Nova prizorišča učenja v učečih se mestih – javna pedagogika ter državljanska vzgoja in izobraževanje

Although the concept of learning cities and the idea of learning being place-based and focused on a region, city, town or community have existed for a long time, it is UNESCO’s work that gave the impetus to the practice, helping to create and spread the network of Learning Cities worldwide. One of the main characteristics of the current concept is the leading role of the local government and partnership with policy makers. The paper challenges this feature with the example of cities that are “rebelling” against the local or national government, but do have learning at the core of their activities. The example of Belgrade is described in detail, where various civic actions (protests, ‘guerrilla’ actions, active participation in public discussions) are analysed from the point of view of public pedagogy. The theory of Gert Biesta and his conception of the public sphere as a space for civic action as well as Elizabeth Ellsworth’s ideas on the active creation of space are the framework in which civic actions are interpreted as important kinds of learning. Lefebvre’s concept of the “right to the city” is also applied. In this way, the whole concept of learning cities might be broadened to include cities without a harmonious relationship with its policy makers, but with strong civic movements and civic actions as a kind of non-formal learning in public spaces.Čeprav koncept učečih se mest in ideja o učenju, ki je osredinjena na prostor, torej regijo, mesto ali skupnost, obstajata že dolgo časa, je Unesco to prakso spodbudil ter pomagal ustvariti in razširiti mrežo učečih se mest po vsem svetu. Vodilna vloga lokalnih oblasti in partnerski odnos z oblikovalci politik je ena od poglavitnih značilnosti obstoječega koncepta učečih se mest, vendar v članku prek primerov učečih se mest, ki se »upirajo« lokalni ali nacionalni vladi, ob tem pa imajo v središču svojih dejavnosti učenje, spodbijamo nujnost te značilnosti za nastanek učečega se mesta. Podrobno je opisan primer Beograda in različne oblike državljanskega delovanja (protesti, »gverilsko« delovanje, aktivno sodelovanje v javnih razpravah) v tem mestu, ki so analizirane z vidika javne pedagogike. Okvir, v katerem je državljansko delovanje interpretirano kot pomemben način učenja, tvorita teorija Gerta Bieste z njegovim konceptom javne sfere kot prostora državljanskega delovanja in ideja Elizabeth Ellsworth o aktivnem ustvarjanju prostora. Prav tako je uporabljen Lefebvrov koncept »pravice do mesta«. Na ta način je mogoče idejo učečih se mest razširiti tudi na mesta, v katerih odnosi z oblikovalci politik niso harmonični, obstajajo pa močna državljanska gibanja in državljansko delovanje kot oblika neformalnega učenja v javni sferi

Promotion of Color Sorting in Industrial Systems Using a Deep Learning Algorithm

Color sorting is a technological operation performed with the aim of classifying compliant and noncompliant agricultural products in large-capacity industrial systems for agricultural product processing. This paper investigates the application of the YOLOv3 algorithm on raspberry images as a method developed for the detection, localization, and classification of objects based on convolutional neural networks (CNNs). To our knowledge, this is the first time a YOLO algorithm or CNN has been used with original images from the color sorter to focus on agricultural products. Results of the F1 measure were in the 92–97% range. Images in full resolution, 1024 × 1024, produced an average detection time of 0.37 s. The impact of the hyperparameters that define the YOLOv3 model as well as the impact of the application of the chosen augmentative methods on the model are evaluated. The successful classification of stalks, which is particularly challenging due to their shape, small dimensions, and variations, was achieved. The presented model demonstrates the ability to classify noncompliant products into four classes, some of which are appropriate for reprocessing. The software, including a graphic interface that enables the real-time testing of machine learning algorithm, is developed and presented

Ispitivanje upotrebe otpadne biomase za uklanjanje naftnih ugljovodonika iz vodenog rastvora

