Serbian Academy of Sciences and Arts
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Sunlight-driven catalytic degradation of tetracycline by α-NaYF4@TiO2-Acac nanoparticles and the toxicity of intermediate products
No full textUp-converting α-NaYF4@TiO2-Acac core-shell nanoparticles, synthesized via hydrothermal treatment and sol-gel coating, were used for photocatalytic degradation of a tetracycline solution under a solar simulator. The synthesized structures exhibited wide spectral response capability, enabling up to 90 % degradation within 6 h, at a photocatalyst concentration of 10 mg L−1. Highly reactive superoxide radicals (O2−) were found to be the major reactive species responsible for tetracycline photo-oxidation. The boosted generation of superoxide radicals is attributed to an additional energy transfer from the core to the shell, established through direct radiation-reabsorption process and Förster resonance energy transfer. The absence of toxicity in tetracycline intermediates, formed on photodegradation, suggests the potential of α-NaYF4@TiO2-Acac core-shell nanoparticles for application in wastewater treatment.Peer-reviewed manuscript: [https://hdl.handle.net/21.15107/rcub_dais_18667
Surface engineering of titanium implants via anodization: Enhancing electrochemical stability and cellular response for long-term biocompatibility
No full textThe long-term success of titanium-based biomedical implants is strongly influenced by their surface properties, corrosion resistance, and biological compatibility. This study aims to systematically evaluate them effects of anodic oxidation on the electrochemical stability and biocompatibility of commercially pure titanium (cpTi, grade IV), with a focus on its application in dental and orthopedic implants. Anodization was performed in 1 M H2SO4 at a constant voltage of 15 V for 15 and 45 minutes to produce oxide layers of varying thickness and surface characteristics. Surface morphology and chemical composition were characterized using SEM coupled with EDS, while X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were utilized to elucidate and observe the phase transitions of the synthesized titanium oxides. The oxide layer thickness was estimated using a frequency-dependent capacitance method, revealing values of approximately 40 ± 15 nm and 90 ± 30 nm for 15- and 45-minute treatments, respectively. Corrosion performance was assessed in 9 g L-1 NaCl (pH 7.4), demonstrating superior corrosion stability of anodized samples compared to untreated cpTi. Cyclic polarization tests confirmed the absence of pitting corrosion, indicating that oxygen evolution was the predominant electrochemical process. Biocompatibility was evaluated by examining mitochondrial activity and gene expression in human gingival fibroblasts. The anodized surfaces, particularly those treated for 45 minutes (Ti-45), enhanced cellular adhesion and spreading. Both experimental groups, Ti-15 and Ti-45, showed a significant upregulation of N-cadherin and Vimentin. Additionally, the anodized surfaces exhibited improved hydrophilicity and elevated surface energy values, rising from 58.8 mJ m⁻² for untreated Ti to 65.1 mJ m-2 for Ti-45. The results highlight that anodic oxidation not only improves corrosion resistance but also enhances surface-driven cellular responses, supporting its potential use in optimizing implant integration and longevity in physiological environments
Tunnel structured Na0.54MnO2 nanorods synthesized at high-temperature: Cathode material for aqueous Na-ion batteries
No full textThe Na0.54MnO2 powder is synthesized by the glycine nitrate method followed by annealing at 950 °C. Its crystal structure resembles a 3d tunnel with rod-like shapes, with an average crystallite width of 130 nm and a length in the micron range. The electrochemical performance of the Na0.54MnO2 - based electrode is tested in a NaNO3 solution. During potential cycling, the Na+ ions intercalation/deintercalation processes remain reversible, indicating good stability. For the current densities of 1000, 2000, and 5000 mA g−1, the calculated specific capacities are 72.6, 66.8, and 57.5 mAh g−1, respectively. Due to its suitable morphology for easy Na+ ions intercalation/deintercalation and good electrochemical performance, Na0.54MnO2 is a promising cathode material for aqueous Na-ion batteries
Елементи магијског у Шестом певању "Енеиде"
No full textУ раду се са књижевно-антрополошких и историјско-религијских позиција анализира мотив силаска у Доњи свет (грч. nekyia, лат. descensus ad inferos) у шестом певању Вергилијеве "Енеиде". Реч је о једном од најпознатијих античких наратива везаних за силазак у Доњи свет, који је досад углавном анализиран у свом књижевно-историјском и политичком контексту, те с обзиром на његове религијско-филозофске темеље. У овом раду Вергилијевом наративу приступа се са позиција античке магијске праксе и магијских веровања. Анализирају се мотиви са могућим магијским конотацијама, а Вергилијев опис пореди се са оловним таблицама за клетве (tabulae defixionum) и орфичким златним листићима. Показује се да је присуство магијског у Вергилијевој песничкој обради знатно веће и важније него што се у науци уважавало
Недељко Богдановић. Мали речник села Бучума. Српски дијалектолошки зборник LXX/1 (2023): 369–634 стр
No full textNano Composite Coating on Titanium with Anti-Cancer Activity: A Strategy for Preventing Oral Cancer Recurrence
