National Repository of Grey Literature 33 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Determination of Composition and Anomeric Ratio in Mixtures of Fluorinated Ologosaccharides.
Červenková Šťastná, Lucie ; Kurfiřt, Martin ; Hamala, Vojtěch ; Karban, Jindřich
Plenthora of glycosylation reactions was performed and sophisticated NMR approach for characteriza-tion of the coressponding products was aplied. ID 19F and *H NMR were utilized for accurate derermina-tion of anomeric ratios and 2D NMR techniques as HSQC, HMBC and COSY were used to assign the signals of individual anomers. In some cases, spectrum simulation was necessary to obtain the desired parameters.
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Plný tet: 00206B6C274C200206081036 - Download fulltextDOC
PM2.5 Chemical Composition at the Rural Background Site Košetice.
Schwarz, Jaroslav ; Cusack, Michael ; Karban, Jindřich ; Chalupníčková, E. ; Havránek, Vladimír ; Smolík, Jiří ; Ždímal, Vladimír
Measurements of atmospheric aerosols at rural background areas are important because they are not influenced by the urban emissions, and are therefore better suited to investigate the influence of long-range transport and trends in concentrations of individual pollutants. Summary of the measurements of total concentration and the concentration of PM10 and PM2.5 components was carried out in the works Putaud et al. (2004, 2010). Although the later work included the measurement of more than 60 stations across Europe, the post-communist countries contained data on PM2.5 from only four locations (Prague, Debrecen, Hungary, and two rural locations). Although Košetice place where this study was made, is also discussed there, it was for only PM10 and total carbon (TC). Therefore, the aim of this study is to fill this information gap, and provide additional information regarding the PM2.5 fraction and composition at the Central European background station Košetice.
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Plný tet: SKMBT_C22016110313110 - Download fulltextPDF
On Usage of Size Segregated Particle Number Concentration to Guess The Origin of PM2.5 at the Rural Background Site Košetice.
Schwarz, Jaroslav ; Cusack, Michael ; Karban, Jindřich ; Chalupníčková, E. ; Havránek, Vladimír ; Smolík, Jiří ; Ždímal, Vladimír
Rural background studies serve mainly to assess the long-range transport influence and long-term trends. However, it is difficult to find a place with no influence of local sources. This is also the case of Košetice observatory having three small settlements within two km from the observatory. Therefore we attempted to analyze if the influence of these or other nearby sources can be seen in our data on PM2.5 chemical composition. Besides other possibilities like specific ratios of various gaseous compounds we concentrated on using size resolved number concentration data because of their dynamics that leads in general into particle growth until they reach accumulation mode. Several similar studies (e.g. Cusack et al. 2013) were performed during recent years.
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Plný tet: SKMBT_22316102413000 - Download fulltextPDF
Fractionation of Turmerones from Turmeric rhizomes (Curcuma longa L.) by Methods Using Supercritical Carbon Dioxide
Topiař, Martin ; Sajfrtová, Marie ; Karban, Jindřich
Cílem této práce je zakoncentrování turmeronů z oddenků kurkumovníku pomocí superkritické sorpce, metody založené na dělení extrahovaných látek pomocí sorbentu, přičemž mobilní fází je zde místo organického rozpouštědla superkritický CO2, jehož rozpouštěcí vlastnosti závisí na jeho hustotě, kterou lze snadno ovlivnit změnami tlaku a teploty.
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Plný tet: SKMBT_C22015111810440 - Download fulltextPDF
Extraction Kinetics and Insecticidal Activity of Volatile Components Isolatedfrom rue by Supercritical CO2.
Sajfrtová, Marie ; Karban, Jindřich ; Sovová, Helena ; Pavela, R.
The aim of the work was to describe the SFE of volatile components from rue and to analyse their insecticidal effects. The objectives consisted in: (a) optimizing the SFE condition (pressure, temperature, extraction time, use of additional separator and concentration of modifier in CO2),investigating their effect on the yield, concentration volatiles in extract and the insecticidal activity, determination of the SFE kinetics of major components in the rue extracts and comparing the SFE with hydrodistillation and maceration.
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Plný tet: SKMBT_C22014090110391 - Download fulltextPDF
Fractionation of Volatile Compounds from Eucalyptus and Lippia Using Sorbents together with Supercritical Fluid Extraction
Topiař, Martin ; Sajfrtová, Marie ; Sovová, Helena ; Karban, Jindřich
The aim of this work was to separate and concentrate the groups of terpenes and terpenoids from eucalyptus (Eucalyptus grandis L.) and lippia (Lippia javanica L.) to several fractions using SFE in one step with adsorption. Extracts of both plants contain significant amount of biologically active compounds and therefore they can find application in medicine or as botanical insecticide in agriculture.
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Plný tet: SKMBT_C22014090110390 - Download fulltextPDF

National Repository of Grey Literature : 33 records found   1 - 10nextend  jump to record:
See also: similar author names
1 Karban, Jan
2 Karban, Jaroslav
1 Karban, Jiří
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