1. Enzyme systems from Cucurbita pepo have been shown to catalyse the reduction of nitrite and hydroxylamine to ammonia in yields about 90-100%. 2. Reduced benzyl viologen serves as an efficient electron donor for both systems. Activity of the nitrite-reductase system is directly related to degree of dye reduction when expressed in terms of the function for oxidation-reduction potentials, but a...

the beta0diketone derivatives of nitroimidazole were synthesized from the reaction of magnesium salt of beta-ketoaccids 3 with imidazolide 4. the raction of beta-diketones with hydroxylamine hydrochloride afforded either the isoxazoles or the 5-hydroxyl-2-isoxazolines.

Microbial electricity-driven anoxic ammonium removal could remove from wastewater without the presence of oxygen (aeration) using electricity. This study aims at unveiling potential biologic pathways for bioelectrochemical oxidation to dinitrogen gas in an anaerobic system (BES). Known intermediate metabolites this process (hydroxylamine, nitrite and nitrate) were monitored two BES replicates. ...

In the course of investigations regarding the effects of various chemical agents on neoplast,ic purine metabolism, it was observed that hydroxylamine prevents the accumulation of uric acid or allantoin that normally occurs upon incubation of crude tissue homogenates. Subsequent studies, reported in this paper, demonstrate that hydroxylamine is a competitive inhibitor of xanthine oxidase activit...

An iron-catalyzed diastereoselective intermolecular olefin amino-oxygenation reaction is reported, which proceeds via an iron-nitrenoid generated by the N-O bond cleavage of a functionalized hydroxylamine. In this reaction, a bench-stable hydroxylamine derivative is used as the amination reagent and oxidant. This method tolerates a range of synthetically valuable substrates that have been all i...

H NMR of two H2@C60 nitroxide derivatives has been characterized indirectly by reducing to their corresponding hydroxylamines. Nuclear spin relaxation of the endohedral H2 and external protons of the H2@C60 nitroxide and its corresponding hydroxylamine were measured and analyzed. The observed spectra are consistent with negligible scalar coupling between the unpaired electron and the endo-H2. A...

Light activated rhodopsin interacts with domains on all three subunits of transducin. Two of these domains, the C-terminal regions of the alpha and gamma subunits mimic the ability of transducin to stabilize the active conformation of rhodopsin, metarhodopsin II, but display different roles in transducin activation process. Whether the interactions are with the same or different complimentary s...

The enzyme system catalyzing this has been termed “glutamine synthetase” and for convenience this name will be used here. Ammonia in this reaction can be replaced by hydrasine or hydroxylamine, all three bases reacting at the same rate (4). All organic bases and amino acids tested have been found to be inactive. With hydroxylamine, a hydroxamic acid is produced, estimation of which provides a c...

Nitric oxide is an important molecule in all domains of life with significant biological functions in both pro- and eukaryotes. Anaerobic ammonium-oxidizing (anammox) bacteria that contribute substantially to the release of fixed nitrogen into the atmosphere use the oxidizing power of NO to activate inert ammonium into hydrazine (N2H4). Here, we describe an enzyme from the anammox bacterium Kue...

Generation rates of superoxide anions (O2-) by autoxidizing adrenalin at pH 9.5 were determined in solutions containing either superoxide dismutase (0.85 M-1 S-1) or hydroxylamine (0.0185 M-1 S-1) as competitive scavengers. The rate constants of O2- with adrenalin and hydroxylamine were calculated for neutral and alkaline solutions. The respective values were for adrenalin: 5.6 X 10(4) M-1 S-1,...