Faculty of Natural Sciences and Mathematics

Permanent URI for this communityhttps://repository.ukim.mk/handle/20.500.12188/16

Browse

Search Results

Now showing 1 - 10 of 185

Some of the metrics are blocked by your
consent settings
Mechanotransduction-Driven Modulation of L-Type Calcium Channels: Roles of Nitric Oxide, S-Nitrosylation, and cGMP in Rat Ventricular Cardiomyocytes
(MDPI AG, 2025-08-04)
Kamkina, Olga V.
;
Rodina, Anastasia S.
;
Kamkin, Andre
;
Bilichenko, Andrei S.
;
Kazansky, Viktor E.
Some of the metrics are blocked by your
consent settings
Semi-Quantitative Characterization of Volatile Organic Compounds in Indoor and Outdoor Air Using Passive Samplers: A Case Study of Milan, Italy
(MDPI AG, 2025-09-16)
Mula, Vllaznim
;
;
;
Zeneli, Lulzim
;
Mehmeti, Valbonë
This study presents a semi-quantitative characterization of volatile organic compound (VOC) concentrations and their emission sources in indoor and outdoor environments across four residential and laboratory sites in Milan, Italy, during the summer of 2024. Radiello® passive samplers (Fondazione Salvatore Maugeri in Padova, Italy) were employed for VOC collection, followed by gas chromatography–mass spectrometry analysis. The semi-quantitative mean total VOC (TVOC) concentration was 220.8 ± 195.4 µg/m3 for the outdoor air and slightly higher at 243.6 ± 134.3 µg/m3 for the indoor air, resulting in an indoor-to-outdoor relative ratio of 1.10. The outdoor VOC profile was dominated by hydrocarbons, accounting for 80.3% ± 4.6% (173.2 ± 143.8 µg/m3) of TVOCs, followed by aromatic hydrocarbons at 13.3% ± 5.5% (37.2 ± 49.7 µg/m3). Indoors, hydrocarbons also predominated, representing 34.1% ± 15.2% (95.2 ± 80.1 µg/m3) of the TVOCs, followed by terpenes at 20.7% ± 15.5% (49.0 ± 46.4 µg/m3). Other VOC groups contributed smaller fractions in both environments. The emission profiles from cleaning and personal care products were assessed semi-quantitatively to determine their relative percentage contributions to the indoor VOCs. Source attribution was further supported by diagnostic relative ratios—benzene/toluene, toluene/benzene, and (m + p)-xylene/ethylbenzene—which provided insight into dominant emission sources and photochemical aging.
Some of the metrics are blocked by your
consent settings
Questionnaire improvements in second-generation, multilingual decision support tools for invasion risk screening of non-native taxa
(Regional Euro-Asian Biological Invasions Centre Oy (REABIC), 2025)
Vilizzi, Lorenzo
;
Piria, Marina
;
Herczeg, Gábor
;
Almeida, David
;
Al-Wazzan, Zainab
Some of the metrics are blocked by your
consent settings
Conceptual design of sandwich walls for shielding against secondary neutrons using MC simulations with FLUKA
(Elsevier, 2024-12)
Redona Bexheti, Mimoza Ristova
Some of the metrics are blocked by your
consent settings
Solid-State Phase Transformation of Monohydrate and Anhydrous Form II of Sitagliptin Phosphate into a Novel Anhydrous Form IV – Solvent-Driven, Temperature-Induced and Stress Testings
(Elsevier BV, 2024-02)
Chachorovska, Marina
;
Lefton, Jonathan B.
;
Petrushevski, Gjorgji
;
Geskovski, Nikola
;
Some of the metrics are blocked by your
consent settings
Innovative Learning Activities for Ethnically Diverse Students in Macedonian Science Education
(University of Ljubljana, 2024-03-29)
;
;
Petruševski, Vladimir
;
Naumoska, Aleksandra
;
Tofilovska, Slavica
<jats:p>A game-based approach is widely used to increase students’ motivation through their active participation, whereby research is interwoven with fun and competition is incorporated with cooperation. Working in teams or groups encourages students to exchange their opinions, to try to find solutions together or to win a game. In this way, they learn and improve skills such as collaboration and responsibility. Several activities involving the 5E model as part of inquiry-based science education and an escaperoom as part of game-based learning were used in science classes (chemistry, biology and physics). The activities were designed on three different topics – gases, ecology and electrical circuits – within the project “Diversity in Science towards Social Inclusion – Non-formal Education in Science for Students’ Diversity”. The activities focused on the students’ self-concept towards science, interest in the subject, motivation and careeraspirations in STEM, as well as the effectiveness of the implemented activities. The study aimed to assess the potential advantages of implementing activities in an ethnically diverse environment, benefiting both students and teachers. Pre- and post-questionnaires were designed and distributed to 190 students from various primary and secondary schools in Macedonia. The present paper provides an overview of game-based activities as well as a brief analysis of the pre- and post-questionnaire responses fromstudents, focusing on the topic of ecology.</jats:p>
Some of the metrics are blocked by your
consent settings
Unveiling Torrential Flood Dynamics: A Comprehensive Study of Spatio-Temporal Patterns in the Šumadija Region, Serbia
(MDPI AG, 2024-03-29)
Petrović, Ana M.
;
Leščešen, Igor
;
