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Lubomı́r Čáp

Palacký University Olomouc

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Petr Barták

Palacký University Olomouc

Z. Stránský

Palacký University Olomouc

Milan Kotouček

Palacký University Olomouc

Martin Rulı́k

Palacký University Olomouc

Marek Martínek

Masaryk University

Jiřı́ Grúz

Palacký University Olomouc

Karel Lemr

Palacký University Olomouc

Adam Bednařík

Czech Academy of Sciences, Global Change Research Institute

V. Stužka

Palacký University Olomouc

Eva Hlaváčová

Palacký University Olomouc

Cooperative Institutions

Palacký University Olomouc

Czech Academy of Sciences

Regional Centre of Advanced Technologies and Materials

Charles University

Czech Academy of Sciences, Institute of Experimental Botany

Czech Academy of Sciences, Institute of Microbiology

Czech Academy of Sciences, Global Change Research Institute

Communauté urbaine de Lyon

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

University of Vienna

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Contribution of Methane Benthic and Atmospheric Fluxes of an Experimental Area (Sitka Stream)

CLEAN - Soil Air Water (2015)

Adam Bednařík Lubomı́r Čáp Vítězslav Maier Martin Rulı́k

Contributions of methane benthic fluxes and methane emissions to the total methane amount were studied during the summer season for two consecutive years. Considering the fact that methane is produced in great amount within hyporheic sediments, we have expected that both methane released by the benthic fluxes into the overlying water and methane emitted to the atmosphere should significantly affect the total methane budget of the stream water within the experimental area. In order to asses this assumption, we measured methane concentrations within the vertical sediment profile of a hyporheic zone, direct benthic methane fluxes by static chambers, methane concentrations in the surface water, and methane emissions into the atmosphere simultaneously. The methane concentrations in interstitial water tended sharply to increase with sediment depth (0.54–734.99 μmol L−1) and were strongly correlated with benthic fluxes (r = 0.88, p < 0.05). We also found a considerable variability in the benthic methane fluxes (0–12.59 mmol m−2 day−1) and the spatial variability (0–71.43%) of the experimental area, suggesting that there may be various factors that affect the rate of benthic fluxes including methanotrophy in the top sediment layers. Generally, the contribution of benthic fluxes and methane emissions to the methane budgets of the experimental area was negligible (0.034 (0.45%) and 0.074 mol day−1 (0.98%), respectively).

Atmospheric methane

10.1002/clen.201300982

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Analysis of Markers for Characterization of Distillates

Chemické listy (2007)

M. Korhoňová R. Hejdová Petr Barták Petr Bednář Lubomı́r Čáp

Fruit distillates, such as apricot-brandy, plum vodka “Slivovitz”, cider-brandy and pear-brandy, originating from domestic production, small distilleries and manufacturing production, were analysed by gas chromatography with mass spectrometry. Less specific, but universal markers present in all types of distillates were selected for first experiments: propan-1-ol, propan-2-ol, ethyl acetate, 2-methylpropan-1-ol, 3-methylbutan-1-ol, 2-methylbutan-1-ol, 1,1-diethoxyethane, ethyl octanoate, ethyl decanoate, ethyl dodecanoate, ethyl tetradecanoate, ethyl palmitate and ethyl stearate. Quantitative data were statistically evaluated by factor analysis. Regarding the minute specificity of selected markers, unexpectedly good resolution was observed in this case. The results of factor analysis indicate a possibility of differentiation of products from different fruits. Samples of apricot-brandy and plum vodka (drupes) can be differentiated. In the same way, distillates from apples and pears (pomes) can be easily differentiated. Although, the full resolution of all samples requires discovery of other specific markers, the proposed set of low-molecular-weight compounds is a promising group of universal markers for characterisation of distillates.

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Electrochemical Reduction of Prometryne and the Other 2-Methylthio-4,6-dialkylamino-s-triazine Herbicides at Mercury Electrodes

Electroanalysis (1998)

Jana Skopalová Karel Lemr Milan Kotouček Lubomı́r Čáp Petr Ondra

The electrochemical behavior of the herbicide prometryne was studied in aqueous solutions by DC polarography, differential pulse and cyclic voltammetry and by constant potential coulometry. Only the protonated form of prometryne can be reduced at pH < 6.5. The electrode process includes two irreversible steps. The two-electron reduction of the C–S bond leads to its splitting and a release of methylthiol molecule. The triazine ring of the reduction product is immediately reduced under the uptake of two electrons. Both the intermediate and final products of constant potential electrolysis were identified using chromatographic techniques and mass spectrometric analysis. The reduction mechanism of other 2-methylthio-4,6-dialkylamino-s-triazines is identical.

