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Search Results: 1 - 10 of 1601 matches for " ?uki? Aleksandra "
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Patchwork or matrix: Testing the capacity of the contemporary city
Stupar Aleksandra,ukiAleksandra
Spatium , 2007, DOI: 10.2298/spat0716001s
Abstract: Being exposed to the multiple needs of their contemporary users, the cities from all over the world have been forced to activate all capacities in order to intensify their land use, adjust their urban structure and reinvent some forgotten segments (ex-industrial areas, traffic nodes, docks, waterfronts) as generators of multilayered transformations and mutations. Therefore, the purpose of this paper is to analyze and compare different approaches of this practice, as well as to emphasize the relation between the applied global imperatives/trends/myths, local conditions and limitations, and the outcomes. Consequently, the first part will be structured around four key-words which often "justify" and activate multifunctional and intensive land use - connectivity, profit, identity and sustainability. The second part will be focused on the case of Serbia, describing a unique postmodern example of the fusion of local and global influences. The multifunctional land use in this case is a result of numerous political and economic problems, the plurality of values and (il)legal transformations of urban structure. This condition has finally affected the rising need for urban redesign, the re-organization and revitalization of city centers, fringe areas, devastated and degraded urban zones, as well as the development of existing transport and communication networks i.e. improvement of urban and regional connectivity. Additionally, the "model of territorial values" will be explained as a planning tool which could be used in order to increase the level of urban attractiveness, define urban parameters and estimate land values. .
Redesigning the network of pedestrian spaces in the function of reduction of CO2 emission. Case study: Pan evo and Vr ac
ukiAleksandra,Vukmirovi? Milena
Spatium , 2012, DOI: 10.2298/spat1227031d
Abstract: Research problem. The research problem is the increase of GHG and CO2 emissions in the transport sector, i.e. the intensification of urban transport activity in Serbia during the last 15 years. Focusing on redesigning of pedestrian networks as well as understanding the connections between urban design and pedestrian movement, the walkable environment could be achieved. In addition, as a direct result, a contribution would be made to a decrease of GHG and CO2 emission. Methodology. The following methods were used: analysis of the readability of open spaces, analysis of contents, rhythm and transparency on the ground floor of buildings and analysis of the intensity of use of open spaces using the Space Syntax method. Results. The results show a proportional relation between characteristics on ground floors of buildings and the intensity of pedestrian movement. Also, they enable the establishing of general recommendations for designing the immediate pedestrian environment and upgrading the quality of open public spaces. Conclusion. The improvement of the quality of pedestrian environment would have as its direct consequence greater use of open public spaces, and thus also increased intensity of pedestrian movement. In this manner, people would face a better quality and broader selection of contents and spaces.
Walking as a Climate Friendly Transportation Mode in Urban Environment Case Study: Belgrade
Aleksandrauki,Milena Vukmirovi?
International Journal for Traffic and Transport Engineering , 2011,
Abstract: A large percent of CO2 (carbon dioxide) emissions in Serbia originate from transport. In the last two decades, the number of private car users in Belgrade evidently increased compared to the number of users of environmentally friendly modes of transport. The purpose of this paper is to present an overview of approaches to the improvement of the physical aspect of the open public spaces, which aim to increase the number of users of climate friendly modes of transport, particularly walking. Research was done using three methods: observation of the intensity of pedestrian movement in relation to different periods during the day, direct surveys of citizens and the evaluation of immediate pedestrian surroundings. Three kinds of results were obtained: the trends and concentration of pedestrian movement along the main street lines; the attitude of citizens pertaining to reliable pedestrian movement and elements which contribute to their commitment to walking; and the rhythm of activity units, transparency, and variety of activities on the ground floor of buildings. The contribution of the study is in combining different research methods. The interpretation of the results forms the basis for directing future research and campaigns on topics of climate friendly modes of transport in urban areas.
