Dissertationen zum Thema „Aktivnosti“
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Nemanja, Nedić. „Upravljanje tokovima aktivnosti u distributivnom menadžment sistemu“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=96420&source=NDLTD&language=en.
Der volle Inhalt der QuelleThе paper presents an approach how to improve performance of larger scale distributed utility management system such as DMS. This goal is accomplished by using an intelligent workflow management. Workflows are divided into the atomic tasks which are scheduled to computing resources for execution. For these purposes various scheduling algorithms are developed and thoroughly tested. This approach has provided greater utilization of computing resources which further have resulted in better performance.
Slobodan, Pavlović. „Prediktori fizičke aktivnosti na času fizičkog vaspitanja“. Phd thesis, Univerzitet u Novom Sadu, Fakultet sporta i fizičkog vaspitanja u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=103878&source=NDLTD&language=en.
Der volle Inhalt der QuelleBearing in mind that the physical activity ofstudents in physical education classes isinsufficient, research was conducted in order todetermine the factors of which depends mostlyon physical activity of younger school agestudents in the classroom physical education. Thestudy included 272 subjects (127 boys, 145 girls),third and fourth grades of elementary schools inthe town of Uzice. The general aim of theresearch, in accordance with the issue and thesubject of research is to examine thecontributions of individual personal, behavioraland social factors, physical activity pupils ofyounger school age at the time of physicaleducation. The results show that physical activityof parents (fathers), has the highest prediction ofthe physical activity of younger school agestudents in the classroom physical education.Then, after the predictability follow: motorstatus, physical activity of students in his sparetime, morphological characteristics, physical selfconceptand motivation.
Radomir, Malbaša. „Istraživanje antioksidativne aktivnosti napitka od čajne gljive“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2004. https://www.cris.uns.ac.rs/record.jsf?recordId=71474&source=NDLTD&language=en.
Der volle Inhalt der QuelleAbstract was processed by technology for Optical character recognition (OCR).The antioxidant activity of differently prepared beverages and fermentative liquids of tea fungus was examined, primarily by following of ability for transformation and stabilization of reactive hydroxyl-radicals and reduction of stable 1,1- diphenyl-2-picrylhydrazyl (DPPH) radicals. Some of the metabolites of kombucha that act as antioxidants (vitamins B2 and C) and organic acids that stabilize tea fungus beverage were determined. The primary used analytical techniques were ESR, HPLC, TLC, spectrophotometry of products of enzymatic reactions and voIumetry.
Mirjana, Sujić Stamenić. „Uticaj investicija na transformaciju i poslovne aktivnosti preduzeća“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114166&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe subject of research in the dissertation is the analysis of the impact of investmentson transformation and business activities of the company with special emphasis on theresearch of the performance of the application of the investment model, as a functionof effective and efficient process of transformation of the company.The overall objective is to determine the performance of investments, that is, theimpact of investments on the flow and effects of transformation and business activitiesof companies in the Republic of Serbia.The result of the research is that foreign direct investments in the countries of theregion are of negligible indirect importance for the stock exchange of the Republic ofSerbia, and therefore for the economic growth of the Republic of Serbia.
Mironova, Irina Aleksandrovna. „Vlijanie solnečnoj aktivnosti na prozračnostʹ atmosfery i optičeskie svojstva aėrozolja /“. Sankt-Peterburg : Sankt-Peterburgskij Gos. Univ, 2005. http://www.gbv.de/dms/goettingen/516643525.pdf.
Der volle Inhalt der QuelleEngl. introd. and Engl. summary. - Literatura S. 112 - 127. Sovmestnaja dissertacija meždu Sankt-Peterburgskim Gosudarstvennym Universitetom i Universitetom g. Potsdam.
Zdenka, Dudić. „Razvoj modela za ocenu inovativnih aktivnosti malih i srednjih preduzeća“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107265&source=NDLTD&language=en.
Der volle Inhalt der QuelleMeasuring innovative activities is important in order to manage and operate the enterprise more effectively. Many tools appeared on the market, but most of them measured the business success based on financial results. The Balanced Scoredcard (BSC) model, however, included all the aspects of the company, not just a financial component, and it was proven to be an effective tool. The emergence of this model created synergy throughout the company, because this model enabled identification of the strategic indicators that the company should achieve in order to improve its business. This paper shows the current situation regarding to innovation and the introduction of innovative activities in business operations in the territory of the Republic of Serbia, but also explores whether the BSC model is applicable for the evaluation and monitoring of innovative activities in enterprises. A modified BSC model with very carefully selected factors with a focus on innovative activities is a good auxiliary tool for measuring and continuously monitoring the performance of the company. The application of such tools in small and medium-sized enterprises would improve their business.
Gorana, Mijatović. „Dekompozicija neuralne aktivnosti: model za empirijsku karakterizaciju inter-spajk intervala“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107498&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe advances in extracellular neural recording techniquesresult in big data volumes that necessitate fast,reliable, and automatic identification of statisticallysimilar units. This study proposes a single frameworkyielding a compact set of probabilistic descriptors thatcharacterise the firing patterns of a single unit. Probabilisticfeatures are estimated from an inter-spikeintervaltime series, without assumptions about the firing distribution or the stationarity. The first level of proposedfiring patterns decomposition divides the inter-spikeintervals into bursting, moderate and idle firing modes,yielding a coarse feature set. The second level identifiesthe successive bursting spikes, or the spiking acceleration/deceleration in the moderate firing mode, yieldinga refined feature set. The features are estimated fromsimulated data and from experimental recordings fromthe lateral prefrontal cortex in awake, behaving rhesusmonkeys. An effcient and stable partitioning of neuralunits is provided by the ensemble evidence accumulationclustering. The possibility of selecting the number ofclusters and choosing among coarse and refined featuresets provides an opportunity to explore and comparedifferent data partitions. The estimation of features, ifapplied to a single unit, can serve as a tool for the firinganalysis, observing either overall spiking activity or theperiods of interest in trial-to-trial recordings. If applied tomassively parallel recordings, it additionally serves as aninput to the clustering procedure, with the potential tocompare the functional properties of various brainstructures and to link the types of neural cells to theparticular behavioural states.
Strahinja, Kovačević. „HEMOMETRIJSKO MODELOVANJE HROMATOGRAFSKOG PONAŠANJA I BIOLOŠKE AKTIVNOSTI SERIJE ANDROSTANSKIH DERIVATA“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=94846&source=NDLTD&language=en.
Der volle Inhalt der QuelleSteroidal compounds belong to the group of substances with wide spectrum of biological activity and represent the basic material for synthesis of many derivativeswith preferred biological potential. A grate number of steroidal derivatives have beenobtained through organic syntheses, many of which have demonstrated significantbiological activity, such as cytotoxicity toward various cancer cell lines. Characterization of newly synthesized compounds can be achieved experimentallyand by computational approach (in silico). This doctoral dissertation describesexperimental determination of lipophilicity of 17α-picolyl and 17(E)-picolinylideneandrostane derivatives applying reversed-phase high pressure liquid chromatography followed by quantitative structure-retention relationship (QSRR)chemometric analysis of chromatographic behaviour (chromatographic lipophilicity).Chemical structure of the analyzed derivatives was described numerically by in silicomolecular descriptors. The second part of this dissertation describes quantitativestructure-activity relationship (QSAR) analysis of cytotoxic activity of 17α-picolyl and17(E)-picolinylidene androstane derivatives toward androgen-receptor negativeprostate cancer cell line (AR-neg. PC-3). Selection of the best QSRR and QSARmodels was carried out based on their statistical parameters, and their ranking wasdone by sum of ranking differences (SRD) method. Besides the regression QSRR and QSAR chemometric methods, cluster analysis and principal components analysis were conducted in order to reveal possible similarities and dissimilarities among the studied derivatives on the basis of calculated molecular descriptors.
Maja, Strugar Jelača. „Uticaj dinamike inovacija na kreiranje modela menadžment aktivnosti u organizacionim sistemima“. Phd thesis, Univerzitet u Novom Sadu, Ekonomski fakultet u Subotici, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95345&source=NDLTD&language=en.
Der volle Inhalt der QuelleDragana, Vujović Đermanović. „Model poslovnog rešenja za komunikacione aktivnosti primenom”softvera kao usluge (SAAS)"“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=105465&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe paper explores the way readers accept advice on blogs. The paperintegrates the Technology Acceptance Model with dual process informationmodel, in order to obtain a theoretical model for advice adoption. The modelemphasizes the importance of the usefulness and credibility of eWOM as themediators in the process of advice adoption.Dual process models are applied in the paper to identify the factors thatcontribute the usefulness of information, in a different process of elaborationof these information. The research was conducted on the SAAS platformBeashaper. A mixed method of research was conducted. The first part of thereseach was an interview with the sample of 25 influencers. After qualitativepart of the study, a quantitative survey was conducted on the sample of 356users who adopted blog advice. The study confirmed the proposed model.Communication on the Internet is gaining significance in the recent years.This research suggest a model for understanding knowledge transfer on theblog platform, through computer-based communication.
Agota, Vitkai Kučera. „Karakteristike glasa i metodički pristupi razvoju glasa u funkciji profesionalnih aktivnosti“. Phd thesis, Univerzitet u Novom Sadu, Asocijacija centara za interdisciplinarne i multidisciplinarne studije i istraživanja, 2013. https://www.cris.uns.ac.rs/record.jsf?recordId=94953&source=NDLTD&language=en.
Der volle Inhalt der QuelleThis PhD thesis aims to establish the state of voice in future elite vocal professionals (drama students), to compare it with the state of voice in students of non-vocal professions, to determine the methodic procedures for the voice development, as well as to ascertain the effects of vocal exercises by application of “WIC” technique on the state of voice in respondents who were found to suffer from the vocal disorder.
Zoran, Putnik. „Prilozi razvoju elektronskog učenja – Mogućnosti konverzije nastavnih aktivnosti i materijala u elektronski oblik“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2014. http://dx.doi.org/10.2298/NS20140214PUTNIK.
Der volle Inhalt der QuelleThe research topic involves description of eLearning concepts, depiction of need, motivation and methodology for processing and conversion of existing traditional teaching materials, regardless of their physical form and content, into contemporary and up-to-date electronic teaching material, learning objects. The idea is that these learning objects are created in such a way that they can be used, if possible also reused, in some of the learning management systems.The other primary research topic is the description, definition and practical testing of methodologies for the development of collaborative and communicative skills with students. Those skills are, as a part of the transfer from the classroom to the field of eLearning, substituted with electronic activities which are the standard and usual part of learning management systems. Within the thesis, application of typical activities of so-called Web 2.0 technologies: forums, chat-systems, Wiki and blog technology, but also methodologies for on-line assigning, solving, audit, and assessment of individual and team assignments.Finally, systematization of various methodologies of digital teaching material use is presented, together with the methods of their depiction by meta-model. Examples of currently existing tools available for eLearning are presented and a model is suggested, together with the potentially useful tools that might help in automatization of a process of conversion of teaching materials and their use in learning management systems.
Jelena, Pejin. „Ispitivanje sadržaja i antioksidativne aktivnosti fenolnih kiselina u toku proizvodnje slada i piva“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2009. https://www.cris.uns.ac.rs/record.jsf?recordId=71284&source=NDLTD&language=en.
