National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
An acellular genotoxicity assay of complex mixtures of organic compounds bound on size segregated aerosols.
Fikejzlová, Monika ; Rössner, Pavel (advisor) ; Machala, Miroslav (referee)
The main aim of this work was to compare the genotoxicity of organic extracts from different size fractions of aerosol particles (1-10 µm, 0,5-1 µm, 0,17-0,5 µm) collected by high volume cascade impactors in various localities of the Czech Republic differing in the extent of the environmental pollution (Březno - strip mine, Dobré Štěstí - highway, Praha - city center, Láz - background station). Genotoxicity was determined in acellular assay of calf thymus DNA (CT-DNA) with and without S9 metabolic activation by analysis of DNA adducts induced by extractable organic matter (EOM) from the particulate matter (PM) by 32 P-postlabeling and the ability of extracts to induce oxidative DNA damage was evaluated using the competitive ELISA test. The main finding of this work is that most of the observed genotoxicity is connected with fine particles (<1 µm). The concentration of carcinogenic polycyclic aromatic hydrocarbons (c-PAHs) in EOMs indicate that fine fractions bound the highest amount of c-PAHs in all sampling sites. This fact might be related to a higher specific surface of this fraction as compared with a course fraction and a higher mass as compared with a condensational fraction. As for aerosol mass, both fine and condensational fractions are effective carriers of c-PAHs. Similarly, the DNA...

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