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Belgrade, Serbia

Stijepic M.,Higher Medical School | Glusac J.,Higher Medical School | Durdevic-milosevic D.,Anahem Laboratory | Pesic-Mikulec D.,Scientific Veterinary Institute of Serbia
Romanian Biotechnological Letters

The main objectives of this study were (1) to produce control cow's yoghurt that will serve as basis of comparison for produced cow's and soy yoghurts with added probiotic cultures and inulin as prebiotic, (2) to determine trend of change of pH values in yoghurt during the fermentation, (3) to investigate the changes of some physicochemical properties of experimental designed yoghurts during the refrigerated storage. The drop in pH during fermentation was faster in the cow's milk than in soymilk. During the storage at 4 °C the pH value of the fermented products remained mostly unchanged compared to control sample under same condition of storage. No great differences are noticed among the viscosities and water holding capacity (WHC) after 1st and 20th day of storage. Only after 10th day of storage were noted increasing in WHC in all of produced yoghurt sample, except fermented cow's milk with 3% inulin addition. Statistical analysis of experimental results showed no difference in syneresis among observed samples and control sample. This research proves that there are serious confirmations those supporting develop of new soy yoghurt formulation. Stability during storage is important characteristic what is proved observing physicochemical characteristics of produced samples of soy yoghurt. © 2013 University of Bucharest. Source

Dragovic S.,University of Belgrade | Gajic B.,University of Belgrade | Dragovic R.,University of Nis | Jankovic-Mandic L.,Vinca Institute of Nuclear Sciences | And 5 more authors.
Journal of Environmental Monitoring

The specific activities of natural radionuclides ( 40K, 226Ra and 232Th) and Chernobyl-derived 137Cs were measured in soil profiles representing typical soil types of Belgrade (Serbia): chernozems, fluvisols, humic gleysols, eutric cambisols, vertisols and gleyic fluvisols. The influence of soil properties and content of stable elements on radionuclide distribution down the soil profiles (at 5 cm intervals up to 50 cm depth) was analysed. Correlation analysis identified associations of 40K, 226Ra and 137Cs with fine-grained soil fractions. Significant positive correlations were found between 137Cs specific activity and both organic matter content and cation exchange capacity. Saturated hydraulic conductivity and specific electrical conductivity were also positively correlated with the specific activity of 137Cs. The strong positive correlations between 226Ra and 232Th specific activities and Fe and Mn indicate an association with oxides of these elements in soil. The correlations observed between 40K and Cr, Ni, Pb and Zn and also between 137Cs and Cd, Cr, Pb and Zn could be attributed to their common affinity for clay minerals. These results provide insight into the main factors that affect radionuclide migration in the soil, which contributes to knowledge about radionuclide behaviour in the environment and factors governing their mobility within terrestrial ecosystems. © 2012 The Royal Society of Chemistry. Source

Sredovic Ignjatovic I.D.,University of Belgrade | Onjia A.E.,Vinca Institute of Nuclear Sciences | Onjia A.E.,Anahem Laboratory | Ignjatovic L.M.,University of Belgrade | And 3 more authors.
Analytical Letters

Determination of total halogens in coal was investigated with oxygen bomb combustion followed by ion chromatography. Experimental parameters were optimized by fractional factorial design and response surface methodology. Fractional factorial design was employed in screening experiments to evaluate the influence of the oxygen pressure, catalyst, absorption solution, reduction reagent, bomb cooling time, and a combustion aid on the combustion of coal in an oxygen bomb. Response surface methodology was conducted to further refine the results obtained by fractional factorial design and to define parameters for the procedure. The accuracy and precision of combustion with ion chromatography were evaluated by the use of two certified reference materials and by fortified in-house coal standards. The limits of detection and quantification for total halogens were 0.84 and 2.80 milligrams per kilogram, respectively, for 500 milligram samples. Ion chromatography provided relative standard deviations less than 4 percent, recoveries exceeding 95 percent, and was convenient. This method is recommended for routine determination of total halogens in coal because of its reliability. © 2015, Copyright © Taylor & Francis Group, LLC. Source

Dragovic S.,University of Belgrade | Cujic M.,University of Belgrade | Slavkovic-Beskoski L.,Vinca Institute of Nuclear Sciences | Slavkovic-Beskoski L.,Anahem Laboratory | And 5 more authors.

The content of trace elements (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb and Zn) in surface soils in the area surrounding the largest coal-fired power plant in Serbia was determined to assess the contribution of emissions to pollution. Analysis of mutual associations between the trace elements and their correlation with soil particle size fractions indicated anthropogenic origin at most sampling sites. Enrichment factor analysis confirmed these findings. Common patterns in trace element concentrations of the analysed soils were identified by hierarchical cluster analysis. Explanatory spatial analysis, used for characterization and mapping of spatial variability patterns, revealed the highest concentrations of trace elements in areas in predominant wind directions. © 2012 Elsevier B.V. Source

Cujic M.,University of Belgrade | Dragovic S.,University of Belgrade | Sabovljevic M.,University of Belgrade | Slavkovic-Beskoski L.,Vinca Institute of Nuclear Sciences | And 5 more authors.
Clean - Soil, Air, Water

The survey results of an atmospheric deposition of major, minor and trace elements using the moss biomonitoring technique are given for the vicinity of the largest thermal power plant in Serbia. The mosses of genus Brachythecium sp. and species Kindbergia praelonga (Hedw) Ochyra, both pleurocarpous, were favoured. The concentrations of 22 elements were determined in moss samples using different spectrometric techniques depending on the sensitivity needed. Elevated concentrations of As, Cd, Co, Hg, Ni and V were found in the vicinity of the thermal power plant. The results obtained were chemometrically treated by cluster analysis, which grouped the elements into three clusters based on common patterns in their concentrations. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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