Der volle Inhalt der QuelleStudies carried out in the frame of the doctorial thesisaimed at continuous determination of the content oftotal phenolics, phenolic acids and antioxidant activity(antiradical activity on DPPH and hydroxyl radicals)during malt and beer production (in barley, steepedbarley, green malt, malt, wort, hopped wort,fermenting wort, green beer, and beer) produced fromthree accepted brewer’s barley varieties: NS 525, NS565, and NS 583.The total phenolics content in the barley samples was0.76 for NS 525, 0.75 for NS 565 and 0.70 mg GAE/gdry matter (d.m.) for NS 583. Higher content of totalphenolics was determined in the malt samples incomparison with the barley samples: (0.96, 0.94, and0.91 mg GAE/g d.m. for NS 525, NS 565, and NS 583,respectively). Variety NS 525 was the highest in totalphenolics content during all stages of malting whencompared to the other varieties. The lowest content oftotal phenolics was found in the variety NS 583.In all examined samples, ferulic, p-coumaric andvanillic acid dominated in the barley samples, duringmalting and in the produced malts.Content of total phenolic acids in the barley sampleswas 200.98 for NS 525, 184.10 for NS 565 and 177.27mg/g d.m. for NS 583. During steeping, the content oftotal phenolic acids increased for all samples reachingthe maximum at the first day of germination (NS 525 –548.31; NS 565 – 518.65, and NS 583 – 517.17 μg/gd.m.). The obtained results revealed that the maltingprocess had significant impact on the content of totaland individual phenolic acids.Variety NS 525 showed the highest antiradical activityon DPPH radicals (EC50 for NS 525 was 0.658, for NS565 0.667, and for NS 583 0.758 mg/ml) indicating thatbarley variety influences the antiradical activity onDPPH radicals. Antiradical activity on DPPH radicalssignificantly increased during steeping for allinvestigated barley varieties. Higher antiradicalactivity on DPPH radicals was determined inproduced malts when compared to correspondingbarley varieties. Similar increasing and decreasingtrends in the antiradical activity on DPPH radicalsduring malting were observed in all investigatedbarley varieties.The antiradical activity on hydroxyl radicals,expressed as EC50 value, in investigated barleyvarieties, was: 0.325 for NS 525, 0.385 for NS 565, and0.455 mg/ml for NS 583. It can be concluded thatbarley variety NS 525 showed the highest antiradicalactivity on hydroxyl radicals. The antiradical activityon hydroxyl radicals significantly increased duringsteeping. Higher antiradical activity on hydroxylradicals was determined in produced malts whencompared to corresponding barley varieties. Similarincreasing and decreasing trends in the antiradicalactivity on hydroxyl radicals during malting wereobserved in all investigated samples.Variety NS 525 had the highest content of totalphenolics and exhibited the highest antioxidantactivity that is antiradical activity on DPPH andhydroxyl radicals. These results suggest that varietycan influence the malt antiradical properties. VarietyNS 525 was the highest in total phenolics content, totalphenolic acids content and antiradical activity onDPPH and hydroxyl radicals during malting.The highest contents of ferulic, p-coumaric, vanillic,and sinapic acids were determined in all wort, hoppedwort and beer samples. Increased contents of allphenolic acids were observed after hopping. Thehighest content of total phenolic acids was determinedin the hopped worts (461.41 for NS 525, 426.22 for NS565, and 423.56 μg/100 ml for NS 583. The beerscontained less total phenolic acids when compared tothe corresponding hopped worts.Wort produced from NS 525 malt showed the highestantiradical activity on DPPH and hydroxyl radicalswhich indicates that the antiradical activity of maltcomponents affects the antiradical activity in producedwort. After hopping, antiradical activity on DPPH andhydroxyl radicals significantly increased in all worts.The antiradical activity on DPPH and hydroxylradicals decreased during primary and secondaryfermentation.Wort produced from NS 525 malt contained thehighest total phenolic content, total phenolic acidscontent and showed the highest antiradical activity onDPPH and hydroxyl radicals. During beer production,content of total phenolic compounds slightly decreasedwhich indicates that production process had aninfluence on their content. Similar decreasing trendsbetween the antiradical activity on DPPH andhydroxyl radicals and the contents of total phenolicsand total phenolic acids during beer production wereobserved.The applied GC-MS method for determination ofphenolic acids contents during malt and beerproduction was sensitive, specific and had goodrepeatability. It can be used for determination ofphenolic acids content in barley, steeped barley, greenmalt, malt, wort, hopped wort, during fermentationand in beer.The content of total phenolics, phenolic acids andantioxidant activity of malt used for beer productionhave significant influence on the beer antioxidantactivity. Understanding how the phenolic acids andantioxidant activity change during malt and beerproduction can provide valuable information aboutthe protection of endogenous antioxidants in beerproduction. In this way, the production of beer withenhanced antioxidant activity is possible and thereforehigher resistance to lipid oxidation and longer shelflifecould be introduced.
Vladimir, Krstić. „Uticaj faktora rizika na povređivanje prednje ukštene veze kolena u toku sportskih aktivnosti“. Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114831&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe study group consisted of 1247 respondents with anterior cruciate ligament injuries who were surgically treated in the period 2012-2017. at the Clinic for Orthopedic Surgery and Traumatology of the Clinical Center of Vojvodina. The objectives of the study were to determine the impact of sports activity levels and injury mechanisms on the occurrence of anterior cruciate ligament injuries, then the impact of external risk factors (type of sport, competition rank, type of surface, training or match, training period) on the occurrence of anterior cruciate ligament injuries and the influence of internal risk factors (gender, age, BMI) on the occurrence of injuries of this knee structure. Out of the total number of respondents 517 (41.5%) were active athletes, and 730 (58.5%) were recreational athletes. A significant majority in the observed group were men (82.6%), persons aged 16 to 25 years (62.6%) and normal BMI respondents (62%). Anterior cruciate ligament injury occurred in 504 of them (40.5%) during active sports, while injuries during recreational sports occurred in 741 respondents (59.5%). Among active athletes, more than two thirds competed at the international or national level- in the highest ranks of the competition. Contact collective sports (football, basketball and handball) were practiced by 77.9% of respondents. 22.1% of respondents practiced non-contact sports such as volleyball, martial arts sports and skiing. The largest number of injuries occurring while playing football (51.3%). Statistically significantly more injuries (both during active and recreational sports) occurred without direct contact (noncontact injuries-78,7% of total injuries number), with the largest number of injuries caused by changes in the direction and rhythm of movement. Among active athletes, most injuries occurred in matches (73.8%), followed by injuries in training (24.1%), while only 2.1% of respondents were injured in recreation. Significantly more injuries occurred in the middle of engaging in sports activity (47.4%) compared to injuries during the warm-up, beginning and end of sports activity. Injuries occurred significantly more often on grass (42%) and floor (28%) than on other types of surfaces. Most of the respondents were injured wearing sneakers while doing sports. There are significant differences in the context of injury depending on the gender of the respondents. A significantly higher percentage of women were injured during active sports, while men were more often injured during recreational sport activities. Women were most often injured in handball, men in football. Compared to men, injuries were much less common in women during direct contact, and when it comes to the place of injury, women were injured more often than men during training acitivities. Over 50% of women were injured on the floor, while the largest number of men were injured on the grass. Subjects with overweight were significantly more likely to be injured during recreational sport acitivites, while those with normal BMI were more likely to be injured during active sports. Risk factors for anterior cruciate ligament injuries are numerous and specific and there are risks for each population category, but it is noticed that in all sports, on all surfaces and in all subjects, injuries were most often caused by a noncontact injury mechanism. The formation of a Register of injuries would enable a better understanding of risk factors and their mutual influence, as well as the definition of the profile of persons at greatest risk for the occurrence of an anterior cruciate ligament injury. This would provide the necessary information for planning prevention programs aimed at reducing the risk of injury and would enable the implementation of appropriate selective prevention measures.
Nataša, Simin. „Sekundarni biomolekuli u vrstama Allium sect. Codonoprasum Rchb. – biološke aktivnosti, fitohemijski i hemotaksonomski aspekti“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=91799&source=NDLTD&language=en.
Der volle Inhalt der QuelleIn the present doctoral thesis the chemical composition and biological activities of 10 wild growing taxa of genus Allium sect. Codonoprasum (A. carinatum subsp. pulchellum, A. carinatum subsp. carinatum, A. fuscum var. gracile, A. fuscum var. fuscum, A. flavum subsp. flavum, A. melanantherum, A. oleraceum, A. paniculatumsubsp. marginatum, A. pallens subsp. tenuiflorum and A. rhodopeum) were investigated. The samples were collected from 27 locations in Serbia. The aim of the study was to obtain data on the content of biologically active compounds in extracts of these unexplored species of the genus Allium and to determine their potential medicinal value.Phytochemical caracterisation included: headspace GC-MS analysis of fresh bulb volatiles, LC-DAD-MS and LC-MS-MS qualitative analysis of methanol extracts, LC-MS-MS quantitative analysis of 44 selected phenolic compounds in methanol extracts, determination of total monomeric anthocyanins content and alliinase activity. In order to assess the biological potential of methanol extracts, the antioxidant, anti-inflammatory, antimicrobial, antimutagenic, genotoxic and antiproliferative activities of the extracts were studied.Summing up all the results obtained, it can be concluded that species of genus Allium sect. Codonoprasum are rich sources of biologically active compounds with a broad spectrum of biological activities. Dimethyl disulfide is the most dominant and often the only volatile component of most species, which is significant from chemotaxonomic point of view. The methanol extracts of investigated species contain high levels of flavonoids (primarily quercetin derivatives). Specificity of A. pallens and A. oleraceum extracts is that they do not contain rutin, but contain hyperoside, while small quantity of phenolic compounds is characteristic for A. rhodopeum extract. All investigated species, except of A. flavum, are rich in anthocyanins. Alliinase activity was high in all examined species. Most of the extracts, except A. carinatum and A. melanantherum extracts, express considerable antioxidant activity, while extracts of A. flavum, A. rhodopeum, A. paniculatum and A. oleraceum are potent anti-inflammatory agents. The investigated Allium extracts did not show antimicrobial and antimutagenic activity. Also, the extracts did not express genotoxic effect on healthy tissue cells (except the weak genotoxic effects of aerial parts extract of A. flavum), indicating that the use of these species as a food or as a drug is safe. Whole plant extracts of A. paniculatum and A. rhodopeum, as well as aerial parts extract of A. melanantherum showed strong antiproliferative activity (with a favorable non-tumor/tumor ratios) and induced apoptosis in tumor cells, suggesting that these plants have a high potential for application in antitumor therapy.
Sofija, Bekić. „Razvoj bioloških testova za identifikaciju liganada steroidnih receptora i ispitivanje aktivnosti steroidogenog enzima aromataze“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114417&source=NDLTD&language=en.
Der volle Inhalt der QuelleIn this doctoral dissertation, a fluorescent assay in yeast was developed for identification of potential natural or synthetic ligands of ERα, ERβ or AR andquantification of their binding affinity, as well asevaluation of the estrogenic potential of synthetic steroids and selected plant extracts rich in phytoestrogen content. The assay could be used to screen libraries of modified steroids and xenoestrogens. In order to better understand the biomedical potential of selected modified steroids, results were compared to antiproliferative activity against estrogen receptor positive breast cancer (MCF-7) and prostate cancer (PC-3) cell lines. Binding energies and the geometry of binding of these compounds for ERα and ERβ ligand binding domains were predicted in silico by molecular docking methods. The second part of this study includes development of an assay for study of aromatase activity in the presence or absence of inhibitors by heterologous expression of human aromatase in Saccharomyces cerevisiae and/or Escherichia coli cells, as model-organisms. Furthermore, interactions between modified steroids, selected according to their structure, and aromatase were tested using sensitive spectroscopic methods based on ligand-induced changes in the spin state of Fe from the heme group or changes in the fluorescence of a tryptophan residue in the active site. The non-radioactive in vitro assays developed here, besides high efficiency, user and environmental safety, also have greater specificity and are more cost-effective for preliminary screening of steroid receptor ligands and aromatase inhibitors. Additionally, compounds identified to express significant biological activity can serve as a basis for the development of potential therapeutics in the treatment of hormone-dependent diseases and conditions, a global health issue today.
Nevena, Ćurčić. „Kvalitativna ocena sredstava turističke propagande i primenjenog materijala u funkciji unapređenja promotivnih aktivnosti u turizmu“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2008. https://www.cris.uns.ac.rs/record.jsf?recordId=73217&source=NDLTD&language=en.
Der volle Inhalt der QuellePromotion is the term denoting all the ways of complex communication between a company that provides services and real and potential customers, providers, creditors, the employed, local self-government, and with wider social community. In its strategic actions, promotion relies on the following tools: advertising, personal selling, sales promotion, public relations and publicity, sponsorship, direct and database marketing, word-of-mouth marketing. Propaganda is one of the oldest and large-scale promotion tools, widespread in tourist activities because it plays a big role in presenting tourist offer (especially its impalpable elements) to potential customers. Propaganda utilizes wide range of propaganda tools while implementing its aims and tasks: graphic, advertisement tools, projection, space-plastic, and interactive tools. According to the poll conducted in our country, people still rely the most on word-of-mouth promotion, and use it most often when they try to acquire valid information about traveling to a certain destination. The poll established that combined tools and prospects are the most significant in the graphic group of tools because of their availability, abundance of information, and complexity. Among propaganda graphic tools, tourists are most attracted by photographs i.e., full-color photographs with motives that were chosen properly to convey comprehensible, detailed, and true message. Thus, there is less need for text and this economizes on the volume of those tools. Geographic maps and sketches are also of great importance in determining geographical coordinates of a place or locality. Huge percentage of tourists (around 60%) pays attention and uses maps from propaganda tools. Thus, the map-makers should pay good attention when drawing them because that would increase total serviceable value of propaganda tools, and tourists would have a good layout of the area and it would not be hard to find the way. Besides the printed tools, TV and Internet are media tools that are prominent in their importance in informing and animating tourists. With TV, almost all forms of propaganda are equally important: reports, tourist films, advertisements, while Internet was a surprise according to the results because it is still assumed that it is not so wide-spread in our country. Tasks and character of tourist propaganda require certain quality tools and ways of its functioning. Taking into account strong competition at the tourist market and the fact that propaganda is an important element in tourist development, the quality is an important precondition. What makes the quality element in tourist propaganda? It would not be easy to give a definite reply to this question, because these are the elements that are constantly amended, improved, visually upgraded by the practice. However, some elements could be measured, their values qualified, and at the end the evaluation of quality could be produced, and it would then be the integral part of planning future propaganda campaigns and actions.
