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Search Results: 1 - 10 of 237712 matches for " ?u?ulovi? R. "
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Activity concentrations of 137Cs and 40K in mosses from spas in Eastern Serbia
uulovi? Ana,uuloviR.,Sabovljevi? M.,Veselinovi? D.
Archives of Biological Sciences , 2012, DOI: 10.2298/abs1203917c
Abstract: With the aim of detecting the presence of radionuclides in moss samples in eastern Serbia, 129 samples of mosses were collected from 2000 to 2010 in the region of the spas: Sokobanja, Banja Jo anica and Gamzigradska banja. The data obtained show that 137Cs was present in all of the 129 samples from 3 sampling areas and 15 sampling localities and in 20 moss taxa. This indicates that pollution with this radionuclide resulting from the Chernobyl accident still exists. Changes in the average activity concentrations of 40K are within measurement error limits, while for 137Cs changes in the average activity concentrations are more noticeable, i.e. they have decreased with time. [Acknowledgments. This work was supported by the Ministry of Education and Science of the Republic of Serbia, project code III 43009.]
Mosses as biomonitors for radioactivity following the Chernobyl accident
uulovi? Ana,uuloviR.,Cveti?-Anti? Tijana,Veselinovi? D.
Archives of Biological Sciences , 2011, DOI: 10.2298/abs1104117c
Abstract: In this work 137Cs and 40K radionuclide concentrations in moss collected at NP Djerdap in the period from 1996 to 2009 are presented. Values of the substrate-moss transfer factor for 137Cs and 40K were calculated. The effective and biological half-life of 137Cs in Homalothecium sericeum moss collected in the period from 1996 to 2008 on the archeological locality of Lepenski Vir was also calculated.
Tourist valorization of the municipality of Negotin
uulovi? Rodoljub,uulovi? Ana
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1003089c
Abstract: According to its physical-geographical and socio-economical characteristics, the municipality of Negotin belongs to the territories with favorable tourist potentials. In order to scientifically validate this fact, in this paper tourist valorization has been performed using quantitative-qualitative method, giving attractiveness ranking values, based on which conclusions have been made on the direction and forms of tourist potential. The results obtained from tourist valorization have shown that the hydrographic potential and fauna are rated as good (3), and have the highest general tourist value among natural resources. General values are graded as satisfactory (1.8) and the climate is graded as unsatisfactory (1.2). Valorization of anthropogenic characteristics gave the maximal general value (4) to cultural-historical objects including sacral objects - monasteries and churches and the Rajac pimnice. The Rajac pimnice have an especially high value, as they represent, for us, a unique value that can be considered in diverse ways and adjusted to tourist utilization. Based on the performed tourist valorization it can be noted that the general tourist value of the municipality of Negotin is of regional ranking, though anthropogenic potentials are of national ranking and part of them, as emphasized, are objects that are internationally important. The basic shortcoming is the low road quality leading to places of important tourist value, even though the road network is favorable, and there are also many weaknesses in the receptive tourist base. Improvement of these shortcomings would create a good image of the municipality of Negotin in continental tourism of the Republic of Serbia.
Indicators of sustainable development of rural and ethno tourism of the lower Danube basin
uulovi? Rodoljub,Mrk?a Milutin,uulovi? Ana
Glasnik Srpskog Geografskog Dru?tva , 2011, DOI: 10.2298/gsgd1103065c
Abstract: Indicators that should express all forms of sustainable development of rural tourism are analyzed in this paper. These are primarily indicators of economic efficiency, technological development, social success and ecological sustainability. The objective of this paper is to indicate the need and method for the creation of modern programmes for the development of rural and ethno tourism and projects of tourist activity and offer, based on the sustainable development principles. It also indicates standard procedures for integral control of ethno-tourist programmes and projects. These indicators can be used both in analytical parts of plans and development programmes, and also in control of the implementation of these plans and programmes. It is preferable that these indicators should show the real state with elements showing potentials and limitations. It is recommended that these indicators should be expressed in a quantitative form whenever possible. However, even in developed societies the methodology of quantification of sustainable development indicators has not been developed enough, leaving the possibility for imprecise evaluation of development potentials.
Natural radionuclides and 137Cs in moss and lichen in eastern Serbia
uulovi? Ana,Popovi? Dragana,uulovi? Rodoljub,Ajti? Jelena
Nuclear Technology and Radiation Protection , 2012, DOI: 10.2298/ntrp1201044c
Abstract: The paper presents the results of radionuclides determination in moss (Homolothecium sp., Hypnum Cupressiforme sp., and Brachythecium sp.) and lichen (Cladonia sp.) sampled in the region of Eastern Serbia during 1996-2010. The activities in moss are in the range of 100-500 Bq/kg d. w. for 40K, and 5-50 Bq/kg d. w. for 226Ra and 232Th, while the “soil-to-moss” transfer factors are 0.45 for 40K, 3 for 226Ra, and 0.3 for 232Th. The spatial distribution of the 137Cs activities is highly non-uniform; some values reach 500 Bq/kg d. w., with less than 10% of the samples, mainly the ones taken prior to 2000, with the activity above 1000 Bq/kg d. w. The variations in the content of natural radionuclides among the moss species are not significant. The frequency pattern of the activities of natural radionuclides in lichen is similar to the one in moss, but the activities in lichen are to some extent lower. The mean activity of 137Cs in lichen is below 400 Bq/kg d. w. The mean activities of 7Be in moss and lichen sampled in 2006 and 2008 are in the range of 41-122 Bq/kg d. w., with pronounced variations between the sampling sites.
