Number of found documents: 7113
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Development of a tube nebulizer for microflow atmospheric pressure chemical ionization mass spectrometry
Strmeň, Timotej; Vrkoslav, Vladimír; Pačes, Ondřej; Cvačka, Josef
2017 - English
A novel nebulizer for microflow atmospheric pressure chemical ionization mass spectrometry was developed. It consisted of a tube with analyte-transporting fused silica capillary inside. The terminal part of the tube was resistively heated using a coiled resistance wire. Optimal nebulizer parameters and construction setup were investigated to fully demonstrate its versability. Corundum appeared to be a more suitable material than quartz for fabrication of the tube nebulizer. The lowest analyte flow rate investigated was 1.0 μl/min with an excellent signal stability reached. Keywords: mass spectrometry; micro-APCI; tube nebulizer Available at various institutes of the ASCR
Development of a tube nebulizer for microflow atmospheric pressure chemical ionization mass spectrometry

A novel nebulizer for microflow atmospheric pressure chemical ionization mass spectrometry was developed. It consisted of a tube with analyte-transporting fused silica capillary inside. The terminal ...

Strmeň, Timotej; Vrkoslav, Vladimír; Pačes, Ondřej; Cvačka, Josef
Ústav organické chemie a biochemie, 2017

UNICELLULAR ALGA CHLORELLA AS A FEED SUPPLEMENT, CURRENT EXPERIENCE AND FUTURE PERSPECTIVES
Kotrbáček, V.; Doucha, Jiří; Kuchařová, V.; Doubek, J.
2017 - English
We studied the effect of Chlorella biomass as a feed supplement. In laying hens we found that diet supplemented with 1 % (i.e. 10 g/kg) of dry disintegrated heterotrophically grown Chlorella biomass significantly increased content of carotenoids in egg yolks of 8 experimental animals already after the first week of supplementation (P<0,01). Compared to 8 control hens these differences remained significantly higher until the end of the eight-week experiment. The average carotenoid concentration was 17,3 mu g per g of yolk in control group and 25,3 mu g per g of yolk in experimental animals (P<0,01). Autotrophically grown Chlorella was supplemented to the 30 gilts one month prior the expected first heat in a dose of 1,5 g per animal per day. These sows entered heat earlier and the number of pregnancy was higher in comparison to the 30 control animals. Other studies observed digestibility of selenium organically bound in Se-enriched Chlorella. The level of selenium in blood, colostrum and also tissues of new born piglets was determined. Group of 8 sows was supplemented with Se-enriched alga during the pregnancy and 3 days after parturition at a dose of 0,3 mg of selenium per 1 kg of feed. The same amount of selenium in the form of sodium selenite was administrated to the control group of 8 individuals. Organic form of selenium significantly increased concentration of Se in blood of sows and colostrum (P<0,05). Piglets born to supplemented sows had also significantly higher level of Se in heart, muscles and liver (P<0.01). The use of fresh Chlorella biomass produced outdoors on a dairy farm was experimentally tested. The liquid fresh biomass applied to dairy cows during the pregnancy at a dose of 15 g dry mass per cow increased the dry matter content in colostrum from 17,5 g per 100 ml of colostrum in control group to 20,5 g per 100 ml of colostrum in supplemented cows (P<0,05). Keywords: Chlorella; feed supplement; flue gas utilization Available at various institutes of the ASCR
UNICELLULAR ALGA CHLORELLA AS A FEED SUPPLEMENT, CURRENT EXPERIENCE AND FUTURE PERSPECTIVES

We studied the effect of Chlorella biomass as a feed supplement. In laying hens we found that diet supplemented with 1 % (i.e. 10 g/kg) of dry disintegrated heterotrophically grown Chlorella biomass ...

Kotrbáček, V.; Doucha, Jiří; Kuchařová, V.; Doubek, J.
Mikrobiologický ústav, 2017

Highly time resolved measurement of atmospheric elemental and organic carbon at a typical background site in Central Europe.
Mbengue, Saliou; Fusek, M.; Schwarz, Jaroslav; Holoubek, Ivan
2017 - English
Atmospheric organic (OC) and elemental (EC) carbon play an important role in atmospheric chemistry, climate change and public health. There have been relatively few studies dealing with EC and OC in rural background sites which are less influenced by urban and industrial emissions. Nevertheless, measurements at background areas are important for understanding the transport and transformation characteristics of anthropogenic air pollutants, and their effects on various aspects of regional and global environment changes. In this study, we focus on variability of EC and OC concentrations (considering various day categories and seasons) from a rural background site which is representative for Central European rural areas.\n Keywords: organic carbon and elemental carbon; rural background; OC/EC ratio; variability Fulltext is available at external website.
Highly time resolved measurement of atmospheric elemental and organic carbon at a typical background site in Central Europe.

Atmospheric organic (OC) and elemental (EC) carbon play an important role in atmospheric chemistry, climate change and public health. There have been relatively few studies dealing with EC and OC in ...

Mbengue, Saliou; Fusek, M.; Schwarz, Jaroslav; Holoubek, Ivan
Ústav výzkumu globální změny , 2017

Use of Water-Modified Supercritical Carbon Dioxide for Direct Preparation of CrystallineMonolithic TiO2 Aerogels.
Cerhová, Marie
2017 - English
We studied a combination of supercritical CO2 and water for the preparation of crystalline and pure nanostructured TiO2 without any thermal processing. The effect of temperature (40–100 °C) and pressure (10–30 MPa) on the purity, structural and textural properties was investigated.\n\n\n Keywords: carbon dioxide; TiO2; pressure Available in a digital repository NRGL
Use of Water-Modified Supercritical Carbon Dioxide for Direct Preparation of CrystallineMonolithic TiO2 Aerogels.