Adsorption is one the best commonly used technique for treatment of petroleum contaminated water. The biosorption potential of waste biomass (peach shell, agro-industrial waste) as a low-cost biosorbent for petroleum hydrocarbon from aqueous solution was explored. Biosorption experiments were carried out using a shake-flask technique with a constant amount of (bio) sorbent of 1 g mixed with 100 ml of water contaminated with petroleum hydrocarbons at concentrations of 4 mg/L, 12 mg/L, 18 mg/L, 24 mg/L, 30 mg/L, 40 mg/L and 80 mg/L. The obtained results show that waste biomass is efficient in the removal of petroleum pollutants from the water solution. Biosorption is a potentially alternative technique for wastewater treatment. Their major advantages are low cost, high efficiency, renewability.Adsorpcija je jedna od najčešće korišćenih tehnika za tretiranje voda zagađenih naftom i njenim derivatima. U radu je ispitivana mogućnost primene otpadne biomase (koštice breskve, agroindustrijskog otpada), kao jeftinog biosorbenta, za uklanjanje nafnih zagađivača iz vodenog rastvora u stacionarnim uslovima. Biosorpcioni eksperimenti su obavljeni u erlenmajerima na na orbitalnom šejkeru u kojima je konstantna količina biosorbenta od 1 g mešana sa 100 ml vode kontaminirane naftnim ugljovodonicima u koncentacijama 4 mg/L, 12 mg/L, 18 mg/L, 24 mg/L, 30 mg/L, 40 mg/L and 80 mg/L. Dobijeni rezultati pokazuju da je otpadna biomasa efikasna u uklanjanju naftnih polutanata iz vodenog rastvora. Biosorpcija je potencijalno alternativna tehnika za prečišćavanje otpadnih voda. Njene glavne prednosti su niska cena, visoka efikasnost i obnovljivost.Related to: [https://cherry.chem.bg.ac.rs/handle/123456789/5411

Ptimizacija reverzno‐faznih uslova za razdvajanje liganada serotoninskih receptora u tečnoj hromatografiji

The serotonin receptor ligands, such as structurally related arylpiperazine and benzothiazepine derivatives, are most commonly used in the treatment of schizophrenia, depression, and manic disorders. (1). Due to emphasized lipophilicity, their retention can be successfully defined under the reversed-phase (RP) chromatographic conditions. Using the experimental design methodology (2), the retention of selected serotonin receptor ligands (aripiprazole, ziprasidone, risperidone, olanzapine, quetiapine, mirtazapine) was tested on RP stationary phases, in order to define differences in their retention mechanisms and ensure the further optimization of separation conditions. The silica modified, C8 and pentafluorophenylpropyl (PFP) columns were used as stationary phases, while the mobile phase was a mixture of acetonitrile and ammonium acetate. The experimental plan was defined according to the central composite design varying the following factors: ammonium acetate concentration (15-25 mM), volume fraction of acetonitrile (40-50% v/v), and column temperature (20-30°C). The differences between retention on C8 and PFP columns were presented by using the radar plots and principal component analysis. The obtained differences are especially visible in the case of ziprasidone, olanzapine, quetiapine and mirtazapine, which may explain the occurrence of inversions in their elution order. On C8 phase the separation of structurally related arylpiperazine or benzothiazepine derivatives was achieved, while the PFP phase showed more successful applicability in the separation of all tested ligands. The slightly higher values of the selectivity parameter were obtained for 40% of acetonitrile in the mobile phase. In further optimization of the separation conditions, the PFP bonded stationary phase can be successfully applied.Ligandi serotoninskih receptora kao što su strukturno srodni derivati arilpiperazina i benzotiazepina, najčešće se koriste u terapiji oboljenja centralnog nervnog sistema, poput šizofrenije, depresije, ili maničnog poremećaja (1). Zbog izraženih lipofilnih karakteristika, njihovo retenciono ponašanje se može uspešno definisati u uslovima reverzno-fazne (Reversed‐Phase, RP) tečne hromatografije. Primenom metodologije eksperimentalnog dizajna (2), retencione karakteristike odabranih liganada serotoninskih receptora (aripiprazol, ziprazidon, risperidon, olanzapin, kvetiapin, mirtazapin) su ispitane na RP stacionarnim fazama, sa ciljem definisanja razlika u mehanizmima zadržavanja i daljoj optimizaciji hromatografskih uslova razdvajanja. Kao stacionarne faze korišćene su C8 i pentafluorofenilpropil (PFP) kolone, dok je mobilna faza bila smeša acetonitrila i amonijum- acetata. Plan izvođenja eksperimenta je postavljen prema planu centralnog kompozitnog dizajna variranjem sledećih hromatografskih faktora: koncentracije amonijum-acetata (15- 25 mM), zapreminskog udela acetonitrila (40-50% v/v) i temperature kolone (20-30°C). Primenom linearne regresione analize, definisan je uticaj izabranih faktora na promenu retencionog ponašanja (k) ispitivanih liganada. Korišćenjem radar grafika i primenom analize glavnih komponenti predstavljene su razlike između mehanizama zadržavanja na C8 i PFP kolonama. Razlike su posebno vidljive u slučaju ziprazidona, olanzapina, kvetiapina i mirtazapina čime se može objasniti inverzija u njihovom redosledu eluiranja. Uočeno je da C8 stacionarna faza pogoduje razdvajanju strukturno srodnih arilpiperazina ili strukturno srodnih derivata benzotiazepina, dok je PFP stacionarna faza pokazala uspešniju primenljivost u razdvajanju svih ispitivanih liganada. Nešto veće vrednosti parametra selektivnosti dobijene su na 40% udelu acetonitrila u mobilnoj fazi. U daljoj optimizaciji hromatografskih uslova razdvajanja ispitivanih liganada, stacionarna faza sa vezanim PFP grupama se može uspešno primeniti.VIII Kongres farmaceuta Srbije sa međunarodnim učešćem, 12-15.10.2022. Beogra