Radovan, Živanović. „Turistička organizacija rekreativnih aktivnosti Savezne Republike Nemačke i mogućnosti njihove primene na Srbiju i Crnu Goru“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2006. https://www.cris.uns.ac.rs/record.jsf?recordId=73216&source=NDLTD&language=en.
Der volle Inhalt der QuelleFederal Republic of Germany is an optimal example for study of tourist recreation because its all developing phases can be observed from the aspect of positive and negative factors, influencing the above stated phases. This highly developed country with high level of living standard and awateness concerning significance of recreation with maximum protection of the environment are main motive for preparation of this doctor's thesis. German is a country of emitive and imitive tourist mevements. The doctor's thesis has been presented through six thematic chapters, reaching the conclusion by methods of comparations and syntesis. Thematic chapters were aiming at showing and analyzing of all valid natural and anthropoid lements which are a base for study of tourist recreation. Tourist-geographical survey of Serbia and Montenegro has been give briefly and saved only as a base for kind of identification with German expiriences that can be really implemented. According to the all six complementary parts, the conclusions have been reached by method of syntesis and comparations.
Aleksandra, Gavarić. „Savremene metode ekstrakcije očajnice (Marrubium vulgare L.) i sušenje odabranih ekstrakata, hemijski sastav i biološke aktivnosti“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114456&source=NDLTD&language=en.
Der volle Inhalt der QuelleWithin the scope of this dissertation, the possibilities of applying modern methods for obtaining liquid (ultrasonic extraction, microwave extraction and subcritical water extraction) and lipophilic extracts (extraction with supercritical carbon dioxide) rich in polyphenols from the aboveground part of white horehound (Marrubium vulgare L.) were examined. Liquid extracts were optimized using an experimental design and response surface method, and subjected to spray drying. Liquid and dry extracts have been extensively examined for their chemical composition and biological activity, antimicrobial and in vitro antihyperglycaemic activities.For each of these extraction techniques, the influence of the main parameters was examined: ultrasonic extraction (temperature, extraction time and ultrasound power), microwave extraction (ethanol concentration, extraction time and microwave power) and subcritical water extraction (temperature, extraction time and HCl concentration in the extractant). Liquid extracts obtained by ultrasonic and microwave extraction under optimized conditions revealed the presence of chlorogenic acid and quercetin, which were not detected in macerates. The antimicrobial activity of both extracts was examined and B. cereus was found to be the most sensitive bacterial strain, whereas in the case of yeast S. cerevisiae was particularly sensitive to both extracts. In addition to this activity, the in vitro antihyperglycaemic activities of both extracts against α-amylase and α-glucosidase were investigated, with ultrasound extract showing higher antihyperglycemic activity (50.63% inhibited α-amylase and 48.67% inhibited α-glucosidase) which could potentially be explained by the presence of chlorogenic acid (33.11 μg/mL) and quercetin (34.88 μg/mL). In the subcritical extract, obtained under optimal conditions, only the presence of hydroxy methylfurfural was detected, and this extract was not subjected to antimicrobial and antihyperglycemic activity.For the extraction of lipophilic components of M. vulgare, distillation of essential oil (0.05%), Soxhlet extraction (3.23%) and extraction with supercritical carbon dioxide at pressures of 100, 200 and 300 bar and at temperatures of 40, 50 and 60 ° C were applied. The most dominant component in all the supercritical extracts obtained is the chemotaxonomic marker marubiin, which was not identified in the Soxhlet extract.The liquid extracts obtained by the ultrasound and microwave extraction under optimized conditions and the macerate were spray dried (with the addition of 10 and 50% maltodextrin) to obtain a more stable form of the dry extract. Dry extracts underwent determination of the most important physical properties and chemical composition as well as antimicrobial and antihyperglycemic activities to evaluate their incorporation into functional foods, dietary supplements or in the formulation of various finished dosage forms that are administered preventively or to improve human health.
Jelena, Ćurčić. „In silico određivanje fizičko-hemijskih, farmakokinetskih i toksikoloških parametara i in vitro ispitivanje antiproliferativne aktivnosti novosintetisanih derivata N-sukcinimida“. Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=113945&source=NDLTD&language=en.
Der volle Inhalt der QuelleSuccinimides have exhibited various pharmaceutical effects including antiproliferative activity due to an important structural fragment (a pharmacophore) presented in form of two hydrophobic regions and two electron-rich centers. Current development of new drugs involves modifications in structure (type, position and orientation of substituents) and usage of in silico computational programs to predict and optimize pharmacokinetic and safety profile of drug candidates. In early phase of drug development, databases regarding the molecular, pharmacokinetic and toxicological parameters of already tested compounds are used, mathematical models and algorithms are applied for predicting the properties of new molecules and inadequate candidates are eliminated saving time and resources. Determination of physico-chemical properties of the analyzed methyl-ethyl-N-phenilsuccinimide derivatives by software packages; virtual pharmacokinetic and toxicology screening; investigation of retention behavior of the compounds by the reversed-phase HPTLC analysis and calculation of retention constants and their correlation with lipophilicity; in vitro evaluation of antiproliferative activity toward five carcinoma cell lines and normal fetal lung cell line; molecular behavior study on target estrogen receptors by molecular docking and correlation of antiproliferative activity toward ER+ breast carcinoma cell lines and in silico estrogen receptor affinity binding. Retention behavior of 11 newly synthesized succinimide derivatives was determined by reversed phase high performance thin layer chromatography (RP HPTLC) with the application of two-component mixtures water - organic solvent (methanol, acetonitrile or acetone) with adequate volume fractions of the organic modifier. After chromatographic development RM0 and S parameters were calculated. The logarithm of partition coefficient, logP for the analyzed compounds were calculated by different softwares. Physico-chemical properties, pharmacokinetic and toxicological parameters, aquatic toxicity and relative affinity to estrogen receptors were predicted in silico. The affinity toward 4 types of receptors (G-proteine coupled receptors, ion channels, kinase inhibitors, nuclear receptors) were calculated as well. Standard MTT assay was applied to evaluate cytotoxic activities of the analyzed succinimides after cells were exposed. Antiproliferative activity were investigated toward commercial MRC-5, A549, HeLa, MDA-MB-231, MCF-7, HT-29 cell lines and IC50 values were calculated for each compound. MolDock Score that represents energy of binding to estrogen alfa and estrogen beta receptors was determined by molecular docking. Statistically significant linear correlations were determined between the chromatographic retention constants (RM0 and S) and calculated logP, and the best two were obtained in correlation of retention constants with MlogP and ClogP. The examination of RM0 and S influence on pharmacokinetics indicated parabolic dependence of the absorption constant (Ka) and plasma protein binding predictor (PPB) from the observed constants while the volume of distribution (Vd) and the ability to cross the brain blood barrier (logBBB) had linear association with the retention parameters. The toxicity of the analysed compounds evaluated in silico as LD50 on rodents was lower in comparison with the drugs with succinimide structure that are on the market and had parabolic correlation with the RM0 and S values. The experiments indicated that none of the compounds examined had cytotoxic activity toward the healthy lung fibroblast cells. The results of the in vitro assay shown that none of the investigated compounds demonstrated antiproliferative activity toward fetal lung cells. The most potent antiproliferative agents were compounds 6 and 7 toward MCF-7 cell line, and compound 11 toward A549 cell line. Molecular docking shown lower energy for binding to ERA in comparison to ERB.
Marija, Jelić. „Ispitivanje 8-hidroksi-2-deoksiguanozina, produkata lipidne peroksidacije i aktivnosti antioksidativnih enzima kod prekanceroznih lezija i u karcinomu grlića materice“. Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=110296&source=NDLTD&language=en.
Der volle Inhalt der QuelleFree radicals are produced in our body under physiological conditions. Although in very low concentrations, they can show some toxic effects. While trying to bind electrons, in the chemical reaction of oxidation, they rapidly and unpredictably bind to adjacent molecules- proteins, lipids, carbohydrates and nucleic acids from which the structural elements of the cell are made, triggering the internal pathway of apoptosis. Antioxidants are substances that prevent or significantly reduce the oxidation of biomolecules. Oxidative stress is a condition that occurs when the production of free radicals exceeds the capacity of antioxidant enzymes to neutralize them. The antioxidant enzymes include: superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), and glutathione-S-transferase (GST). Lipid Peroxidation (LP) is the process of oxidation of polyunsaturated fatty acids by free radicals. Malondialdehyde is a biochemical marker by which it is possible to measure the degree of oxidative damage of cell membranes. The oxidative modification of DNA leads to a change in DNA structure that results in genetic damage. The most commonly used marker of oxidative stress is urinary 8-hydroxy-2-deoxiguanosine (8-OHdG). The damage to proteins, lipids and DNA is an important basis for many diseases such as atherosclerosis, neurodegenerative diseases, diabetes, obesity, aging, retinopathy, chronic inflammatory disease and cancer. Starting from the hypothesis that these biomolecules are different at different stages of the disease, they could represent a prognostic marker of the progression of the disease. The aim of the study was to examine whether there were differences between the control group (healthy women), the patients with precancerous lesions on the cervix (HSIL), the patients with early stage cervical cancer (FIGO Ia-Ib) and the patient with locally advanced cervical cancer (IIa - IV) in the indicators of DNA damage (determining the value of 8-OHdG), indicators of oxidative stress (by determining the lipid peroxidation intensity (TBARS)), indicators of antioxidant defense (by determining the activity of antioxidative enzymes of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase GPx), glutathione reductase (GR), and glutathione-S-transferase (GST)). In addition, the aim of the study was to compare the values of 8- OHdG, lipid peroxidation products (TBARS) and the activity of antioxidant enzymes (SOD, CAT, GST, GPx, GR) within the group of patients with early stage cervical cancer divided into two subgroups- with low and high risk in relation to the relapse of the disease. The research was performed at the Clinic for operative oncology, Department of Gynecology at the Institute of Oncology of Vojvodina, Medical Faculty in Novi Sad, Department of Pharmacy and the Institute for Health Care of Novi Sad in the period from 2013 to 2017. Samples of blood and urine of the patients were collected, prepared adequately and stored at -80 ° until the analysis. The activity of the antioxidant enzymes as well as the lipid peroxidation were determined by spectrophotometric methods, and the concentration of 8-OHdG was determined by gas chromatography with mass detection. The approval of the Ethical Committee of the Institute for Oncology of Vojvodina was obtained before conducting the research. It has been shown that there are statistically significant differences between the control group (healthy women), patient with precancerous cervical lesions (HSIL), the patients with early stage cervical cancer (FIGO Ia-Ib) compared to a group of patients with locally advanced cervical cancer (IIa-IV) in indicators of damage to DNA (concentration of 8-OHdG), indicators of oxidative stress (lipid peroxidation (TBARS)), indicators of antioxidant defense (activities of antioxidant enzymes SOD, CAT and GST). There was no difference between the groups in activity of glutathione peroxidase enzyme (GPx) and glutathione reductase (GR). There were no differences in the concentration of 8-OHdG, lipid peroxidation products (TBARS) and the activity of antioxidant enzymes (SOD, CAT, GST, GPx and GR) within the group of patients with locally restricted cervical cancer divided into two subgroups with low and high risk in relation on relapses of the disease. CAT and GST activities were the best predictors of disease recurrence among defined groups. Based on the activities of these two oxidative enzymes, the separation of the group of patients who did not experience disease recurrence after a follow-up period from the other two groups in which recurrence of the disease occurred was possible. Based on the obtained results it is concluded that it is possible to use the studied biomarkers as diagnostic markers in patients with cervical cancer. These biomolecules can help in the patient's classification into certain groups according to the stage of the disease, and consequently the more efficient choice of appropriate treatment. In addition, CAT and GST enzyme activity have been shown to be predictors of disease recurrence in defined patient groups.
Bojana, Vasiljević. „Mikrotalasno stimulisana sinteza odabranih derivatanaftenskih i žučnih kiselina, ispitivanje njihove biološke aktivnosti kao i termičke i hemijske stabilnosti odabranih lekova“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=87894&source=NDLTD&language=en.
Der volle Inhalt der QuelleScientific research predicted in this PhD thesis isdirected to ascertainment new, efficient and faster microwave-assisted methods of chemical transformations in the absence of catalysts and/or organic solvents. Applaying special silicon-carbide reaction vessels, speed and accuracy of microwave-assisted transformations are ilustrated within stress testing of active pharmaceutical ingredients in HPLC/GC vials placed in SiC plate. Existence of nonthermal microwave effects and their influence on accurate interpretation of microwave synthesis results are also investigated. In the second part of this thesis microwave-assisted synthesis of potentionally biologically active compounds from readily available natural materials, such as naphthenic acid is accomplished. Amides and esters of individual and natural naphthenic acids Velebitare synthetised. The thesis also examined the biological activity ofthe synthesized products. The effect of natural petroleum acids Velebitand its derivatives are examined on the growth of five strains of Pseudomonas sp., and the impact of selected synthesized compounds on the proliferation of five human tumor cell lines in which a healthy human cell line is tused as the control.