Investigations of effects of magnesium, zinc and copper on cadmium excretion in rabbits
Bulat Zorica,uki?-?osi? Danijela,Buha Aleksandra,?upi? Vitomir
Veterinarski Glasnik , 2012, DOI: 10.2298/vetgl1206395b
Abstract: Cadmium (Cd) is today one of the most significant metal poisons, both in the area of professional as well as of eco toxicology. In the organism, cadmium has a harmful effect on the kidneys, liver, bones, testicles, etc., and, based on evidence in humans that it causes lung carcinoma, it has been placed in the first group of carcinogens. In spite of numerous data in literature on the harmful effects of cadmium, the interactions between cadmium and bioelements as a significant mechanism for cadmium toxicity have still not been sufficiently explained. Since the data so far point to a positive effect of supplementation with certain bioelements regarding toxicity and cadmium content in the organism, the objective of this work was to investigate the effect of increased simultaneous intake of magnesium, zinc and copper on urinary elimination of cadmium in rabbits exposed to cadmium. Rabbits were divided into two groups: Cd group - for a period of 28 days the animals received per os 10 mg Cd/kg b.m/day and Cd+(Mg+Zn+Cu) group - 10 mg Cd/kg b.m. + 40 mg Mg/kg b.m, 20 mg Zn/kg b.m. and 10 mg Cu/kg b.m/day. Daily urine was collected on days 0, 10, 15, 17, 19, 21, 23, 25, and 28 of the experiment. Following decomposition of urine samples with the help of concentrated HNO3 and HClO4 (4:1), the metal concentration was determined using the method of atomic absorption spectrophotometry. Supplementation with magnesium, zinc and copper did not result in significant changes in the elimination of cadmium through urine in animals poisoned with cadmium, in comparison with the animals that were administered only cadmium, while the concentration of all three applied bioelements in urine was significantly increased. It can be concluded that the simultaneous administration of increased doses of zinc, copper and magnesium does not have a positive effect on the elimination of cadmium in conditions when rabbits are poisoned with cadmium.
New trends and challenges in lactic acid production on renewable biomass
uki?-Vukovi? Aleksandra J.,Mojovi? Ljiljana V.,Pejin Du?anka,Vuka?inovi?-Sekuli? Maja
Hemijska Industrija , 2011, DOI: 10.2298/hemind110114022d
Abstract: Lactic acid is a relatively cheap chemical with a wide range of applications: as a preservative and acidifying agent in food and dairy industry, a monomer for biodegradable poly-lactide polymers (PLA) in pharmaceutical industry, precursor and chemical feedstock for chemical, textile and leather industries. Traditional raw materials for fermentative production of lactic acid, refined sugars, are now being replaced with starch from corn, rice and other crops for industrial production, with a tendency for utilization of agro industrial wastes. Processes based on renewable waste sources have ecological (zero CO2 emission, eco-friendly by-products) and economical (cheap raw materials, reduction of storage costs) advantages. An intensive research interest has been recently devoted to develop and improve the lactic acid production on more complex industrial by-products, like thin stillage from bioethanol production, corncobs, paper waste, straw etc. Complex and variable chemical composition and purity of these raw materials and high nutritional requirements of Lare the main obstacles in these production processes. Media supplementation to improve the fermentation is an important factor, especially from an economic point of view. Today, a particular challenge is to increase the productivity of lactic acid production on complex renewable biomass. Several strategies are currently being explored for this purpose such as process integration, use of Lwith amylolytic activity, employment of mixed cultures of Land/or utilization of genetically engineered microorganisms. Modern techniques of genetic engineering enable construction of microorganisms with desired characteristics and implementation of single step processes without or with minimal pre-treatment. In addition, new bioreactor constructions (such as membrane bioreactors), utilization of immobilized systems are also being explored. Electrodialysis, bipolar membrane separation process, enhanced filtration techniques etc. can provide some progress in purification technologies, although it is still remaining the most expensive phase in the lactic acid production. A new approach of parallel production of lactic bacteria biomass with probiotic activity and lactic acid could provide additional benefit and profit rise in the production process.