Oksidovane huminske kiseline iz toplane

Humic acids isolated from the soil of a heat power plant (HA-E) contaminated with oil were analyzed by Fourier transform infrared spectroscopy (FTIR). In comparison with a humic acids standard (HA-S), a lack of an intense broad band of the stretching vibrations of hydrogen-bonded hydroxyl groups (3600–3200 cm-1) is evident. The HA-E spectra have a peak at 1649 cm-1, which could belong to carbonyl groups. HA-E are heavily oxidized and among the isolated microorganisms, Achromobacter denitrificans may be responsible for such intensive oxidation of HA-E. To the phylogenetically diverse nitrate-reducing microorganisms that have the capacity to utilize reduced HA as electron donors in soils, A. denitrificans can be added.Хуминске киселине, изоловане из земљишта контаминираног нафтом из топлане (HA-E) је анализирано уз помоћ инфрацрвеног спектрометра (FTIR). У поређењу са стандардом хуминских киселина (HA-S) уочљив је недостатак интензивног пика вибрација водоничне везе из хидоксилне групе (3600–3200 cm-1). HA-E има пик на 1649 cm-1 који вероватно припада карбонилној групи. HA-E су веома оксидоване, а претпоставља се да су микроорганизми Achromobacter denitrificans за ову интензивну оксидацију HA-E. Они су филогенетски различити нитрат-редукујући микроорганизми који имају капацитет да редукују хуминске киселине где се понашају као електрон донори у земљишту

Ispitivanje upotrebe otpadne biomase za uklanjanje naftnih ugljovodonika iz vodenog rastvora

Adsorption is one the best commonly used technique for treatment of petroleum contaminated water. The biosorption potential of waste biomass (peach shell, agro-industrial waste) as a low-cost biosorbent for petroleum hydrocarbon from aqueous solution was explored. Biosorption experiments were carried out using a shake-flask technique with a constant amount of (bio) sorbent of 1 g mixed with 100 ml of water contaminated with petroleum hydrocarbons at concentrations of 4 mg/L, 12 mg/L, 18 mg/L, 24 mg/L, 30 mg/L, 40 mg/L and 80 mg/L. The obtained results show that waste biomass is efficient in the removal of petroleum pollutants from the water solution. Biosorption is a potentially alternative technique for wastewater treatment. Their major advantages are low cost, high efficiency, renewability.Adsorpcija je jedna od najčešće korišćenih tehnika za tretiranje voda zagađenih naftom i njenim derivatima. U radu je ispitivana mogućnost primene otpadne biomase (koštice breskve, agroindustrijskog otpada), kao jeftinog biosorbenta, za uklanjanje nafnih zagađivača iz vodenog rastvora u stacionarnim uslovima. Biosorpcioni eksperimenti su obavljeni u erlenmajerima na na orbitalnom šejkeru u kojima je konstantna količina biosorbenta od 1 g mešana sa 100 ml vode kontaminirane naftnim ugljovodonicima u koncentacijama 4 mg/L, 12 mg/L, 18 mg/L, 24 mg/L, 30 mg/L, 40 mg/L and 80 mg/L. Dobijeni rezultati pokazuju da je otpadna biomasa efikasna u uklanjanju naftnih polutanata iz vodenog rastvora. Biosorpcija je potencijalno alternativna tehnika za prečišćavanje otpadnih voda. Njene glavne prednosti su niska cena, visoka efikasnost i obnovljivost.Related to: [http://cer.ihtm.bg.ac.rs/handle/123456789/3305

Ispitivanje upotrebe otpadne biomase za uklanjanje naftnih ugljovodonika iz vodenog rastvora

