The polycyclic quinones occur in some bacteria, fungi, and parts of higher plants.
Some of the most-potent carcinogens for humans are the polycyclic aromatic hydrocarbons, which require metabolic activation for becoming reactive.
Instead, the polycyclic structure adopts a C s symmetry.
A higher number of enzymes involved in the polycyclic aromatic degradation were found in the BA sample.
This result indicated that a ring fusion manner of the polycyclic structure is important to recognize membrane proteins.
Interestingly, only the polycyclic ether having a 6/7/6/7/7 ring stabilized the α-helical structure of melittin.
The polycyclic aromatic hydrocarbon (PAH) contamination of urban, agricultural and forest soil samples was investigated from samples obtained in the surroundings of Valasske Mezirici.
The polycyclic aromatic compounds have several possible mechanisms for environmental release, including volatilization, photo-oxidation, chemical oxidation, bioaccumulation, adsorption on soil particles, leaching, and microbial degradation.
Among many aromatic surfactants, the polycyclic aromatic hydrocarbons such as pyrene, perylene, anthracene etc. deserve special mention, as they can be considered as "nanographenes".
The strategy to regularly arrange and join the polycyclic aromatic hydrocarbons of asphalt into graphene was explored.
Their thermal decomposition produced respectively, perfluoroalkyl and perfluoropolyether radicals that directly bonded the polycyclic aromatic structure of carbon black surface.
