Ano (207)
Počet nalezených dokumentů:
207
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Novel photochemical vapor generation of rhenium for its ultratrace determination
Vyhnanovský, Jaromír; Hašlová, K.; Musil, Stanislav
2021 - anglický
The presentation focused on novel photochemical vapor generation of rhenium. Details on optimization of generation conditions and other important parameters regarding this sensitive methodology, as well as its possible applications were pointed out and discussed.
Klíčová slova:
photochemical vapor generation; inductively coupled plasma mass spectrometry; rhenium
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Novel photochemical vapor generation of rhenium for its ultratrace determination
The presentation focused on novel photochemical vapor generation of rhenium. Details on optimization of generation conditions and other important parameters regarding this sensitive methodology, as ...
Nanospray processing of silver nanoparticles for formation of dried deposits
Týčová, Anna; Jonas, Vladimír; Přikryl, Jan; Kotzianová, A.; Velebný, V.; Foret, František
2021 - anglický
Nanospray transfers liquid into an aerosol via electrostatic forces created between an emitter and a counter electrode. Herein, we present compact laboratory-made instrumentation for nanospray-processing of silver colloid. The instrumentation is based on the pressurized polysulfone chamber fixing a disposable vial with an immersed platinum electrode and a long fused silica capillary supplying the sprayed liquid to the emitter. The combination of low flow rates (70 nL/min) with a sharp emitter, fabricated on a 3D printed grinding station, resulted in a fine aerosol. The low volume of released droplets allowed full evaporation of water during their flight towards the counter electrode without any need for drying gas or the addition of volatile solvents. The constructed device was successfully used for the deposition of water-free silver colloid without any requirement of its pretreatment. The deposition of completely dried nanoparticles on planar substrates eliminated undesirable coffee ring effect and deposits of increased homogeneity could be obtained. Electron microscopy confirmed no significant changes in the character of nanospray-processed nanoparticles. Finally, we also investigated several approaches for the improvement of the surface density of nanoparticles on the substrate at preserved time scale.
Klíčová slova:
nanoparticles; nanospray; silver
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Nanospray processing of silver nanoparticles for formation of dried deposits
Nanospray transfers liquid into an aerosol via electrostatic forces created between an emitter and a counter electrode. Herein, we present compact laboratory-made instrumentation for ...
Optimization of photochemical vapor generation of tellurium for analytical atomic spectrometry
Jeníková, Eva; Musil, Stanislav; Hraníček, J.
2021 - anglický
Photochemical vapor generation of tellurium was studied using a miniature diffusion flame atomizer and high-resolution continuum source atomic absorption spectrometry.
Klíčová slova:
tellurium photochemical vapor generation; atomic absorption spectrometry
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Optimization of photochemical vapor generation of tellurium for analytical atomic spectrometry
Photochemical vapor generation of tellurium was studied using a miniature diffusion flame atomizer and high-resolution continuum source atomic absorption spectrometry.
Comparison of radiation sources for atomic fluorescence spectrometry
Štádlerová, Barbora; Dědina, Jiří; Musil, Stanislav
2021 - anglický
Comparison of a bismuth boost-discharge hollow cathode lamp and and electrodeless discharge lamp employed as an excitation source in an atomic fluorescence spectrometer.
Klíčová slova:
atomic fluorescence spectrometry; bismuth; hydride generation
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Comparison of radiation sources for atomic fluorescence spectrometry
Comparison of a bismuth boost-discharge hollow cathode lamp and and electrodeless discharge lamp employed as an excitation source in an atomic fluorescence spectrometer.
The effect of milk thistle cultivation technology [Silybum marianum (L.) Gaertner] on the yield and contained compounds
Fojtíková, L.; Bradáčová, M.; Kudláčková, Barbora; Bjelková, M.; Pluháčková, H.
2021 - anglický
The aim of the present study was to evaluate the impact of complex growing technology on the quality of milk thistle achenes.
Klíčová slova:
milk thistle; cultivation technology; silymarin complex
Dokument je dostupný na externích webových stránkách.
The effect of milk thistle cultivation technology [Silybum marianum (L.) Gaertner] on the yield and contained compounds
The aim of the present study was to evaluate the impact of complex growing technology on the quality of milk thistle achenes.
Chemical vapor generation of cadmium: detector comparison
Sagapova, Linda; Štádlerová, Barbora; Svoboda, Milan; Kratzer, Jan; Musil, Stanislav
2021 - anglický
A chemical vapor generation system was connected to an in-house assembled atomic fluorescence spectrometer (AFS) equipped with a miniature diffusion flame atomizer in order to assess its potential to Cd determination. Subsequently, analytical performance of three spectrometric detectors was compared (AAS, AFS, ICP-MS) with respect to Cd determination after volatile species generation.
Klíčová slova:
chemical vapor generation; cadmium; atomic fluorescence spectrometry
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Chemical vapor generation of cadmium: detector comparison
A chemical vapor generation system was connected to an in-house assembled atomic fluorescence spectrometer (AFS) equipped with a miniature diffusion flame atomizer in order to assess its potential to ...
