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Showing 1 to 20 of 32 for “"nitrous acid"”.
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Formation of Nitrous Acid on Urban Surfaces
Nitrous acid (HONO) has been observed in the nocturnal urban atmosphere for decades. During daylight hours, the rapid photolysis of HONO is a significant source of OH-radicals, which drive tropospheric chemistry and ozone-formation. Recently, unexpected high values of HONO have been detected during …
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Vertical Structure And Surface Interactions Of Nitrous Acid Using A 1D Model
This study was undertaken in order to study the vertical distribution and surface interactions of gas-phase HONO under non-ideal mixing conditions during the 2011 NACHTT campaign using the Platform for Atmospheric Chemistry and vertical Transport in One Dimension (PACT-1D) model. This work builds …
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MEASUREMENTS AND MODEL PREDICTIONS OF HYDROXYL RADICAL, PEROXY RADICALS, AND NITROUS ACID: EVIDENCE OF MISSING SOURCES OR SINKS IN FORESTED AND INDOOR ENVIRONMENTS
… a coniferous forest emphasize the importance of nitrous acid (HONO) on ROX concentrations. HONO photolyzes to iv form OH and NO, producing a substantial amount of total ROX. HONO concentrations are particularly difficult to model, as there are numerous sources of varying importance in different …
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Investigation of the Photoenhanced Reduction of Nitrogen Dioxide (NO2) on Organic Films and Above Soils as the Missing Source of Daytime Tropospheric Nitrous Acid (HONO)
… of the photoenhanced NO2 uptake reaction under acidic conditions for humic acids (HA), a ubiquitous group of environmental compounds. The linear correlation of HONO production rate with [NO2]0 (k1 = 6.7×10-3 s-1) for commercial HA suggest NO2- particles only diffuse throughout the surface layer …
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ΜΕΛΕΤΗ ΑΝΤΙΔΡΑΣΕΩΝ ΕΤΕΡΟΚΥΚΛΙΚΩΝ ΑΡΩΜΑΤΙΚΩΝ ΝΙΤΡΩΔΑΜΙΝΩΝ
… PERCHLORATE IN 0.1-4.0 N PERCHLORIC ACID IS OF FIRST ORDER IN AMINE AND NITROUS ACID AND FOLLOWS THE RATEEXPRESSION: R=K3 [AMINE] [NITROUS ACID] HO. (I) THE RESPECTIVE NITROSAMINE FORMED IS EASILY DENITROSATED UNDER THE EXPERIMENTAL CONDITIONS. THE VALUE OF K3 IS COMPATIBLE TO THAT OF …
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The Oximes of 1-(3-Methoxy-4-Agetoxyphenyl)-2, 6-Dicarbethoxycyclohex-Anedione-3,5 and their Derivatives
… group with hydroxylamine or by the reaction of nitrous acid or nitrous acid esters on compounds containing reactive methylene groups. These isonitroso compounds rearrange to oximes. |Oximes are most often used for purposes of preparing 1,2 dike to compounds. Thus the hydrolysis of Nitroso methyl …
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Structure and Metabolism of Heparin and Heparan Sulfate
… at N-sulfoglucosamine residues by treatment with nitrous acid at pH 1.5. The oligosaccharide products, primarily disaccharides and tetrasaccharides, were then end-labeled by reduction with sodium borotritide and purified to homogeneity using a combination of BioGel P-2 chromatography and strong …
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Analysis of the Structural Units of Sulfated Glycosaminoglycans by High Performance Ion Exchange Chromatography
The structural units of heparin produced by nitrous acid deamination were stoichiometrically reduced with NaB('3)H(,4) and analyzed by high performance ion exchange chromatography to obtain resolution of the four primary disaccharide units of heparin; 4-O-((beta)-D-glucopyranosyluronic …
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Ambient measurements of chemical and physical properties of organic aerosols: Insights into formation, growth, and heterogeneous chemistry
… IV presents a new pathway for the formation of nitrous acid (HONO) in the urban atmosphere.</p><p>In Chapter II, the size-resolved chemical composition of sub-micron aerosol was measured at a suburban forested site in North Carolina. Two events were identified in which particle growth, …
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Kinetics and dynamics measured using IntraCavity Laser Absorption Spectroscopy
… the second overtone of the OH stretch of trans-nitrous acid recorded between 10,230 and 10,350 cm-1. The spectra were analyzed to yield a complete set of rotational parameters and an absolute band intensity, and two groups of anharmonic perturbations were observed and analyzed. These findings …
