Serbian Academy of Sciences and Arts
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Surface-modified metallic biomaterials as systems for localized anticancer effects
No full textSurface modification of metallic biomaterials offers a promising strategy to enhance therapeutic potential of multifunctional implants through interaction with the biological environment. In this study, we developed a bioactive titanium (Ti) surface with anticancer activity against oral squamous cell carcinoma cells (OSCC). A combined anodizing/anaphoretic electrodeposition technique was applied, and a coated titanium composite-Ti/Coating system with nano-hydroxyapatite (nHAp), chitosan-oligolactate (ChOL), and selenite (Se) was fabricated with improved biological functionality. Our results showed that the Ti/Coating significantly reduced cell viability and induced early apoptosis, compared to uncoated titanium. Elevated intracellular ROS levels, nanoparticle uptake, and apoptosis-associated gene modulation (BAX upregulation and BCL2 downregulation) were observed. Additionally, the Ti/Coating suppressed EMT markers (VIM, SLUG, SNAIL), downregulated oncogenic signaling (AKT/mTOR, Wnt/β-catenin), and reduced cell migration. These findings highlight the potential of bioactive, surface-engineered titanium implants to provide localized anticancer activity, particularly in postoperative therapy
Surface engineering of TiO2 nanotubes with tantalum for improved electrochemical performance
No full textIn this work, TiO2 anatase nanotubes (NTs) were synthesized using a straightforward, two-step anodic oxidation method. To tackle with the optical and electrical properties of the material, a thin layer of tantalum was sputtered onto the nanotube surface. The microstructure of the modified material was analyzed using scanning and transmission electron microscopy (SEM and TEM), while changes in chemical bonding were examined by utilizing X-ray photoelectron spectroscopy (XPS). Structural analysis found the formation of the β-Ta2O5 phase on the surface of the deposited TiO2 NTs. Electrical resistivity, measured with the 4-point probe technique, showed a reduction in resistivity for the modified material, implying an increase in conductivity. Diffuse reflectance spectroscopy (DRS) showed an increase in the energy gap from 3.05 eV to 3.85 eV, while photoluminescence (PL) spectra revealed a suppression of deep-level trap states within the bandgap for modified NTs. These results indicate that increased conductivity can most probably be attributed to the reduction of Ti4+ to Ti3+, modification of surface oxygen states and suppression of deep-level trap states within the bandgap for Ta deposited nanotubes. Electrochemical tests further revealed improved capacity for Li-ion intercalation, as well as coulombic efficiency, particularly at elevated temperatures
CaV206 vs. ZnV206: Evaluating Zn2+ Storage Behavior in Aqueous Electrolytes
No full textThe transition from fossil fuels to renewable energy sources requires the development of innovative and enviro nmentally fri endly electrochemical energy storage systems. Aqueous zinc-ion batteries (AZBs) have emerged as a promising alternative due to their inherent safety, low cost , and environmenta l sustainability. Among various cathode materials, layered vanadium oxides, part icularly MVZ0 6metavanadates (M =Mg, Ca, Cu, Mn, etc.), have been proposed as stable host materials offering high electrochemical activity for Znz+ storage in aqueous media.