We studied a combination of supercritical CO2 and water for the preparation of crystalline and pure nanostructured TiO2 without any thermal processing. The effect of temperature (40–100 °C) and ...

Cerhová, Marie
Ústav chemických procesů, 2017

Helicene-based Thioureas.
Jakubec, Martin
2017 - English
The main goal of this work was to introduce the helicene moiety into the structure of bis(aryl)thiourea, to prepare a new type of a helicene-based organocatalyst. Several aryl(helicenyl)thioureas were synthesized so far. Their ability to form hydrogen-bond complexes with various types of substrates was verified using NMR and the activity of the catalysts is currently being explored.\n Keywords: helicene moiety; ability; nmr Available in a digital repository NRGL
Helicene-based Thioureas.

The main goal of this work was to introduce the helicene moiety into the structure of bis(aryl)thiourea, to prepare a new type of a helicene-based organocatalyst. Several aryl(helicenyl)thioureas were ...

Jakubec, Martin
Ústav chemických procesů, 2017

High-Temperature Desulfurization of a Producer Gas by La- and Ce-based Oxides.
Brynda, Jiří
2017 - English
Keywords: desulfurization; oxide fuel cells; sorbents Available in a digital repository NRGL
High-Temperature Desulfurization of a Producer Gas by La- and Ce-based Oxides.

Brynda, Jiří
Ústav chemických procesů, 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

Electrocoagulation Scaling-Up for Removal of Toxic Metals, Namely Cr6+ and Ni2+.
Krystyník, Pavel; Klusoň, Petr; Mašín, P.; Kroužek, J.
2017 - English
Presented cotribution deals with application of electrocoagulation process for removal of Cr6+ and other toxic metals, namely Ni2+, Zn2+, Cu2+ and Mn2+ from contaminated groundwater on the site of former galvanization plant. The industrial effluent has pH ranging from 4.2 to 4.8; RAS (dissolved inorganic salts) is 2540 mg/L and conductivity 488 mS/m. Keywords: experiments; electrocoagulation process; electrode Available in a digital repository NRGL
Electrocoagulation Scaling-Up for Removal of Toxic Metals, Namely Cr6+ and Ni2+.

Presented cotribution deals with application of electrocoagulation process for removal of Cr6+ and other toxic metals, namely Ni2+, Zn2+, Cu2+ and Mn2+ from contaminated groundwater on the site of ...

Krystyník, Pavel; Klusoň, Petr; Mašín, P.; Kroužek, J.
Ústav chemických procesů, 2017

Metody hodnocení potenciální zranitelnosti podzemních vod reaktivním dusíkem při pěstování polních plodin na orné půdě
Zemek, František; Pikl, Miroslav; Holub, Petr; Klem, Karel; Záhora, J.; Vavříková, J.
2017 - Czech
Metodika identifikace potenciálního průsaku reaktivního dusíku do podzemních zdrojů vod je založena na hodnocení kombinace konzervativních, těžko měnitelných a časově stabilních faktorů povodí a těch faktorů, které může člověk svým působením v krajině ovlivňovat. K ním patří způsoby a intenzita pěstování polních plodin na orné půdě povodí. Parametry druhé skupiny jsou získávány na základě metod obrazové spektroskoie leteckých hyperspektrálních a satelitních multispektrálních dat Sentinel-2. The methodology demonstrates on the case study of a catchment (cca 200 km2 in size) how to identify the areas with high risk of nitrogen (N) leaching to underground water in arable land. It uses synergy between “conservative” characteristics of the catchment, such as orographic features, bedrock and soil hydrological properties, and the dynamic ones, which are represented by vegetation properties. The latter are identified through the imaging spectroscopy of wheat canopy obtained from airborne hyperspectral and/or Sentinel-2 multispectral data. Keywords: nitrogen leaching; underground water; remote sensing Available at various institutes of the ASCR
Metody hodnocení potenciální zranitelnosti podzemních vod reaktivním dusíkem při pěstování polních plodin na orné půdě

Metodika identifikace potenciálního průsaku reaktivního dusíku do podzemních zdrojů vod je založena na hodnocení kombinace konzervativních, těžko měnitelných a časově stabilních faktorů povodí a těch ...

Zemek, František; Pikl, Miroslav; Holub, Petr; Klem, Karel; Záhora, J.; Vavříková, J.
Ústav výzkumu globální změny , 2017

Komplexní průzkum rybí obsádky jezera Most v roce 2016
Peterka, Jiří
2017 - Czech
Cílem ichtyologického průzkumu jezera Most bylo zmapování stavu a vývoje rybí obsádky, přičemž důraz byl kladen zejména na odhad početnosti a biomasy jednotlivých druhů ryb, na odhad rizik dalšího vývoje rybí obsádky a doporučení dalšího obhospodařování jezera. Sumarizace dosažených výsledků a návrh doporučení pro další sledování jsou obsahem předkládané zprávy. Aim of the complex ichthyological survey of Lake Most was to map the current state and succession of lake’s fish stock with particular emphasis put on abundance and biomass estimates of all fish species, evaluation of possible risks to the further development of the fish stock and recommendations for the lake management. Summarization of achieved results and recommendations for further monitoring are included in the presented report. Keywords: revitalization; community succession; ecosystem monitoring Available at various institutes of the ASCR
Komplexní průzkum rybí obsádky jezera Most v roce 2016

Cílem ichtyologického průzkumu jezera Most bylo zmapování stavu a vývoje rybí obsádky, přičemž důraz byl kladen zejména na odhad početnosti a biomasy jednotlivých druhů ryb, na odhad rizik dalšího ...

Peterka, Jiří
Biologické centrum, 2017

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