*  chemoautotroph tetrathiobacter kashmirensis: Topics by WorldWideScience.org
The frequent incidents of insufficient...... in the oxidation of ammonia to hydroxylamine. Thus, slow and incomplete ... ammonia-replete to ammonia-limiting conditions. Transcript levels for ammonia oxidation, CO2 fixation, and one of the ammonia ... as measured by combined ammonia and ammonium, one well above the Km for ammonia oxidation (∼500 μM) and the other well below ... ammonia oxidation) in the thaumarchaeon Nitrosopumilus maritimus SCM1 growing at two ammonia concentrations, ...
  https://worldwidescience.org/topicpages/c/chemoautotroph+tetrathiobacter+kashmirensis.html
*  Oxidative dissolution of silver nanoparticles - Wikipedia
A key step in nitrification is the oxidation of ammonia to hydroxylamine (NH2OH) catalyzed by the enzyme ammonia monooxyganase ... Arciero, D.; Vannelli, T.; Logan, M.; Hopper, A. B.Degradation of trichloroethylene by the ammonia-oxidizing bacterium ... Oxidative dissolution of AgNPs, which gives rise to Ag+, potentially inhibits nitrification within Ammonia oxidizing bacteria. ...
  https://en.wikipedia.org/wiki/Oxidative_dissolution_of_silver_nanoparticles
*  Nitrifying bacteria - Wikipedia
... necessary to obtaining energy during oxidation of ammonia to nitrite are ammonia monooxygenase (AMO) and hydroxylamine ... ammonia monooxygenase (which oxidizes ammonia to hydroxylamine), hydroxylamine oxidoreductase (which oxidizes hydroxylamine to ... First is a transmembrane copper protein which catalyzes the oxidation of ammonia to hydroxylamine (1.1) taking two electrons ... Two of the electrons are routed back to AMO, where they are used for the oxidation of ammonia (quinol pool). The remaining two ...
  https://en.wikipedia.org/wiki/Nitrifying_bacteria
*  KAKEN - Researchers | FUJIWARA Taketomo (80209121)
Journal Article] Effect of salinity on hydroxylamine oxidation in marine ammonia-oxidizing γ-proteobacterium, Nitrosococcus ... Journal Article] Effect of Salinity on Hydroxylamine Oxidation in a Marine Ammonia-Oxidizing Gammaproteobacterium, ... Journal Article] Effect of Salinity on Hydroxylanmine Oxidation in a Marine Ammonia-Oxidizing Gammaproteobacterium, ... Presentation] Ammonia monooxygenase activity of marine gamma-proteobacterium NS58 isolated from anoxic coastal sediment2008. * ...
  https://nrid.nii.ac.jp/nrid/1000080209121/
*  The reaction of monochloramine and hydroxylamine: implications for ammonia-oxidizing bacteria in chloraminated drinking water |...
... catalyzes ammonia oxidation to hydroxylamine and (2) hydroxylamine oxidoreductase catalyzes hydroxylamine oxidation to nitrite ... For biological ammonia oxidation (1st nitrification step), AOB use two enzymes in two consecutive reactions: (1) ammonia ... Because biological hydroxylamine oxidation (AOB's 2nd reaction step) supplies the electrons required for biological ammonia ... to the impact on ammonia oxidation resulting from the direct reaction of monochloramine and hydroxylamine. ...
  https://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=266544
*  Bioremediation An Advanced Strategy To Restore The Health Of Aquaculture Pond Ecosystems | The Fish Site
... and Hydroxylamine oxidoreductase (HAO) are involved in the oxidation of ammonia to nitrite. ... The nitrogen 'cycle' is the oxidation of ammonia to nitrite by bacteria of the genus Nitrosomonas and the subsequent oxidation ... Ammonia should be maintained below 0.1 mg/L (total ammonia). The most efficient way to do this is by the establishment of a ... Nitrite is formed either by the oxidation of ammonia (nitrification) or the reduction of nitrate (denitrification). Nitrite is ...