In this study, CaVZ06 and ZnVZ06 metavanadate composites (labelled as CaVO/C and ZnVO/C) are synthesized via a malonic acid-assisted solution combustion method and examined as cathode materials in three different Zn-based aqueous electrolytes: Zn(N03)z, ZnClz and ZnS04. The influence of th e electrolyte anion on the cyclic voltammetry (CV) profiles and capacity-cycle dependence of the metavanadates is explored through a combination of CV and ex-situ Fourier-transform infrared spectroscopy (FTIR). Both CaVO/C and ZnVO/C exhibit the best electrochemical performance in Zn(N03)z electrolyte, mainta ining high and stable specific capacities over prolonged cycling. The obtained results indicate that in Zn(N03)z, both composites enable efficient Znz+ storage through simultaneous insert ion of Znz+ and W/H30+. As a result, CaVO/C and ZnVO/C deliver a high specific capacity of approximately::: 167 and 293 mAh s' at 0.5 A s'. respectively. To gain insight into the Znz+ charge storage mechanism and the influence of pre-inserted metal ions, the structural evolution of both materials before and after the insertion/deinsertion processes is examined using X-ray powder diffraction (XRPD) and FTIR
Synthesis of cathode materials based on NaFeO, polymorphs
No full textGlobal concern s regarding environment al pollution and the energy crisis draw attention to the necessity of using earth-abundant and environmentally benign elements in the preparation of battery mate rials. In this study. we discuss the synthesis of a potential cathode material for room-temperature sodium-ion battery applications from abundant, non-toxic elements, specifically NaFe02. A solid-state topotaxy reaction was employed for the synthesis. It was found that the formation of either the alpha-NaFe02 phase or the beta-NaFe02 phase strongly depend s not only on the nature of the starting materials and the calcination temperature but also on the type of chemical reaction involved. Specifically, the solid -liquid reaction favors the formation of the a-NaFe02 phase,while th e solid- solid react ion favors the beta-Na FeO l phase. The structures of the synthesized powders were investigated using X-ray diffract ion (XRD) techniques and crystal structure refinement s. The structures of the alpha- and beta- phases were refine d in space groups R-3m and Pna21, respectively. Furthermore, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) techniques were used to characterise the materials. The electrochemical measurements revealed significant differences between the two polymorphs, which opens up various possibilities for their application as cathode materials
Linking Density and Nanoscale Crystallinity to Hydration in Nafion PEMFC Membranes: Insights From Experiment and Molecular Dynamics Simulations
No full textProton exchange membrane fuel cells (PEMFCs) powered by hydrogen are promising for a wide range of energy-conversion applications, with Nafion remaining the most widely used membrane material. Here, by comparing experimental data and molecular dynamics (MD) simulation results, we examine how a measurable property, the density, relates to the structure of Nafion at different water contents (λ). Voronoi tessellation and free-volume analysis of MD results confirm that crystallinity and effective density are strongly correlated, highlighting the role of structural ordering. Further analysis of water clustering reveals isolated molecules at low hydration, while percolating networks form at higher λ, particularly within crystalline systems. Simultaneously, the density of confined water exhibits variations reaching values up to ≈1.2 g/cm3. We propose a model that bridges experimental and molecular observations by quantitatively linking water uptake to density variations, offering a predictive framework for optimising hydration and transport in membranes. Understanding how membranes with varying levels of crystallinity respond to changes in water content helps translate nanoscale mechanisms into practical designs for industrial PEMFCs
Republic of Serbia energy strategy 2045 analysis and its ambitious improvements simulation using soft-linking of tools
No full textIn 2024, a draft of the Energy Development Strategy of the Republic of Serbia until 2040, with projections until 2050, was presented. Strategy C of this document outlines a future, ambitious scenario for the development of Serbia's power system. This paper focuses on analyzing the impact of measures proposed by the strategy, which were integrated into EnergyPLAN to evaluate the achievement of specific energy, economic, and environmental indicators. The results highlight the limitations of the proposed strategy in achieving sustainable energy goals. In this regard, alternative, more ambitious energy strategies will be explored to address the further ambitions outlined within the EU harmonization frameworks. From previous research, it is known that the scale of such ambitions will influence neighboring power systems. A soft coupling with the CASE energy flow tool will be used to maintain these increased ambitions within the technical feasibility constraints, particularly a higher variable share of renewable energy. This approach will verify the most critical operational hours, quantify the effects on energy exchange, and identify the most critical elements in the most vulnerable zones requiring investment
Carbon screen-printed electrodes modified with ZnO nanoparticles/surfactant for sensitive electrochemical determination of doxorubicin and diclofenac
