Teachers' leadership style and teaching effectiveness

Na ključni udeo liderstva nastavnika u učenju učenika, efektivnosti nastavnog pocesa, inovativnim i produktivnim pristupima nastavnom radu, klimi i kulturi na nivou škole, unapređenju škole, izradi politike obrazovanja i planiranju reformi obrazovanja ukazala su istraživanja i praksa drugih zemalja. Reklo bi se da je efektivnost nastave samo jedna od oblasti u kojoj liderstvo nastavnika može pomoći u rešavanju najosetljivijih i relevantnih problema u obrazovanju, a naposletku (i najvažnije) inicira učenike da uče. Poslednjih godina često su u okvir analize uzimani lideri na formalnim pozicijama te su direktori škola u takvim poduhvatima dobili na značaju dok su u potpunosti bibavi skrajnuti oni koji na direktan način doprinose efektivnosti nastave. Upravo usled nedostatka inicijative ali i istraživanja da se u okvir analize uzmu karakteristike ponašanja nastavnika koje direktno doprinose efektivnosti nastave, ovo istraživanje sprovedeno je sa ciljem ispitivanja povezanosti između liderskog stila nastavnika i efektivnosti nastave operacionalizovane kroz pokazatelje povoljne klime za učenje i pokazatelje angažovanosti učenika u nastavi i učenju...Researches and practices in other countries have indicated the key role of teachers’ leadership in students’ learning, effectiveness of teaching process, innovative and productive approaches to teaching, school climate and school culture, school improvement, creating education policy and planning of educational reforms. It can be said that teaching effectiveness is just one area in which teachers’ leadership could help in solving the most sensitive and relevant educational problems, and ultimately, and most importantly initiates students to learn. In recent years, leaders in formal positions have often been the focus of analysis so school principals have become the main figure and most important in such efforts, while those who directly contribute to teaching effectiveness was marginalized. Just because of the lack of initiative and researches that take into account characteristics of teachers' behavior that directly influence teaching effectiveness, this research was conducted with the aim of examining correlations between teachers' leadership style and teaching effectiveness operationalized by the indicators of favorable climate for learning and indicators of student engagement in teaching and learning..

Removal of mineral oil and wastewater pollutants using hard coal

This study investigates the use of hard coal as an adsorbent for removal of mineral oil from wastewater. In order to determine the efficiency of hard coal as an adsorbent of mineral oil, process parameters such as sorption capacity (in static and dynamic conditions), temperature, pH, contact time, flow rate, and chemical pretreatment were evaluated in a series of batch and continuous flow experiments. There were significant differences in the mineral oil removal for various pH values examined. The adsorption of mineral oil increased as pH values diverged from 7 (neutral). At lower temperatures, the adsorption was notably higher. The wastewater flow rate was adjusted to achieve optimal water purification. Equilibrium was reached after 10 h in static conditions. At that time, more than 99% of mineral oil had been removed. At the beginning of the filtering process, the adsorption rate increased rapidly, only to show a minor decrease afterwards. Equilibrium data were fitted to Freundlich models to determine the water-hard coal partitioning coefficient. Physical adsorption caused by properties of the compounds was the predominant mechanism in the removal process

Antioxidative enzymes in the response of buckwheat (Fagopyrum esculentum Moench) to complete submergence

Oxidative stress and antioxidative defense system activity were studied in buckwheat leaves after complete submergence and re-aeration. The levels of H2O2 and lipid peroxidation were found to be significantly higher in stressed than in untreated buckwheat leaves. Enzymes catalyzing the degradation of H2O2 and peroxides were shown to participate actively, whereas superoxide dismutase did not take part in the buckwheat leaf response to flooding stress. The most prominent increase in antioxidative enzyme activities was noticed upon return to air, when the strongest oxidative stress occurred and the need for antioxidative defense was the greatest

Iron salt-promoted oxidation of steroidal phenols by m -chloroperbenzoic acid: a route to possible antitumor agents

Iron salt-promoted reaction of estrone and its derivatives with meta -chloroperoxybenzoic acid was developed and epoxyquinols were further transformed. Most compounds showed in vitro antiproliferative activity. , A new oxidant, containing m -chloroperoxybenzoic acid (MCPBA) and an iron salt, was developed and used for oxidation of steroidal phenols to a quinol/epoxyquinol mixture. Reaction was optimized for estrone, by varying initiators (Fe-salts), reaction temperature, time and mode of MCPBA application. A series of five more substrates (17β-estradiol and its hydrophobized derivatives) was subjected to the optimized oxidation, providing corresponding p -quinols and 4β,5β-epoxyquinols in good to moderate yields. The obtained epoxyquinols were additionally transformed by oxidation, as well as the acid-catalyzed oxirane opening. In a preliminary study of the antiproliferative activity against human cancer cell lines, all newly synthesized compounds expressed moderate to high activity

