Evolution of the Polyphenolic Content of Moravian White Grape Variety Wines of Different Vintages During Storage

Wine is known as a source of bioactive compounds and is one of the alcoholic beverages with the highestphenolic content. There has been growing interest in the composition of wine due to its beneficial propertiesfor human health. This work focuses on biologically active and sensory attributes of white wine and presentsresearch on wine chemical profiles in relation to their geographical origin, varieties and storage. The aimof this study was to investigate the phenolic compound evolution of 35 selected white wine varieties fromthe Moravian region in the Czech Republic. To separate and identify individual phenolic compounds in the wines, the high-performance liquid chromatographic method was used. A spectrophotometric methodwas applied for the determination of total polyphenol and total flavonoid content. This research presentsresults for the total benzoic and cinnamic acid derivatives, flavonols, flavanols and stilbene content ofMoravian white grape varieties. Differences were found in the content of these compounds, and the resultsshow that the phenolic concentrations depend on grape variety and storage time

Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope

Arch filament systems occur in active sunspot groups, where a fibril structure connects areas of opposite magnetic polarity, in contrast to active region filaments that follow the polarity inversion line. We used the GREGOR Infrared Spectrograph (GRIS) to obtain the full Stokes vector in the spectral lines Si I 1082.7 nm, He I 1083.0 nm, and Ca I 1083.9 nm. We focus on the near-infrared calcium line to investigate the photospheric magnetic field and velocities, and use the line core intensities and velocities of the helium line to study the chromospheric plasma. The individual fibrils of the arch filament system connect the sunspot with patches of magnetic polarity opposite to that of the spot. These patches do not necessarily coincide with pores, where the magnetic field is strongest. Instead, areas are preferred not far from the polarity inversion line. These areas exhibit photospheric downflows of moderate velocity, but significantly higher downflows of up to 30 km/s in the chromospheric helium line. Our findings can be explained with new emerging flux where the matter flows downward along the fieldlines of rising flux tubes, in agreement with earlier results.Comment: Proceedings 12th Potsdam Thinkshop to appear in Astronomische Nachrichte

Molecular characterization of Prune dwarf virus cherry isolates from Slovakia shows their substantial variability and reveals recombination events in PDV RNA3

Molecular characterization of Prune dwarf virus cherry isolates from Slovakia shows their substantial variability and reveals recombination events in PDV RNA