Number of found documents: 7260
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Stanovení rtuti a methylrtuti ve specifických antarktických půdách z okolí uhynulých tuleňů
Zvěřina, O.; Kuta, J.; Coufalík, Pavel; Komárek, J.
2017 - Czech
Tato práce se zabývá stanovením celkové rtuti a methylrtuti ve specifických antarktických půdách, vyskytujících se v okolí uhynulých tuleňů. This work is dealing with the determination of total mercury and methylmercury in specific Antarctic soils, which occur in the surroundings of seal carcasses. Keywords: methylmercury; soil; Antarctica Available at various institutes of the ASCR
Stanovení rtuti a methylrtuti ve specifických antarktických půdách z okolí uhynulých tuleňů

Tato práce se zabývá stanovením celkové rtuti a methylrtuti ve specifických antarktických půdách, vyskytujících se v okolí uhynulých tuleňů....

Zvěřina, O.; Kuta, J.; Coufalík, Pavel; Komárek, J.
Ústav analytické chemie, 2017

Determination of the Rate of Tetraethylammoniumion Transfer across the\nWater/1,2-DCE Interface with Steady-State Voltammetry at a Nano-ITIES
Silver, Barry Richard; Holub, Karel; Mareček, Vladimír
2017 - English
The rate of TEA+ ion transfer across the water/1,2-dichloroethane interface has been\nmeasured using steady-state cyclic voltammetry at a capillary with an orifice of nano-sized\ndimension. It was found that the average rate constant for TEA+ transfer from water to oil and\nfrom oil to water is 0.64 cm/s. The results are repeatable using the same capillary. This value\nis similar to that measured previously using electrochemical impedance spectroscopy and\nfluctuation analysis at the micro-interface. Keywords: Ion transfer kinetics; Tetraethylammonium ion; Nanocapillary Available on request at various institutes of the ASCR
Determination of the Rate of Tetraethylammoniumion Transfer across the\nWater/1,2-DCE Interface with Steady-State Voltammetry at a Nano-ITIES

The rate of TEA+ ion transfer across the water/1,2-dichloroethane interface has been\nmeasured using steady-state cyclic voltammetry at a capillary with an orifice of nano-sized\ndimension. It was ...

Silver, Barry Richard; Holub, Karel; Mareček, Vladimír
Ústav fyzikální chemie J. Heyrovského, 2017

Supported Phospholipid Bilayer at the Conductive Interface
Sokolová, Romana; Kocábová, Jana; Kolivoška, Viliam; Gál, M.
2017 - English
The interactions of ethanol and flavonoid compounds with supported phospholipid bilayer\nwere studied by means of electrochemical methods and scanning probe techniques. The\nstability of a 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) phospholipid bilayer\nsupported on different types of conductive substrate was investigated. The relationship\nbetween the method of lipid deposition and the formation of several types of lipid structures\nincluding vesicles, hemimicelles, patches and single bilayers on the interface is discussed. Keywords: Supported phospholipid bilayer; Ethanol; Atomic force microscopy Available on request at various institutes of the ASCR
Supported Phospholipid Bilayer at the Conductive Interface

The interactions of ethanol and flavonoid compounds with supported phospholipid bilayer\nwere studied by means of electrochemical methods and scanning probe techniques. The\nstability of a ...

Sokolová, Romana; Kocábová, Jana; Kolivoška, Viliam; Gál, M.
Ústav fyzikální chemie J. Heyrovského, 2017

Charge Transport through Molecular Towers Based on Tetraphenylmethane Tripods
Kolivoška, Viliam; Šebera, Jakub; Lindner, M.; Valášek, M.; Mayor, M.; Mészáros, G.; Gasior, Jindřich; Hromadová, Magdaléna
2017 - English
Molecular platforms with multiple anchors were introduced recently to provide robust\ncoupling between molecular electronic components and metallic electrodes. In this work,\ncharge transport in tower-shaped single molecule conductors based on tetraphenylmethane\ntripod possessing three thiol anchors is investigated by scanning tunneling microscopy break\njunction technique. The effect of tripod substitution pattern and number of repeating units in\nmolecule is addressed. The substitution was found to influence conductance value in early\nstages of molecular junction evolution, where tower lays parallel to surface. In late stages, the\ncharge is transported through principal molecular axis and junction breaks thermally in tilted\nconfiguration. Keywords: Charge Transport Through Single Molecules; Break Junction Technique; Molecular Electronics Available on request at various institutes of the ASCR
Charge Transport through Molecular Towers Based on Tetraphenylmethane Tripods

Molecular platforms with multiple anchors were introduced recently to provide robust\ncoupling between molecular electronic components and metallic electrodes. In this work,\ncharge transport in ...

