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Popovic A.,University of Belgrade | Djordjevic D.,Chemistry Center
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2015

In order to establish associations of trace and major elements in dump coal ash taken from active, currently filled cassette of "Nikola Tesla A" power plant dump (Obrenovac near Belgrade, Serbia), eight samples of dump ash were subjected to a five-step sequential extraction, comprising of the following phases: distilled water, 1 M ammonium acetate, 0.2 M ammonium oxalate/0.2 M oxalic acid, acidic solution of H2O2, and 6 M solution of HCl. The obtained concentrations were subjected to correlation analysis, and results compared to those obtained by analysis of leached concentrations from fresh, lignite filter coal ash. © Taylor and Francis Group, LLC. Source


Popovic A.,University of Belgrade | Djordjevic D.,Chemistry Center
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2015

Eight samples each of coal ash taken from active, currently filled, and passive, previously filled cassettes of "Nikola Tesla A" power plant dump (Obrenovac near Belgrade, Serbia) were subjected to a sequential extraction, comprising of the following five phases: distilled water, 1 M ammonium acetate, 0.2 M ammonium oxalate/0.2 M oxalic acid, acidic solution of H2O2, and 6 M solution of HCl. Leached concentrations were discussed from the standpoint of their environmental significance, keeping in mind the processes occurring during and after coal ash transport to the dump, as well as the concentrations washed from the original filter lignite ash. © Taylor and Francis Group, LLC. Source


Yang X.,University of Western Australia | Yang X.,Shaanxi Normal University | Croft K.D.,University of Western Australia | Lee Y.P.,Curtin University Australia | And 5 more authors.
Antioxidants and Redox Signaling | Year: 2010

A diet enriched in lupin kernel flour can lower blood pressure, but mechanisms responsible are unclear. Lupin is a source of polyphenols, protein, and L-arginine, factors that may influence blood pressure via effects on oxidative stress and vascular function. Therefore, we aimed to determine the effects of a lupin-enriched diet on oxidative stress and factors influencing vascular function as potential mechanisms for demonstrated benefits on blood pressure. Overweight men and women (n = 88) were recruited to a 16-week parallel-design study. Participants were randomly assigned to replace 15%-20% of their usual daily energy intake with white bread (control) or lupin kernel flour-enriched bread (lupin). All measurements were taken at baseline and 16 weeks. At baseline, plasma F2-isoprostanes and 20- hydroxyeicosatetraenoic acid (20-HETE) were positively associated with blood pressure, and plasma nitrite was negatively associated with blood pressure (p < 0.05). For lupin relative to control, the estimated differences in plasma F2-isoprostanes (45 pmol/L; 95%CI: - 68, 158), urinary F 2-isoprostanes (17 pmol/mmol creatinine; 95%CI: - 43, 76), plasma 20-HETE (75 pmol/L; 95%CI: - 91, 241), and plasma nitrite (-0.3 μmol/L; 95%CI: - 1.1, 0.4) were not significant. Although regular consumption of lupin-enriched bread can lower blood pressure, these results do not support for the hypothesis that this is via effects on oxidative stress or vascular function. © Mary Ann Liebert, Inc. Source


Bondonno C.P.,University of Western Australia | Yang X.,Shaanxi Normal University | Croft K.D.,University of Western Australia | Considine M.J.,University of Western Australia | And 6 more authors.
Free Radical Biology and Medicine | Year: 2012

Flavonoids and nitrates in fruits and vegetables may protect against cardiovascular disease. Dietary flavonoids and nitrates can augment nitric oxide status via distinct pathways, which may improve endothelial function and lower blood pressure. Recent studies suggest that the combination of flavonoids and nitrates can enhance nitric oxide production in the stomach. Their combined effect in the circulation is unclear. Here, our objective was to investigate the independent and additive effects of flavonoid-rich apples and nitrate-rich spinach on nitric oxide status, endothelial function, and blood pressure. A randomized, controlled, crossover trial with healthy men and women (n = 30) was conducted. The acute effects of four energy-matched treatments (control, apple, spinach, and apple + spinach), administered in random order, were compared. Measurements included plasma nitric oxide status, assessed by measuring S-nitrosothiols + other nitrosylated species (RXNO) and nitrite, blood pressure, and endothelial function, measured as flow-mediated dilatation of the brachial artery. Results are means and 95% CI. Relative to control, all treatments resulted in higher RXNO (control, 33 nmol/L, 26, 42; apple, 51 nmol/L, 40, 65; spinach, 86 nmol/L, 68, 110; apple + spinach, 69 nmol/L, 54, 88; P < 0.01) and higher nitrite (control, 35 nmol/L, 27, 46; apple, 69 nmol/L, 53, 90; spinach, 99 nmol/L, 76, 129; apple + spinach, 80 nmol/L, 61, 104; P < 0.01). Compared to control, all treatments resulted in higher flow-mediated dilatation (P < 0.05) and lower pulse pressure (P < 0.05), and apple and spinach resulted in lower systolic blood pressure (P < 0.05). No significant effect was observed on diastolic blood pressure. The combination of apple and spinach did not result in additive effects on nitric oxide status, endothelial function, or blood pressure. In conclusion, flavonoid-rich apples and nitrate-rich spinach can independently augment nitric oxide status, enhance endothelial function, and lower blood pressure acutely, outcomes that may benefit cardiovascular health. © 2011 Elsevier Inc. Source


Popovic A.,University of Belgrade | Djordjevic D.,Chemistry Center | Relic D.,University of Belgrade | Mihajlidi-Zelic A.,University of Belgrade
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2011

Six composite filter fly, bottom, and dump ash samples, each taken from Obilic power plant, were subjected to the sequential extraction procedure comprised of five phases. Iron silicates, alumosilicates not containing iron and silicates not containing iron nor aluminum, as well as a form of aluminum not containing silicon, are established as substrates dissolved in the fifth phase of extraction. Alumosilicates and mixed oxides of iron and manganese are dissolved in the third phase of extraction. Association patterns and distribution of trace and major elements with substrates as well as environmental consequences of such distribution were established and discussed. © 2011 Copyright Taylor and Francis Group, LLC. Source

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