No full textThe chemical modification of titanium implant surfaces significantly influenced their biological interactions. A novel surface design was developed that transitions from anticancer-inert to highly bioactive against oral squamous cell carcinoma (OSCC) cells. Titanium samples were coated using a combined anodizing and anaphoretic electrodeposition technique. The biological responses of coated (Ti/Coating) versus uncoated (Ti) titanium were evaluated in SCC-25 cells. Flow cytometry assessed apoptosis, cellular uptake, ROS generation, and cell cycle progression, while gene and protein expression were analyzed using qPCR and Western blot. The Ti/Coating surface significantly reduced cell viability, induced early apoptosis (via BAX upregulation and BCL2 downregulation), and caused G2/M cell cycle arrest. Increased ROS production contributed to cytotoxicity. Expression of EMT markers (VIM, SNAIL, SLUG) was inhibited, while CDH1 was upregulated, correlating with reduced cell migration. Furthermore, Ti/Coating suppressed AKT/mTOR and Wnt/β-catenin signaling pathways. These findings demonstrate that engineered titanium coatings can actively suppress OSCC cell proliferation and migration, offering a promising approach for bioactive implant surfaces with dual structural and therapeutic functions
Time-resolved measurements of the E–H transition in a microwave driven ICP source
No full textThe transition dynamics from the electrostatic to electromagnetic (E–H) coupling in a 2.45 GHz excited inductively coupled plasma (ICP) source is investigated using a set of microwave time-resolved records at different frequencies. This method, coming from semiconductor physics, has been newly adapted for plasma investigations. Nitrogen and oxygen plasmas have been analyzed in the range 20–1000 Pa with a constant excitation power of 40 W. With a resolution better than 100 ns, one can identify, depending on pressure, the coexistence of the E and H modes, a hybrid EH mode, and, in the case of oxygen plasma, the transition from negative to positive ions. The E–H transition time increases with pressure
INSAM Journal of Contemporary Music, Art and Technology 15 (II/2025)
No full textThe main theme of the INSAM Journal of Contemporary Music, Art and Technology No. 15, another issue in the journal’s ongoing development that we are delighted to celebrate as a milestone and on the occasion of the INSAM Institute’s 10th anniversary, is “Radio Art”. In the year that marks the 40th anniversary of the Sound Workshop [Radionica zvuka], a serial dedicated to radio art produced in Radio Belgrade, we were inspired to invite collaborators to write on the histories, presents and futures of this artistic form. In response, we received five original articles discussing the histories of radio art serials, competitions, a radio documentary drama as a result of a collaborative educational project and radiophonic genres. Moreover, this theme was not merely contained in the Main Theme section, but was also marked by contributions in the (Inter)Views and the Reviews sections
Music Can Change the World: A Conversation with Composer Nataša Bogojević
No full textNatasha Bogojevic is an award-winning and internationally acclaimed composer and pianist
who has earned global recognition for her highly original, passionate, and imaginative pieces.
Her music, which encompasses works for symphony orchestra, various chamber ensembles,
choral and vocal pieces, multimedia works, ballet, and scores for theater and film, has captivated audiences worldwide. She has received numerous awards, including the National Public Radio Award, International Rostrum of Composers, Festival Expresiones Contemporaneas, Opera
Contempo, Joseph Je&erson Award, and New Music Chicago, as well as honorable mentions at
the prestigious USA MACRO Competition, the American Prize Competition, and NYC Contemporary Music Symposium at Columbia University. Natasha has also dedicated herself to educating generations of musicians in Europe and the US. She has been a part of the music faculty at DePaul University School of Music since 2003 ([email protected])
Barbarians to Christians and Rhomaioi: Integrating the Christians of the Central Balkans into the Byzantine Empire (late 10th – mid-13th century)
No full textThis monograph results from research conducted within the project “From Barbarians to Christians and Rhomaioi. The Process of Byzantinization in the Central Balkans (late 10th–mid-13th Century).” The primary focus of this research was to identify the elements underlying the process of integrating the populations of the newly conquered Balkan territories into Byzantine society and its political, ideological, ecclesiastical, and legal frameworks. This process is commonly referred to as Byzantinization in academic literature. The initial objective of the project was to explore this process within the interior Balkans, starting from the late 10th century when the end of the Bulgarian-Byzantine conflicts resulted in this region being incorporated into the Byzantine Empire, thereby increasing the visibility of Byzantine influences. Recognizing that Byzantium leveraged the Christianization of an ethnic group to achieve longterm influence across all spheres of social development among the evangelized people, the research also examined the preceding period, when the territory under discussion was within the First Bulgarian Empire. Stretching the timeframe was essential for comprehensively assessing the significance of the Archbishopric of Ohrid, which undoubtedly served as the cornerstone of integration in the new provinces of the Balkans in the post-1018 period.We dedicate this book to our esteemed professor Ljubomir Maksimović with heartfelt thanks for his unwavering support to successive generations of researchers at the Institute for Byzantine Studies of the Serbian Academy of Sciences and Arts