Results 11 to 20 of about 6,257 (199)

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

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

Increased expression of bacterial amoA during an N2O emission peak in an agricultural field

Agriculture, Ecosystems & Environment, 2017
peer reviewedLevels of N-cycle gene transcripts (nirK, nirS, nosZ, amoA) were measured during an N2O emission peak in an agricultural soil. Automated dynamic closed chambers were used to monitor an N2O emission peak on a maize crop after a natural ...
Regaert, Donat, Heinesch, Bernard, Bodson, Bernard, Aubinet, Marc, Vandenbol, Micheline, Lognoul, Margaux, Theodorakopoulos, Nicolas, Degrune, Florine, Muys, Céline, Broux, François   +9 more
core   +3 more sources

Retraction Note to: Archaeal amoA Genes Outnumber Bacterial amoA Genes in Municipal Wastewater Treatment Plants in Bangkok [PDF]

Microbial Ecology, 2016
The contribution of ammonia-oxidizing archaea (AOA) to nitrogen removal in wastewater treatment plants (WWTPs) remains unknown. This study investigated the abundance of archaeal (AOA) and bacterial (ammonia-oxidizing bacteria (AOB)) amoA genes in eight of Bangkok’s municipal WWTPs.
Pantip, Kayee, Puntipar, Sonthiphand, Chaiwat, Rongsayamanont, Tawan, Limpiyakorn   +3 more
openaire   +3 more sources

Temperature responses of ammonia-oxidizing prokaryotes in freshwater sediment microcosms. [PDF]

PLoS ONE, 2014
In order to investigate the effects of temperature on the abundances and community compositions of ammonia-oxidizing archaea (AOA) and bacteria (AOB), lake microcosms were constructed and incubated at 15°C, 25°C and 35°C for 40 days, respectively ...
Jin Zeng, Dayong Zhao, Zhongbo Yu, Rui Huang, Qinglong L Wu   +4 more
doaj   +1 more source

Aquarium nitrification revisited: Thaumarchaeota are the dominant ammonia oxidizers in freshwater aquarium biofilters. [PDF]

PLoS ONE, 2011
Ammonia-oxidizing archaea (AOA) outnumber ammonia-oxidizing bacteria (AOB) in many terrestrial and aquatic environments. Although nitrification is the primary function of aquarium biofilters, very few studies have investigated the microorganisms ...
Laura A Sauder, Katja Engel, Jennifer C Stearns, Andre P Masella, Richard Pawliszyn, Josh D Neufeld   +5 more
doaj   +1 more source

Nitrogen Significantly Affected N Cycling Functional Gene Abundances Compared with Phosphorus and Drought in an Alpine Meadow

Agronomy, 2023
Human activities and global climate change have greatly increased nitrogen (N) and phosphorus (P) inputs and altered precipitation patterns in alpine meadows.
Haiyan Li, Jiaqi Zhang, Dashuan Tian, Yinghui Liu, Jingyi Dong   +4 more
doaj   +1 more source