A5020840844- Electrochemical Analysis and Applications
- Ancient and Medieval Archaeology Studies
- Nonlinear Dynamics and Pattern Formation
- Spectroscopy and Quantum Chemical Studies
- Maritime and Coastal Archaeology
- Membrane-based Ion Separation Techniques
- Ion channel regulation and function
- Cardiac electrophysiology and arrhythmias
- Fuel Cells and Related Materials
- Ancient Mediterranean Archaeology and History
- Neuroscience and Neuropharmacology Research
- Sulfur Compounds in Biology
- Electron Spin Resonance Studies
- Chemical Reaction Mechanisms
- Oxidative Organic Chemistry Reactions
- Ionic liquids properties and applications
- Marine and environmental studies
- Free Radicals and Antioxidants
- Inorganic and Organometallic Chemistry
- Spider Taxonomy and Behavior Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Mining Techniques and Economics
- Analytical Chemistry and Chromatography
- Global Trade and Competitiveness
- Chemical and Physical Properties in Aqueous Solutions
Comenius University Bratislava
2011-2023
National Museum of Slovenia
2016-2017
University of Zagreb
2017
Slovak Academy of Sciences
2010-2015
Brandeis University
2011
Sisters of Charity Hospital
1996
Abstract Stopped-flow mixing device and visible absorption spectroscopy were used for the analysis of dye rhodamine 6G (R6G) molecular aggregation in colloids based on Na-saturated montmorillonite. Two stages reaction identified: The first stage was very short taking only several seconds, involving adsorption R6G cations their initial surface colloid particles. initially formed J-aggregates exhibited similar spectral properties as monomeric form R6G. In second stage, aggregates converted to...
Cytosolic calcium concentration in resting cardiac myocytes locally fluctuates as a result of spontaneous microscopic Ca2+ releases or abruptly rises an external trigger. These processes, observed sparks, are fundamental for proper function muscle. In this study, we analyze how the characteristics and triggered sparks related to ryanodine receptor (RYR) gating. We show that frequency probability distribution release flux quanta correspond quantitatively predictions allosteric homotetrameric...
We use the photosensitive chlorine dioxide–iodine–malonic acid reaction–diffusion system to study wavenumber locking of Turing patterns with spatial periodic forcing. Wavenumber-locked stripe are typical resonant structures that labyrinthine exhibit in response one-dimensional forcing by illumination when images stripes projected on a working medium. Our experimental results reveal segmented oblique, hexagonal and rectangular can also be obtained. However, these two-dimensional only develop...
The role of cardiac ryanodine receptor (RyR) gating in the initiation and propagation calcium waves was investigated using a mathematical model comprising stochastic description RyR deterministic diffusion sequestration. We used one-dimensional array equidistantly spaced clusters, representing confocal scanning line, to simulate formation sparks. Our provided an excellent dependence frequency diastolic sparks increased tendency for production after decrease cytosolic buffering. developed...
The effect of the iodine interphase transport originated from physical processes, such as pressure decrease, vigorous stirring, and/or an inert gas bubbling, on dynamics oscillating Bray−Liebhafsky reaction is studied. Some new experiments were made at 60 °C that confirmed possibility suppressing oscillations by means vapor removal solution. It has been proved vaporization governed first-order kinetics with respect to concentration aqueous iodine, and a critical rate constant for escape...
We employ numerical techniques for solving time-dependent full Poisson-Nernst-Planck (PNP) equations in 2D to analyze transient behavior of a simple ion channel subject sudden electric potential jump across the membrane (voltage clamp). Calculated spatiotemporal profiles ionic concentrations and show that two principal exponential processes can be distinguished electrodiffusion kinetics, agreement with original Planck's predictions. The initial fast process corresponds dielectric relaxation,...
We studied the kinetics of reaction N-acetyl-l-cysteine (NAC or RSH) with cupric ions at an equimolar ratio reactants in aqueous acid solution (pH 1.4−2) using UV/Vis absorption and circular dichroism (CD) spectroscopies. Cu2+ showed a strong catalytic effect on 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) radical (ABTSr) consumption autoxidation NAC. Difference spectra revealed formation intermediates maxima 233 302 nm (ε302/Cu > 8 × 103 M−1 cm−1) two positive Cotton effects centered...
The bromate–aniline oscillatory reaction was discovered 4 decades ago, but neither the detailed mechanism nor key products or intermediates of were described. We report herein a study this reaction, which yielded new insights. found that oxidation aniline by acidic bromate proceeds, to significant extent, via novel pathway with periodic release carbon dioxide. Several isolated, and their structures, not described so far, justified on basis MS NMR. One main associated CO2 route can be...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIrregular Oscillations in a Bromate-Thiocyanate Batch System under Constant Nitrogen Gas FlowIvan Valent and L'ubica AdamcikovaCite this: J. Phys. Chem. 1994, 98, 16, 4304–4306Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994https://pubs.acs.org/doi/10.1021/j100067a015https://doi.org/10.1021/j100067a015research-articleACS PublicationsRequest reuse permissionsArticle...
La campagne 2016 du programme de recherche sur les sites ecclesiaux et monastiques l’archipel Kvarner a essentiellement porte la fouille petit complexe antique medieval septentrional site Mirine-Fulfinum – secteur dit « l’eglise trois absides » (ile Krk), 11 au 23 avril 2016, poursuite grande eglise paleochretienne Martinscica Cres) 27 juin 14 juillet (fig. 1). Fig. 1 Carte Kvarner...
Abstract Complex dynamical behavior has been observed in the oxidation of hydroxylamine by bromate acidic sulfate medium. The reaction shows clock type kinetics closed conditions and an aperiodic oscillations if gaseous products are removed from system with a constant flow‐rate. reduction ions excess studied presence allyl alcohol. pseudo‐first‐order rate k obs found to follow expression where [hydroxylamine] is total initial concentration, K 1 = 0.5 M −1 , 2 10 6 2.57 × 3 s at 298.15 I 2.0...