Kristina, Krstic. „Uloga roditelja tokom prelaska deteta iz predškolske ustanove u školu“. Phd thesis, Univerzitet u Novom Sadu, Filozofski fakultet u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114098&source=NDLTD&language=en.
Der volle Inhalt der QuelleRad se bavi tematikom prelaska deteta
iz predškolske ustanove u školu kao periodom u
razvoju porodice koji dovodi do mnoštva
promena na različitim nivoima funkcionisanja i
od roditelja zahteva revidiranje dotadašnjih
roditeljskih uloga, kao i javljanje drugačije
vrste odgovornosti. U tom okviru, sublimacijom
relevantnih teorijskih i istraživačkih radova
sagledana je krucijalna uloga roditelja, odnosno
načina njihovog delovanja i zalaganja u skladu
sa razvojnim zadacima prepoznatljivim za
period tranzicije u školu. Istovremeno je
ukazano na potrebu građenja efikasnih
saradničkih odnosa na relaciji porodicapredškolska
ustanova-škola u cilju ostvarivanja
kontinuiteta u razvoju i adekvatne pripreme i
deteta i porodice za funkcionisanje u novom
obrazovnom okruženju. Stoga su u radu
razmatrane pretpostavke za umrežavanje
porodične, predškolske i školske sredine, pri
čemu poseban fokus stavljen na tranzicione
aktivnosti koje bi odgovorile na potrebe dece i
roditelja, kao i na osmišljavanje prakse koja će
podsticati aktivno uključivanje roditelja tokom
perioda prelaska deteta iz predškolske ustanove
u školu.
Cilj istraživanja usmeren je na
sagledavanje mišljenja roditelja o sopstvenoj
ulozi, kao i aktivnostima koje bi mogle
doprineti intenzivnijem roditeljskom
uključivanju tokom prelaska deteta iz
predškolske ustanove u školu. Uzorkom je
obuhvaćeno 759 roditelja čija su deca u
trenutku sprovođenja istraživanja pohađala
pripremni predškolski program. Primenjene su
metode teorijske analize i deskriptivnakorelaciona
istraživačka metoda, a podaci su
prikupljeni tehnikama anketiranja i skaliranja.
Pored Upitnika o opštim podacima ispitanika, u
istraživanju su korišćene četiri skale - Skala
roditeljske samoefikasnosti tokom tranzicije
deteta u školu, Skala percepcije roditeljske
uloge tokom tranzicionog perioda, Skala
poželjnih aktivnosti za uključivanje roditelja,
Skala efekata tranzicione prakse. Sastavni deo
Upitnika čine i pitanja otvorenog tipa koja su
poslužila za detaljniji uvid u razmišljanja
roditelja o mogućnostima unapređenja procesa
prelaska deteta iz predškolske ustanove u školu
i njihovom zalaganju tokom ovog tranzicionog
perioda.
Na osnovu dobijenih rezultata došlo se
do zaključka da roditelji pozitivno procenjuju
sopstvenu efikasnost u postupanju tokom
prelaska deteta iz predškolske ustanove i imaju
razvijenu svest o sopstvenoj ulozi tokom ovog
perioda, s tim da sebe kao efikasnije procenjuju
roditelji sa tranzicionim iskustvom i da su
majke svesnije svoje odgovornosti u pogledu
različitih zadataka. Takođe, roditelji su
mišljenja da svaka od predočenih poželjnih
aktivnosti tokom tranzicionog perioda može
doprineti višem nivou uključivanja roditelja, pri
čemu su značaj ovih aktivnosti u većoj meri
naglašavali roditelji nižeg obrazovanog nivoa. S
druge strane, iako je većina roditelja mišljenja
da će se deca uspešnije adaptirati na školsko
okruženje ukoliko tranziciona praksa
podrazumeva uključivanje roditelja, kao
poželjnije su procenili one aktivnosti koje su
bazirane na informisanju, za razliku od
aktivnosti koje podrazumevaju njihovo
intezivnije angažovanje. Većina roditelja je kao
najvažniji efekat tranzicione prakse koja
uključuje roditelje prepoznala uspešniju
adaptaciju deteta na školsko okruženje, pri
čemu su ustanovljene razlike s obzirom na tip
porodice i prethodno tranziciono iskustvo.
Utvrđeno je određene lične i porodične
karakteristike posreduju ili vrše moderatorski
efekat na odnose između merenih prediktorskih
i kriterijumskih varijabli.
Zaključuje se da su dobijeni nalazi
otvorili prostor za dalja proučavanja ove
problematike, pre svega u domenu sagledavanja
roditeljskih potreba i uvažavanja njihove
perspektive o važnim pitanjima koji se tiču
roditeljstva tokom tranzicionog procesa. Pored
toga, istraživački nalazi implikuju značajne
smernice za celokupnu vaspitno-obrzovnu
praksu u pogledu osnaživanja svih uključenih
tokom tranzicije u školu.
Marina, Carević. „Mešovite namene – ključni parametar planiranja savremenih gradova“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104858&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe dissertation examines characteristics of mixed uses, as an urban phenomenon and a planning concept. А special methodological procedure, including redefinition of mixed-use index, has been formulated for exploring the relations between the program structure of the city and a number of other parameters, which enabled making of well-grounded conclusions about contemporary cities, as complex systems. The particular area of study is the city of Novi Sad and five specific neighbourhoods, and on the basis of results of the work, there were given recommendations for improving of research and planning of mixed uses.
Milenko, Janković. „Fizička aktivnost predškolske dece“. Phd thesis, Univerzitet u Novom Sadu, Fakultet sporta i fizičkog vaspitanja u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=100388&source=NDLTD&language=en.
Der volle Inhalt der QuellePhysical activity can have a positive impact on the health status and psychosocial condition; therefore the main aim of this research was focused on the analysis of physical activities of preschool children. The theoretical part of the study includes all important matters essential for understanding the subject, while the empirical part is divided into four sections. The first section presents the results obtained from a questionnaire and a diary of activities completed by parents, and it analyzes the children's activity on weekdays and weekends. The second section relates to the extent of motor activity of children during their stay in the kindergarten. The statistical analysis in this section shows the scope of motor activity of boys and girls and what it depends on. According to the plan implemented in preschool institution, it is expected to have directed activities with motor content. This part is analyzed in the third and fourth section (duration, structure and content of activities as well as motorinvolvement of children in activities).
Bojana, Jokanović. „Model razvoja organizacione klime zasnovan na upravljanju znanjem“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=105034&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe dissertation explores how and to what extent the dimensions of theorganizational collaborative climate influences different knowledgemanagement activities, apropos the goal is to define the dimensions of theorganizational climate that are shown as adequate predictors of theknowledge management explanation. The model of organizational climatedevelopment based on knowledge management was proposed. In addition,the state of knowledge management in organizations in the South BackaDistrict has been identified.
Sofija, Forkapić. „Istraživanje gasovitih radioaktivnih produkata uranijuma i torijuma“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2014. http://www.cris.uns.ac.rs/record.jsf?recordId=87662&source=NDLTD&language=en.
Der volle Inhalt der QuelleIn this dissertation the author has been working on the development and application of low-level gamma spectrometry method to determine the content of uranium and other radionuclides gamma emitters in soil and sediment, as well as monitoring their distribution and correlation which is important to map the radioactivity of agricultural soil. In addition, author studies the equilibrium in the radioactive series of uranium and thorium, which gaseous products radon 222Rn and thoron 220Rn as inert gases leave the place of origin by diffusion and thus forming significant concentrations indoors, which is a significant problem for the low-level underground laboratories and population radiation risk. As part of this research an exact model for the determination of radon and thoron equilibrium was developed. The results will be used to test existing methods of measuring radon developed in the laboratory and the application of the measurement of radon activity concentration in urban areas. At the same time the study of these phenomena and decay corrections may have application in other nuclear analytical techniques in which the half-life of the target is comparable with the time of measurement.
Svetlana, Maksimović. „Komparativna analiza nastave engleskog kao stranog jezika u osnovnim školama u Japanu i Srbiji“. Phd thesis, Univerzitet u Novom Sadu, Filozofski fakultet u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=100975&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe goals of EFL teaching in Japan haverecently undergone drastic change, withglobalization and information technology’sarrival, one such change being the introductionof English at the elementary-school level.English as a foreign language (EFL) in Japan isbecoming a mandatory subject in compulsoryeducational system. According to Japaneseeducational policy, students are required to startlearning the English language in the fifth grade.In Serbia, the situation is different, meaning thatEFL has been introduced as a mandatory subjectfrom the first grade of elementary school.In this doctoral thesis we are primarilyinterested in discovering the methods andtechniques used in English language teaching inelementary schools in Japan, as well as inSerbia, and their adequacy in terms of achievingthe aims, and therefore fulfillment of thecurricula and syllabi regulated by Ministries ofeducation in both countries.The aim of this study is to define theactivities used in the classes, interactionbetween students and teachers, the use of themother tongue in class, as well ascommunication on the basis of contemporarymethodological aspirations in EFL Teaching.Based on the theoretical-methodologicalframework, this study attempts to define andcompare the ways teachers introduce classroomactivities in English that are communicative intheir given policy contexts in elementaryschools in Japan and Serbia. Using a qualitativedescriptive – triangulation method, relevant tothis study, data were gathered by classroom observations, interviews and also a survey forteachers in electronic form were conducted. Inaddition, comparative analysis of textbooksapproved by the Ministries and in use in bothcountries, was conducted.Observations of English lessons inprimary schools in Japan, as well as ananonymous survey of EFL teachers revealed thestudents’ motivation to learn English is at highlevel, but the methods and activities used inclasses with a high percentage of use of themother tongue (Japanese) lead to the lack of realEnglish communication in the classroom. Otherfindings in Serbia revealed the students’ highmotivation for learning English and teacherstending to reduce the use of the mother tonguein class, except when necessary, for presentingand explaining grammar, thereof, Englishclasses in Serbian schools tend to animatestudents, raising their motivation to the highestlevel.According to the data obtained,conclusions and suggestions were made in orderto help EFL teachers, and recommendations forfuture research and practice in both countrieswere also given.
Jovana, Šućur. „Biopesticidna aktivnost ekstrakata odabranih biljnih vrsta familije Lamiaceae“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=95670&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe chemical composition of essential oils and aqueous extracts of three types of self-seeding plants of the Lamiaceae family are examined. Apart from the composition, the effects of aqueous extracts on weed and vegetable plants, insects and microorganisms are examined. The effects of essential oils on insects are also examined. Insecticidal activity of examined plants is confirmed. It is also confirmed that the examined plants have no effect on the growth of useful microorganisms present in the soil.
Jovana, Ajduković. „Sinteza i biološka aktivnost 17-supstituisanih androstanskih derivata“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2013. http://dx.doi.org/10.2298/NS20131008AJDUKOVIC.
Der volle Inhalt der QuelleIn the first part of this dissertation, the synthesis of new 17α-picolyl and 17(E)-picolinylidene androstane derivatives with modifications in A and/or B rings, were presented. The second part of the work consisted on investigation of antiproliferative activity of selected newly synthesized compounds toward human carcinoma cell lines (MCF-7, MDA-MB-231, PC-3, HeLa, HT-29 and A549), as well as the healthy fetal lung fibroblasts (MRC-5).
Aleksandar, Oklješa. „Sinteza i biološka aktivnost novih steroidnih heterocikličnih jedinjenja“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=94966&source=NDLTD&language=en.
Der volle Inhalt der QuelleIn this PhD thesis 1,3-dipolar cycloadditions ofsteroidal azido-nitriles, nitrones and nitrile-oxide wereexamined. Various steroidal heterocyclic compounds inthe androstane and estrane series were synthesised. Thestructural characterisation of newly synthesisedcompounds was done. Biological activity of selectedcompounds was examined.
Dragoljub, Cvetković. „Kombuha od lekovitog bilja - biološka aktivnost i parametri fermentacije“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2008. https://www.cris.uns.ac.rs/record.jsf?recordId=71286&source=NDLTD&language=en.
