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Search Results: 1 - 10 of 131055 matches for " Babovi? Nada V. "
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Obtaining of the antioxidants by supercritical fluid extraction
BaboviNada V.,Petrovi? Slobodan D.
Hemijska Industrija , 2011, DOI: 10.2298/hemind100713064b
Abstract: One of the important trends in the food industry today is demand for natural antioxidants from plant material. Synthetic antioxidants such as butylated hydroxytoluene (BHT), and butylated hydroxyanisole (BHA) are now being replaced by the natural antioxidants because of theirs possible toxicity and as they may act as promoters of carcinogens. The natural antioxidants may show equivalent or higher antioxidant activity than the endogenous or the synthetic antioxidants. Thus, great effort is being devoted to the search for alternative and cheap sources of natural antioxidants, as well as to the development of efficient and selective extraction techniques. The supercritical fluid extraction (SFE) with carbon dioxide is considered to be the most suitable method for producing natural antioxidants for the use in food industry. The supercritical extract does not contain residual organic solvents as in conventional extraction processes, which makes these products suitable for use in food, cosmetic and pharmaceutical industry. The recovery of antioxidants from plant sources involves many problematic aspects: choice of an adequate source (in terms of availability, cost, difference in phenolic content with variety and season); selection of the optimal recovery procedure (in terms of yield, simplicity, industrial application, cost); chemical analysis of extracts (for optimization purposes a fast colorimetric method is more preferable than a chromatographic one); evaluation of the antioxidant power (preferably by the different assay methods). The paper presents information about different operational methods for SFE of bioactive compounds from natural sources. It also includes the various reports on the antioxidant activity of the supercritical extracts from Lamiaceae herbs, in comparison with the activity of the synthetic antioxidants and the extracts from Lamiaceae herbs obtained by the conventional methods.
Potential uses of biomass from fast-growing crop miscanthus×giganteus
BaboviNada V.,Dra?i? Gordana D.,?or?evi? Ana M.
Hemijska Industrija , 2012, DOI: 10.2298/hemind110711082b
Abstract: There is an increasing interest in perennial grasses as a renewable source of bioenergy and feedstock for second-generation cellulosic biofuels. Switchgrass (Panicum virgatum) and miscanthus (Miscanthus×giganteus), belonging to the parennial grasses group, are the major lignocellulosic materials being studied today as sources for direct energy production, biofuels, bioremediation and other. They have the ability to grow at low cost on marginal land where they will not compete with the traditional food crops. Miscanthus×giganteus possesses a number of advantages in comparison with the other potential energy crops such as are: high yields, low moisture content at harvest, high water and nitrogen use efficiencies, low need for annual agronomic inputs such as fertilizers and pesticides, high cellulose content, non-invasive character, low susceptibility to pests and diseases and broad adaptation to temperate growing environments. The main problems are low rate of survival during the first winter after the creation of plantation and the relatively high establishment costs. Miscanthus×giganteus is grown primarily for heat and electricity generation but can also be used to produce transport fuels. Miscanthus biomass has a very good combustion quality due to its low water concentration as well as its low Cl, K, N, S and ash concentrations compared to other lignocellulose plants. It is expected that miscanthus will provide cheaper and more sustainable source of cellulose for production of bioethanol than annual crops such as corn. Miscanthus has great promise as a renewable energy source, but it can only be realised when the grass production has been optimised for large-scale commercial cultivation. However, further research is still needed to optimise agronomy of miscanthus, to develop the production chain and pre-treatment as well as to optimise energy conversation route to produce heat, electricity, and/or fuels from biomass, if miscanthus is to compete with fossil fuel use and be widely produced.
Cancer in the elderly: A challenge for 21st century
Krea?i? Miroslav,BaboviNada,Ursulovi? Tamara,Jeli? Svetislav B.
