Ubiquity and diversity of ammonia-oxidizing archaea in water columns and sediments of the ocean.
- C. A. Francis, K. Roberts, J. Beman, A. Santoro, B. Oakley
- Environmental ScienceProceedings of the National Academy of Sciences…
- 11 October 2005
Using PCR primers designed to specifically target archaeal amoA, AOA is found to be pervasive in areas of the ocean that are critical for the global nitrogen cycle, including the base of the euphotic zone, suboxic water columns, and estuarine and coastal sediments.
Isotopic Signature of N2O Produced by Marine Ammonia-Oxidizing Archaea
- A. Santoro, C. Buchwald, M. McIlvin, K. Casciotti
- Environmental ScienceScience
- 2 September 2011
Natural-abundance stable isotope measurements indicate that the produced N2O had bulk δ15N and δ18O values higher than observed for ammonia-oxidizing bacteria but similar to the values attributed to the oceanic N 2O source to the atmosphere.
Activity, abundance and diversity of nitrifying archaea and bacteria in the central California Current.
- A. Santoro, K. Casciotti, C. A. Francis
- Environmental ScienceEnvironmental Microbiology
- 1 July 2010
Natural abundance stable isotope ratios in nitrate (NO(3)(-)) and nitrous oxide (N(2)O) were used to evaluate the importance of nitrification over longer time scales and calculate that nitrification could produce between 0.45 and 2.93 micromol m(-2) day(-1) N( 2)O in the central California Current.
Shifts in the relative abundance of ammonia-oxidizing bacteria and archaea across physicochemical gradients in a subterranean estuary.
- A. Santoro, C. A. Francis, Nicholas R de Sieyes, A. Boehm
- Environmental ScienceEnvironmental Microbiology
- 1 April 2008
Analysis of ammonia-oxidizing enrichment cultures at a range of salinities revealed that AOA persisted solely in the freshwater enrichments where they actively express amoA, and offer new insights into the ecology of AOA and beta-AOB by elucidating conditions that may favour the numerical dominance of beta- AOB over AOA in coastal sediments.
Enrichment and characterization of ammonia-oxidizing archaea from the open ocean: phylogeny, physiology and stable isotope fractionation
- A. Santoro, K. Casciotti
- Biology, Environmental ScienceThe ISME Journal
- 1 November 2011
Three strains of pelagic ammonia-oxidizing archaea from the North Pacific Ocean that have been maintained in laboratory culture for over 3 years are reported, indicating they belong to a previously identified clade of water column-associated AOA and possess 16S ribosomal RNA genes and ammonia monooxygenase subunit a genes highly similar to those recovered in DNA and complementary DNA clone libraries from the open ocean.
Denitrifier Community Composition along a Nitrate and Salinity Gradient in a Coastal Aquifer
- A. Santoro, A. Boehm, C. A. Francis
- Environmental ScienceApplied and Environmental Microbiology
- 1 March 2006
The denitrifying community within the beach aquifer at Huntington Beach, California, is examined, finding taxonomically rich and novel communities, with all nirK clones exhibiting <85% identity and nirS clones exhibiting<92% identity at the amino acid level to those of cultivated denitRifiers and other environmental clones in the database.
Beach sands along the California coast are diffuse sources of fecal bacteria to coastal waters.
- K. Yamahara, B. Layton, A. Santoro, A. Boehm
- Environmental ScienceEnvironmental Science and Technology
- 6 June 2007
The decrease in nearshore ENT concentrations after the initial influx can be explained by ENT die-off and dilution with clean ocean water, and the presence of a putative bacterial source, degree of wave shelter, and surrounding land use explained a significant fraction of the variation in both ENT and EC densities between beaches.
Oxygen isotopic composition of nitrate and nitrite produced by nitrifying cocultures and natural marine assemblages
- C. Buchwald, A. Santoro, M. McIlvin, K. Casciotti
- Environmental Science
- 1 September 2012
The δ18O value of nitrate produced during nitrification (δ18ONO3,nit) was measured in experiments designed to mimic oceanic conditions, involving cocultures of ammonia‐oxidizing bacteria or…
Genomic and proteomic characterization of “Candidatus Nitrosopelagicus brevis”: An ammonia-oxidizing archaeon from the open ocean
- A. Santoro, C. Dupont, M. Saito
- BiologyProceedings of the National Academy of Sciences
- 13 January 2015
A closed genome assembled from a highly enriched culture of the ammonia-oxidizing pelagic thaumarchaeon CN25, originating from the open ocean, exhibits strong evidence of genome streamlining, including a 1.23-Mbp genome, a high coding density, and a low number of paralogous genes.
Interactions between fire and bark beetles in an old growth pine forest
- A. Santoro, M. Lombardero, M. Ayres, J. Ruel
- Environmental Science
- 15 April 2001
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