Activity patterns and habitat preference of eastern Hermann’s tortoise(Testudo hermanni boettgeri) in Serbia

We analyzed variation in the distribution of eastern Hermann’s tortoise (Testudo hermanni boettgeri) in a complex landscape consisting of both natural and human-altered habitats in a temperate climate region in Serbia. Our results indicated nonrandom distribution of tortoises within different habitat types with large and medium effect size for year and activity pattern, respectively. Additionally, the tortoises expressed relatively weak preference for habitats modified by human activity (e.g., vineyards, orchards, or gardens). The results suggested that these tortoises preferred some particular habitats more than others when performing specific activities. They also did not exhibit the same distribution pattern among habitats over consequent years. In other words, they were not randomly distributed among habitat types with regard to specific activity or year. The information on preferences in complex habitat systems is important for the conservation management of eastern Hermann’s tortoise and should be considered when planning activities related to sustainable development within the region of study

Supplementary data for the article: Filipović, N. R.; Marković, I.; Mitić, D.; Polović, N.; Milčić, M.; Dulović, M.; Jovanović, M.; Savić, M.; Nikšić, M.; Andelković, K.; et al. A Comparative Study of In Vitro Cytotoxic, Antioxidant, and Antimicrobial Activity of Pt(II), Zn(II), Cu(II), and Co(III) Complexes with N-Heteroaromatic Schiff Base (E)-2-[N’-(1-Pyridin-2-Yl-Ethylidene)Hydrazino]Acetate. Journal of Biochemical and Molecular Toxicology 2014, 28 (3), 99–110. https://doi.org/10.1002/jbt.21541

Supplementary material for: [https://doi.org/10.1002/jbt.21541]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1509

Supplementary data for the article: Filipović, N. R.; Marković, I.; Mitić, D.; Polović, N.; Milčić, M.; Dulović, M.; Jovanović, M.; Savić, M.; Nikšić, M.; Andelković, K.; et al. A Comparative Study of In Vitro Cytotoxic, Antioxidant, and Antimicrobial Activity of Pt(II), Zn(II), Cu(II), and Co(III) Complexes with N-Heteroaromatic Schiff Base (E)-2-[N’-(1-Pyridin-2-Yl-Ethylidene)Hydrazino]Acetate. Journal of Biochemical and Molecular Toxicology 2014, 28 (3), 99–110. https://doi.org/10.1002/jbt.21541

Supplementary material for: [https://doi.org/10.1002/jbt.21541]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1509

Improving the monitoring of water supply, sanitation and hygiene in health institutions

Providing safe drinking water, sanitation and hygiene (WASH) in health care facilities has a central place in achieving universal and equal access to WASH for all. Well-organized supply of safe drinking water, sanitation and hygiene in health institutions is essential for patient health, quality of care, prevention and control of infections, suppression of antimicrobial resistance and improvement of ecological sustainability of the health system. Improving and maintaining WASH in healthcare institutions is a cornerstone in achieving SDGs, in particular SDG 6: Securing accessibility and sustainable water management and sanitation for all and SDG 3: Providing healthy living and promoting prosperity for all in all ages

Removal of mineral oil and wastewater pollutants using hard coal

This study investigates the use of hard coal as an adsorbent for removal of mineral oil from wastewater. In order to determine the efficiency of hard coal as an adsorbent of mineral oil, process parameters such as sorption capacity (in static and dynamic conditions), temperature, pH, contact time, flow rate, and chemical pretreatment were evaluated in a series of batch and continuous flow experiments. There were significant differences in the mineral oil removal for various pH values examined. The adsorption of mineral oil increased as pH values diverged from 7 (neutral). At lower temperatures, the adsorption was notably higher. The wastewater flow rate was adjusted to achieve optimal water purification. Equilibrium was reached after 10 h in static conditions. At that time, more than 99% of mineral oil had been removed. At the beginning of the filtering process, the adsorption rate increased rapidly, only to show a minor decrease afterwards. Equilibrium data were fitted to Freundlich models to determine the water-hard coal partitioning coefficient. Physical adsorption caused by properties of the compounds was the predominant mechanism in the removal process

Management performance warehousing in PE 'Post Serbia'

The paper presents a general model for the strategic management of postal infrastructure and resources, focused on development of warehousing service. The model was developed according to the characteristics of the public enterprise 'Pošte Srbije'. A set of indicators is developed for the purpose of analysis of external and internal environment of PE 'Post Serbia'. For positioning the focal postal enterprise among other, selected European posts, the benchmarking method is used, whereby indicators are determined by using eigenvalues and eigenvectors. Analysis of internal environment additionally includes survey and Delphi method to obtain the values of coefficients in the model. With small modifications, the model could be applicable to all postal operators and logistics companies which consider to develop warehouse service in logistics market