Archive of Oncology , 2002, DOI: 10.2298/aoo0203132k
Chemical Industry and Chemical Engineering Quarterly , 2011,
Abstract: This paper shows the results obtained in field analysis performed at the Tami River, starting from the settlement Ja a Tomi (the border between Serbia and Romania) to Pan evo (the confluence of Tami into the Danube). The Tami is a 359 km long river rising in the southern Carpathian Mountains. It flows through the Banat region and flows into the Danube near Pan evo. Over the years, the water quality of the river has severely deteriorated and badly affected the environment and the river ecosystem. In situ measurements enabled determination of physico-chemical parameters of water quality of the Tami River at every 400 m of the watercourse, such as: water temperature, pH value, electrical conductivity, contents of dissolved oxygen and oxygen saturation. The main reason of higher pollution of Tami is seen in connection to DTD hydro system. Sampling was performed at 7 points with regard to color, turbidity, total hardness, alkalinity, concentration of ammonium nitrogen, nitrite nitrogen, nitrate nitrogen, iron, chlorides and sulphates in samples. The aim of the present work was to evaluate water quality in the Tami River taking into account significant pollution, which originates from settlements, industry and agriculture, and to suggest appropriate preventive measures to further decrease the pollution of the river's water.
Chemical Industry and Chemical Engineering Quarterly , 2010,
Abstract: This study reports the effect of antioxidant fractions from rosemary (Rosma-rinus officinalis), sage (Salvia officinalis), thyme (Thymus vulgaris) and hyssop (Hyssop officinalis) on the oxidative stability of sunflower oil at elevated tempe rature. In order to isolate antioxidant fractions, the method of fractional super critical extraction with carbon dioxide at 35 MPa and 100 C was applied. Anti oxidant fractions were added to sunflower oil at concentrations of 200 mg/kg oil and the samples were stored in an oven maintained at 98 C. The antioxidant activity of the extracts was determined by measuring peroxide values (PV). Among investigated extracts, the rosemary extract was most effective on retarding lipid oxidation of sunflower oil. The antioxidant activity of the extracts was com pared to the activity of butylated hydroxyanisole (BHA) and a commercial rose mary extract Flavor’ Plus. On the basis of PV assay, the antioxidant activity of the investigated plant extracts after 12 h of storage at 98 C followed the order: rosemary extract > BHA > sage extract > Flavor’ Plus > thyme extract > hyssop extract.
Types of rivers and their dependence of the cartographic projections, example of river Lepenica
Babovi? Stefana
Glasnik Srpskog Geografskog Dru?tva , 2012, DOI: 10.2298/gsgd1204113b
Abstract: The river system of Lepenica was drawn by using the GeoMedia programme in projections of 1:25 000, 1:50 000 and 1:300 000. Different type of information was shown using each of these projections, because smaller projections show more general information, and vice versa. Using the Horton, Strahler and Schrewe Methods we were able to divide rivers into types according to their sizes. We are also able to show the density of river network as well as their physio-geographical characteristics due to their dependence on each other. Big influence on the current appearance of the river network is due to one of the physio-geographic factors called geology. Geological composition of the Lepenica flow is very convoluted. This convolution is mainly based on their origin but it’s also stratigraphical. Based on the division of rivers into their types we are able to calculate the number of watercourses, based on the Schrewe Method. Using this method we can also make conclusions with regards to density of river network. Placing the rivers into different classes is mainly used as the basis of watercourse comparisons. These methods are not only used in hydrology, but also in many other scientific areas. [Projekat Ministarstva nauke Republike Srbije, br. 43007: Istra ivanje klimatskih promena na ivotnu sredinu - pra enje uticaja, adaptacija i ubla avanje]
Social networks: Networking of social actors in the sphere of economic activities
Babovi? Marija
Sociologija , 2005, DOI: 10.2298/soc0504351b
Abstract: The article reviews one of the important fields of study in contemporary economic sociology - social networks in the sphere of economic activities. Besides basic theoretical and methodological conceptions in studying social networks that originate from general sociology and special sociological disciplines most important fields of study of social networks in economic sociology are presented. Some influential studies of social networks are analyzed; some key weaknesses of social network approach are pointed out, as well as possibility of their future development.