No full textPharmaceuticals such as beta-blockers, antibiotics, nonsteroidal anti-inflammatory drugs, and neuroleptics can often be found in drinking water and therefore pose a risk to public health. Due to their environmental impact, the detection of these pharmaceuticals is of great importance. Electrochemical sensors (ECS) are widely used today because they exhibit high sensitivity, selectivity, and reproducibility. Doxorubicin and Diclofenac are commonly used pharmaceuticals and are therefore frequently detected as water pollutants. In this research, to enhance selectivity and sensitivity of ECS, surface modification of carbon screen-printed electrodes was applied. The carbon screen-printed electrodes were modified with zinc oxide nanoparticles synthesized by microwave processing of precipitate without (ZnO) and with aid of surfactants, precisely with cetyltrimethylammonium bromide (ZnO/CTAB) and Pluronic F127 (ZnO/Plu). The crystal structure, morphology and optical properties of the synthesized materials were analyzed by XRD, FESEM, BET, Raman, UV-Vis DRS, and PL spectroscopy. The qualitative and quantitative detection of Diclofenac (infusion solution, 75 mg DCF / 3 mL, Galenika a.d.) and Doxorubicin (infusion solution, Ebewe Pharma, 50 mg DCF / 25 mL) in water was performed using differential pulse stripping voltammetry. All measurements were performed in 25 mL of phosphate buffer (pH=7) by adding the analyte in precisely defined portions. The obtained results showed that carbon screen-printed electrodes surface modified with zinc oxide-based materials can be effectively used to detect Doxorubicin and Diclofenac as water pollutants with a low limit of detection and quantification. Enhanced electrochemical activity of the surface modified electrodes were attributed to altered crystal structure and morphology of zinc oxide particles
Bibliography of the Journal Mузикологија - Musicology : (2001-2025) : special edition marking the twenty-fifth anniversary
No full textСвака библиографија открива више од списка текстова, она је сведочанство научне истрајности и трајног дијалога унутар библиографске дисциплине. У њеним редовима исписана је историја једног подухвата – од токова идеја, преко развоја методологија, па до гласова истраживача који су обликовани временом. Такво разумевање библиографије обликовало је и њен историјски пут, који на својим почецима „открива зачињања свести о важности сопственог народа кроз бележење података о његовој духовној баштини” (Вранеш 2006, 34). Посматрано у историјској перспективи, замеци библиографије постојали су у античкој Грчкој, она се „у Европи укоренила у средњем веку”, а потом се „учврстила у време
Француске револуције и широко разгранала током XIX века, када су већ увелико развијене њене различите врсте, зависно од садржине, значаја, степена обухвата грађе, временског распона, распореда, облика, територијалне и језичке припадности, начина обраде, врсте описа и врсте пописаних публикација” (2006, 34). Иако данас постоје бројне библиографије из домена културне историје, књижевности и других друштвено-хуманистичких наука, важно је истаћи да из области музичке уметности то још увек није случај, посебно када је реч о библиографији музичких часописа. Наиме, разлог можемо пронаћи у томе што су музички часописи објављивани у значајно мањем броју него они из области књижевности или историје. У чланцима музиколога наилазимо на податке да су први српски музички часописи
угледали светлост дана у XIX веку, те да се њихово објављивање везује за певачка друштва и њихову популаризацију (Маринковић 2007, 681). Ипак, умерено скроман корпус музичких часописа, од најстаријих до оних који излазе и у данашње време, није у целости библиографски обрађен.Every bibliography contains more than a mere list of texts; it serves as a testament to scholarly perseverance and a sustained dialogue within the bibliographic discipline. Within its lines, the history of an endeavor is inscribed – the circulation of ideas, the development of methodologies, and the voices of researchers shaped by time. Such an understanding of bibliography has also
shaped its historical trajectory, which, at its inception, “reveals the beginnings of awareness regarding the importance of one’s own people through the recording of data on their spiritual heritage” (Вранеш 2006, 34). Viewed from a historical perspective, the seeds of bibliography can be traced to ancient Greece; it “took root in Europe during the Middle Ages,” was later “consolidated during the French Revolution, and branched out extensively during the nineteenth century, when its various types were already well-developed, depending on content, significance, scope of material, time span, arrangement, form, territorial and linguistic affiliation, processing method, description type, and the type of publications listed” (2006, 34). Although today there are numerous bibliographies in the fields of cultural history, literature, and other social sciences and humanities, it is important to emphasize that this is not yet the case in the field of musical art, particularly regarding the bibliography of music journals. Indeed, the reason may be found in the fact that music journals were published in significantly smaller numbers than those in literature or history. In musicologists’ articles, we find data indicating that the first Serbian music journals saw the light of day in the nineteenth century, and that their publication was linked to choral societies and their popularization (Маринковић 2007, 681). Nevertheless, the moderately modest corpus of
music journals, from the oldest to those still published today, has not been entirely bibliographically processed
Symphonic Music after 1945. Book of Abstracts
No full textInternational scientific conference "Symphonic Music after 1945", organised by the Institute of Musicology and Department of Arts of the Serbian Academy of Sciences and Arts, 29-31 October 2025.Међународна научна конференција ”Симфонијска музика после 1945. године”, у организацији Музиколошког института и Одељења уметности Српске академије наука и уметности, 29-31. октобар 2025
Фолклористика: часопис Удружења фолклориста Србије / Folkloristika: Journal of the Serbian Folklore Association
No full textТема броја: Нови Пазар у старом руху и новом оделу –култура живљења, традиција, обичаји,
веровања / уредница темата Нина Акси