Kolivoška, Viliam; Šebera, Jakub; Lindner, M.; Valášek, M.; Mayor, M.; Mészáros, G.; Gasior, Jindřich; Hromadová, Magdaléna
Ústav fyzikální chemie J. Heyrovského, 2017

Graphite Electrode Modified by Poly(Methylene Blue) and its Electrocatalytic Activity towards Hydrogen Sulfide Oxidation
Zlámalová, Magda; Janda, Pavel; Nesměrák, K.
2017 - English
This research is focused on the electrochemical synthesis and characterization of\npoly(methylene blue) (pMB). Two different carbon-based electrode substrates, basal plane\nhighly oriented pyrolytic graphite (HOPG) and pencil graphite electrode (PGE), have been\nmodified by conductive film of pMB. Electrochemical properties and nanomorphological\nchanges have been investigated by cyclic voltammetry and atomic force microscopy.\nImproved electroactivity of the modified electrodes (PGE/pMB and HOPG/pMB) towards\nsulfhydryl group has been observed and examined modified electrodes were researched for\ntheir possible application in electrochemical sensor for hydrogen sulfide in aqueous solutions. Keywords: Atomic force misroscopy; Cyclic voltammetry; Electropolymerization Available on request at various institutes of the ASCR
Graphite Electrode Modified by Poly(Methylene Blue) and its Electrocatalytic Activity towards Hydrogen Sulfide Oxidation

This research is focused on the electrochemical synthesis and characterization of\npoly(methylene blue) (pMB). Two different carbon-based electrode substrates, basal plane\nhighly oriented pyrolytic ...

Zlámalová, Magda; Janda, Pavel; Nesměrák, K.
Ústav fyzikální chemie J. Heyrovského, 2017

Generování hydridů ve spojení s hmotnostní spektrometrií s indukčně vázaným plazmatem
Matoušek, Tomáš
2017 - Czech
Přehledný text popisující využití techniky generování těkavých hydridů v hmotnostní spektrometrií s indukčně vázaným plazmatem. An overview describing technique of volatile hydride generation in connection with inductively coupled plasma mass spectrometry. Keywords: hydride generation; ICP-MS Available in digital repository of the ASCR
Generování hydridů ve spojení s hmotnostní spektrometrií s indukčně vázaným plazmatem

Přehledný text popisující využití techniky generování těkavých hydridů v hmotnostní spektrometrií s indukčně vázaným plazmatem....

Matoušek, Tomáš
Ústav analytické chemie, 2017

Scale-up and production of various recombinant oxidoreductases
Prell, Aleš; Kujan, Petr; Sobotka, Miroslav; Šafář, Hynek
2017 - English
Development and optimization of pilot cultivations and DSP of recombinant intracellular oxidoreductases in microbial productions for a food industrial use Keywords: enzyme production Available at various institutes of the ASCR
Scale-up and production of various recombinant oxidoreductases

Development and optimization of pilot cultivations and DSP of recombinant intracellular oxidoreductases in microbial productions for a food industrial use

Prell, Aleš; Kujan, Petr; Sobotka, Miroslav; Šafář, Hynek
Mikrobiologický ústav, 2017

Impacts of hydrometeorological extremes in South Moravia based on documentary evidence
Chromá, Kateřina; Dolák, Lukáš; Brázdil, Rudolf; Řezníčková, Ladislava
2017 - English
Hydrometeorological extremes have influenced human lives significantly in the past, just as they continue\nto do today. To analyse these influences in the past, information is needed from before the start of systematic\nmeteorological and hydrological observations. Documentary evidence constitutes a very rich source of\ninformation about past hydrometeorological extremes. This paper focuses on impacts of hydrometeorological\nextremes on agriculture and material property and their socio-economic consequences. It also discusses\nthe potential and limitations of such documentary evidence. Despite documentary evidence’s several\nlimitations (e.g. spatial and temporal uncertainty, uncertainty in the annual distribution of records, in\nthe type of extreme, etc.), it is a promising source of information useful for future studies. Keywords: documentary evidence; hydrometeorological extremes; impacts; South Moravia Available at various institutes of the ASCR
Impacts of hydrometeorological extremes in South Moravia based on documentary evidence

Hydrometeorological extremes have influenced human lives significantly in the past, just as they continue\nto do today. To analyse these influences in the past, information is needed from before the ...

