Chalcogenide glasses and films Ga5Sb10Ge20S65:0.1Ho0.1Er with intense luminescence in IR spectral region

Rare-earth elements doped chalcogenide glasses and films, promising materials for optoelectronics, photovoltaics or information technologies, were studied in order to determine their physical and optical properties, especially photoluminescence. In our work we focused on Er and Ho doped chalcogenides of stoichiometry 99,8(Ga5Sb10Ge20S65)0.1Ho0.1Er. We synthetized bulk glass and thin films and characterized it with various methods. In the case of thin …

Biological activity of essential oils and extracts from narrow-leaved lavender (Lavandula angustifolia Mill.) flower

The main objective of this study was to compare the chemical composition and antiproliferative effect of extracts and essential oils from three narrow-leaved lavender (Lavandula angustifolia Mill.) cultivars. Essential oil composition were compared and the drug concentration providing the highest yield of extract was determined. The obtained lavender extracts and essential oils were in vitro tested in HeLa, MCF7, CCRF-CEM …

Subvolcanic intrusions in South Bohemia

Field, microscopic and analytical research of obsidian and porphyric intrusions in the South Bohemian moldanubicum allows the merging of the two occurrences into an identical volcanic event. Amongst the observed minerals in thin sections was highly deformed biotite, both potassium and sodium-calcium feldspar, spherolitic orthoclase, quartz grains, sagenite, amphibole and apatite. The chemistry of the samples proves that they were …