scholarly journals Microbial biodegradation of polyaromatic hydrocarbons

2008 ◽  
Vol 32 (6) ◽  
pp. 927-955 ◽  
Author(s):  
Ri-He Peng ◽  
Ai-Sheng Xiong ◽  
Yong Xue ◽  
Xiao-Yan Fu ◽  
Feng Gao ◽  
...  
Keyword(s):  
Polyaromatic Hydrocarbons ◽  
Microbial Biodegradation

scholarly journals 2.2-Diphenic Acid: A Reliable Biomarker Of Phenanthrene Biodegradation

2021 ◽  
Author(s):  
Emmanuel Fenibo
Keyword(s):  
Salicylic Acid ◽  
Polyaromatic Hydrocarbons ◽  
Sole Source ◽  
Intermediary Metabolites ◽  
Phenanthrene Degradation ◽  
Equivalent Position ◽  
Diphenic Acid ◽  
Microbial Biodegradation ◽  
Bacteria And Fungi ◽  
Phenanthrene Biodegradation

Phenanthrene is among the 16 priority pollutant and its mitigation in the environment has been a global concern. It serves as a model compound when it comes to biodgradation study of polyaromatic hydrocarbons (PAHs) because it has both the Bay- and K-region found in most PAH pollutants. Like other PAH pollutants, different means are available for its remediation in the environment, including microbial biodegradation. Diverse species of bacteria and fungi metabolize phenanthrenes as their sole source of carbon and energy. However, bacteria are more diverse in comparison to fungi. This has been shown in published pathways of phenanthrene biodegradation implicating various intermediary metabolites, including 2,2-diphenic acid, which is a downline metabolite of 9,10-dihydroxyphenanthrene. Though the 2,2-diphenic acid has been widely demonstrated to produce carbon (iv) oxide and linked to phthalate, only few has traced salicylic acid as its downstream molecule. 2,2-diphenic acid mounts equivalent position to 1-hydroxy-2-naphthoic acid, metabolite that ends the phenanthrene metabolic pathway. This is because they both produce phthalic acid and salicylic acid. As a product of bacteria and fungi during phenanthrene degradation, 2,2-diphenic acid can serve as a dependable biomarker of phenanthrene metabolism in a polluted habitat, where microbial community exist freely.

In the Quest for a Stable Triplet State in Small Polyaromatic Hydrocarbons : An In-Silico Tool for Rational Design and Prediction

2019 ◽  
Author(s):  
Madhumita Rano ◽  
Sumanta K Ghosh ◽  
Debashree Ghosh
Keyword(s):  
Triplet State ◽  
Small Molecules ◽  
In Silico ◽  
Qualitative Agreement ◽  
Rational Design ◽  
Polyaromatic Hydrocarbons ◽  
Spin Hamiltonian ◽  
Spin Frustration ◽  
Computationally Efficient ◽  
High Level

<div>Combining the roles of spin frustration and geometry of odd and even numbered rings in polyaromatic hydrocarbons (PAHs), we design small molecules that show exceedingly small singlet-triplet gaps and stable triplet ground states. Furthermore, a computationally efficient protocol with a model spin Hamiltonian is shown to be capable of qualitative agreement with respect to high level multireference calculations and therefore, can be used for fast molecular discovery and screening.</div>

The use of catalytic additives for hydrogenation of polyaromatic hydrocarbons

2020 ◽  
Vol 31 ◽  
pp. 611-614
Author(s):  
Darzhan Aitbekova ◽  
Araigul Bakytkyzy ◽  
Gulzhan Baikenova ◽  
Murzabek Baikenov
Keyword(s):  
Polyaromatic Hydrocarbons ◽  
Catalytic Additives

Selanyl and tellanyl electrophiles as a driving force in the construction of sophisticated polyaromatic hydrocarbons

2021 ◽  
Vol 45 (16) ◽  
pp. 7247-7255
Author(s):  
Pavel Arsenyan ◽  
Alla Petrenko ◽  
Sergey Belyakov
Keyword(s):  
Driving Force ◽  
Polyaromatic Hydrocarbons ◽  
Aromatic Rings ◽  
Carbazole Derivatives

Herein, we report the first examples of N-polyaromatic compounds bearing up to 13 fused aromatic rings, including 23H-benzo[12,1]tetrapheno[8,9-b]benzo[12,1]tetrapheno[9,8-h]carbazole derivatives.

The sediment of the Hostivar Reservoir (Prague, Czech Republic) as a memory of 45 years of pollution

2017 ◽  
Vol 28 (2) ◽  
pp. 204-213
Author(s):  
Lucie Soucková ◽  
Dana Kominkova
Keyword(s):  
Czech Republic ◽  
Design Methodology ◽  
Polyaromatic Hydrocarbons ◽  
Reservoir Sediment ◽  
Terrestrial Environment ◽  
Content Type ◽  
Sediment Extraction ◽  
History Of ◽  
Us Epa ◽  
Practical Implications

Purpose The purpose of this paper is to evaluate the historical pollution of the Hostivar Reservoir (largest reservoir in Prague) sediment by metals, polyaromatic hydrocarbons (PAH) and polychlorinated biphenyls (PCB) and identify the trends in pollution of aquatic environment. Design/methodology/approach Core samples, 140 cm long, recording the 45-year history of the reservoir, were separated to 5 cm width subsamples (approximately 1.5 years of sedimentation) and analyzed for metals (Cd, Pb, Cu, Zn, Cr, Ni, Al), PAH and PCB. Following methods were used: US EPA 3051 for metals, US EPA 505 and US EPA 8082 A for PCB, and ISO 18287:2006 for PAH. Findings Most of the contaminants had the highest concentration at the beginning of the existence of the reservoir, suggesting that the contamination results from construction activities. Significant decrease of Pb occurred in the second half of the 1990s. It was caused by termination of the addition of lead as a detonation suppressant to the gasoline. Most concentrations of PAHs, PCBs and metals, except copper do not present eco-toxicological risk. Practical implications The results show the volume of priority pollutants removed from the reservoir by sediment extraction, and point risk to the terrestrial environment due to application of the sediment in the construction of a noise protecting wall. Originality/value The paper presents unique data about historical contamination of the largest reservoir in Prague, the capital of Czech Republic. It shows how the watershed and the construction phase of the dam cause a pollution of the reservoir sediment and possible environmental risk for aquatic biota.

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