scholarly journals A Free-Radical Pathway to Hydrogenated Phenanthrene in Molecular Clouds-Low Temperature Growth of Polycyclic Aromatic Hydrocarbons

ChemPhysChem ◽  
2017 ◽  
Vol 18 (15) ◽  
pp. 1971-1976 ◽  
Author(s):  
Aaron M. Thomas ◽  
Michael Lucas ◽  
Tao Yang ◽  
Ralf I. Kaiser ◽  
Luis Fuentes ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Free Radical ◽  
Low Temperature ◽  
Aromatic Hydrocarbons ◽  
Molecular Clouds ◽  
Temperature Growth ◽  
Low Temperature Growth ◽  
Polycyclic Aromatic

scholarly journals LOW TEMPERATURE FORMATION OF NITROGEN-SUBSTITUTED POLYCYCLIC AROMATIC HYDROCARBONS (PANHs)—BARRIERLESS ROUTES TO DIHYDRO(iso)QUINOLINES

2015 ◽  
Vol 815 (2) ◽  
pp. 115 ◽  
Author(s):  
Dorian S. N. Parker ◽  
Tao Yang ◽  
Beni B. Dangi ◽  
Ralf. I. Kaiser ◽  
Partha P. Bera ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Low Temperature ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic

scholarly journals Degradation of Polycyclic Aromatic Hydrocarbons at Low Temperature under Aerobic and Nitrate-Reducing Conditions in Enrichment Cultures from Northern Soils

2003 ◽  
Vol 69 (1) ◽  
pp. 275-284 ◽  
Author(s):  
Mikael Eriksson ◽  
Erik Sodersten ◽  
Zhongtang Yu ◽  
Gunnel Dalhammar ◽  
William W. Mohn
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Low Temperature ◽  
Aromatic Hydrocarbons ◽  
Intergenic Spacer ◽  
Aerobic Conditions ◽  
Enrichment Cultures ◽  
Pah Degradation ◽  
Reducing Conditions ◽  
Arctic Soil ◽  
Polycyclic Aromatic

ABSTRACT Thepotential for biodegradation of polycyclic aromatic hydrocarbons (PAHs)at low temperature and under anaerobic conditions is not wellunderstood, but such biodegradation would be very useful forremediation of polluted sites. Biodegradation of a mixture of 11different PAHs with two to five aromatic rings, each at a concentrationof 10 μg/ml, was studied in enrichment cultures inoculated withsamples of four northern soils. Under aerobic conditions, lowtemperature severely limited PAH biodegradation. After 90 days, aerobiccultures at 20°C removed 52 to 88% of the PAHs. The mostextensive PAH degradation under aerobic conditions at 7°C,53% removal, occurred in a culture from creosote-contaminatedsoil. Low temperature did not substantially limit PAH biodegradationunder nitrate-reducing conditions. Under nitrate-reducing conditions,naphthalene, 2-methylnaphthalene, fluorene, and phenanthrene weredegraded. The most extensive PAH degradation under nitrate-reducingconditions at 7°C, 39% removal, occurred in a culturefrom fuel-contaminated Arctic soil. In separate transfer cultures fromthe above Arctic soil, incubated anaerobically at 7°C, removalof 2-methylnaphthalene and fluorene was stoichiometrically coupled tonitrate removal. Ribosomal intergenic spacer analysis suggested thatenrichment resulted in a few predominant bacterial populations,including members of the genera Acidovorax,Bordetella, Pseudomonas, Sphingomonas, andVariovorax. Predominant populations from different soils oftenincluded phylotypes with nearly identical partial 16S rRNA genesequences (i.e., same genus) but never included phylotypes withidentical ribosomal intergenic spacers (i.e., different species orsubspecies). The composition of the enriched communities appeared to bemore affected by presence of oxygen, than by temperature or source oftheinoculum.

Photoirradiation of representative polycyclic aromatic hydrocarbons and twelve isomeric methylbenz[a]anthracene with UVA light: formation of lipid peroxidation

2006 ◽  
Vol 22 (4) ◽  
pp. 147-156 ◽  
Author(s):  
Qingsu Xia ◽  
Ming W Chou ◽  
Jun J Yin ◽  
Paul C Howard ◽  
Hongtao Yu ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Free Radical ◽  
Methyl Linoleate ◽  
Aromatic Hydrocarbons ◽  
Lipid Peroxide ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Uva Light ◽  
Polycyclic Aromatic

Polycyclic aromatic hydrocarbons (PAHs) are widespread genotoxic environmental pollutants, which require metabolic activation in order to exert biological activities, including mutagenicity and carcinogenicity. Photoactivation is another activation pathway that can lead to PAH genotoxicity. In this paper, we demonstrate that photoirradiation of a series of representative PAHs, with and without bearing a methyl substituent, with UVA light in the presence of methyl linoleate resulted in the formation of methyl linoleate hydroperoxides (a lipid peroxide). The lipid peroxide formation was inhibited by dithiothreitol (DTT) (free radical scavenger), NaN3 (singlet oxygen and free radical scavenger), and superoxide dismutase (SOD) (superoxide scavenger), but was enhanced by the presence of deuterium oxide (D2O) (extends singlet oxygen lifetime). These results suggest that photoirradiation of PAHs by UVA light generates reactive oxygen species (ROS), which induce lipid peroxidation.

Low temperature electron attachment to polycyclic aromatic hydrocarbons

1998 ◽  
Vol 109 ◽  
pp. 71-82 ◽  
Author(s):  
Toufik Moustefaoui ◽  
Christiane Rebrion-Rowe ◽  
Jean-Luc Le Garrec ◽  
C—Bertrand R. Rowe ◽  
J. Brian A. Mitchell
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Low Temperature ◽  
Aromatic Hydrocarbons ◽  
Electron Attachment ◽  
Polycyclic Aromatic ◽  
Temperature Electron
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