Petar Babovi
Acta Medica Medianae , 2009,
Abstract: Occupational accidents due to inadequate working conditions and work environment present a major problem in highly industrialised countries, as well as in developing ones. Occupational accidents are a regular and accompanying phenomenon in all human activities and one of the main health related and economic problems in modern societies.The aim of this study is the analysis of the connections of unfavourable working conditions and working environment on occupational accidents. Occurrence of occupational accidents was monitored in two groups of workers in the period of ten years. The exposed group comprised 1854 male workers occupationally exposed to harmul effects (noise, chemical noxae, unfavourable microclimate factors, poor lighting) and special work demands (work in shifts, production quota work, night work). The control group comprised 1380 male workers who had not been exposed to the same working demands and professional noxae in the given period of time.In the period of ten years the number of workers having occupational accidents was statistically significantly higher in the exposed group than in the control one. The total number of accidents in the exposed group was 382/1850 (20.6%), while in the control group it was 124/1380 (8.98%); p<0.01. Accidents while commuting to and from work were similar in both groups, but the difference in accidents at work place is significant (13.9% in the exposed) and (1.95% in unexposed) group; p<0.01.Unfavourable working conditions and working environment present significant factors that have impact on occupational accidents, thus occupational accidents can be considered as indicators of inadequate working conditions and working environment.
Pathogenicity of some bacterial species isolated from the bee digestive tract
Dugali?-Vrndi? Nada,Vukovi? V.,Nedi? N.
Acta Veterinaria , 2010, DOI: 10.2298/avb1001049d
Abstract: The aim of this paper was to examine the pathogenicity of most commonly isolated bacteria from the digestive tract of bees. Bees from 150 colonies (n=3000) were examined and 19 bacterial species were isolated, which are either permanent or temporary inhabitants of the digestive tract. Pathogenic activity of the most commonly isolated species (Enterobacter aerogenes, Klebsiella ozaenae, Klebsiella pneumonie, Citrobacter freundii, Enterobacter cloacae and Enterobacter agglomerans) was examined on seven-day-old chicken embryos and tissue of MDBK cells. Bacterial inoculation of the examined bacteria was conducted in the alantoic cavity of chicken embryos in the quantity of 0.5 mL. Control noninoculated and inoculated embryos were incubated at 38oC with about 60% relative humidity. All six bacterial species manifested pathogenic activity on chicken embryos and caused their death within 2-4 days and changes such as lagging in embryo development, bleeding and unpleasant smell. The bacteria examined in MDBK cell lines of bovine kidney tissue did not manifest cytopathogenic effect and the structure of control tissue was normal.
Ranking of Vojvodina municipalities according to multidimensional denominator of livestock production commodities
Laki? Nada S.,Stevanovi? Simo V.
Journal of Agricultural Sciences , 2003, DOI: 10.2298/jas0302217l
Abstract: Marketability of livestock production was analyzed based on the marketability of both pork, beef, sheep and poultry and eggs and cow's milk. The sequential order of the Vojvodina municipalities according to the observed denominators is not identical. But, Spearman's coefficient of correlation points to a statistically very high degree of accordance between the rank-list of marketability of pork and the rank-lists of marketability of beef, poultry and milk as well as the rank-list of poultry and sequential classification of sheep meat and eggs, beef and milk. There was a statistically high correlation between the rank list of marketability of sheep meat and pork, beef and milk as well as poultry and milk. Based on the value of Kendal coefficient of ranking, it can be concluded that there exists very high degree of accordance of all the rank lists being observed simultaneously. For determination of sequential classification according to the achieved marketability of all the analyzed livestock production commodities in the sense of synthetic denominator, Ivanovic distance was used in the present work.
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