Chromá, Kateřina; Dolák, Lukáš; Brázdil, Rudolf; Řezníčková, Ladislava
Ústav výzkumu globální změny , 2017

Comparison of leaf area index dynamics and radiation use efficiency of C3 crops in the Czech Republic
Tripathi, Abishek; Pohanková, Eva; Trnka, Miroslav; Klem, Karel
2017 - English
Leaf area index (LAI) and radiation use efficiency (RUE) are key parameters for plant growth and productivity.\nBecause of irregularities in weather conditions, accurate estimation of crop production requires\nunderstanding relationships between weather, LAI, RUE, and final production. It is thus important to\nstudy how the LAI dynamics, leaf area duration (LAD), and RUE are related to aboveground biomass production\nfor different crops. In our study, we compared aboveground dry mass production, LAI dynamics,\nRUE, and LAD in three C3 crops (spring barley [SB], winter wheat [WW], and oilseed rape [OSR]) in the\nCzech Republic. LAI was measured on the basis of transmitted photosynthetically active radiation, LAD\nwas calculated by counting the number of days in the growing season, RUE was measured using Beer’s\nlaw, and the aboveground dry mass was estimated at the time of harvest. Results of our study showed high\nbiomass production and RUE in SB while there was highest maximum LAI (LAImax) and LAD in OSR. We\nconcluded that LAI dynamics or LAImax do not fully reflect the crop production and that RUE may be considered\nas a better indicator for aboveground dry mass production. Keywords: leaf area; index dynamics; radiations use efficiency; Czech Republic Available at various institutes of the ASCR
Comparison of leaf area index dynamics and radiation use efficiency of C3 crops in the Czech Republic

Leaf area index (LAI) and radiation use efficiency (RUE) are key parameters for plant growth and productivity.\nBecause of irregularities in weather conditions, accurate estimation of crop production ...

Tripathi, Abishek; Pohanková, Eva; Trnka, Miroslav; Klem, Karel
Ústav výzkumu globální změny , 2017

Stem emissions from poplar hybrids grown in a shortrotation plantation contribute to ecosystem balance of nitrous oxide and methane
Macháčová, Kateřina; Kreuzwieser, J.; Rennenberg, H.
2017 - English
The expansion of short-rotation coppices (SRCs) of fast-growing trees can affect the global balance of greenhouse\ngases (GHGs). These include not only carbon dioxide (CO2) but also methane (CH4) and nitrous oxide\n(N2O), both naturally produced by soil microorganisms. Trees are known to exchange CH4 and N2O with\nthe atmosphere. To date, however, the fluxes of these gases from fast-growing trees have been excluded from\nestimation of the GHGs balance for SRCs. Our objectives were to quantify and scale up CH4 and N2O fluxes\nfrom stems of the fast-growing poplar hybrids Max4 and Monviso at an SRC in southwest Germany. Our\ncase study shows that the stems of both hybrids were sources of N2O and CH4, even though consumption of\nCH4 was also observed. The hybrids did not differ in their exchange capacity. Nitrogen fertilization resulted in\nhigher stem N2O emissions compared to non-fertilized trees. The emissions of N2O and CH4 from stems contributed\nas much as 1.5% and 1.2% of soil N2O emission and soil CH4 uptake, respectively. Keywords: stem emission; poplar hybrids grown; short-rotation plantation; ecosystem balance; nitrous oxide Available at various institutes of the ASCR
Stem emissions from poplar hybrids grown in a shortrotation plantation contribute to ecosystem balance of nitrous oxide and methane

The expansion of short-rotation coppices (SRCs) of fast-growing trees can affect the global balance of greenhouse\ngases (GHGs). These include not only carbon dioxide (CO2) but also methane (CH4) and ...

Macháčová, Kateřina; Kreuzwieser, J.; Rennenberg, H.
Ústav výzkumu globální změny , 2017

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