Trg Dositeja Obradovica

Novi Sad, Serbia

Trg Dositeja Obradovica

Novi Sad, Serbia
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Balos S.,Trg Dositeja Obradovica | Sidjanin L.,Trg Dositeja Obradovica | Pilic B.,Bulevar Cara Lazara | Pavlicevic J.,Bulevar Cara Lazara
Materiale Plastice | Year: 2011

The aim of this study was to test the hypothesis that microwave post-polymerization treatment influences the rise of hardness, flexural strength, impact strength and fracture toughness of autopolimerizing poly(methylmethacrylate) by the decrease in residual monomer content. Specimens produced from a commercial acrylic denture reline resin were polymerized according to manufacturers instructions. Control group was left untreated, while other five were post irradiated in a microwave oven with different power and time settings, keeping the irradiation energy constant. Each group of samples was tested for mentioned mechanical properties. Enthalpies of polymerization were tested by differential scanning calorimetry (DSC), while the amount of residual monomer was determined using fourier transform infra-red spectroscopy (FTIR). Microwave post-irradiation resulted in increase of all tested mechanical properties. The highest mecanical properties were obtained with maximum irradiation power, which was confirmed by the results of ANOVA statistical analysis. It has been found that residual monomer content strongly influences the benefits in all tested mechanical properties, increasing biocompatibility. These results have been confirmed by the results of Scanning electron microscope (SEM) fracture surface analisys.

Murienne J.,Harvard University | Karaman I.,Trg Dositeja Obradovica | Giribet G.,Harvard University
Journal of Biogeography | Year: 2010

Aim To investigate the phylogeny of the genus Cyphophthalmus in the Balkan Peninsula and to test the current recognition of 'phyletic lines' and phylogenetic groups proposed in previous studies in order to elucidate the biogeographical history of the region. Location Europe, Balkan Peninsula, Adria microplate. Methods Two mitochondrial (cytochrome c oxidase subunit I and 16S rRNA) and two nuclear (28S rRNA and 18S rRNA) markers were used to infer the phylogenetic history of the group. Molecular dating with relaxed molecular clocks was used to elucidate the relative time of diversification within the genus Cyphophthalmus and its constituent lineages. Results Our analyses confirm the monophyly of the genus Cyphophthalmus, and that of the Aegean and gjorgjevici lineages, whereas the 'Dinaric lineage' appears paraphyletic. Main conclusions We show that the genus Cyphophthalmus is an old endemic from the Balkan biogeographical region, which gave origin to at least three main lineages. Those lineages have diversified within overlapping ranges. According to our molecular dating, they have also diversified within the same timeframe. The Dinaric Alps, although presenting a large number of species, cannot be inferred as the centre of origin of the group. Instead, the biogeographical evolution of the genus could be related to the palaeogeographic history of the Adria microplate. © 2009 Blackwell Publishing Ltd.

Plavsa N.,University of Novi Sad | Stanacev V.,University of Novi Sad | Milosevic N.,Trg Dositeja Obradovica | Ljubojevic D.,Trg Dositeja Obradovica | And 3 more authors.
Journal of Animal and Plant Sciences | Year: 2012

The study was to present the results of growing production of trout, which were conducted in full system pond with the surface of 4,164 ha, which is supplied with water of high quality, constant temperature 10 °C throughout the whole year. For the experiment we have used rainbow trout fry of an average weight of 88-90 g and length 190-210 mm. The experiment involved a total of 5240 individuals, which lasted 90 days. Nutrition of control groups was performed by standard industrial pellets, which contained 41.49% protein and 9.27% fat. Feeding the experimental group was performed with 75% standard industrial pellets and 25% of the meal is made fresh anchovies. This meal contained 36.49% protein and 8.89% fat. After 90 days we have achieved the following results: the experimental group achieved a total weight gain of 67.80 g (0.753 g/day), while the control group achieved total realized gain of 44.47 g(0.494 g/day). The total increase in length of fish in the experimental group was 41.19 mm (0.457 mm/day), while the fish in the control group achieved a total increase of 29.410 mm. Feeding coefficient expressed on dry matter (kg DM) after 90 days in the control group was 1.92, while in the experimental group was 1.16. The fresh anchovies in the amount of 25% of a meal gave gut results in the control group: increased weight gain of 47.94%, increased length growth of fish for 40.18% and reduced feed conversion 28.64%.

