archaea in Forest Soils

Microbial Ecology, 2014
In this study, we investigated the impact of soil pH on the diversity and abundance of archaeal ammonia oxidizers in 27 different forest soils across Germany. DNA was extracted from topsoil samples, the amoA gene, encoding ammonia monooxygenase, was amplified; and the amplicons were sequenced using a 454-based pyrosequencing approach.
Stempfhuber, Barbara, Engel, Marion, Fischer, Doreen, Neskovic-Prit, Ganna, Wubet, Tesfaye, Schöning, Ingo, Gubry-Rangin, Cécile, Kublik, Susanne, Schloter-Hai, Brigitte, Rattei, Thomas, Welzl, Gerhard, Nicol, Graeme W., Schrumpf, Marion, Buscot, Francois, Prosser, James, Schloter, Michael   +15 more
openaire   +7 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

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 ...
Hailiang Dong, Wen-Jun Li, Xiaozhen Mou
exaly   +2 more sources

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
openaire   +3 more sources

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
openaire   +3 more sources

Physiology and Genomics of Ammonia-Oxidizing Archaea

2011
This chapter is divided into two major sections: a brief comparative description of the physiology of ammonia-oxidizing archaea (AOA) in relation to the better-characterized ammonia-oxidizing bacteria (AOB); and a discussion of features that have been gleaned from the genome sequence and its relevance to environmental genomic studies.
Hidetoshi Urakawa, Willm Martens-Habbena, David A. Stahl   +2 more
openaire   +1 more source

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,
Hang-Wei Hu, Limei Zhang, Ji-Zheng He
exaly   +3 more sources

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
openaire   +4 more sources

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
openaire   +2 more sources