Der volle Inhalt der QuelleKombucha is a traditional beverage obtained by fermenting sweetned black orgreen tea with tea fungus, which represents a symbiotic combination of acetic acidbacteria and autochthonous yeast species. In this study, the antimicrobial,antioxidative and antiproliferative activity of kombucha beverages (titratableacidity 3,5-4 g/L) obtain from black tea (Camellia sinensis L), echinacea tea(Echinacea purpurea L.) and rtanj tea (Satureja montana L.) were tested.Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus sp., Salmonellaenteritidis, Proteus mirabilis, Escherichia coli, Sarcina lutea, Saccharomycescerevisiae, Candida pseudotropicalis, Rhodotorula sp., Penicilliumaurantiogriseum, Aspergillus niger i Aspergillus flavus were used as testmicroorganisms for examination of antimicrobial activity. The antioxidant activityof differently prepared kombucha beverages was examined agains DPPH and OHradicals by ESR-spectrometry. Antiproliferative activity of black tea kombuchaand Satureja montana kokmbucka was measured by sulforhodamine Bcolorimetric assay on HeLa (cervix epitheloid carcinoma), HT-29 (colonadenocarcinoma), and MCF-7 (breast adenocarcinoma) cells line. Also, sameparametars of kombucha fermentation – optimal quantity of source of carbon andnitrogen in cultivation medium, geometric characteristics of reactors andinoculation by starter culture – were tested. Definition of critical parameters ofkombucha fermentation is important for derivation of mathematical model forscaling-up fermentation process.
Ljiljana, Janjušević. „Biološka aktivnost i hemijski sastav ekstrakata odabranih autohtonih makrogljiva“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104929&source=NDLTD&language=en.
Der volle Inhalt der QuelleAccording to the set aims of the presented PhD thesis, seven autochthonous fungal species from the region of Fruska Gora, Tara and Vršac Mountains were collected and determined: five lignicolous ‐ Bjerkandera adusta, Pleurocybella porrigens, Stereum hirsutum, Stereum subtomentosum and Trametes versicolor, and two terricolous ‐ Amanita strobiliformis and Hydnum repandum. Biological activity of these species (antiradical, antioxidant, antimicrobial, anti‐ acetylcholinesterase and cytotoxic) was determined in relation to the chemical composition of the extracts, aqueous (H2O), ethanolic (EtOH), methanolic (MeOH) and polysaccharide (PSH). Analysis of the chemical content of analyzed species included chemical characterization of PSH extracts – by FTIR analysis, determination of phenolic profile ‐ by HPMC/MS‐MS, content of organic acids ‐ by HPLC, fatty acid content ‐ by GC‐FID and content of biogenic elements ‐ by AAS. Spectrophotometric methods were applied for determination of the content of total proteins, polyphenols and flavonoids. According to the antiradical activity obtained towards OH•, О2•‐, OH•, Asc•, DPPH• and ABTS•+ extracts of lignicolous species were singled out: P. porrigens (MeOH extract), P. porrigens (H2O extract), T. versicolor (MeOH extract), S. hirsutum (H2O extract), S. subtomentosum (MeOH extract) and B. austa (H2O extract), respectively. The highest antioxidant activity obtained by FRAP and the polarographic HPMC method was exhibited for PSH and H2O extracts of the terricolous species A. strobiliformis. The intimicrobial activity of analyzed extracts was determined by examination of antibacterial, antifungal and antiviral potentials, whereby the species H. repandum was separated by exhibiting the best effect on Gram‐positive and Gram‐negative bacteria, and all the analyzed hytopathogenic isolates (Fusarium, Alternaria) and T. versicolor against analyzed bacteriophage. Anti‐cetylcholinesterase activity was determined by tests in solid and in liquid, while the best percent of AChE inhibition was showed by EtOH extracts of the species S. hirsutum, B. adusta, S. subtomentosum and T. versicolor.bThe cytotoxic activity of extracts was determined by MTT assay, and according to the best activity, the MeOH extract of P. porrigens, and H2O and EtOH extracts of B. adusta were distinguished particularly after 72 h. Based on the results obtained, favoring different species and their different extracts in the applied tests, it is clear that the biological activity and chemical composition depend on the origin, species and type of extract of the analyzed fungi. Based on the type of solvent or extract of the species that showed the best activity in relation to the above tests and on the basis of the obtained correlations as well as on the basis of the detected compounds, we assume that the phenol compounds and polysaccharides are responsible for the activities performed.Demonstrated bio‐potential of analyzed fungal species indicates their potential use as functional foods and nutraceutics, as well as in the biocontrol of phytopathogens.
Marija, Bjeljac. „Драмска и луткарска активност у наставној и ваннаставној пракси Српског језика и књижевности у основној школи“. Phd thesis, Univerzitet u Novom Sadu, Filozofski fakultet u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=100622&source=NDLTD&language=en.
Der volle Inhalt der QuelleDoktorska teza Dramska ilutkarska aktivnost u nastavnoj ivannastavnoj praksi Srpskog jezika iknjiževnosti u osnovnoj školi zamišljenaje kao književno-metodičko istraživanjekoje ima za cilj da istakne značaj drame ilutkarstva u nastavnoj i vannastavnojpraksi; da istakne značaj i uticaj drame ilutkarstva u redovnoj nastavi; da prikažerad dramske i lutkarske sekcije i njihovznačaj, kao i značaj koji drama i lutkarstvoimaju za učenike u vannastavnom procesu, asve to kroz principe diferencirane nastavei kroz primenu teorije sinhroniciteta.Rad je zasnovan na primerima iiskustvima iz prakse, a kroz primenu dijaloške metode (slobodan razgovor:diskusija, polemika), rada na tekstu,demonstrativne metode, praktičnog rada iradionica, kroz primenu igrovneaktivnosti, analitičko-interpretativnemetode došlo se do rezultata koji pokazujuda drama i lutkarstvo u nastavnom ivannastavnom procesu imaju značajan uticajna učenike i u obrazovnom i u vaspitnomsmislu. Primenom pomenutih metoda kao iprincipa diferencirane nastave časoviredovne nastave Srpskog jezika, kao i časovidramske i lutkarske sekcije učenicima suomogućili nov pristup dramskimknjiževnim delima kako na polju čitanja irazumevanja, tako i na polju doživljavanja ianalize.
PhD thesis Drama and puppet activity incurricular and extracurricular practice ofteaching The Serbian language and literature inprimary school is envisioned as literarymethodologicalresearch with the purpose ofemphasising the importance of drama andpuppetry in curricular and extracurricularpractice; emphasising the importance andinfluence of drama and puppetry in regularclasses; showing the work of drama and puppetryclub and its importance, as well as theimportance of drama and puppetry for students inextracurricular process, all through the principlesof differentiated teaching and through theapplication of the theory of synchronicity.This paper is based on the actualexamples and experiences, through theapplication of dialogue method (free conversation: discussion and polemics), textanalyses, demonstrative method, practical workand workshops, while applying acting games,analytical-interpretative method. This showedthat drama and puppetry in curricular andextracurricular process have a significantinfluence on students in both educational andupbringing sense. Applying the said methods, aswell as the principles of differentiated teaching,the classes of The Serbian language, as well asdrama and puppetry club classes gave students anentirely new approach to dramas in the field ofreading and understanding, as well as in the fieldof experience and analysis.
Saša, Spaić. „Sinteza i antiproliferativna aktivnost tiazolnih C-nukleozida i njihovih mimetika“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2011. https://www.cris.uns.ac.rs/record.jsf?recordId=77159&source=NDLTD&language=en.
Der volle Inhalt der QuelleMultiphase stereospecific synthesis of thiazole C-nucleosides, new analogues and mimics of tiazofurin, has been achives starting from D-glucose and D-xylose. We examined the in vitrocytotoxic activity of synthesized C-nucleosides by selected human tumor cell lines (K562, HL 60, Jurkat, Raji, PC 3, HT-29, MCF-7, MDA-MB-231, HeLa and Hs 294T) and the cells of normal fetal lung fibroblasts (MRC-5).
Bojana, Srećo Zelenović. „Dizajn, sinteza i antiproliferativna aktivnost prirodnih citotoksičnih laktona i analoga“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2013. https://www.cris.uns.ac.rs/record.jsf?recordId=83673&source=NDLTD&language=en.
Der volle Inhalt der QuelleMultiphase synthesis of natural cytotoxic lactones (+)-muricatacin (1),(–)-muricatacin (ent-1) and (+)-goniofufurone (2), as well as synthesis of theiranalogues (3a, 4, 5, 6, 7, 8, 9, ent-7and ent-9) was achived from D-xylose orD-glucose as starting compounds. In vitro cytotoxic activity of synthetized naturalproducts and analogues against selected human tumour cell lines (K562, HL-60,Jurkat, Raji, HT-29, MDA-MB 231 and HeLa) and against cells of natural foetal lung fibroblasts (MRC-5) was examined.
Daniela, Šojić. „Fotokatalitička aktivnost dopovanog titan(IV)-oksida u razgradnji nekih pesticida“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2009. https://www.cris.uns.ac.rs/record.jsf?recordId=16610&source=NDLTD&language=en.
Der volle Inhalt der QuelleIt is well known that RS-2-(4-chloro-o-tolyloxy)propionic acid (MCPP), (4-chloro-2- methyl-phenoxy)acetic acid (MCPA) and 3,6-dichloropyridine-2-carboxylic acid (clopyralid) are herbicides of wide activity spectrum. They are soluble in water, hardly biodegradable and, unfortunately, often present in drinking water.Heterogeneous photocatalysis by application of TiO2 and UV radiation proved to be very suitable for their removal from water. However, due toits large energy gap, i.e. 3.2 eV (anatase-form) and 3.0 eV (rutile-form), a very small fraction of sunlight in the near UV range (about 3–4%) is used during photocatalytic process, which is an indication of TiO2 inactivity in the presence of this light source. Some literature data report on the possibility of photodegradation of certain substrates by visible light in the presence of TiO2. MCPP served as substrate for testing TiO2 Degussa P25 photocatalytic activity in the presence of visible light. On the basis of reflection spectra it was established that MCPP adsorbed on TiO2 Degussa P25 was absorbing visible spectrum radiation (λ ≥400 nm). The existence of thus formed charge-transfer complex was confirmed with FTIR analysis. The efficiency of TiO2 Degussa P25 with application of visible light was compared to sunlight and UV radiation, as well to directphotolysis in the presence of these light sources. The rate of MCPP photocatalytic degradation by means of visible light is 0.86 μmol dm−3 min−1, which is about 4 times faster than direct photolysis. In addition, the optimal catalyst concentration of about 8 mg cm−3, much higher than using UV radiation, was established. The reason is, probably, a different mechanism of hotodegradation in the presence of visible and UV irradiation. Namely, the presence of 2-methyl-2-propanol (well-known •OH radical scavenger) has practicallyno effect on the rate of MCPP photocatalytic degradation using visible light, which points that this degradation mechanism does not involve •OH radicals, in contrast to that established for UV radiation.Since the catalyst TiO2 Degussa P25 with application of visible light was not very efficient in degradation of all three herbicidesand in view that nowadays is very popular doping process of TiO2 with different types of metals (alkali, alkaline-earth, transition, etc.) and non-metals (halogen, chalcogen, etc.), in the scope of this Ph.D. thesis activities of N-TiO2 (synthesized by wet and dry procedure) and TiO2 (rutile) doped with various amounts of Fe3+ (0.13–1.48 at.%) in degradation processes of herbicides MCPP and MCPA using visible light were studied. In addition, the efficiency of TiO2 (anatase) doped with various amounts of Fe3+ (0.71–1.80 at.%) was also tested for MCPP degradation. When comparing N-TiO2 (synthesized by wet procedure) and N-TiO2 (dry procedure), it was observed that in the latter case the catalyst efficiency was about two times higher. In this case for MCPP was also observed somewhat higher photocatalytic activity of N-TiO2 (synthesized by dry procedure) in comparison with TiO2. When activities of all three catalysts towards MCPA are compared, the results are very alike. In addition, higher efficiency of N-TiO2 (wet procedure) comparing to TiO2 Degussa P25 (about 1.5 times) and about 5 times in comparison to direct photolysis were recorded, while N-TiO2 (dry procedure) was about 3 times more efficient than TiO2 Degussa P25 and about 10 times in comparison with direct photolysis. The rate of solar degradation is about 100 times lower than by application of UV and visible radiation, as a consequence of various intensities of the mentioned light sources and different conditions of photodegradation. An optimal concentration of N-TiO2 (wet procedure) of 4 mg cm−3 was established.During degradation of MCPP and MCPA it was observed that the rate is higher if TiO2 (rutile) was applied comparing to Fe-TiO2 and with increasing amount of Fe3+ photocatalytic activity mostly decreases. When TiO2 (anatase) doped with various amounts of Fe3+ (0.71 to 1.80 at.%) was applied for MCPP degradation, the process was much slower than with undoped catalyst.Since we have not found relevant literature data on kinetics and mechanism of photocatalytic degradation of clopyralid, its stability in different experimental conditions was tested. In investigating of influences of pH (1.0–9.0) both in presence and in absence of daylight, in no cases decomposition was observed during seven months experiments. Also, the kinetics of photocatalytic degradation of clopyralid using UV and visible irradiation in the presence of TiO2 Degussa P25 and in direct photolysis by application of both irradiation sources was studied. It was found that the rate of photocatalytic decomposition using UV radiation was 5 times higher comparing to direct photolysis. For clopyralid photocatalytic monitoring a pH value of 3.2 was chosen. In addition, in the investigated concentration range (0.5–3.0 mmol dm−3) the photocatalytic degradation kinetics of clopyralid in the first stage of the reaction follows approximately a pseudo-first kinetic order. In investigation of influence of catalyst concentration (0.5–8 mg cm−3) on the rate of clopyralid degradation the highest reaction rate was observed at 4 mg cm−3 of catalyst concentration The apparent activation energy of the reaction being 7.74 kJ mol−1. The absence of molecular oxygen resulted in a significant decrease (about 2 times) in the rate of clopyralid photodegradation. The effect of the presence of (NH4)2S2O8, H2O2 and KBrO3, acting as electron acceptors along with molecular oxygen affects clopyralid photocatalytic degradation considerably and indifferent ways. By studying the effect of ethanol as a hydroxyl radical scavenger it was shown that the heterogeneous catalysis takes place mainly via •OH radicals.LC−MS/MS (ESI+) monitoring of the process showed that several pyridine-containing intermediates are formed: 3,6-dichloropyridin-2-ol, 3,6-dichloro hydroxypyridine-2-carboxylic acid and 3,3',6,6'-tetrachloro-2,4'-bipyridine-2-carboxylic acid. Based on the identified intermediates and overall kinetic results, a probable photocatalytic degradation mechanism was proposed. Finally, in the case of clopyralid it was established that practically no degradation occurs in the presence of TiO2 (anatase) and N-TiO2 (dry procedure) with visible light and also with TiO2 Degussa P25. Besides of that, by using TiO2 (rutile) and Fe-TiO2 as photocatalysts it was noted that increasing the concentration of Fe3+ from 0.13 to 1.27 at.% comes to increasing photodegradation rate of clopyralid. Results indicate that differences in molecular structure of chosen compound, influence obtained photocatalytic activity to a great extent.