Opportunities for development of ecotourism in central Banat
uulovi? Rodoljub,Mrk?a Milutin M.,?eki? Tatjana,uulovi? Ana
Glasnik Srpskog Geografskog Dru?tva , 2012, DOI: 10.2298/gsgd1203109c
Abstract: Increasing interest in the preserved nature caused the emergence of ecotourism as epoch-making tourism activities with minimal impact on environment of tourist destinations and locality. Natural features and protected natural resources of the Middle Banat a good basis for the development of ecotourism, but it is necessary to serious and responsible approach in the planning of tourism development potentials into new usable value.
Strategic programmes for sustainable development of local communities
Lje?evi? Milutin,Mihajlovi? Bojana,uulovi? Rodoljub
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1004159l
Abstract: The concept of sustainable development is recent one, but this problem has been dealt with by the humanity from its beginnings. Back in the ancient time, a number of thinkers already understood the truth that quality of life meant actually good health, material goods and regulated social life. Nowadays, this concept is thought about in a more specific way. A sustainable development theory has been developed and become a leading premise of human life quality at international level. The term “sustainable development” is interpreted in various ways. Among the representatives of the futuristic elite of highly developed countries, the concept of sustainable development implies maintenance of production level and consumption of resources in this present time in order to stop the excessive consumption of natural resources and maintain the environment. This would, in fact, maintain the status of economic relations in the world and would conserve the status of privileged nations acquired at the time of great colonial empires.
Influence of acid rain components on radiocesium-137 desorption from Cetraria islandica (L.) Ach. lichen
uulovi? Ana A.,Veselinovi? Dragan S.,Miljani? ??epan S.
Hemijska Industrija , 2012, DOI: 10.2298/hemind111209026c
Abstract: Desorption of 137Cs from Cetraria islandica (L.) Ach. lichen was performed by five consecutive desorptions with five identical solution volumes. Solutions of H2SO4, HNO3 and their mixtures, with pH 4.61, 5.15 and 5.75 were used for desorption. The desorbed amount of 137Cs (average value, all solutions used) from lichen, for a given pH value was 49.2% for pH 4.61; 47.0% for pH 5.15 and 47.6% for pH 5.75. The obtained values of the desorbed amount of 137Cs from lichen are in accordance with the data obtained in earlier work, when 46.2 % 137Cs was desorbed from lichen for pH 3.75, and 47.2% was desorbed for pH 2.87. A higher percentage of 59.8%, obtained for pH 2.00 indicates increased activity of H+ ions. The amount of desorbed 137Cs from lichen using solutions corresponding to acid rain cannot be lower than the stated values as they contain other substances besides the acid solutions used in this work.
Desorption of 137Cs from Cetraria islandica (L.) Ach. using solutions of acids and their salts mixtures
Journal of the Serbian Chemical Society , 2009,
Abstract: The desorption of 137Cs from Cetraria islandica (L.) Ach. lichen was investigated using the solutions: A) H2SO4–HNO3–K2SO4, B) H2SO4–HNO3–Na2SO4 and C) H2SO4–HNO3– (NH4)2SO4–(NH)4NO3 at pH 2.00, 2.58, 2.87, 3.28 and 3.75, similar to acid rain. After five consecutive desorptions using solutions A, B and C, from 44.0 % (solution B, pH 3.75) to 68.8 % (solution C, pH 3.28) of 137Cs had been desorbed from the lichen. In all cases, the most successful 137Cs desorption was the first one. In the presence of K+ (solution A) the total amount of desorbed 137Cs did not depend on the pH of the solution and this was confirmed by the analogous reactions of Cs+ and K+, due to their similar ionic radii. The dependencies of the non-desorbed content of 137Cs on the number of desorptions gave curves indicating that at least two types of sorption occur. One of them can be dominant if suitable desorbants are used. The results indicate lichens as secondary sources of environment pollution with 137Cs.
Clinico-radiological characteristics of bronchial carcinoid
Stevi? R.,Jovanovi? D.,Ma?ulovi? D.,Pe?ut D.
Acta Chirurgica Iugoslavica , 2009, DOI: 10.2298/aci0904051s
Abstract: Objectives: To review clinical and radiological characteristics of a patients with bronchial carcinoid. Methods: In this retrospective study, we reviewed the clinical, pathological and imaging findings in 42 patients diagnosed with bronchial carcinoid during the seven years period. Results: There were 23 women and 19 men, with a mean age of 47 years (range from 15 to 75). Thirty patients had typical and 12 atypical bronchial carcinoid. Dominant symtoms were cough (46,7%) and 38%. Tumor was localized in 28 patients in the left, and 14 in the right lung. On radiographs carcinoid manifested as tumor shadow in 40.5%, nodule and atelectasis in 21.4% cases each respectively, pleural effusion and pneumonia in 7.1% each respectively and hyperinflation in 2.4% of the cases. Computerized tomography revealed endoluminal tumor in 30.9% patients. Conclusion: Major imaging findings are central, tumor mass or nodule and obstruction signs like atelectasis. Diagnosis is confirmed by pathological examination of samples taken by bronchoscopy or surgery.
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