Abstract. Highly oxygenated organic molecules (HOM) are found to play an important role in the formation and growth of secondary aerosol (SOA). SOA is type with significant impact on air quality climate. Compared oxidation volatile compounds by ozone (O3) hydroxyl radical (OH), HOM nitrate (NO3), oxidant at nighttime dawn, has received less attention. In this study, reaction isoprene NO3 was in...

Alkylperoxyl (RO2) and hydroperoxyalkyl (QOOH) species are crucial intermediates produced during the autoignition of transport fuels, consequently their thermodynamic kinetic data very important. Since these not available experimentally, we take up challenge computing them from first principles. We compare 1,5 shifts in 2-methyl-4-heptylperoxyl radical 3-methylcyclohexylperoxy to clarify simila...

Measurements of the C-H overtone transition strengths combined with estimates of the photodissociation cross sections for these transitions suggest that near-IR photodissociation of peroxy acetyl nitrate (PAN) is less significant (Jnear−IR≈3×10 s−1 at noon) in the lower atmosphere than competing sinks resulting from unimolecular decomposition and ultraviolet photolysis. This is in contrast to t...

Here, we focused on a simple enzymatic epoxidation of alkenes using lipase and phenylacetic acid. The immobilised Candida antarctica lipase B, Novozym 435 was used to catalyse the formation of peroxy acid instantly from hydrogen peroxide (H2O2) and phenylacetic acid. The peroxy phenylacetic acid generated was then utilised directly for in situ oxidation of alkenes. A variety of alkenes were oxi...

The neolignan-type substance 2,4-dimethyl-3,5-bis(4'-methoxyphenyl) tetrahydrofuran is presented as a new forensic marker compound for the peracid oxidation of anethole. It is hypothesized that the formation of a stable intermediary carbocation in the hydrolysis reaction of anethole epoxide is not only responsible for the presence of 1,2-diols (and its esters) and 4-methoxyphenyl-2-propanone (P...

Abstract. We present measurements of isoprene-derived organic nitrates (ISOP-NITs) generated in the reaction isoprene with nitrate radical (NO3) a 1 m3 Teflon chamber. Detection ISOP-NITs is achieved via their thermal dissociation to nitrogen dioxide (NO2), which monitored by cavity ring-down spectroscopy (TD-CRDS). Using inlets (TDIs) made quartz, temperature-dependent profiles (thermograms) m...

We investigated the role of singlet oxygen (generated from photoactivation of rose bengal) on the calcium transport and Ca(2+)-ATPase activity of cardiac sarcoplasmic reticulum (SR). Isolated cardiac SR exposed to rose bengal (10 nM) irradiated at 560 nm resulted in significant inhibition of Ca2+ uptake (from 2.27 +/- 0.05 to 0.62 +/- 0.05 mumol Ca2+/mg.min [mean +/- SEM], p less than 0.01) and...