Computed electronic structure of polynuclear aromatic hydrocarbon agglomerates

On the problem of the connection between the electronic structure of polynuclear aromatic hydrocarbons and their carcinogenic effect.

On the basis of exact values of atomic localization energies and ortho-localization energies, the validity of the theory of A. Pullman and B. Pullman was investigated concerning the relation between the electronic structure and carcinogenic effect of aromatic hydrocarbons. The application of exact values of localization energies has led to almost the same results as obtained by the Pullmans. By...

Biochemical Activation of Aryl Hydrocarbon Hydroxylase Activity, Cellular Distribution of Polynuclear Hydrocarbon Metabolites, and DMA Damage by Polynuclear Hydrocarbon Products in Human Cells in V/fro1

Carcinogenic polynuclear hydrocarbons [7,12-dimethylbenzanthracene, 3-methylcholanthrene, and benzo(a)pyrene] were added to human skin fibroblast cell cultures. Only benzo(a)pyrene at 10 ¿ig/mlor above induced mixed-function hydroxylase activity, altered cell prolifer ation kinetics, and caused DNA damage as measured by altered grain count and bromodeoxyuridine incorporation. 3-Methylcholanthr...

Polycyclic aromatic hydrocarbon biodegradation rates: a structure-based study.

This study was designed to examine the role of molecular structure in determining the biodegradation rates of polycyclic aromatic hydrocarbons (PAHs). Laboratory experiments were performed in aqueous systems, and data were analyzed in a manner that allowed determination of first-order biodegradation rates independent of bioavailability limitations from physical-chemical processes. An aerobic mi...

Effect of simulated rhizodeposition on the relative abundance of polynuclear aromatic hydrocarbon catabolic genes in a contaminated soil.

Microcosms were used to investigate whether soil exposure to mulberry root extracts (rich in phenolic compounds) select for bacteria that degrade polynuclear aromatic hydrocarbons (PAHs). Unlike previous studies with freshly spiked soil, the present experiments were conducted with soils aged for 518 d with [14C]phenanthrene to decrease bioavailability and avoid exaggerating the selective pressu...

Comparison of aromatic hydrocarbon measurements