Coulometry

Polarography

Triazine

10.1002/(sici)1521-4109(199804)10:5<331::aid-elan331>3.0.co;2-6

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Anaerobic microbial metabolism in hyporheic sediment of a gravel bar in a small lowland stream

River Research and Applications (2005)

Eva Hlaváčová Martin Rulı́k Lubomı́r Čáp

Distribution of dissolved oxygen, nitrate, sulphate, carbon dioxide and dissolved organic carbon (DOC), acetate and lactate was studied in the stream and interstitial water along the subsurface flowpath in the hyporheic zone of a small lowland stream. Sediments were found to act as a source of nitrous oxide and methane. Interstitial methane concentrations were significantly much higher in comparison to those from surface water, and were significantly lower in the relatively well oxygenated downwelling zone than in the rather anoxic upwelling zone. The interstitial concentrations of O2, NO3−1 and SO4−2 showed significant decline along the subsurface flowpath, while concentrations of CO2, N2O, DOC, acetate and lactate remained unchanged. In addition to field measurements, ex situ incubation of sediments was carried out in the laboratory. Maximal methane production was found in the incubation assay using acetate (mean value 380 µg CH4 kg DW−1 d−1). Mean value of the denitrification potential was 1.1 mg N2O kg DW−1 d−1. Nitrous oxide production potential reached 71–100% of denitrification potential. Our results demonstrate that respiration of oxygen, nitrate, sulphate and methanogenesis may coexist within the hyporheic zone and that anaerobic metabolism is an important pathway in organic carbon cycling in the Sitka stream sediments. Copyright © 2005 John Wiley & Sons, Ltd.

Hyporheic Zone

10.1002/rra.866

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Citations (54)

Seasonal Measurement of Greenhouse Gas Concentrations and Emissions Along the Longitudinal Profile of a Small Stream

Polish Journal of Environmental Studies (2016)

Václav Mach Adam Bednařík Lubomı́r Čáp Jan Šìpoš Martin Rulı́k

In 2011 the global mean concentration of atmospheric CO 2 was 391 ppm [1], and the average rate of increase in the concentration of atmospheric CO 2 over the period spanning from 1960 to 2005 of 1.4 ppm yr -1 is therefore considered to be the main driver of climate change [2].The global mean concentrations of CH 4 and N 2 O in 2011 were 1,803 ppb and 324 ppb, respectively [1].The significant ability of CH 4 and N 2 O molecules to absorb

10.15244/pjoes/61668

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Zákaznícký vývoj aplikace pro evidenci smluv v informačním systému SAP

Lubomı́r Čáp

V předložene bakalařske praci je zpracovan navrh a realizace aplikace pro spravu dodavatelsko-odběratelských smluv v informacnim systemu SAP. Obsahem prace je popis požadavků uživatelů na aplikaci, navrh a realizace jednotlivých casti aplikace. Jednotlive požadavky jsou rozpracovany do casti: popis požadavku, popis stavajiciho řeseni, navrh řeseni, realizace a porovnani původniho a noveho řeseni. Nejdůležitějsimi uživatelskými požadavky na nový system spravy dodavatelsko-odběratelských smluv jsou: graficke rozhrani aplikace, řizeni opravněni pro přistup ke smlouvam, uživatelsky definovane upozorňovani na různe udalosti ve smlouvě a fulltextove vyhledavani v naskenovaných originalech smluv.

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Nitrophenoxazine als Indikatoren in Acetonitril II. Bestimmung von NH-Säuren

Collection of Czechoslovak Chemical Communications (1973)

Z. Stránský Lubomı́r Čáp Jan Slouka

10.1135/cccc19732712

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Citations (4)

Methane in the hyporheic zone of a small lowland stream (Sitka, Czech Republic)

Limnologica (2000)

Martin Rulı́k Lubomı́r Čáp Eva Hlaváčová