  https://thefishsite.com/articles/bioremediation-an-advanced-strategy-to-restore-the-health-of-aquaculture-pond-ecosystems
*  Publications | Microbial Ecology, University of Vienna
Abiotic processes involving the reactive ammonia-oxidation intermediates nitric oxide (NO) or hydroxylamine (NH2OH) for N2O ... For decades, ammonia and nitrite oxidation were thought to be separately catalysed by ammonia-oxidizing bacteria (AOB) and ... N. exaquare assimilates bicarbonate in association with ammonia oxidation. However, despite using inorganic carbon, the ammonia ... Nitrification, the oxidation of ammonia via nitrite to nitrate, has always been considered to be catalyzed by the concerted ...
  http://microbial-ecology.net/publications?id=1049
*  Nitrification - Wikipedia
... the first step of oxidation (ammonia to hydroxylamine) is carried out by the enzyme ammonia monooxygenase (AMO). NH 3 {\ ... The oxidation of ammonia into nitrite is performed by two groups of organisms, ammonia-oxidizing bacteria (AOB) and ammonia- ... Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate ... The process of oxidation of ammonia by AMO is regarded with importance due to the fact that other processes require the co- ...
  https://en.wikipedia.org/wiki/Nitrification
*  Hydroxylamine - Wikipedia
... the oxidation of NH3 to hydroxylamine is mediated by the enzyme ammonia monooxygenase (AMO). Hydroxylamine oxidoreductase (HAO ... further oxidizes hydroxylamine to nitrite. Hydroxylamine was first prepared as hydroxylamine hydrochloride in 1865 by the ... Cytochrome P460, an enzyme found in the ammonia-oxidizing bacteria Nitrosomonas europea, can convert hydroxylamine to nitrous ... Hydroxylamine Walters, Michael A. and Andrew B. Hoem. "Hydroxylamine." e-Encyclopedia of Reagents for Organic Synthesis. 2001. ...
  https://en.wikipedia.org/wiki/Hydroxylamine
*  Oxide Emissions
The membrane-bound ammonia mono-oxygenase enzyme (AMO) catalyses the oxidation of ammonia to hydroxylamine, and hydroxylamine ... Ammonia-oxidizing bacteria (AOB) convert ammonia to nitrite in a two-step process with hydroxylamine as an intermediate (Figure ... Nitric acid production involves the oxidation of ammonia (NH3) using a platinum catalyst (Ostwald process). Nitrous oxide forms ... Two of the four electrons derived from the oxidation of hydroxylamine to nitrite are... ...
  https://www.climate-policy-watcher.org/oxide-emissions/
*  Pactest
... and for in situ oxidation of ammonia to hydroxylamine in production of caprolactam from cyclohexanone (via the oxime). It is ... The simple complexes are moderately active in epoxidation [88], N-oxidation, alcohol oxida-tion etc, with tungsten being better ... chain oxidation system uses hydrogen peroxide and hydrogen bromide irradiated with visible light. [23], the active species ... Here, the second oxidation is slower than the first, offer-. ing a selective route to dialcohols from xylenes, for example.. ...
  http://dosingpdf.com/v/vphp.cz1.html
*  Click to print
The presence of the full suite of ammonia oxidation genes, including ammonia monooxygenase and hydroxylamine dehydrogenase, on ... for the presence of a Nitrospira-like organism with the metabolic potential to perform the complete oxidation of ammonia to ... nitrate (i.e., it is a complete ammonia oxidizer [comammox]) in a drinking water system. This metagenome bin was discovered ...
  https://www.microbe.net/2016/01/05/new-papers-january-5-2016/
*  Microbial metabolism - Wikipedia
Biochemically, ammonia oxidation occurs by the stepwise oxidation of ammonia to hydroxylamine (NH 2OH) by the enzyme ammonia ... oxidation of ammonia to nitrite (NO− 2) by nitrosifying bacteria (e.g. Nitrosomonas) and oxidation of nitrite to nitrate by the ... followed by the oxidation of hydroxylamine to nitrite by the enzyme hydroxylamine oxidoreductase in the periplasm. Electron and ... Oxygen is required in both ammonia and nitrite oxidation, meaning that both nitrosifying and nitrite-oxidizing bacteria are ...