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Structural and Metabolic Studies of Glycosaminoglycans (Sulfatase, Hydrazine, Mucopolysaccharidosis)
… residues with hydrazine (N(,2)H(,4)) followed by nitrous acid (HONO) cleavage of the polymer at pH 4.0. Initial studies with heparin-derived model compounds indicated that ester and N-sulfate substituents were stable during N(,2)H(,4) treatment but that uronic acids were converted to hydrazides …
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Studies on the Teichoic Acids of the Pneumococcus
… of segregation of the pneumococcal wall teichoic acid during cell growth and division. Teichoic acid was labeled with <sup> 3</sup>H-choline (a teichoic acid-specific constituent of pneumococci) or an analogue, and its distribution among progeny cells over several generations was followed by …
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Vertical Profiles of NO 2 and HONO in the Planetary Boundary Layer
… indication that heterogeneous formation of nitrous acid proceeds primarily at or near to the ground. During the Heidelberg measurements, daytime HONO mixing ratios exceeding 100 ppt were observed regularly, even in bright sunshine. These values are substantially higher than previously …
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A Study of the Patterns, Stoichiometry, and Kinetics of Microbial BTX Degradation Under Denitrifying Conditions by an Activated Sludge Consortium Receiving a Mixed Waste
… and the inhibitory effects of its conjugate acid, nitrous acid (HNO₂). Other evidence suggested that part of the variation was also due to a continuous acclimation and refinement towards higher affinity toluene- and m-xylene-degrading enzyme systems within the biomass.
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The Impact of Nitrite on Aerobic Growth of Paracoccus denitrificans PD1222
… is likely a result of nitrite and free nitrous acid (FNA; pKa = 3.16) and subsequent reactive nitrogen oxides, generated from the intracellular passage of FNA into P. denitrificans. A flavohemoglobin (fhb; Pd1689) and its associated NsrR family, transcriptional regulator (Pd1690), were …
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The synthesis and properties of some higher membered fused alicyclic ring systems
… undergoes the normal reaction with nitrous acid to yield derivatives of benz-cyclo-heptane. However, further attempts to apply this reaction to the synthesis of bicyclo-[0.5.5]-dodecane derivatives was abandoned because of the difficulty of preparing the required amino intermediates. …
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Integrated Modeling of Agricultural Reactive Nitrogen in the United States: Emissions, Impacts, and Mitigation Strategies
… (Nr) emissions, including nitric oxide (NO), nitrous acid (HONO), and ammonia (NH3), that damage air quality, climate, and human health. As air pollutants, NO and NH3 contribute to the formation of ozone (O3) and particulate matter (PM), with impacts that depend on spatiotemporally variable …
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Correlation of Heparan Sulfate Proteoglycan Structure and Metabolism With the Regulation of Cell Division
… tetrasaccharides formed by cleavage of HS with nitrous acid showed that the structural features of the HS in each pool were different and were altered significantly when growing cells became confluent. The nuclear HS was structurally unique and possessed a high content of sulfated glucuronic …
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Nitrosative guanosine deamination : pyrimidine ring opening implications of effects in homogeneous solution as well as anisotropic environments
… of interest has been focused on the exposure to nitrous acid (HNO2), nitric oxide (NO) and other nitrosating species because they are mutagenic agents. These mutagenic agents are known to cause two types of chemical reactions with DNA bases, deamination and interstrand cross linking involving the …
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Coupled cycling of metals with nitrogen and carbon in marine sediments
… manganese(III) and first order with respect to nitrous acid. No reversibility of reaction was observed upon addition of isotopically distinct nitrate. An inverse kinetic isotope effect of +19.9 ± 0.7‰ was calculated, which was comparable in magnitude and direction to that of biological nitrite …
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