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The composition of the atmosphere at the surface of Mars
We have confirmed the discovery of N2 and 40Ar by the Entry Science Team, and we have also detected Ne, Kr, Xe, and the primordial isotopes of Ar. The noble gases exhibit an abundance pattern similarExpand
Human cell mutagenicity of oxygenated, nitrated and unsubstituted polycyclic aromatic hydrocarbons associated with urban aerosols.
Based on reported concentrations of PAC in ambient aerosols, it is possible that CPP, DB[ae]P,DB[al]P and BPK could account for a greater proportion of the mutagenicity than B[a]P in some aerosols. Expand
Measurement of Polycyclic Aromatic Hydrocarbons Associated with Size-Segregated Atmospheric Aerosols in Massachusetts
Size-segregated atmospheric aerosols were collected from urban and rural locations in Massachusetts using a micro-orifice impactor. The samples were analyzed for polycyclic aromatic hydrocarbonsExpand
The search for organic substances and inorganic volatile compounds in the surface of Mars
A total of four Martian samples, one surface and one subsurface sample at each of the two Viking landing sites, Chryse Planitia and Utopia Planitia, have been analyzed for organic compounds by a gasExpand
Measurement of Oxygenated Polycyclic Aromatic Hydrocarbons Associated with a Size-Segregated Urban Aerosol
Size-segregated atmospheric particles were collected in Boston, MA, using a micro-orifice impactor. The samples were analyzed for oxygenated polycyclic aromatic hydrocarbons (OPAH) using gasExpand
Mutagenicity of C24H14 PAH in human cells expressing CYP1A1.
The most potent mutagens were also quite toxic, and dibenzo[a,i]pyrene isomers were generally more mutagenic than the other groups of C24H14 PAH tested. Expand
Human lymphoblast mutagens in urban airborne particles
While it is known that urban airborne particles typically contain trace levels of bacterial mutagens and rodent carcinogens, little work has been done to identify chemicals in such particles that canExpand
Fullerenes C60 and C70 in flames
Spectroscopic studies reveal the presence of C60 and C70 in yields and ratios that depend on temperature, pressure, carbon/oxygen ratio and residence time in the flame, and control of these conditions allows optimal yields. Expand
Human cell mutagens in respirable airborne particles from the northeastern United States. 2. Quantification of mutagens and other organic compounds.
PAHs, PAH-ketones, and as-yet unidentified polar organic compounds are widely distributed airborne human cell mutagens, consistent with similar studies performed on airborne particles from Los Angeles and Washington, DC. Expand
Human-cell mutagens in respirable airborne particles in the northeastern United States. 1. Mutagenicity of fractionated samples.
There may be significant regional differences in the sources and/ or transport and transformation of mutagenic compounds in PM2.5, as indicated by the results of this effort to identify chemical classes responsible for the mutagenicity of samples. Expand