  https://en.wikipedia.org/wiki/Microbial_metabolism
*  Hydroxylammonium chloride - Wikipedia
Hydroxylamine is a biological intermediate in the nitrification (biological oxidation of ammonia with oxygen into nitrite) and ... Hydroxylammonium chloride is the hydrochloric acid salt of hydroxylamine. ... in the anammox (biological oxidation of nitrite and ammonium into dinitrogen gas) which are important in the nitrogen cycle in ...
  https://en.wikipedia.org/wiki/Hydroxylammonium_chloride
*  Publications | Microbial Ecology, University of Vienna
Abiotic processes involving the reactive ammonia-oxidation intermediates nitric oxide (NO) or hydroxylamine (NH2OH) for N2O ... For decades, ammonia and nitrite oxidation were thought to be separately catalysed by ammonia-oxidizing bacteria (AOB) and ... N. exaquare assimilates bicarbonate in association with ammonia oxidation. However, despite using inorganic carbon, the ammonia ... Nitrification, the oxidation of ammonia (NH3) via nitrite (NO2(-)) to nitrate (NO3(-)), is a key process of the biogeochemical ...
  http://dome.csb.univie.ac.at/publications?id=1084
*  Genome-Enabled Insights into the Ecophysiology of the Comammox Bacterium "Candidatus Nitrospira nitrosa" | mSystems
... and hydroxylamine dehydrogenase (haoAB-cycAB) gene clusters, responsible for oxidation of ammonia to nitrite (Table S3), ... The first step, oxidation of ammonia to nitrite, is performed by ammonia-oxidizing bacteria (AOB) or archaea (AOA), and the ... strain Ga0074138 [1-3]) contain the genes necessary for ammonia and nitrite oxidation, suggesting that Nitrospira bacteria are ... 3). Consistent with this phylogeny, UW-LDO-01 harbored the amoCAB operon, responsible for ammonia oxidation, while UW-LDO-02 ...
  http://msystems.asm.org/content/2/5/e00059-17
*  Earth's Internet & Natural Networking: November 2015
There, ammonia is oxidized to chloramine (NH2Cl, nitrogen oxidation number −I, like in hydroxylamine), which then undergoes ... the inert N2 has to be converted to ammonia (oxidation number −III), which can then be assimilated to produce organic nitrogen ... "Anaerobic ammonium oxidation (anammox) has a major role in the Earth's nitrogen cycle and is used in energy-efficient ... reduction of nitric oxide to hydroxylamine at the active site of the γ-subunit and its subsequent condensation with ammonia, ...
  http://creating-a-new-earth.blogspot.se/2015_11_01_archive.html
*  Carbonyl group - Wikipedia
... and then to acetals and ketals Reaction with ammonia and primary amines to form imines Reaction with hydroxylamines to form ... oximes Reaction with cyanide anion to form cyanohydrins Oxidation with oxaziridines to acyloins Reaction with Tebbe's reagent ... the lone pair electrons of nitrogen in the ammonia molecule). During the reaction, the carbon-oxygen double bond is broken, and ...
  https://en.wikipedia.org/wiki/Carbonyl_group
*  Nitrogen Fixation
Ammonia Oxidation Pathway Sun, 10 Jul 2016 , Nitrogen Fixation The oxidation of NH3 to NO2 is carried out in two steps (Figure ... by ammonia monooxygenase (AMO). NH2OH is subsequently oxidized to NO2 by hydroxylamine oxidoreductase (HAO). In the reaction ... Moreover, aldose oxidation through GDH allows N2-fixing A. diazotrophicus to direct the electron flux through a more efficient ... this volume). In this bacterium, a double glnB-glnK mutant escapes ammonia control both at the level of the synthesis of ...
