Publications by authors named "P Veres"
Article Synopsis
- The decline in vehicle emissions highlights the increasing role of Volatile Organic Compounds (VOCs) from Volatile Chemical Products (VCP), but their complex chemistry poses challenges for accurate modeling.
- Researchers developed a new chemical mechanism called RACM2B-VCP to better represent VOC emissions from VCP sources, specifically in urban settings like Los Angeles.
- Model evaluations show promising results, indicating that over 50% of anthropogenic VOC reactivity and ozone enhancement in the area is linked to VCP emissions, despite some remaining discrepancies in the model's overall VOC reactivity predictions.
The intramolecular hydrogen-shift rate coefficient of the CHSCHO (methylthiomethylperoxy, MSP) radical, a product formed in the oxidation of dimethyl sulfide (DMS), was measured using a pulsed laser photolysis flow tube reactor coupled to a high-resolution time-of-flight chemical ionization mass spectrometer that measured the formation of the DMS degradation end product HOOCHSCHO (hydroperoxymethyl thioformate). Measurements performed over the temperature range of 314-433 K yielded a hydrogen-shift rate coefficient of () = (2.39 ± 0.
View Article and Find Full Text PDFLiposomes carry various compounds with applications in pharmaceutical, food, and cosmetic fields, and the administration route is especially parenteral, oral, or transdermal. Liposomes are used to preserve and release the internal components, thus maintaining the properties of the compounds, the stability and shelf life of the encapsulated products, and their functional benefits. The main problem in obtaining liposomes at the industrial level is their low stability due to fragile phospholipid membranes.
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- The study reveals high levels of hydrochloric acid (HCl) and halogens (Cl, Br, and BrCl) in an industrial plume near the Great Salt Lake, Utah, highlighting a significant environmental concern.
- Complete oxygen depletion was linked to the production of halogen radicals, correlating with reported emissions from nearby facilities for chlorine and HCl, but bromine levels were estimated based on unreported inventory data.
- A photochemical model demonstrated that bromine radicals were the primary cause of rapid oxygen depletion, and including halogen emissions in environmental models indicated a 10%-25% increase in particulate matter in the Great Salt Lake Basin, exacerbating air quality problems in the region.
Gas phase hydrogen chloride (HCl) was measured at Pasadena and San Joaquin Valley (SJV) ground sites in California during May and June 2010 as part of the CalNex study. Observed mixing ratios were on average 0.83 ppbv at Pasadena, ranging from below detection limit (0.
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