Milica, Vinčić. „Antioksidativna, antiproliferativna i antimikrobna aktivnost odabranih ekstrakata tropova bobičastog voća“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104808&source=NDLTD&language=en.
Der volle Inhalt der QuelleThis work examined the chemical composition, the antioxidant,antihyperglycaemic, antiproliferative and antimicrobialactivity of the freeze-dried raspberry (Rubus idaeus L.)varieties Meeker (ETMM) and Willamette (ETMW), blackberry(Rubus fruticosus L.) varieties (ETKČ) and Thornfree(ETKT), and wild blueberry (Vaccinium myrtillus L.) (ETB)pomaces methanol extracts. The content of total polyphenols(TPh), total flavonoids (TF) and total anthocyanins (TAc) inthe pomace extracts were determined spectrophotometrically.Identification and quantification of the phenolic compounds(phenol acids, flavonols and cyanidins) and ascorbic acid inthe pomace extracts was performed by HPLC analysis. Theantioxidant activities of the extracts was determined spectrophotometricallyusing DPPH and ABTS+ free radicals andreducing ability assay. ESR spectroscopy is used for determinationof pomace extracts’ influence on reactive hydroxyland superoxide anion radicals. Antihyperglycaemic activity ofthe pomace extracts was determined using α-glucosidase inhibitionassay. The antiproliferative activity of the pomace extractswas tested in vitro, testing their influence on the growthof four histologically different human tumor cells: HeLa(cervix epithelioid carcinoma), MCF7 (breast adenocarcinoma),HT-29 (colon adenocarcinoma) and MRC-5(human fetallung fibroblasts). Antimicrobial activity of berry pomace extracts was tested on selected strains of Gram-positive andGram-negative bacteria, yeasts and molds with the disc diffusionmethod and the method of “wells”. The possibility offreeze dried berry pomace extracts application as a fruit functionaladditive was investigated as well. Laboratory producedenriched juice was tested in terms of TPH, TF and TAc content,reducing ability and DPPH scavenging ability as well.The results of testing the chemical composition, the antioxidative,antihyperglycaemic, antiproliferative and antimicrobialactivities of ETMM, ETMW, ETKČ, ETKT and ETB, indicatethat all investigated pomace extracts are a potential source ofnatural bioactive compounds, and that the antioxidant activityenriched juice indicates the possibility of using these extracts,as a functional additive in the production of various high-valuefood products.
Ljubica, Grbović. „Izolovanje, strukturna karakterizacija i biološka aktivnost naftnih kiselina iz Vojvođanske nafte“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2009. http://dx.doi.org/10.2298/NS20091204GRBOVIC.
Der volle Inhalt der QuelleGroup-structural analysis of naphthenic acids isolated from middle commercial fractions of Vojvodina oil „Velebit” was performed with the analysis of IR-,1H- and 13C NMR- and ESI-MS low resolution spectrums. Six classes of carboxylic acids of the general molecular formula CnH2n-ZO2 were determined. These are carboxylic acids with mass range of 240-466 with 15-31 C atoms in molecule which are grouped in five cycloalkyl Z-series: monocyclic- (CnH2n-2O2, 14.72%), bicyclic- (CnH2n-4O2, 34.63%), tricyclic- (CnH2n-6O2, 25.03%), tetracyclic- (CnH2n-8O2, 10.04%), pentacyclic class of carboxylic acids (CnH2n-10O2, 4.99%) and one alyphatic class of acids with open chain alkyl groups (CnH2nO2, 10.57%).By fractioning on the basis of different levels of acidity and their solubility in water with pH values ranging from pH 2-10 nine subfractions of acids were obtained. By extraction with ether in water undissolved acids in the range of one pH unit the following distribution of mass was performed: 9.57% (pH 10), 12.69% (pH 9), 5.91% (pH 8), 4.85% (pH 7), 2.44% (pH 6), 11.71% (pH 5), 23.94% (pH 4), 16.76% (pH 3) and 10.12% (pH 2). By fractioning acids on the basis of their acidity about 50% of acid mass was extracted at pH 2-4, i.e., in the group of stronger acids. Low resolution mass spectrometry ESI-MS shows that at pH 4 acids with more rings in the alkyl section were concentrated in the mixture with maximum at tricyclic acids (36.50%), while individually tetracyclic acid structures C20H32O2 (4.43%) and C21H34O2 (4.56%) were most prominent. At pH 8 bicyclic- and tricyclic structures are represented together by 65.02% with acids with 20-26 C atoms in molecule being represented the most, and C22H38O2 (5.26%) bicyclic- and C24H42O2(7.01%) tricyclic structures stand out, while with tertacyclic acid structures C24H40O2 (4.77%) stands out. At pH 10 most represented isolated acids are acyclic, i.e., fatty acids which are represented by 25.28%, with the most dominant C21H42O2 structures (4.83%), while the other classes of acids are well balanced in their mass share in relation to the composition of the overall initial acid mixture.The second part of this work deals with derivatization of the isolated natural naphthenic acids. Functional oxygen methyl-, ethyl-, n-butyl-, tert-butyl and benzyl-derivatives of naphthenic acids as well as functional nitrogen derivatives: amides and anilides of naphthenic acids were synthesized. The syntheses of the above mentioned esters were performed by conventional methods and by a modified method of esterification in acid-catalyzed conditions using microwaves as a co-catalyst with the aim of shortening the reaction time and improving the ecological synthetic conditions. By modification of methyl naphthenates synthesis using MT-heating the time period for synthesis is reduced 48 times and the yield does not significantly change even after the reaction parameters (time, MT power) have been altered. Using structural analysis of ESI-MS spectrum of initial carboxylic acids and the methyl naphthenates obtained through methylation of naphthenic acids it was establishedthat the class ratio shows great compatibility. The esters yield in this synthesis is 95.47%. The esterification of naphthenic acids with ethyl alcohol done under the conditions of acid catalysis with conventional heating (91.76%), and with the modified method MT-heating (150 W) the reaction time is reduced 96 times (92.19%). The esterification of naphthenic acids with n-butyl alcohol was performed using sulphuric acid as a catalyst with conventional heating (94.24%), and under MT-heating conditions (150 W) reaction time was 72 times shorter (61.15%). The synthesis of tert-butyl naphthenates was performed by conversion of naphthenic acids into chlorides, followed by the reaction with tert-butyl alcohol which resulted in tert-butyl naphthenates (80.17%). By the modified method of conventional reaction of esterification of naphthenic acids using tert-butyl alcohol catalysed with sulphuric acid in MT-heating conditions (150 W) the yield was 85.49% and reaction time was 5 minutes. The synthesis of benzyl naphthenates was performed by conversion of naphthenic acids into chlorides, followed by a reaction with benzyl alcohol which produces benzyl naphthenates (84.43%), whereas the modified method of conventional acid-catalysed esterification of naphthenic acids using benzyl alcohol under MT-heating (150 W) conditions the yield was 85.49% with the reaction time of 5 minutes. The synthesis of naphthenic acid amides was done from chlorides by reaction with ammonia. The yield of pure amides was 65.74%, and the reaction of amidation with ammonia lasted for 15 minutes. The structural analysis of ESI-MS spectrum of naphthenic acid amides determined the group-structural composition of amides. With the structures of amides of naphthenic acids bicyclic- and tricyclic structures are also dominant, as in the mixture of free acids. The synthesis of naphthenic acid anilides were performed from chloride by reacting with aniline. The yield of pure anilides was 96.48%, and the reaction of amidatation lasted for 30 minutes. The structural analysis of ESI-MS spectrum of naphthenic acid anilides determined the group-structural composition of anilide products. With the structures of anilides of naphthenic acids bicyclic- and tricyclic structures are also dominant, as in the mixture of free acids.The third part of this work tests the biological activity of naphthenic acids of auxine and gibberellinic type, their influence on the rooting of cuttings, lateral branches and microshoots of plants, on the activity of plant hormones as well as on the metal ions uptake by plants. The activity of naphthenic acids was determined using three in vitro biological tests. „Koleoptil test”, was done on two substrates, namely the seed of winter wheat of the Partizankasort and the spring wheat of the Venerasort. The referential activity in the test was performed with α-naphthylacetic- and 3-indolacetic acid. Both tests showed approximately the same ratio of activity of naphthenic acid solutions and standard plant hormones. „Germination Inhibition Test” of the seed was performed using Brasscia nigraseed. The greatest influence of naphthenic acids to germination inhibition was achieved in the acid concentration ranging from 10-7-10-8 mol/L (0.05-0.01 mg/L). The tests for six narrow fractions obtained from the overall mixture of acids through fractioning on the basis of different solubility at different pH values show the same activity as 3-indolacetic acid (0.5 mg/L), with the fraction isolated from the aqueous solution at pH 7 also active but in comparison to 3-indolacetic acid this activity was 10 times lower. Hormone activity of gibberellinic type of the potassium salts of naphthenic acids was determined using “Endosperm Test” where amylase activity was determined by spectrophotometric measuring of the increase of the concentration of reducing sugars in endosperm in the treated barley seed which was then compared to the activity of the gibberellic acid solution (GA3). The results of these tests indicate that the activity of aqueous solutions of narrow fractions of naphthenic acids in the concentration of 1.0 mg/L (3.5 x 10-6 mol/L)the fraction isolated at pH 8 has the activity which is approximately within the range of activities of gibberellin of the concentration of 10-2-10-3 mg/L. Sodium salts of naphthenic acids in concentrations of 10-6 do 10-8 mol/L stimulated formation of adventitious roots in sunflower cuttings even by a factor of 40 compared with control, the effect being also observed lateral branches of interspecies sunflower hybrids. The obtained results suggest the possibility of using naphthenic acids as a means for rooting of plant cuttings.Rooting of hardwood plants was investigated on the cuttings of white poplar (Populus alba) and black poplar (Populus deltoides). The distinct inhibitory effect on the root and shoot growth in water culture was detected in the concentration of naphtenic acids 10-4 mol/L, but 24-hour treatment raised the number roots on undermost 5 cm of the cutting, as well as the total number of roots, comparing to the control.In the test of rooting microshoots ofchrysanthemum the highest number of roots was achieved after the treatment with solution containing 10 µmol/L of total napthenates, as well as after the treatment with fraction of naphthenic acids which was isolated at pH 7 in concentration of 50 µmol/L. Both results are on the level of activity of 3-ndolbutyric acid in concentration of 10 µmol/L which suggests that in this case ractionation is not necessary.The effects of sodium naphthenates on rooting were investigated by measuring the level of total peroxidases and amylase, along with the contents of reducing sugars and total proteins in basal parts of cuttings of black locust (Rozaszin-AC). After 1; 3 and 6 days cuttings were taken for biochemical analysis. In all cases, the activities of IAA-oxidase and amylase increased to the third day and showed a decrease afterwards. The effect was more pronounced after the three-hour treatment with sodium naphthenates, compared to the six-hour treatment and control. The content of soluble proteins increased one dayafter the treatment and decreased to the third and again increased to the sixth day, an exception being the six-hour treatment with sodium naphthenate, when the effect was completely opposite.The test of naphthenic acids influence on the level of cadmium in plants showed physiological activity of naphthenic acids on the decrease of the level of heavy metals, in this case cadmium, in the plant. The effect of low concentrations (10-7 mol/L) of sodium naphthenate on total content of Cd in the intercellular space and inside cells, as well as on some physiological and biochemical parameters of young soybean plants grown in the presence of 1 mmol/L solution of cadmium chloride was investigated. Presence of naphthenate reduced in average by 40 % content of total and intracellular Cd in root, stem and leaves and alleviated the harmful effect of Cd on activity of nitrate reductase and content of photosynthetic pigments.Treatment of soybean plants with low concentrations of sodium naphthenate influenced the accumulation ofsome essential elements by the young plants. The presence of naphthenates (10-7 mol/L) significantly increased content of Mn, Fe, Zn and Ni in root, but in stem and leaves increased only contents of Fe and Mn. Inroot, the content of Mn increased four times while contents of Fe, Zn and Ni increased by 17%, 60% and 68% respectively compared to the control.Investigations on celery and carrot confirmed that the influence of naphthenates on mineral nutrition depends on the applied element and that the way of uptake of certain ions is different, which results in either increase or decrease of the contents of some ions in certain parts of plants. Young plants of celery and carrot, were grown in the nutrient medium and treated with sodium salts of naphthenic acids (10-7 mol/L) over the leaves or with its presence in the nutrient medium. Only the treatment based on the presence of naphthenates in the nutrient medium resulted in the decrease of the fresh mass of root and aboveground part by about 20% for both plants. Both treatments had influence on the content of Fe, Cu, Mn, Mg and Ca in the plants of celery and Fe, Mn, Zn and Na in the plants of carrots. In the plants of celery the content of the mentioned nutrients was decreased, while in the root of plants of carrot the content was increased, Fe by 45%, Mn by 70% and Zn by 37%. With these plants the presence of naphthenates in the nutrient medium caused the reducing roots and aboveground parts, which is completely opposite from the results obtained with soybean plants. The treatment by leaves significantly increased the mass of aboveground part only with celery.
