Yes (132)
No (112)
Number of found documents:
244
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Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry
Vyhnanovský, Jaromír; Yildiz, D.; Musil, Stanislav
2019 - English
Three new sensitizers with a significant positive effect on the photochemical vapor generation of bismuth were described. Cobalt was found to be the most effective and led to a significant enhancement of the signal.
Keywords:
photochemical volatile species generation; bismuth; AAS
Available at various institutes of the ASCR
Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry
Three new sensitizers with a significant positive effect on the photochemical vapor generation of bismuth were described. Cobalt was found to be the most effective and led to a significant enhancement ...
Metals in atmospheric particulate matter
Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
2019 - English
Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals have strong potential to be adsorbed on particulate matter and than enter the human body through inhalation causing several health issue (asthma, lung cancer).
Keywords:
aerosol; metals
Available at various institutes of the ASCR
Metals in atmospheric particulate matter
Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals ...
Atomization of bismuthane in two flame atomizers for atomic fluorescence spectrometry
Štádlerová, Barbora; Kolrosová, Marta; Dědina, Jiří; Musil, Stanislav
2019 - English
Atomization of bismuthane in the minature diffusion flame and the flame-in-gas-shield atomizer by hydride generation coupled with atomic fluorescence spectrometry.
Keywords:
atomic fluorescence spectrometry; bismuth; hydride generation
Available at various institutes of the ASCR
Atomization of bismuthane in two flame atomizers for atomic fluorescence spectrometry
Atomization of bismuthane in the minature diffusion flame and the flame-in-gas-shield atomizer by hydride generation coupled with atomic fluorescence spectrometry.
Optimization of photochemical vapor generation of nickel with ICP-MS detection
Šoukal, Jakub; Musil, Stanislav
2019 - English
Photochemical vapor generation of Ni has been investigated in detail using ICP-MS as the detector.
Keywords:
photochemical vapor generation; nickel; ICP-MS
Available in digital repository of the ASCR
Optimization of photochemical vapor generation of nickel with ICP-MS detection
Photochemical vapor generation of Ni has been investigated in detail using ICP-MS as the detector.
On-line simultaneous determination of ammonia/ammonium in ambient air
Čapka, Lukáš; Mikuška, Pavel
2019 - English
Presented paper describes methods for on-line determination of gaseous ammonia and particulate ammonium in ambient air.
Keywords:
ammonia; ammonium; CGU-ACTJU sampler
Available in digital repository of the ASCR
On-line simultaneous determination of ammonia/ammonium in ambient air
Presented paper describes methods for on-line determination of gaseous ammonia and particulate ammonium in ambient air.
LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)
Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
2019 - English
In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles containing rare-earth elements (Y, Yb, and Er). The total content of rare earths and their bioaccumulation factors were determined in the root, hypocotyl, and leaves of R. sativus after 72 hours, and in L. minor fronds after 168 hours. In R. sativus, translocation factors were determined as the ratio of rare earths content in hypocotyl versus roots and in leaves versus hypocotyl. The lengths of the root and hypocotyl in R. sativus, as well as the frond area in L. minor were monitored as toxicity end points. To distinguish rare-earth bioaccumulation patterns, two-dimensional maps of elemental distribution in the whole R. sativus plant and in L. minor fronds were obtained by using laser-induced breakdown spectroscopy with a lateral resolution of 100 μm. Obtained results revealed that the tested nanoparticles became adsorbed on L. minor fronds and R. sativus roots, and got transferred from roots through the hypocotyl into leaves in R. sativus. Our results show that bioaccumulation patterns and spatial distribution of rare earths in nanoparticle-treated plants differ from those of positive control (the mixture of YCl3, YbCl3, and ErCl3).
Keywords:
photonupconversion nanoparticles; luminescent nanomaterials; bioaccumulation
Available in digital repository of the ASCR
LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)
In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles ...
Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment
Týčová, Anna; Přikryl, Jan; Vaňhara, P.; Klepárník, Karel; Foret, František
2019 - English
Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the potential\nof Raman spectrometry for a definite identification of an analyte with remarkable sensitivity achieved by the surface enhancement effect occurring on metal nanoparticles. While low ionic strength influences positively\nthe sensitivity of the SERS measurement, a higher level of inorganic salts leads to fast ruining of colloidal character, which completely devastates the effect of the surface enhancement. The common stabilization of\nnanoparticles by a layer of polymers has a negative impact on the SERS sensitivity since it shields the nanoparticle surface from the analytes. In this work, we aim at the development of the bi-ligand system of\nnanoparticles surface modification for improved stability of colloid in saline solution at sustaining the potential for sensitive SERS analyses. The proposed system relies on the binding of 3-mercaptopropionic acid and\nthiolated polyethylene glycol in a suitable ratio onto the nanoparticle surfaces. While the short chains of the acid sustain the accessibility of the surface for analytes, the polymeric structures act as a steric barrier\npreventing colloid aggregation.
Keywords:
bi-ligand; nanoparticle; saline solution; surface-enhanced Raman spectrometry
Available on request at various institutes of the ASCR
Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment
Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the ...
Microfluidic device for cell counting and electrical lysis
Václavek, Tomáš; Křenková, Jana; Foret, František
2018 - English
This lecture presents two microfluidic devices as essential units for single cell proteomic analysis, firstly a device for cell counting based on resistive pulse sensing as an alternative to optical platforms based on visual control over the sample input, secondly a unit for electrical lysis of cells using direct current voltage pulses to lyse cells one by one with a possibility to analyze the distinct lysate zones by electrospray ionization mass spectrometry.
Keywords:
microfluidic devices; microextraction of basic drugs; single cell proteomic analysis; electrospray ionization mass spectrometry; cell lysis
Fulltext is available at external website.
Microfluidic device for cell counting and electrical lysis
This lecture presents two microfluidic devices as essential units for single cell proteomic analysis, firstly a device for cell counting based on resistive pulse sensing as an alternative to optical ...
Impact of post-harvest processing, geographical locality and production year on quality of selected medicinal plants
Burdějová, Lenka; Polovka, M.; Pořízka, J.
2018 - English
This study deals with the assessment of the impact of post-harvest treatment, geographical location and production years on 32 selected characteristics of medicinal plants grown in the Czech Republic. Dimethyl sulfoxide herbal extracts characteristics were evaluated by spectroscopic and chromatographic techniques. The results were processed by analysis of variance and multivariate statistical tools. Obtained results clearly proved the successful differentiation of herbal samples by means of canonical discrimination analysis according to post-harvest treatment (100%), geographical origin (82.9%) and production year (96.1%) confirming that studied factors may have significant effect on quality of medicinal plants.
Keywords:
HPLC-DAD; ICP-OES; plants extracts; herbal extracts
Fulltext is available at external website.
Impact of post-harvest processing, geographical locality and production year on quality of selected medicinal plants
This study deals with the assessment of the impact of post-harvest treatment, geographical location and production years on 32 selected characteristics of medicinal plants grown in the Czech Republic. ...
A Validatation of non-invasive method for diagnostic of cystic fibrosis based on ion ratios determined by CE-C4D
Ďurč, P.; Lačná, J.; Dosedělová, V.; Foret, František; Homoľa, L.; Pokojová, E.; Malá, M.; Skřičková, J.; Dastych, M.; Vinohradská, H.; Dřevínek, P.; Skalická, V.; Kubáň, Petr
2018 - English
A validation of novel approach for diagnosis of cystic fibrosis (CF) is presented. The method is very simple and fast, since for collection of samples, only wiping of the skin of forearm is needed. The collected sample is analyzed by capillary electrophoresis with contactless conductometric detection (CE-C4D). Ion ratios are determined as ratios of peak area of chloride anion and peak areas of selected cations. It is possible to distinguish between cystic fibrosis patients and healthy individuals when ion ratio is applied as diagnostic factor. In here, we present analytical parameters of developed method (limits of detection, limits of quantification, repeatability of migration times, repeatability of peak areas) and ROC curve, which reveals high sensitivity and specificity of the developed method.
Keywords:
method for diagnostic of cystic fibrosis; cystic fibrosis; capillary electrophoresis with contactless conductometric detection
Fulltext is available at external website.
A Validatation of non-invasive method for diagnostic of cystic fibrosis based on ion ratios determined by CE-C4D
A validation of novel approach for diagnosis of cystic fibrosis (CF) is presented. The method is very simple and fast, since for collection of samples, only wiping of the skin of forearm is needed. ...
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