Results 11 to 20 of about 6,333 (204)

amoA-encoding archaea and thaumarchaeol in the lakes on the northeastern Qinghai-Tibetan Plateau, China [PDF]

Frontiers in Microbiology, 2013
All known ammonia-oxidizing archaea (AOA) belong to the phylum Thaumarchaeota within the domain Archaea. AOA possess the diagnostic amoA gene (encoding the alpha subunit of ammonia monooxygenase) and produce lipid biomarker thaumarchaeol.
Jian eYang, Hongchen eJiang, Hailiang eDong, Huanye eWang, Geng eWu, Weiguo eHou, Weiguo eLiu, Chuanlun eZhang, Yongjuan eSun, Zhongping eLai   +9 more
doaj   +5 more sources

Archaeal amoA and ureC genes and their transcriptional activity in the Arctic Ocean [PDF]

Scientific Reports, 2014
International audienceThaumarchaeota and the gene encoding for a subunit of ammonia monooxygenase (amoA) are ubiquitous in Polar Seas, and some Thaumarchaeota also have a gene coding for ureC, diagnostic for urease. Using quantitative PCR we investigated
Tremblay, Jean-ERic, Lovejoy, Connie, Potvin, Marianne, Pedneault, Estelle, Galand, Pierre E   +4 more
core   +3 more sources

The ecological dichotomy of ammonia-oxidizing archaea and bacteria in the hyper-arid soils of the Antarctic Dry Valleys [PDF]

Frontiers in Microbiology, 2014
The McMurdo Dry Valleys of Antarctica are considered to be one of the most physically and chemically extreme terrestrial environments on the Earth. However, little is known about the organisms involved in nitrogen transformations in these environments ...
Catarina Maria Magalhães, Ana eMachado, Béatrice eFrank-Fahle, Charles K. Lee, Craig S. Cary, Craig S. Cary   +5 more
doaj   +2 more sources

Abundances of crenarchaeal amoA genes and transcripts in the Pacific Ocean [PDF]

Environmental Microbiology, 2009
Planktonic Crenarchaea are thought to play a key role in chemolithotrophic ammonia oxidation, a critical step of the marine nitrogen (N) cycle. In this study, we examined the spatial distributions of ammonia-oxidizing Crenarchaea across a large (∼5200 km)
Karl, David M., Church, Matthew J., DeLong, Edward, Wai, Brenner   +3 more
core   +3 more sources

Detection and quantification of expression of amoA by competitive reverse transcription-PCR

Water Science and Technology, 2002
Ammonia oxidation by chemolithoautotrophic ammonia-oxidizing bacteria is an important step in the biological nitrogen removal process. The first conversion step, the oxidation of ammonia to hydroxylamine is catalyzed by ammonia monooxygenase (AMO).
H. Miura, N. Noda, Y. Inamori, A. Hirata, Y. Ebie, M. Matsumura, S. Tsuneda   +6 more
core   +3 more sources

AmoA-Targeted Polymerase Chain Reaction Primers for the Specific Detection and Quantification of Comammox Nitrospira in the Environment [PDF]

Frontiers in Microbiology, 2017
Nitrification, the oxidation of ammonia via nitrite to nitrate, has always been considered to be catalyzed by the concerted activity of ammonia- and nitrite-oxidizing microorganisms.
Petra Pjevac, Clemens Schauberger, Lianna Poghosyan, Craig W. Herbold, Maartje A. H. J. van Kessel, Anne Daebeler, Michaela Steinberger, Mike S. M. Jetten, Sebastian Lücker, Michael Wagner, Holger Daims   +10 more
doaj   +4 more sources

Real-time monitoring of ammonia-oxidizing activity in a nitrifying biofilm by amoA mRNA analysis

Water Science and Technology, 2002
Ammonia monooxygenase encoding mRNA (amoA mRNA) transcription in the wastewater treatment process was investigated using reverse transcription PCR (RT-PCR) as the model indicating specific function and activity in nitrifying processes.
T. Nagamune, A. Kitayama, Y. Aoi, A. Hirata, Y. Shiramasa, S. Tsuneda   +5 more
core   +3 more sources

Pesticide Side Effects in an Agricultural Soil Ecosystem as Measured by amoA Expression Quantification and Bacterial Diversity Changes. [PDF]

PLoS ONE, 2015
Background and methodsAssessing the effects of pesticide hazards on microbiological processes in the soil is currently based on analyses that provide limited insight into the ongoing processes. This study proposes a more comprehensive approach.
Louise Feld, Mathis Hjort Hjelmsø, Morten Schostag Nielsen, Anne Dorthe Jacobsen, Regin Rønn, Flemming Ekelund, Paul Henning Krogh, Bjarne Westergaard Strobel, Carsten Suhr Jacobsen   +8 more
doaj   +2 more sources

Thaumarchaeotes abundant in refinery nitrifying sludges express amoA but are not obligate autotrophic ammonia oxidizers [PDF]

Proceedings of the National Academy of Sciences, 2011
Nitrification is a core process in the global nitrogen cycle that is essential for the functioning of many ecosystems. The discovery of autotrophic ammonia-oxidizing archaea (AOA) within the phylum Thaumarchaeota has changed our perception of the ...
Jeppe L. Nielsen, Holger Daims, Roland Hatzenpichler, Sinninghe Damste, J.S., Nielsen, Jeppe Lund; id_orcid, Daims, M., Demsté, J. S. S., Michael Wagner, Ivana Brito, Mussmann, M., Brito, I., Head, I.M., Angela Pitcher, Anneliese Müller, Mußmann, M, Per Halkjær Nielsen, Pitcher, A., Hatzenpichler, R., Ian M. Head, Jaap S. Sinninghe Damsté, Nielsen, P.H., Wagner, M., Brito, Ivana, Nielsen, J.L., Nielsen, Per Halkjær, Andreas Richter, Müller, A., Marc Mußmann, Daims, H., Head, I. M., Richter, A.   +30 more
core   +5 more sources

Genome reduction in marine ammonia-oxidizing archaea driven by elevated temperature. [PDF]

mLife
mLife, EarlyView.
Ren M, Wang J.
europepmc   +2 more sources