Kristina, Pogrmić. „Mehanizmi delovanja atrazina na steroidogenu aktivnost Leydig-ovih ćelija peripubertalnih pacova“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2010. http://dx.doi.org/10.2298/NS20100408POGRMIC.
Der volle Inhalt der QuelleIn the present study, we investigated the effects of oral dosing of atrazine (2-chloro-4- ethylamino-6-isopropylamino-s-triazine) to peripubertal male rats (50 mg/kg and 200 mg/kg body weight daily from postnatal day 23 to 50) on ex vivo Leydig cell steroidogenesis. Leydig cells from treated rats were characterised by significant decline in mRNA transcripts of several genes responsible for steroidogenesis: luteinizing hormone receptor (LHR), scavenger receptor-B1, steroidogenic acute regulatory protein (StAR), translocator protein, steroidogenic factor-1 (SF-1), phosphodiesterase 4B, 3β−hydroxysteroid dehydrogenase (ΗSD), CYP17A1 and 17βHSD. In the presence of human chorion gonadotropin, the dose-dependent decrease in extra cellular cAMP level and accordingly strong inhibition of androgenesis were obtained. The transcription of LHR gene in Leydig cells of atrazine-treated rats was down-regulated in a dose-dependent manner, which could be the reason for reduction in cAMP level and expression of cAMPdependent genes. The results also indicated inhibition of substrate-stimulated androgen production in parallel with reduced expression of steroidogenih enzymes CYP17A1 and 17βHSD. In the second part of this study we examined direct 24 h in vitro effect of different doses of atrazine (1 nM, 1 μM, 20 μM, 50 μM) on expression and activity of steroidogenic enzymes in purified Leydig cells obtained from peripubertal rats. Obtained results indicated that 24 h-incubation of peripubertal Leydig cells in the presence of atrazine increased steroidogenic capacity of that cells. Increased basal and hCGstimulated testosterone production were accompanied by increasing levels of cAMP in the medium of treated cells. Also, in comparison to controls, gene expression revealed increased expression of SF-1, StAR, CYP17A1 and 17β-HSD. When Leydig cells were challenged with progesterone and Δ4–androstenedione, testosterone production was increased in atrazine chalenged Leydig cells. To address these two opposite effects of atrazine we performed 24 h in vivo experiment in which peripubertal male rats (on postnatal day 50) were exposed to single atrazine treatment (50 mg/kg- and 200 mg/kgbody weight by gavage), and 24 h later, Leydig cells were isolated and testosterone levels in medium determined in basal and in hCG-stimulated conditions after 2 h-incubation period. Obtained results indicated that single in vivo exposure to atrazine was also accompanied 24 h later by up-regulation of Leydig cell androgenesis and increased cAMP level. According to the results obtained in this study, it seems that modulation of cAMP levels appear as a link that connects all three experimental approaches. However, the question of how atrazine affects the modulation of cAMP levels remains open, and present a motive for further research. In concluson, obtained results indicated that 24 h treatment with atrazine caused an increase, while prolonged treatment strongly reduce steroidogenic capacity of peripubertal Leydig cells.
Jovana, Francuz. „Nove izostere i bioizostere prirodnih stiril-laktona: dizajn, sinteza i antiproliferativna aktivnost“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=93661&source=NDLTD&language=en.
Der volle Inhalt der QuelleMultistep synthesis of a number of natural styryl lactones goniofufurone and 7-epi-goniofufurone analogues was achieved starting f rom D-glucose. In vitro cytotoxicity of newly synthetized analogues against nine human tumour cell lines and against a single normal cell line was evaluated. Structure-activity relationships were established for both natural products and analogues. Some additional biological tests related to the cell mechanisms underlying the cytotoxicity of the mentioned styryl lactones and analogues, were also carried out.
Vesna, Tumbas. „Antiradikalska i antiproliferativna aktivnost ekstrakata odabranih biljaka iz familija rosaceae i ericaceae“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2010. https://www.cris.uns.ac.rs/record.jsf?recordId=82632&source=NDLTD&language=en.
Der volle Inhalt der QuelleAcetone extracts of berries form Ericaceae (bilberry, Vacciniummyrtillus L., and cranberry, Vaccinium macrocarponL.) and Rosaceae (rose hip, Rosa canina L., and hawthorn,Crataegus oxyacantha L.) families were purified and fractionatedusing solid phase extraction (SPE). Contents of totalpolyphenols, flavonoids and anthocyanins in purified extractswere determined by spectrophotometric methods.HPLC analysis were used for quantitative and qualitativecharacterization of investigated berry extracts fractions. ESRspectroscopy was used for investigation of antiradical activityof berry extracts fractions on stable DPPH● andreactive superoxide anion and hydroxyl radicals. Thepresence of antioxidant free radicals formed during reactionof investigated berry extracts fractions with superoxideanion radicals was also investigated by ESR. Antiprolixferativeactivity of investigated berry extracts fractions wasdetermined in vitro, testing their influence on the growth ofthree histologically different human cell lines: HeLa (cervixepithelioid carcinoma), HT-29 (colon adenocarcinoma) iMCF-7 (breast adenocarcinoma).
Dajana, Hrnjez. „Biološka aktivnost fermentisanih mlečnih napitaka dobijenih primenom kombuhe i konvencionalnih starter kultura“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95269&source=NDLTD&language=en.
Der volle Inhalt der QuelleNowadays, production of fermented dairy products with elevated benefits on human health has become one of the major focuse in dairy industry. The aim of the PhD thesis is to examine the biological activity of fermented milk products obtained using non-conventional starter culture kombucha (cultivated on black tea with 10% of sucrose) and comparision with products obtained by conventional starter cultures, probiotic/yoghurt during storage. Milk with 2.8% of milk fat was used for the samples production at temperature of 42 °C.The changes of components content during the milk fermentation by kombucha and conventional starter cultures were monitored at the following pH values: 6.4; 6.0; 5.5; 5.0 and 4.6., by determining the degree of proteolysis, lactose, D-galactose, D-glucose and D-fructose, fatty acids. The antihypertensive activity (ACE inhibitory activity), antioxidant activity (ABTS and DPPH tests) and the degree of proteolysis, sensory and rheological characteristics of all three types of fermented milk products were observed during 21 days of storage. Moreover, the chemical qualities of samples were monitored analyzing the contents of sugars, fatty acids, minerals (calcium, sodium and potassium), vitamin C and biogenic amines. There were differences in protein fractions (analyzed by capillary electrophoresis) of products obtained by using different starter cultures during the milk fermentation. Different starter cultures affect different ACE inhibitory activity during the storage, which implies different proteolytic activity of used starter cultures. It has been found that the ACE inhibitory activity was increased during the storage; wherein the samples obtained using kombucha starter culture have the highest ACE inhibitory activity at the 14th day of storage, 79,4%, while in yogurt and probiotic yoghurt it was 63.4 and 64.6% respectively. Also, the degree of proteolysis during the storage was increased in all samples with significant mutual variations. In all products, higher ABTS than 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity was determined, while both activities slightly decreased during the storage. The antioxidant activity of all samples decreases during storage. After 21 days of storage, the highest antioxidant potential, determined by the ABTS. + method had a yoghurt samples (TEAC value of 8.922 mmolmg-1). In terms of the fatty acids composition during 14 days of storage in all type of fermented dairy products relative content of SFA (saturated fatty acids - SFA) increased, while relative contents of MUFA (monounsaturated fatty acids) and PUFA (polyunsaturated fatty acids) decreased during that period of storage. After 21 days of storage the content of SFA; MUFA and PUFA in kombucha fermented milk product was 65.94; 30.73 and 3.33% respectively. In yogurt sample their content was 66.02, 30.77 and 3.21%, while in probiotic 66.04; 30.66 and 3.30% respectively. In all fermented milk products, long chain fatty acids were dominant with a total share of about 45% in all varieties of fermented dairy products. The highest content of vitamin C after production and 14 days of storage was in samples obtained by kombucha starter culture (0.5457 ± 0.017 mg100g-1). Samples obtained by conventional starter showed better overall rheological properties at the tested conditions for 21 days of storage. Kombucha fermented milk product had a characteristic, distinctive mild sour, refreshing taste and conspicuous aroma.The obtained results of biological activity and the quality of kombucha fermented milk products during storage in comparison to the same characteristics of the products obtained using conventional starter culture, could explain that kombucha is convenient starter for milk fermentation with the aim of obtaining new functional fermented milk products with pronounced bioactive characteristics and distinctive sensory and rheology properties.
P, Savić Marina. „Sinteza i antiproliferativna aktivnost novih D-homo i D-seko derivata androstana“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2013. http://dx.doi.org/10.2298/NS20130319SAVIC.
Der volle Inhalt der QuelleIn first part of this work was achieved synthesis of some new androstane derivatives with D-lactone function and new D-seco derivatives with modification in A and/or B rings. In the second part the antiproliferative activity of selected newly synthesized compounds by human carcinoma cell lines (MCF-7, MDA-MB-231, PC-3, HeLa, HT-29, K562) and the healthy cells of fetal lung fibroblasts (MRC-5 ) was examined.
Marina, Francišković. „Fitohemijska karakterizacija i biološka aktivnost odabranih vrsta tribusa Urticeae i Parietarieae (Urticaceae Juss.)“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=94950&source=NDLTD&language=en.
Der volle Inhalt der QuelleWithin this doctoral thesis the chemical composition and biological activity of methanol and aqueous extracts of the selected plant species belonging to the Urticeae and Parietarieae tribe, more specifically to the Urtica and Parietaria genuses was evaluated (Urtica: U. dioica subsp. dioica var. pubescens, U. dioica subsp. dioica var. dioica and U. kioviensis; Parietaria: P. officinalis, P. lusitanica subsp. lusitanica, P. judaica subsp. judaica and P. serbica). The principal aim was to determine the content of biologically active compounds in this, poorlyexamined species of the Urticaceae family, and determine their potential as additional remedy and dietary supplements.Qualitative analysis of methanol extracts was performed by LC-DAD-MS i LC-MS/MS analysis, and LC-MS/MS for quantitative analysis of selected phenolic compounds. Total phenolics and flavonoids were determined spectrophotometrically. In order to assess the biological potential, the antioxidant and anti-inflammatory activities of the extracts were studied as well as their ability to inhibit acetylcholinesterase. The immuno-modulatory effects of the selected methanol extract on the immune response and proliferation of intestinal epithelial cells (IEC18 and Caco2)was determined.The obtained results suggest that the examined species of the Urticeae and Parietarieae tribe (genuses Urtica and Parietaria) are abundant with the biologically active compounds that express a broad spectrum of biological activities. As a potential chemotaxonomic markers stand out the following compounds: 5-O-caffeoilquinic acid (highly abundant in the herb extracts of the Urtica spp.) and epicatechin (highly abundant in the root extracts of the Parietaria spp.). U.kioviensis herb extracts differs from the rest by high content of vitexin and total lack of rutin. The best antioxidant potential have exhibited the root extracts of the Parietaria species. The strongest anti-inflammatory potential had the root extract of the P. officinalis, followed by root extracts of the Urtica spp. Excellent anti-inflammatory activity have exhibited the aqueous extracts of U. dioica herbs – stinging nettle teas. All tested methanol extracts have inhibited enzyme acetylcholinesterase, the best inhibitors being root extracts of U. kioviensis and Parietaria species. Root extracts of P. officinalis and P. judaica have increased the basal and LPS-stimulated secretion of rat MCP1 and GROα, while U. dioica extracts increased the basal but decreased the LPS-stimulated secretion. The examined extracts interact with the MyD88 (but not the TLR4) and NF-κB signaling pathway. The root extract of P. officinalis increase LPS-stimulated expression of COX-2 in IEC18 cells, while the root extract of U. dioica decreases it.The herb and root extract of P. officinalis exhibit the wound healing effect. Investigated extracts do not significantly alter the secretion of hMCP1 and IL-8 in Caco2 cells and exhibit no significant effect to their proliferation.
