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Evaluation of proposed revitalization of the river Ploučnice close to Mimoň in terms of remobilization of historical contamination
Slabá, Eva; Matys Grygar, Tomáš; Elznicová, J.
2015 - Czech
The aim of the study was to estimate the uranium contamination in the alluvial sediments of original river beds of the Ploučnice river between 72-73 river kilometer on a left bank, near Mimoň town, and evaluate if the contamination should be included into preparation of revitalization projects. The study of contamination was started by mapping the gamma activity of the surface of the floodplain. Based on the resulting map the sediment samples were taken by hand earth drill from the former floodplain and channels abandoned in the 1980s by regulations. The samples were analysed by laboratory X-ray fluorescence (XRF). This step was followed by subsequent mapping by handheld XRF to specify the contamination pattern in the floodplain in more details. The evolution of watershed as well as the exact terrain model were processed by GIS program. Two major contaminated areas have been found, and further sampling was conducted. This enabled us to reconstruct the historical development of contamination at exceptional time scale resolution and describe precisely the evolution from the 19th century to the time of the regulation of that river reach. It has also been shown, that any revitalization in the near future would be probably thwarted due to extremely fast river changes which would cause an immediate re-introduction of the historical contamination into the fluvial system. Cílem této studie je zhodnotit historickou kontaminaci uranem v nivních sedimentech a původních korytech Ploučnice mezi 72. až 73. říčním kilometrem Ploučnice, v nivě na levém břehu řeky, cca 800m pod městem Mimoň a zdůvodnit, proč by mělo posouzení historické zátěže být zařazeno do procesu příprav revitalizačních prací. Bylo provedeno mapování gama aktivity na povrchu nivy, na jehož základě byly ručním žlábkovým vrtákem odebrány hloubkové profily nivních sedimentů i vzorky ze starých koryt odstavených regulacemi v 80. letech, které byly analyzovány rentgenovou fluorescenční spektrometrií (XRF). Následně byla provedena další mapování ručním XRF spektrometrem s cílem upřesnit rozložení uranu v jednom z nejvíc kontaminovaných míst v nivě. Vývoj vodního toku včetně studia přesného modelu terénu byl zpracován pomocí GIS. Analýza hloubkových profilů kontaminantů v nivě umožnila rekonstruovat vývoj historické kontaminace s výjimečným časovým rozlišením, představujícím zatím nejpodrobnější záznam vývoje znečištění od konce 19. století do regulace toku. Bylo prokázáno, že v minulosti docházelo k takovým rychlým bočním posunům meandrujícího toku, že by v důsledku případné revitalizace v blízké budoucnosti pravděpodobně došlo k remobilizaci historické kontaminace zpět do říčního systému.
Keywords:
Ploučnice river; uranium contamination; historical contamination; river floodplain; analysis of sediments; revitalization
Available at various institutes of the ASCR
Evaluation of proposed revitalization of the river Ploučnice close to Mimoň in terms of remobilization of historical contamination
The aim of the study was to estimate the uranium contamination in the alluvial sediments of original river beds of the Ploučnice river between 72-73 river kilometer on a left bank, near Mimoň town, ...
Detection of Dasatinib using Pre-reaction with Copper and Mass Spectrometry
Jaklová Dytrtová, Jana; Jakl, M.; Navrátil, Tomáš
2015 - Czech
The determination of dasatinib (DAS) was provided using front-end electrochemical separation with mass detection. The electrochemical separation is based on the reaction of DAS with copper solid electrode. The affinity of DAS to copper is supported by redox reaction yealding to DAS fragmentation. Stanovení dasatinibu (DAS) bylo provedeno pomocí elektrochemické separace následované hmotnostně spektrometrickou detekcí. Elektrochemická separace je založena na reakci DAS s pevnou měděnou elektrodou. Afinita DAS k mědi je podpořena redoxní reakcí vedoucí k fragmentaci DAS.