Vidovic V.,Trg Dositeja Obradovica | Nemes Z.,PIK Becej | Popovic-Vranjes A.,Trg Dositeja Obradovica | Lukac D.,Trg Dositeja Obradovica | And 3 more authors.
Mljekarstvo | Year: 2013

In the current study, among 420 Holstein cows, the following ratios of κ-casein genotypes were found: 0.25 were AA, 0.52 were AB and 0.23 were BB. Frequencies of alleles A and B were 0.51 and 0.49, respectively. Cows with κ-casein AA and AB genotypes produced 322.72 and 464.73 kg more milk per year compared to cows of casein BB genotype (P<0.05), respectively. There were no significant differences in the amount of milk produced by cows of AA and AB casein genotypes. There were no statistically significant differences in overall yields (kilograms per year) of milk fat and milk protein between κ-casein genotypes of cows. In contrast, milk from genotype BB cows contained a significantly (P<0.05) higher percentage of milk fat compared to the milks of casein genotypes AA and AB. In spite of the different κ-casein genotypes having a significant influence on milk yield and fat content, heritability estimations showed that all three genotypes were of medium heritability, and heritability did not differ significantly between them. Variability values (of examined traits) were stable and large enough to ensure selection gains in future generations.

Slivka J.,Trg Dositeja Obradovica | Kovacevic A.,Trg Dositeja Obradovica | Konjovic Z.,Trg Dositeja Obradovica
Acta Polytechnica Hungarica | Year: 2013

In this paper we propose a novel semi-supervised learning algorithm, called Random Split Statistic algorithm (RSSalg), designed to exploit the advantages of co-training algorithm, while being exempt from co-training requirement for the existence of adequate feature split in the dataset. In our method, co-training algorithm is run for a predefined number of times, using a different random split of features in each run. Each run of co-training produces a different enlarged training set, consisting of initial labeled data and data labeled in the co-training process. Examples from the enlarged training sets are combined in a final training set and pruned in order to keep only the most confidently labeled ones. The final classifier in RSSalg is obtained by training the base learner on a set created this way. Pruning of the examples is done by employing a genetic algorithm that keeps only the most reliable and informative cases. Our experiments performed on 17 datasets with various characteristics show that RSSalg outperforms all considered alternative methods on the more redundant natural language datasets and is comparable to considered alternative settings on the datasets with less redundancy.

Vidovic V.,Trg Dositeja Obradovica | Lukac D.,Trg Dositeja Obradovica | Nemes Z.,PIK Becej | Trivunovic S.,Trg Dositeja Obradovica
Animal Science Papers and Reports | Year: 2014

In 765 Holstein-Friesian cows, the following ratios of β-lactoglobulin genotypes were found: 0.23 AA, 0.58 AB and 0.19 BB. The cows of AA genotype yielded more milk and milk fat than cows of genotype AB and BB. Cows with β-lactoglobulin AA and AB genotypes yielded respectively 224 and 190 kg more milk per lactation when compared to cows of BB genotype but the differences were not significant. There were significant (P<0.01) differences in the yield of milk protein produced by cows of the AB, BB and AA genotypes. Milk from cows of genotype AA and BB contained a slightly higher percentage of milk fat when compared to milk of cows with lactoglobulin genotype AB. Percentage of milk protein was higher in the milk of cows of genotype BB and AB. β-lactoglobulin genotype had a significant impact on the yield of milk protein (P<0.01), but had no influence on the other observed properties of milk.

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