Bioluminescence determination of caspase-3/7 in single osteosarcoma cells
Killinger, Michael; Matalová, Eva; Klepárník, Karel
2021 - anglický
The protein heterogeneity at the single-cell level has been recognized to be vital for an understanding of various life processes during animal development. In addition, the knowledge of accurate quantity of relevant proteins at cellular level is essential for appropriate interpretation of diagnostic and therapeutic results. Here, we determined the level of active caspase-3/7 in physiological and pathological (cancer) conditions by our miniaturized instrumentation.
Klíčová slova:
single-cell analysis; osteoblast; osteosarcoma
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Bioluminescence determination of caspase-3/7 in single osteosarcoma cells
The protein heterogeneity at the single-cell level has been recognized to be vital for an understanding of various life processes during animal development. In addition, the knowledge of accurate ...
Separace VRA/RA ze vzorků pomocí isoelektrické fokusace v čipovém formátu (chip-IEF) pro potřeby kontroly zákazu biologických zbraní
Kubíček, O.; Duša, Filip; Šalplachta, Jiří; Lunerová, K.; Rosenbergová, K.
2021 - anglický
Metodika popisuje způsob separace bakteriálních vysoce rizikových a rizikových agens (VRA/RA) ze vzorků pomocí isoelektrické fokusace v čipovém formátu (chip-IEF). Metoda chip-IEF využívá nově vyvinutý unikátní prototyp zařízení pro vertikální isoelektrickou fokusaci v rozbíhavém toku v čipovém provedení, která na rozdíl od dosavadních postupů umožňuje i separaci bakterií. Separace pomocí chip-IEF funguje i pro šetrně inaktivované bakterie, což významně snižuje bezpečnostní rizika při manipulaci se vzorkem potenciálně obsahujícím VRA/RA.
Klíčová slova:
isoelectric focusing; B-agens; chip
Dokument je dostupný na externích webových stránkách.
Separace VRA/RA ze vzorků pomocí isoelektrické fokusace v čipovém formátu (chip-IEF) pro potřeby kontroly zákazu biologických zbraní
Metodika popisuje způsob separace bakteriálních vysoce rizikových a rizikových agens (VRA/RA) ze vzorků pomocí isoelektrické fokusace v čipovém formátu (chip-IEF). Metoda chip-IEF využívá nově ...
Photochemical vapor generation of cobalt for detection by inductively coupled plasma mass spectrometry
Vyhnanovský, Jaromír; Musil, Stanislav
2020 - anglický
Volatile species of cobalt were generated in a flow-injection system, employing a high-efficiency flow-through UV photoreactor and a formic acid based medium. Optimal generation conditions were found as 10% (v/v) formic acid and 4 mol/L ammonium formate at a flow rate of 4 ml/min.
Klíčová slova:
photochemical vapor generation; cobalt; inductively coupled plasma mass spectrometry
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Photochemical vapor generation of cobalt for detection by inductively coupled plasma mass spectrometry
Volatile species of cobalt were generated in a flow-injection system, employing a high-efficiency flow-through UV photoreactor and a formic acid based medium. Optimal generation conditions were found ...
Fast and highly sensitive laser scanner for recording photon-upconversion luminiscence from planar surfaces
Hlaváček, Antonín; Křivánková, Jana; Foret, František
2020 - anglický
Photon-upconversion nanoparticles (UCNPs) are lanthanide-doped nanocrystals that can be excited by nearinfrared light and emit photon-upconversion luminescence of shorter wavelengths. Advantages of UCNPs include near-infrared excitation, multiple and narrow emission bands, negligible autofluorescence and high stability, which make UCNPs ideal luminescence label for use in biological and chemical assays. These assays - e.g. upconversion-linked immunosorbent assay, western blot, lateral flow assay, gel electrophoresis, thin layer chromatography - commonly require the scanning of a planar surface with a high spatial resolution and an excellent sensitivity. The availability of commercial equipment is recently limited because of the novelty of the photon-upconversion phenomenon. Therefore, we report on the construction of photon-upconversion laser scanner. The scanner consists of a laser scanning head, which is attached to a xy-moving stage. The scanning head itself is constructed as an epiluminescence detector with excitation wavelength of 976 nm. A CCD array spectroscope is connected to the laser head and serves as a sensitive detector of photon-upconversion luminescence. The scanner possesses a spatial resolution of 200 μm, the scanning rate is up to 57 points per second and the sensitivity reaches down to single photon-upconversion nanoparticle.
Klíčová slova:
photon-upconversion; nanoparticle; laser scanner; hyperspectral imaging
Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Fast and highly sensitive laser scanner for recording photon-upconversion luminiscence from planar surfaces
Photon-upconversion nanoparticles (UCNPs) are lanthanide-doped nanocrystals that can be excited by nearinfrared light and emit photon-upconversion luminescence of shorter wavelengths. Advantages of ...
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