A5066581613- Nitric Oxide and Endothelin Effects
- Education Systems and Policy
- Hemoglobin structure and function
- Parental Involvement in Education
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- Inorganic and Organometallic Chemistry
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- Chemical Reaction Mechanisms
- Metal Extraction and Bioleaching
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- Heme Oxygenase-1 and Carbon Monoxide
- Ammonia Synthesis and Nitrogen Reduction
- Dark Matter and Cosmic Phenomena
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- Sulfur Compounds in Biology
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Max Planck Institute for Physics
2023-2024
Ollscoil na Gaillimhe – University of Galway
2001-2022
University of Edinburgh
1979-2022
Deleted Institution
2022
Institute of Technology Assessment
2018
National University of Ireland
2003-2011
Safe Work Australia
2011
University College London
2008-2009
University of Bristol
1999-2007
King's College London
1996-2006
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The kinetics of decomposition pernitrite in excess alkali have been studies at several temperatures. These show that occurs through the pernitrous acid molecule, HO·ONO, with ΔH‡= 12·5 kcal. mole–1 and ΔS‡= 26 e.u. value ΔH‡ is not consistent accepted view decomposes via homolytic fission O–O link. This problem discussed other, non-homolytic, mechanisms suggested. An upper limit for pKA 2° 8·3 has calculated. first isolation a solid reported. extinction coefficient anion 302 mµ(λmax.)...
The functions of metals in microorganisms metal nutrition - the supply and analysis mocrobial cultures transport IA IIA cations special roles for transition elements zinc toxicity metals, biotechnology.
Escherichia coli possesses a soluble flavohemoglobin, with an unknown function, encoded by the hmp gene. A monolysogen containing hmp-lacZ operon fusion was constructed to determine how promoter is regulated in response heme ligands (O2, NO) or presence of anaerobically utilized electron acceptors (nitrate, nitrite). Expression phi (hmp-lacZ)1 similar during aerobic growth minimal medium glucose, glycerol, maltose, sorbitol as carbon source. Mutations cya (encoding adenylate cyclase) changes...
Bilirubin (BR) and biliverdin (BV), two metabolites produced during haem degradation by oxygenase, possess strong antioxidant activities toward peroxyl radical, hydroxyl radical hydrogen peroxide. Considering the importance attributed to nitric oxide (NO) its congeners in control of physiological pathophysiological processes, we examined interaction BR BV with NO NO‐related species vitro. Exposure agents that release or nitroxyl resulted a concentration‐ time‐dependent loss BV, as assessed...
When five-and seven-year old children were presented with questions intended to be bizarre (in the sense that their meaning required clarification, or further information beyond provided was for an answer), almost invariably gave replies. The older more likely do so by making of through characteristics elements referred to, rules might expected apply in situations to; younger make importing additional context. Older also indicate uncertainty about qualifying responses some way.
Sodium iodide (NaI)-based cryogenic scintillating calorimeters using quantum sensors for signal readout have shown promising first results toward a model-independent test of the annually modulating detected by DAMA/LIBRA dark matter experiment. The COSINUS Collaboration has previously reported on above-ground measurements dual-channel phonons and light based transition edge (TESs) that allows particle discrimination an event-by-event basis. In this article, we outline underground measurement...
A transposon (Tn 10 dCam) insertion mutant of Escherichia coli K‐12 was isolated that exhibited hypersensitivity to zinc(II) and cadmium(II) and, a lesser extent, cobalt(II) nickel (II). The mutated gene, located between 75.5 76.2 min on the chromosome, is named zntA (for Zn(II) transport or tolerance). metal‐sensitive phenotype complemented by genomic DNA clone mapping at 3677.90–3684.60 kb physical map. Insertion kanamycin resistance (Kn R ) cassette Sal I site in subcloned fragment...
Respiration of <i>Escherichia coli</i>catalyzed either by cytochrome <i>bo</i>′ or <i>bd</i> is sensitive to micromolar extracellular NO; extensive, transient inhibition respiration increases as dissolved oxygen tension in the medium decreases. At low concentrations (25–33 μm), duration 9 μm NO increased mutation oxidase. an <i>hmp</i> mutant defective flavohemoglobin (Hmp) synthesis extremely NO-sensitive (I<sub>50</sub> about 0.8 μm); conversely, cells pre-grown with sodium nitroprusside...
The flavohaemoglobin Hmp of Escherichia coli is inducible by nitric oxide (NO) and provides protection both aerobically anaerobically from inhibition growth NO agents that cause nitrosative stress. Here we report rapid kinetic studies binding to Fe(III) with a second order rate constant 7.5×10 5 M −1 s generate nitrosyl adduct was stable anoxically but decayed in the presence air reform protein. displaced CO bound dithionite‐reduced but, remarkably, recombined after only 2 at room...
Nitric oxide and nitrosating agents exert powerful antimicrobial effects are central to host defense signal transduction. S-nitrosothiols can be metabolized by bacteria, but only a few enzymes have been shown important in responses such stresses. Glycerol-limited chemostat cultures defined medium of Escherichia coli MG1655 were used provide bacteria physiological states before applying nitrosative stress addition S-nitrosoglutathione (GSNO). Exposure 200 microm GSNO for 5 min was sufficient...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of the nitrogen-nitrogen double bond in trioxodinitrate: reaction between triplet oxonitrate(1-) and molecular oxygen to form peroxonitriteCaroline E. Donald, Martin N. Hughes, Janet M. Thompson, Francis T. BonnerCite this: Inorg. Chem. 1986, 25, 16, 2676–2677Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July...
The autoxidation of hydroxylamine in aqueous alkali is shown to proceed by attack oxygen on a deprotonated species yielding nitroxyl ion which can be oxidised further peroxonitrite. In the presence metal sequestering agent (edta) peroxonitrite stabilised, although isomerising slowly nitrate. A little nitrite also formed. Decrease pH leads increasing production gaseous products. catalytic ions, main product, being largely consumed via reaction with Increasing concentration copper(II) ions...