Cadmium content in Hypericum perforatum L. and Thymus serpyllum L. from localities of the mountains Rtanj and Ozren
uki?-?osi? Danijela,Stanojevi? Aleksandra,?eki?-Ivankovi? Marija,?ur?i? Marijana
Vojnosanitetski Pregled , 2011, DOI: 10.2298/vsp1111930d
Abstract: Background/Aim. The beneficial effects of medicinal plants are well-known from the ancient times. However, expansion of phytopharmacy and phytotherapy occured during the last decades. Medicinal plants can absorb environmental contaminants from the ground and consequently may cause harmful effects on human health. Quality control usually comprises standard methodology which includes macroscopic identification and examination of active ingredients. Additionaly, there is a permanent need to control the level of pollutants in herbs, with a particular attention to the level of toxic metals. In this study we estimated the level of contamination by determining the content of cadmium (Cd) in the herbs of Hypericum perforatum and Thymus serpyllum collected from the different localities of the mountains Rtanj and Ozren. Methods. Herbs of investigated plants were collected during July 2005 from various localities of Rtanj and Ozren mountains. After drying, homogenization and mineralization, Cd content was determined by atomic absorption spectrophotometry. Results. The obtained results show that Cd content varies significantly in Hypericum perforatum samples collected. The lowest Cd level was found in samples from the one of Rtanj localities (0.25 mg Cd/kg), while the highest was observed in Hypericum perforatum from Ozren locality (1.24 mg/kg). Levels of Cd in the three of four investigated localities were higher than pro posed by WHO (0.3 mg/kg dried herb material). In all investigated samples of Thymus serpyllum herbs Cd levels were below the limit of detection of analytical method (0.2 mg Cd/kg dried materials). Conclusion. This work contributes to the issue of Cd content in Hypericum perforatum and Thymus serpyllum grown in localities of Rtanj and Ozren, and implies the importance for systemic control of Cd content in Hypericum species in order to provide safety of their preparations. Furthermore, regarding Cd toxicity, maximal permissible level of Cd in plant material should be evaluated and established concerning national legislative frame.
The influence of mineral and bacterial fertilization on the number of fungi in soil under maize
Stanojkovi? Aleksandra B.,uki? Dragutin A.,Mandi? Leka G.,Mili?i? Bogi? M.
Zbornik Matice Srpske za Prirodne Nauke , 2011, DOI: 10.2298/zmspn1120205s
Abstract: The aim of this study was to evaluate the influence of an application of different rates of mineral fertilizers and their combination with associative N-fixing Klebsiella planticola and Enterobacter spp., and sampling period on the number of fungi in Cambisol and grain yield of maize. The investigation was conducted on Mladenovac experimental station and in the Laboratory of Institute of Soil Science, Belgrade, during 2006. Unfertilized soil was used as the control soil. Each of the studied variants was carried out in three replications. The effect of the studied fertilizers was determined three times during the maize growing season, the number of fungi being determined by indirect dilution method on Czapek nutritive medium. The results of the study showed that all fertilization variants studied influenced, more or less, fungal growth in the study soil. However, the applied high content of mineral nitrogen, phosphorus and potassium, as well as their combination with bacterial inoculants brought about the highest increase in the number of fungi during all studied vegetation periods of maize. The highest increase in the number of soil fungi was registered in the second sampling period. The highest increase in the grain yield of maize was obtained by combined application of microbial inoculants and high rates of mineral NPK fertilizers.
Analysis of effects of foreign bank entry on credit interest rate behavior in Serbia
uki? ?or?e
Panoeconomicus , 2007, DOI: 10.2298/pan0704429d
Abstract: Following foreign bank entry, credit interest rates have been extremely high in Serbia compared with a reference group of countries: Croatia, Bulgaria and Romania. This is connected with monetary authorities' poor predictions regarding the behavior of those banks in setting interest rates, creating an illusion that competition, per se, would rapidly result in decreasing interest rates; as well as undertaking monetary policy measures-such as an extreme increase in the reserve requirements rate-that contributed to unchanged or increased credit interest rates. The final outcome of poor predictions and measures undertaken by the National Bank of Serbia is limited to periodical appeals by its highest officials to citizens to consider the conditions under which they borrow from banks. However, under conditions of fully inelastic demand for bank credit and a cartel presence in the banking sector, such appeals are ineffective, merely reflecting an attempt to avoid responsibility for a possible wave of bankruptcies in the household sector. Only increasing competition among banks can lead to a significant decrease in credit interest rates in Serbia in the medium term. Empirical analysis shows that competition should be most intensive on the mortgage loan market.
