Optical Absorptivity versus Molecular Composition of Model Organic Aerosol Matter (2009)
Rincón, Angela G., Guzmán, Marcelo I., Hoffmann, Michael R., Colussi, A. J.
Aerosol particles affect the Earth’s energy balance by absorbing and scattering radiation according to their chemical composition, size, and shape. It is generally believed that their optical...
Enrichment Factors of Perfluoroalkyl Oxoanions at the Air/Water Interface (2009)
Psillakis, Elefteria, Cheng, Jie, Hoffmann, M. R., Colussi, A. J.
The refractory, water-bound perfluoro-n-alkyl carboxylate F(CF_2)_nCO_2^− and sulfonate F(CF_2)_nSO_3^− surfactant anions reach remote locations by mechanisms that are not well understood. Here...
Cheng, Jie, Psillakis, Elefteria, Hoffmann, M. R., Colussi, A. J.
Perfluorooctanoate (PFO) and perfluorooctanesulfonate (PFOS) surfactant anions, once released, may rapidly reach remote regions. This phenomenon is puzzling because the water-bound anions of strong...
Enami, Shinichi, Hoffmann, M. R., Colussi, A. J.
Sulfenic acids (RSOH) are reactive intermediates in the oxidation of protein cysteines. Among cysteine oxoforms, RSOH represent redox-reversible species that can thus participate in regulation and...
How Phenol and α-Tocopherol React with Ambient Ozone at Gas/Liquid Interfaces (2009)
Enami, Shinichi, Hoffmann, Michael R., Colussi, A. J.
The exceptional ability of α-tocopherol (α-TOH) for scavenging free radicals is believed to also underlie its protective functions in respiratory epithelia. Phenols, however, can scavenge other...
Absorption of Inhaled NO2 (2009)
Enami, Shinichi, Hoffmann, Michael R., Colussi, A. J.
Nitrogen dioxide (NO_2), a sparingly water-soluble π-radical gas, is a criteria air pollutant that induces adverse health effects. How is inhaled NO_2(g) incorporated into the fluid microfilms...
Anion-Catalyzed Dissolution of NO_2 on Aqueous Microdroplets (2009)
Yabushita, A., Enami, S., Sakamoto, Y., Kawasaki, M., Hoffmann, M. R., Colussi, A. J.
Fifty-seven years after NOx (NO + NO_2) were identified as essential components of photochemical smog, atmospheric chemical models fail to correctly predict •OH/HO_2• concentrations under...
Ozone Oxidizes Glutathione to a Sulfonic Acid (2009)
Enami, Shinichi, Hoffmann, M. R., Colussi, A. J.
Biosurfaces are universally covered with fluid microfilms containing reduced glutathione (GSH) and other antioxidants whose putative roles include the detoxification of ambient ozone (O_3). It is...
R.: Photoinduced oligomerization of aqueous pyruvic acid (2008)
M. I. Guzmán, A. J. Colussi, M. R. Hoffmann
The 320 nm-band photodecarboxylation of aqueous pyruvic acid (PA), a representative of the R-oxocarboxylic acids widely found in the atmospheric aerosol, yields 2,3-dimethyltartaric (A) and...
Click Here for Full Article Photolysis of pyruvic acid in ice: Possible relevance to (2008)
M. I. Guzmán, M. R. Hoffmann, A. J. Colussi
[1] The abnormal spikes detected in some CO and CO2 polar ice core records indicate persistent chemical activity in glacial ice. Since CO and CO2 spikes are correlated, and their amplitudes scale...
Enami, Shinichi, Hoffmann, M. R., Colussi, A. J.
The pulmonary epithelium, like most aerial biosurfaces, is naturally protected against atmospheric ozone (O3) by fluid films that contain ascorbic acid (AH2) and related scavengers. This mechanism of...
Acidity of Frozen Electrolyte Solutions (2006)
Carmen Robinson, C. S. Boxe, M. I. Guzmán, A. J. Colussi, M. R. Hoffmann
Ice is selectively intolerant to impurities. A preponderance of implanted anions or cations generates electrical
Photogeneration of Distant Radical Pairs in Aqueous Pyruvic Acid Glasses (2005)
Marcelo I. Guzmán, A. J. Colussi, Michael R. Hoffmann
The λ> 300 nm photolysis of h4-ord4-pyruvic acid aqueous glasses at 77 K yields identical electron magnetic resonance (EMR) spectra arising from distant (r J 0.5 nm) triplet radical pairs....
Acidity enhances the formation of a persistent ozonide at aqueous ascorbate/ozone gas interfaces
Enami, Shinichi, Hoffmann, M. R., Colussi, A. J.
The pulmonary epithelium, like most aerial biosurfaces, is naturally protected against atmospheric ozone (O3) by fluid films that contain ascorbic acid (AH2) and related scavengers. This mechanism of...