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Triggers, prodrome, aura, and headache interactions in migraine with typical aura: a prospective deep-phenotyping study

2026-02-24T00:00:00Z

Title: Triggers, prodrome, aura, and headache interactions in migraine with typical aura: a prospective deep-phenotyping study Authors: Mavija, Srdjan; Radojičić, Aleksandra; Petrušić, Igor Abstract: This study aimed to prospectively and comprehensively phenotype migraine with typical aura (MwA) attacks, with a particular focus on the interaction between trigger factors and clinical features of the prodrome, aura, and headache phases. A secondary aim was to examine how characteristics of individual phases influence the subsequent course of an attack and to provide data-driven hypotheses relevant for future MwA classification.

HER and OER Activity of Ti4O7@Ti Mesh—Fundamentals Behind Environmental Application

2026-02-01T00:00:00Z

Title: HER and OER Activity of Ti4O7@Ti Mesh—Fundamentals Behind Environmental Application Authors: Ranković, Maja; Rakočević, Lazar; Jevremović, Anka; Nedić Vasiljević, Bojana; Janošević Ležaić, Aleksandra; Bajuk-Bogdanović, Danica; Milojević-Rakić, Maja; Gavrilov, Nemanja Abstract: Titanium suboxide (TSO) catalysts offer remarkable activity toward pollutant degradation due to their stability at positive potentials, which enables the formation of reactive oxygen species. Herein, TSOs are prepared directly on the surface of Ti mesh, which also serves as the current collector. The evolution of different TSO surface species during temperature treatment is monitored using micro-Raman spectroscopy. The electrochemically active surface area is determined using cyclic voltammetry (CV) and shows a decrease from 9.3 cm² to 1.1 cm² upon increasing temperature, corresponding to the transformation of TSO as seen in micro-Raman spectroscopy. Impedance spectroscopy revealed nearly identical values (≈29 Ohm) for the charge transfer resistance during OER, indicating the presence of the same active centers on the surface. The electrode potential window toward water splitting is examined using oxygen and hydrogen evolution reactions (OER and HER). The Tafel slopes are in the range 400–600 mV dec⁻¹ for OER and 340–440 mV dec⁻¹ for HER, with higher values being desirable in pollutant degradation applications. Onset potential shifted to slightly more negative values with increasing temperature treatment, with samples treated at 850 °C and 950 °C enabling almost tenfold higher currents at the same potential values. The hydrogen evolution potential lies within the optimal region for H* radical formation around −1.2 V vs. RHE. Surface-formed TSOs represent promising biofunctional materials for pollutant degradation.

Crystallographic, spectroscopic, quantum-chemical, and Z scan analysis of an optically active NLO material (E)-N’-(4-methylbenzylidene)picolinohydrazide

2026-03-04T00:00:00Z

Title: Crystallographic, spectroscopic, quantum-chemical, and Z scan analysis of an optically active NLO material (E)-N’-(4-methylbenzylidene)picolinohydrazide Authors: D. Ramarajan; Dimić, Dušan; S. Sudha

Transferable calibration coefficients for semi-quantitative analysis by Laser Induced Breakdown Spectroscopy (LIBS) in samples containing calcium

2026-03-01T00:00:00Z

Title: Transferable calibration coefficients for semi-quantitative analysis by Laser Induced Breakdown Spectroscopy (LIBS) in samples containing calcium Authors: Lazic, V.; Marković, Milica; Stankov, B. D.; Andreoli, F.; Ulrich, C.; Kuzmanović, Miroslav Abstract: This work establishes a framework for testing and developing calibration coefficients for multi-elemental analysis by LIBS, that are transferrable to various instruments under specific experimental conditions: measurements in air, full optical collection of the plasma plume, apparent plasma temperature and electron density within 6500–7500 K and 1–2 × 10¹⁷ cm⁻³, respectively. Here, the plasma was produced by ns laser pulses at 1064 nm, with energy of 30 mJ while for its detection we used high resolution compact spectrometers. Calibration coefficients for 14 elements were derived respect to one Ca I line (443.50 nm) considering that Ca is a common element in natural samples. The calibration coefficients were obtained from: (i) extrapolated linear peak growths, produced by changing the sample mass on a solid support (Si wafer or Al); (ii) peaks normalized on the Ca line. Their validity interval is specified while the inherent variations with the element abundance and plasma parameters are explained. The initial calibration involved nine different samples, including a multi-element standard, rock, soils ash, coal, and carbonate's mixture, while the validation was applied on two soil samples, both in form of particles on wafer and pressed into pellets. Calibration coefficients based on the linear slope produced quantification of 13 elements within accuracy of ±30% while the use of the line ratios increased the error for some considered elements. To facilitate transfer of the coefficients to other experiments, we provide practical instructions and limits of applicability. The transition from relative to absolute element concentration measurements is also explained in the text.