Goran ?uki
Acta Medica Medianae , 2009,
Abstract: If the change is considered as something useful – as engaging new manpower having advanced conception – then the matter is correct. Why was the colonel dr Lazar Gencic, the medical corps officer of Supreme command of the Serbian army 1912-16 replaced? Why none of the critics in 1925 evaluated the ongoings during the typhus fever epidemic in 1914/15, which was the subject of Hanter`s investigations published in 1919? Judgments related to the activities of military health care in the epidemic of typhus fever were exaggerated; they did not start from the actual situation. The accusations addressed to the Head were unjustified because he was imputed “scientific exhaustion of the world medicine” which was following the course of typhus fever epidemic. He was at position of the medical corps officer when, indisputably, huge losses befell Serbia, with: 150000 deceased, of which 20000 in the the Army. We do not think the accusations were justified: Who doesn't remember our wandering in terms of prophylactic and other measures, that uncertainty, confusion which was mostly reflected in discordant and impossible commands; that lack of the most elementary ideas about disinfection, as well as lack in disinfection devices and so on. The cost of our mistakes was high. “In the history of epidemiology the remark about our ignorance of theory and practice in the typhus fever struggling of that time would stay recorded, and that is where the catastrophic losses come from in 1914-1915”. We will show that the critics are tactless; that they came “after finished battle”, after the solution had been found. We will give the arguments – that even in collective operations, the Head was successful: because he indirectly contributed to the the solution finding, providing undisturbed work of more competent ones, that is he never prevented anyone to express itself. He indirectly contributed to the social confirmation of the Nobel prize award for the field of medicine in 1928 to Charles Nicolle for discovering that body lice were carriers of typhus fever. That was approved by successful realization of measures during the epidemic 1914/15 in Serbia.
Goran ?uki
Acta Medica Medianae , 2011,
Abstract: U "prebakteriolo kom periodu“ razvoja svetske medicine izdvojen je pegavi tifus kao entitet. Otuda je stepen razvoja medicinske nauke uslovio konkretni na in dijagnostikovanja; svakako, druk iji od savremenog. Ovo dijagnostifikovanje je bilo na osnovu klini kog iskustva lekara i predlo enog dijagnosti kog sredstva. Godina ustanovljavanja entiteta pegavog tifusa bila je 1836., kada ga je W. Gerhard ustanovio putem obdukcione dijagnosti ke procedure, o emu je izvestio medicinsku javnost 1837. godine. Od tada, drugi lekari imaju obavezu da proceduru sprovedu i provere. Epidemijski pegavi tifus ustanovljen u Filadelfiji bio je "laboratorijski potvr en i epidemiolo ki povezan". Razvojem medicine usledila je kasnija potvrda entiteta etiopatogenezom ili drugim savr enijim metodama. Nasuprot ovom pristupu, stoji obi no, “rutinersko dijagnostikovanje” koje je mnogo manje pouzdano. U Kragujevcu je 1836. godine bio prisutan 'tifus'. Pegavi ar je bio povod tog ustanovljavanja, sudi se analizom dostupnih argumenata od 1879. do danas. Otuda je dijagnostikovanje u Milo evoj prestonici moglo da bude jedino nivoa ne-entiteta. Lekar u Srbiji, koji je pre prihvatio iscrpno, pa ipak, osporavano razmatranje Gerharda, bio je u prednosti da otkrije prvi entitet pegavog tifusa na njenom tlu. U Srbiji podvajanje vrsta tifusa i pri tome prepoznavanje pegavca vi eg nivoa od “klini ki potvr enog slu aja” otuda je usledilo posle Gerhard-ovog saop tenja 1837. godine. Tada, prilikom opisa neke naredne epidemijske pojave pegavog tifusa, trebalo je da bude ukazano da je primenjen isti kao Gerhard-ov na in ustanovljavanja entiteta ili pouzdaniji od njega. Acta Medica Medianae 2011;50(1):67-72.
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