1. Comparative metabolic fingerprinting of olive (Olea europaea L.) cultivars under boron foliar fertilisationPaula Žurga, Marija Polić Pasković, Nikola Major, Paula Pongrac, Igor Pasković, 2025, original scientific article Abstract: Olive (Olea europaea L.) cultivars often exhibit genotype-specific responses to micronutrient management. In this study, we investigated the metabolic leaf fingerprinting of three cultivars ‘Rošinjola’, ‘Leccino’, and ‘Istarska bjelica’ at two sampling periods (SP-I = 64 days after treatment (DAT) and SP-II = 118 DAT), following boron foliar fertilisation (+B = 41.62 mM B; −B = 0 mM B) applied 50 days after anthesis. To our knowledge, this is the first study to provide such a detailed evaluation of boron-induced shifts in phenolic metabolism in olive leaves. At harvest (SP-II), all three cultivars showed higher concentrations of total identified phenolic compounds in +B plants compared with the −B controls. Notably, the concentration of verbascoside at harvest was higher in +B plants of ‘Istarska bjelica’ and ‘Leccino’, but not in ‘Rošinjola’. Oleuropein content increased in +B plants at harvest to a level higher than 4870 mg/100 g DW, irrespective of cultivar. Conversely, apigenin-7-glucoside declined from SP-I to SP-II in ‘Leccino’ regardless of treatment, whereas in ‘Istarska bjelica’, this decrease occurred only in control plants, with boron preventing the seasonal decline. These findings confirm the prolonged effect of boron foliar fertilisation on phenolic metabolism in olive leaves and highlight cultivar-specific differences in metabolic responses. Further research is needed to clarify how these metabolic shifts relate to primary plant metabolism and how they influence olive oil quality traits among cultivars grown under Croatian conditions.
Keywords: plant metabolism, olive leaves, oleuropein, Istrian cultivars
Published in DiRROS: 22.12.2025; Views: 6; Downloads: 5
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2. Frequency-domain analysis of voltammetric signals : a framework to augment electrochemical sensing explored through benzenediol detectionAbhilash Krishnamurthy, Kristina Žagar, 2026, original scientific article Abstract: Electrochemical signals are traditionally interpreted in the time domain, where overlapping faradaic and non-faradaic currents, noise, and drift obscure frequency-dependent behaviour. This study introduces a frequency-domain framework that complements time-domain analysis by decomposing voltammetric signals into their harmonic components through Fourier methods. AC voltammetry provides experimental evidence of how increasing excitation frequency progressively suppresses faradaic clarity, while a modified Randles equivalent circuit model explains this response through the interplay of charge-transfer, diffusion, and double-layer charging processes. Fourier series analysis of canonical voltammetric techniques, including linear sweep, cyclic, differential pulse, and square wave voltammetry, shows that waveform geometry uniquely defines harmonic structure. Fast Fourier transform analysis of practical data reveals artefacts introduced by finite sampling, binning, and spectral leakage. These effects highlight the need for conceptual awareness when interpreting experimental spectra. Quantitative spectral descriptors such as the centroid, bandwidth, flatness, and low-frequency power fraction link waveform design directly to faradaic visibility and measurement clarity. Frequency-domain analysis therefore establishes that electrochemical measurement is inherently frequency-structured. By combining experimental data, equivalent circuit modelling and spectral metrics within a single framework, this approach provides a general route to optimise waveform parameters, reduce capacitive interference, and improve interpretability across electrochemical techniques. Viewed more broadly, this perspective reframes the process of the measurement itself, showing that time-domain signals are projections of an underlying spectral reality.
Keywords: frequency domain, spectral decomposition, electrochemical sensors, benzenediols
Published in DiRROS: 22.12.2025; Views: 8; Downloads: 5
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9. Divjad v Sloveniji v zadnjih desetletjih in vpliv sprememb v življenjskem prostoruKatarina Flajšman, Poplas Amanda, Boštjan Pokorny, Tom Levanič, Klemen Jerina, 2025, published scientific conference contribution abstract Keywords: divjad, odstrel, številčnost, habitat, življenjski prostor, okoljski vplivi
Published in DiRROS: 19.12.2025; Views: 75; Downloads: 29
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10. Velikopovršinski, linijski in točkovni posegi: : izkušnje z umeščanjem v prostor ter vplivi na prostoživeče živaliBoštjan Pokorny, 2025, published scientific conference contribution abstract Keywords: divjad, umeščanje v prostor, prostoživeče živali, točkovni posegi, obmejne ograje, avtoceste, dejavnost ljudi
Published in DiRROS: 19.12.2025; Views: 66; Downloads: 32
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