Adsorption is one the best commonly used technique for treatment of petroleum contaminated water. The biosorption potential of waste biomass (peach shell, agro-industrial waste) as a low-cost biosorbent for petroleum hydrocarbon from aqueous solution was explored. Biosorption experiments were carried out using a shake-flask technique with a constant amount of (bio) sorbent of 1 g mixed with 100 ml of water contaminated with petroleum hydrocarbons at concentrations of 4 mg/L, 12 mg/L, 18 mg/L, 24 mg/L, 30 mg/L, 40 mg/L and 80 mg/L. The obtained results show that waste biomass is efficient in the removal of petroleum pollutants from the water solution. Biosorption is a potentially alternative technique for wastewater treatment. Their major advantages are low cost, high efficiency, renewability.Adsorpcija je jedna od najčešće korišćenih tehnika za tretiranje voda zagađenih naftom i njenim derivatima. U radu je ispitivana mogućnost primene otpadne biomase (koštice breskve, agroindustrijskog otpada), kao jeftinog biosorbenta, za uklanjanje nafnih zagađivača iz vodenog rastvora u stacionarnim uslovima. Biosorpcioni eksperimenti su obavljeni u erlenmajerima na na orbitalnom šejkeru u kojima je konstantna količina biosorbenta od 1 g mešana sa 100 ml vode kontaminirane naftnim ugljovodonicima u koncentacijama 4 mg/L, 12 mg/L, 18 mg/L, 24 mg/L, 30 mg/L, 40 mg/L and 80 mg/L. Dobijeni rezultati pokazuju da je otpadna biomasa efikasna u uklanjanju naftnih polutanata iz vodenog rastvora. Biosorpcija je potencijalno alternativna tehnika za prečišćavanje otpadnih voda. Njene glavne prednosti su niska cena, visoka efikasnost i obnovljivost.Related to: [https://cherry.chem.bg.ac.rs/handle/123456789/5412

The influence of selenium and deiodinases blockers on juvenile rats body weight

In this work there was investigated the influence of selenium and deodinases blockers on juvenile rats body weight during three months. The experiment was carried out on 64 rats divided into eight groups with eight individual animals per group. Following groups were formed: 1. Se+PTU-IA- (control group), 2. Se+PTU+IA+, 3. Se+PTU+IA-, 4. Se+PTU- IA+, 5. Se-PTU-IA-, 6. Se-PTU+IA+, 7. Se-PTU+IA- and 8. Se-PTU-IA+. The groups labeled (Se+) were selenium adequate and they were fed with food that contained 0.334 mg Se/kg. The groups labeled (Se-) were selenium deficient and obtained food with 0.031 mg Se/kg. As deiodinases blockers there were used propylthiouracil (PTU+) in a dose of 150 mg/L of drinking water and iopanoic acid (IA+) in a dose of 6 mg/100 g TM intraperitoneally. Body weight of experimental rats was measured every seven days. After three weeks of treatment there were taken blood samples of animals from all experimental groups and following parameters were determined: selenium concentration in blood, thyroxine (T4), triiodothyronine (T3) and thyroidstimulating hormone (TSH) in blood plasma. Analysis of the samples showed that the animals from the groups treated with PTU had lower body weight in regard to the control group, as well as lower concentration of T3 and T4 in plasma. Selenium deficient rats had lower average body weight compared to the selenium adequate ones after three weeks, but there were no differences in thyroid hormones concentration. The lowest average body weight was noticed in selenium deficient rats groups treated with PTU. [Projekat Ministartsva nauke Republike Srbije, br. TR31050 i br. TR31003

Evaluation of photodynamic therapy efficacy vs. conventional antifungal therapy in patients with poor-fitting dentures suffering from denture stomatitis. A prospective clinical study

Background: The long-term use of antifungal therapy in denture stomatitis (DS) treatment could be accompanied by antifungal-resistant strain onset, leading to compromised therapeutic procedure and disease reappearance. Photodynamic therapy (PDT) has shown the ability to eradicate oral infections and resistance strains. This prospective clinical study aimed to assess the PDT’s effectiveness compared to the conventional treatment on clinical and microbiological parameters in patients with DS without denture wear during the treatment and follow-ups. Methods: Forty-two patients diagnosed with DS were randomly assigned to one-session single PDT application (test group) or conventional antifungal therapy (control group). Clinical and microbiological parameters were assessed and analyzed before and at 3rd, 15th, and 30th day following the treatments. Microbiological samples were analyzed by a Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The data was statistically analyzed. Results: Prior to the treatment, Candida species, including C. albicans (100%), C. glabrata (33%), C. tropicalis (31%), C. krusei (31%) were isolated in all patients. Both treatment procedures demonstrated a statistically significant reduction in C. albicans at all follow-up time intervals (p < 0.05). However, PDT displayed a statistically significant reduction in C. krusei compared to the conventional treatment at all follow-up periods (p < 0.05). Clinical parameters improved considerably in the test group compared to the control group at the 3rd and 15th day of follow-up. Conclusion: One-session single PDT application demonstrated significant improvement in both clinical and microbiological outcomes in a short-term period, resulting in complete Candida spp. eradication compared to conventional antifungal therapy