  https://www.climate-policy-watcher.org/nitrogen-fixation/
*  Nitrite reductase - Wikipedia
The oxidation of iron from Fe(II) to Fe(III), coupled with a further protonation of nitrogen leads to the release of ammonia. ... The nitrite is immediately reduced to ammonia (probably via hydroxylamine) by the activity of nitrite reductase. The term ... The active site of the enzyme contains an iron in a +2 oxidation state. The oxidation level allows nitrite to bond more ... The resulting intermediate is a hydroxylamine. further protonation of the hydroxylamine leads to the breakage of the N-O bond ...
  https://en.wikipedia.org/wiki/Nitrite_reductase
*  Nitrous oxide - Wikipedia
Direct oxidation of ammonia with a manganese dioxide-bismuth oxide catalyst has been reported: cf. Ostwald process. 2 NH 3 + 2 ... If the nitrite is added to the hydroxylamine solution, the only remaining by-product is salt water. If the hydroxylamine ... Specifically, they include: aerobic autotrophic nitrification, the stepwise oxidation of ammonia (NH 3) to nitrite (NO− 2) and ... "Synthesis of Nitrous Oxide by Oxidation of Ammonia". Kohyo Kagaku Zasshi, Showa Denka Ltd. 64: 1879-1888. Egon Wiberg, Arnold ...
  https://en.wikipedia.org/wiki/Nitrous_oxide
*  Nitrogen Cycles Project: 4. Nitrogen Properties
Nitrogen Species and their Oxidation States Species. Name. Oxidation State. NH3, NH4+ Ammonia, ammonium ion -3. ... Hydroxylamine. -1. N2. Nitrogen. 0. N2O. Nitrous oxide. +1. ... The valence range (oxidation states) of N is full: going from ... and ammonia (NH3). Most organic N species in the four spheres are biomolecules, such as proteins, peptides, enzymes, and ...
  http://www.sws.uiuc.edu/nitro/nitrodesc.asp
*  astrophytum myriostigma lemaire: Topics by WorldWideScience.org
ApJL.2012] or the simple oxidation of ammonia [He, Vidali, Lemaire & Garrod, ApJ, 2015] or the reaction of ammonia with ... I review recent experimental work showing that hydroxylamine (NH2OH) could be formed either by surface or by volume reactions ... shows that the results of ammonia oxidation we obtain are plausible by surface/volume reactions.Although none of the ... They use either electron-UV irradiation of water-ammonia ices [Zheng & Kaiser JCPA 2010] or successive hydrogenation of solid ...
  https://worldwidescience.org/topicpages/a/astrophytum+myriostigma+lemaire.html
*  Literature Archives @ B.R.S.M.
... derived from Anaerobic Ammonia Oxidation) bacteria. These tiny guys oxidize ammonia and nitrite ions to liberate nitrogen gas ... dense enough to keep hydroxylamine and hydrazine at bay; hence avoiding their diffusion into the cytoplasm and preventing ... And you can remember its oxidation potential, right? Versus the Saturated Calomel Electrode? In the Ir(iii)* excited state and ... and water, but during this conversion they produce hydroxylamine and hydrazine; two very damaging and membrane permeable ...
  http://brsmblog.com/category/literature/
*  Guest Post: Pentacycloanammoxic Acid - B.R.S.M.
... derived from Anaerobic Ammonia Oxidation) bacteria. These tiny guys oxidize ammonia and nitrite ions to liberate nitrogen gas ... dense enough to keep hydroxylamine and hydrazine at bay; hence avoiding their diffusion into the cytoplasm and preventing ... This combination of hetero-Diels-Alder/oxidation/photolysis is exploited by many authors time and time again to form strained C ... and water, but during this conversion they produce hydroxylamine and hydrazine; two very damaging and membrane permeable ...
  http://brsmblog.com/pentacycloanammoxic-acid/