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Filip, Šibul. „Isolation, chemical characterisation and biological activity ofacylphloroglucinols from petroleum ether extract of Hypericum barbatumJacq. 1775“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=105517&source=NDLTD&language=en.
Der volle Inhalt der QuelleU okviru ove doktorske disertacije izolovano je osamnaest novih jedinjenja, policikličnih poliprenilovanih acilfloroglucinola, iz petroletarskog ekstrakta biljke Hypericum barbatum. Imena jedinjenja su hiperibarbini A–R. Za hiperibarbine A–D, ispitana je citotoksičnost prema kancerogenim ćelijama i antibakterijska aktivnost. Sva četiri jedinjenja su ispoljila srednju aktivnost prema tumorskim ćelijama in vitro. Iako neaktivni prema Gram negativnim bakterijama, ispitana jedinjenja su ispoljila izuzetnu bakteriostatsku aktivnost prema sojevima Gram pozitivnih bakterija. Hiperibarbini C, E, N i K su, zbog posedovanja endoperoksidnog prstena u svojoj strukturi, testirana na antiprotozoalnu aktivnost, ali su pokazali srednju aktivnost prema ispitanim sojevima parazita. Svi ciljevi postavljeni na početku izrade ove doktorske disertacije su do kraja ispunjeni, sa izolacijom novih, prvi put opisanih i u potpunosti hemijski okarakterisanih jedinjenja.
Sonja, Šušnjević. „Kvalitet života odraslih osoba sa motornim invaliditetom na teritoriji Vojvodine“. Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=94840&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe World Health Organization defines quality of life (QoL) as “an individual'sperception of their position in life in the context of the culture and value systems where they live and in relation to their goals, expectations, standards and concerns. It is a broad concept affected in a complex way by a person's physical health, psychological state, personal beliefs, social relationships and their relationship to salient features of their environment.”Over a billion people are estimated to live with some form of disability. This corresponds to about 15% of the world's population. The presence of any sort of physical disability in person can significantly influence their physical,mental and social development. The assessment of the effects of a disability on every day, life reflects on the functioning and wealth of a person on daily basis and in various segments of life, that actually represents the assessment of their quality of life. The research represents a cross-sectional study of the sample of 227 adults with motoric disability in Vojvodina, who are registered in associations of people with disability. Especially created questionnaire was used to assess quality of life. The aim of this study was to investigate the relationship between physical (PF), emotional (EF) and social functioning (SF) domain of QoL and education level, employment and having life partner of disabled persons.The data collected during the survey were checked for validity, then coded and entered into a specially created database. Тhe questions were selected, four scales / domains (physical, emotional, social functioning and self assessment of health) were formed based on the correlation matrices, intercorrelation cofficient (ICC) and Crombach alpha values. Mean value, median, standard deviation, minimum and maximum values and 95% of confidence interval wаs calculated for all domain of QoL. The values obtained in the field of physical, emotional and social functioning were compared as per gender and marital status of the participants, using t-test, Mann-Whitney test, ANOVA method and Kruskal Wallis test were used to compare the mean values in respect to level of education and employment status of the respondents. For all the tests, the levels of statistical significance (p) were provided. The study involved 227 adults with motoric disability in Vojvodina, 120 men (52.9%) and 107 women (47.1%). Average age of the participants was 47 years of age. The cause of disability in the largest number of the interviewees were the injury (33.0%), then neurological conditions (26.0%), inborn condition (20.7%), serious rheumatic disease (13.7%), cerebrovascular insult (2.6%) and other (4%). As for the orthopedic tools, wheelchairs are used by 30.4% participants, stick 37.0%, walker is used by 3.1% and the orthoses for elevating feet 3.5%, whereas the rest of the interviewees state other (different orthopedic tools such as crutches, anti decubitus mattresses etc). Psychometric analysis showed that in order to define the domain on physical functioning from the questionnaire applied it was possible to include the 5 questions, for emotional functioning domain 10 questions and for domain on social functioning 3 questions. The sum of all selected questions for every domain forms the scale in the range from 0 to 100. The set of five questions stated for the scale of physical functioning indicate the capacity of physical functioning. The average value of PF domain for all the interviewees is 85.0 (SD=18.9) with 95% CI in the range of 82. 6 to 87.5. The difference in regard to employment status (p=0.067) is statistically significant but there is not satisticlly significant difference in regard level of education and marital status. The set of ten questions stated for the scale of emotional functioning. The average value of EF domain for all the interviewees is 62.5 (SD=20.0) with 95% CI in the range of 59.9 to 65.1. The difference in regard to level of education (p=0.048) is statistically significant but there is not satisticlly significant difference in regard to employment status and marital status. The set of three questions stated for the scale of social functioning indicate the capacity of social interaction. The average value of SF domain for all the interviewees is 72.0 (SD=27.6) with 95% CI in the range of 68.4 to 75.6. The difference in regard to the level of education is statistically significant (p< 0.001) but there is not satisticlly significant difference in regard to employment status and marital status.
Jelena, Vladić. „Savremene metode ekstrakcije rtanjskog čaja (Satureja montana L.), hemijski sastav i biološka aktivnost dobijenih ekstrakata“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2017. http://www.cris.uns.ac.rs/record.jsf?recordId=104207&source=NDLTD&language=en.
Der volle Inhalt der QuelleThis dissertation investigates the possibilities of applying contemporary processes for obtaining extracts of winter savory (Satureja montana L.).Carvacrol was determined to be the most abundant component in extracts acquired by using supercritical carbon dioxide (of various densities). Extract with the richest content of carvacrol was obtained under conditions of 350 bar and 50 °C (60,82%), while the highest carvacrol yield was produced under 325 bar and 350 bar pressures and at a 60 °C temperature reaching 2.4 g/100 g of dry weight. By applying carbon dioxide on higher pressures, a more efficient carvacrol extraction from herbal material is performed, alongside production of extracts with higher carvacrol content. Other components in the extracts present in significantly lower concentrations are the following: p-cymen, borneol, trans-caryophyllene, caryophyllene-oxide, γ-terpinene and linalool.In order to recognize the possibility of improving the extraction yield produced by employing supercritical carbon dioxide and enhancing the quality of extracts, the influence of several different pre-treatments was investigated. It was determined that the water pre-treatment raises the extraction yield the most (for 25%), while the ultrasonic pre-treatment was the most adequate choice for acquiring extracts with the highest content of carvacrol (66.46%). However, the highest carvacrol extraction yield from 100 g of dry weight was achieved by applying ethanol and water as pre-treatment.Extracts which were attained with subcritical water (by varying the temperature and time of extraction) were chemically characterized and Response Surface Method (RSM) was applied for the purposes of determining conditions of extractions under which the highest quality of extracts in terms of content of polyphenolic compounds and antioxidant activity is reached. The advantage of employing subcritical water over the classical method of extraction in respect of content of polyphenolic components and antioxidant activity was demonstrated.Dry extracts of S. montana obtained by using the spray drying technology (with different concentrations of maltodextrine) were examined in terms of their physical and chemical characteristics. Also, in order to investigate the possibility of their use as functional or food products, sensory analysis of attained extracts was performed, and furthermore, their pharmacological activity in terms of the ACE inhibitory and antioxidant effect was analysed as well.It was determined that the lowest concentration of maltodextrin (10%) was the most adequate for obtaining dry extracts of S. montana with the richest content of polyphenolic components and essential oil, and in respect of antioxidant and ACE inhibitory activities. Also, dry extract with 10% of maltodextrin meets all other physical-chemical parameters, which provide efficient drying and quality of extracts.In vivo activity of selected extracts of S. montana was examined on a model of hepatotoxicity induced by applying carbon tetrachloride. The influence of extracts on liver function, enzyme parameters of oxidative stress, and serum parameters of oxidative damage caused by carbon tetrachloride was analysed and hepatoprotective effect of S. montana extracts was determined. In addition, the influence of extracts on the growth of Ehrlich ascite tumors implanted in mice was investigated, and their impact on biochemical parameters of oxidative stress in tumor cells as well, and it was determined that the time of application of extracts is of great significance.
Jelena, Nađpal. „Fitohemijski skrining i biološka aktivnost ekstrakata i tradicionalnih proizvoda od plodova divljih ruža (Rosa L.;Rosaceae)“. Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104437&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe aim of presented doctoral thesis was investigation of phytochemical composition and biological activity of water and methanol extracts of fresh and air- dried rose hips, as well as purée and jam made according to traditional recipe of hips of six wild growing Rosa L. species: R. canina, R. dumalis, R. dumetorum, R. tomentosa, R. arvensis, and R. sempervirens. Examination of phytochemical composition included LC-MS/MS analysis of 64 selected phenolic compounds, quinic acid (organic acid) and three triterpenoids. Also, total phenolic and flavonoid contents, as well as vitamin C contents were determined spectrophotometrically. Biological activity evaluation of extracts of six Rosa species included in vitro investigation of antioxidant, anti- inflammatory, anti-acetylcholinesterase and cytotoxic activity. According to obtained results, fresh and air-dried rose hips, as well as their preserves present valuable source of vitamin C and phenolic compounds, especially ellagic acid, which was the most abundant examined phenolic compound. Furthermore, high concentration of ursolic acid was detected in some Rosa tomentosa and R. rumetorum extracts, while notable concentration of quinic acid was present in all examined extracts. Extracts of all examined species, apart from Rosa arvensis, showed considerable antioxidant activity in terms of radical scavenging ability, reduction potential and inhibition of lipid peroxidation. Moreover, extracts exhibited moderate anti- inflammatory activity by means of inhibition of the main arachidonic acid metabolites formed incyclooxygenase-1 (12-HHT, TXB2, PGE 2 ) and 12-lipoxygenase (12-HETE) pathway, especially prostaglandin E2 . Also, investigation of anti- cetylcholinesterase activity revealed moderate activity of extracts of all examined species. In addition, predominantly water extracts of fresh andair-dried rose hips, as well as purée of R. canina, R. tomentosa and R. sempervirens showed inhibitory activity toward HeLa, while R.sempervirens extracts also inhibited HT-29 cell growth. Presented results indicate significant potential of examined rose hips and their preserves for use as nutraceuticals and functional food.
Najmi, Ahmed Essawet. „Funkcionalne karakteristike fermentisanog čajnog napitka obogaćenog CoffeBerry®-jem“. Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=101644&source=NDLTD&language=en.
Der volle Inhalt der QuelleThe aim of this study was to investigate fermentation of sweetenedmedium prepared with CoffeeBerry® еxtract and functionalcharacteristics of a kombucha beverage enriched with CoffeeBerry®еxtract. Total phenol concentration in unfermented samples,fermentation broths and kombucha beverages made of CoffeeBerry®еxtract and black tea was determined spectrophotometrically whereasqualitative and quantitative concentration of polyphenolic compoundswas determined by HPLC method. Antioxidant activity on DPPH andhydroxyl radicals in the same samples was determined on an ESRspectrometer. Fermentation broth and kombucha beverage enriched withCoffeeBerry® еxtract had higher antioxidant activity against bothradicals than control samples. Antimicrobial activity of kombuchabeverages optimal acidity was tested against selected strains of bacteria(Gram-positive and Gram-negative) and yeast. The main activecomponent of antibacterial activity was acetic acid, but samples did notshow any activity against yeast Candida albicans and Saccharomycescerevisiae. Antiproliferative activity of fermentation broth with andwithout CoffeeBerry® еxtract was measured by MTT test on followingcell lines: Hep2c (Human larynx carcinom), RD (Rhabdomyosarcoma) iL2OB (murine tumor fibrolast lines trаnsfеcted by some human genes).The highest antiproliferative activity shown fermentation broth enrichedwith CoffeeBerry® еxtract, wherein Hep2c cells was the mostsusceptible.