<jats:p>This paper presents a comprehensive analysis of flood frequency and a spatio-temporal characterization of historical torrential floods in the Šumadija region using water discharge datasets and documented events. A chronology of 344 recorded torrential flood events, spanning from 1929 to 2020, illustrates the region’s vulnerability, with a death toll exceeding 43. The study defines the intra-annual primary and secondary peaks of torrential flood occurrences and explains their spatial distribution. Furthermore, the identification of suitable probability distribution functions underscores the necessity of tailored approaches for effective flood risk management in this diverse geographical environment. The study employed Flood Frequency Analysis (FFA) and goodness-of-fit tests, including the Kolmogorov–Smirnov (K-S) and Cramér–von Mises (CvM) tests, to assess the frequency and magnitude of flood events and evaluate diverse distribution functions. The main results include the identification of suitable probability distribution functions for each river within the region, emphasizing the need for tailored approaches in flood risk management. Additionally, discharge values for various return periods offer crucial insights for informed decision-making in flood risk management and infrastructure planning.</jats:p>
Some of the metrics are blocked by your
consent settings
Characteristics of annual and seasonal precipitation in North Macedonia: change analysis and correlation with the North Atlantic Oscillation (1951–2010)
(Idojaras, 2024)
;
Hall, Julia
;
;
Arse Kuzmanoski, Ana M. Petrović
;
Manevska, Emilija
<jats:p>Studying the spatiotemporal precipitation characteristics in North Macedonia (1951–2010) is important as no spatially concurrent precipitation changes across the Balkan Peninsula have been identified. North Macedonia lies at the intersection between Mediterranean and continental climate zones and an improved understanding might help to better understand the regional precipitation patterns. The analysis shows a spatially consistent, high inter-annual variability, which makes trend detection difficult. Statistically significant decreasing trends were only found in seasonal precipitation at three stations. Changes in all other precipitation series were non-significant. Trends in winter, spring, and at annual scale are generally decreasing, whereas in summer are increasing. To better understand possible mechanisms behind the observed variability and change, correlations with the North Atlantic Ocsillation (NAO) were assessed. Significant and regionally concurrent correlations were detected. A strong correlation of the previous winter NAO-index with spring precipitation was found, which is valuable information for anticipatory water resources management in the region.</jats:p>
Some of the metrics are blocked by your
consent settings
Topological transitivity of algebraically recurrent sets
(Academy of Sciences and Arts of Bosnia and Herzegovina, 2024)
Shoptrajanov, Martin
In this paper we will discuss the connection between topological transitivity and recurrence of G-flows acting on a compact metric space X. We will prove that the T T -property of the set of all algebraically recurrent points AR(ϕ) implies chain recurrent properties of the whole space and hence improve some of the results from [6].
Some of the metrics are blocked by your
consent settings
Exploiting the Electrical Nature of Biofilms for Long-Term Monitoring of Quiescent Aquatic Environments via Open-Circuit Microbial Potentiometric Sensors: Evidence of Long-Distance Electrical Signaling
(Nano LIFE, 2023)
Burge, Scott R.; Hristovski, Kiril D.; Burge, Russell G.; Pejov, Ljupco; Boscovic, Dragan; Taylor, Evan; Hoffman, David A.
This study was based on the hypothesis that spatial–temporal characterization of contaminant- affected redox gradients in a quiescent system could be measured by microbial potentiometric sensor (MPS) arrays incorporated in large, natural biofilm networks. Two experimental chambers, each containing at least 48 equidistantly located MPS electrodes, were fabricated to examine reproducibility of the patterns. The MPS electrodes were exposed to biofilm growth conditions by introducing high dissolved organic carbon (DOC) and dechlorinated tap water at the bottom of the experimental chamber; and the spatial–temporal changes in the MPS array signals were recorded, which showed that signal trends were correlated to the induced changes in DOC. The results indicated that MPS arrays measured the spatial–temporal changes in the aqueous solution caused by an influx of carbon rich water, which could not be detected by conventional oxidation-reduction potential (ORP) electrodes. Interestingly, the experiments conducted over long time periods revealed unusual behaviors like electrical signaling and possible potentiometrically driven communication within the biofilm. These observed behaviors suggest that biofilms may create a large network through which communication signals can be generated and propagated by inducing changes in electric potentials similar to a sophisticated electronic device.

Faculty of Natural Sciences and Mathematics

Browse

Filters

Settings

Sort By

Results per page

Search Results