ABSTRACT
The concentrations of radionuclides, polycyclic aromatic hydrocarbons (PAHs) and heavy metals were measured in soil samples collected from school backyards and playgrounds in Kragujevac, one of the largest cities of Central Serbia. The activity concentrations of (226)Ra, (232)Th, (40)K and (137)Cs were determined using the HPGe semiconductor detector. The average values were 34.6, 44.7, 428.9 and 45.1 Bq kg(-1), respectively. The correlation between the activity concentrations of (226)Ra in the soil samples and the results of the previous measurement of (222)Rn concentrations in the indoor air was examined. The absorbed dose rates, the annual effective doses and excess lifetime cancer risk were also estimated. The activity concentrations of (226)Ra and (232)Th have shown normal distribution. The collected soil samples were analysed for PAHs by HPLC. All analysed soil samples contained PAHs, and their total amounts (for 15 measured compounds) were found to be between 0.038 and 3.136 mg kg(-1) of absolutely dry soil (a.d.s). In addition the concentrations of As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were measured in the fourteen soil samples collected from the playgrounds of kindergartens.
Subject(s)
Environmental Exposure , Metals, Heavy/analysis , Polycyclic Aromatic Hydrocarbons/analysis , Radioisotopes/analysis , Soil Pollutants/analysis , Adolescent , Child , Environmental Monitoring , Humans , Radiation Exposure , Schools , Serbia , Soil Pollutants, Radioactive/analysis , StudentsABSTRACT
An increase in Brestan concentration in nutrient media decreased the content of protein, phosphorus, total ribonucleic acid, activity of pyruvate carboxylase and isocitrate lyase in cells of Saccharomyces cerevisiae parent strain and respiratory deficient (RD) mutant while the trehalose content increased. The respiration quotient value for the RD mutant was higher than for the parent strain. The RD mutant lacked cytochrome aa3; cytochrome c and b contents were lower than those of the parent strain.