Keywords:
electrochemical separation; hyphenation; EC-ESI-MS; copper
Available at various institutes of the ASCR
Detection of Dasatinib using Pre-reaction with Copper and Mass Spectrometry
The determination of dasatinib (DAS) was provided using front-end electrochemical separation with mass detection. The electrochemical separation is based on the reaction of DAS with copper solid ...
Analysis of low abundant lipids in vernix caseosa using chromatographic methods and mass spectrometry
Háková, Eva; Míková, R.; Vrkoslav, Vladimír; Plavka, R.; Cvačka, Josef
2015 - English
The aim of this work is to develop a separation method for characterization of unknown lipids in vernix caseosa. We focused on very low abundant lipids which have not been previously described in vernix caseosa. The total lipid extract was fractionated using low pressure normal phase liquid chromatography to obtain sub-fractions. The sub-fractions were further separated in high performance liquid chromatography mode to isolate classes of lipids. This procedure enabled us to characterise lipid classes by mass spectrometry and identify one of the class as acyl-ceramides with non-hydroxylated fatty acids.
Keywords:
lipids; high performance liquid chromatography; mass spectrometry; vernix caseosa
Available at various institutes of the ASCR
Analysis of low abundant lipids in vernix caseosa using chromatographic methods and mass spectrometry
The aim of this work is to develop a separation method for characterization of unknown lipids in vernix caseosa. We focused on very low abundant lipids which have not been previously described in ...
Ionization techniques
Vrkoslav, Vladimír
2015 - Czech
Classification, principles and application examples of the most important ionization techniques were described. Byly popsány principy nejdůležitějších ionizačních technik, jejich rozdělení a příklady využití.
Keywords:
mass spectrometry; ion source; ionization
Available at various institutes of the ASCR
Ionization techniques
Classification, principles and application examples of the most important ionization techniques were described.
Ion mobility spectrometry DMS/FAIMS
Cvačka, Josef
2015 - Czech
Principles and application examples of ion mobility spectrometry DMS/FAIMS were described. Byly popsány principy mobilitní spektrometrie DMF/FAIMS a byly uvedeny příklady využití.
Keywords:
mass spectrometry; ion mobility; ion analyzers
Available at various institutes of the ASCR
Ion mobility spectrometry DMS/FAIMS
Principles and application examples of ion mobility spectrometry DMS/FAIMS were described.
Mobile mass spectrometry
Cvačka, Josef
2015 - Czech
Using and specifics of mobile mass spectrometers were explained. Byla vysvětlena specifika a příklady použití mobilních hmotnostních spektrometrů.
Keywords:
mass spectrometer; miniaturization; hand-held instruments
Available at various institutes of the ASCR
Mobile mass spectrometry
Using and specifics of mobile mass spectrometers were explained.
Insect repellent and feeding deterrent activity of natural sesquiterpene lactones and their derivatives
Adekenov, S. M.; Mukhametzhanova, G. M.; Atazhanova, G. A.; Harmatha, Juraj
2015 - English
Thirty compounds were investigated in order to detect their repellent and antifeedant activity. The substances were tested on several insect test-objects: Sitophilus granarius, Tribolium confusum and Trogoderma granarium. Five sesquiterpene alpha-exometylene-gamma-lactones and one structurally transformed dimethylamino derivative showed high antifeedant and repellent activities.
Keywords:
sesquiterpene lactones; stored product pests
Available at various institutes of the ASCR
Insect repellent and feeding deterrent activity of natural sesquiterpene lactones and their derivatives
Thirty compounds were investigated in order to detect their repellent and antifeedant activity. The substances were tested on several insect test-objects: Sitophilus granarius, Tribolium confusum and ...
Chiroptical spectroscopy as a sensitive tool for the conformational analysis of antimicrobial peptides
Kocourková, L.; Novotná, P.; Čujová, Sabína; Čeřovský, Václav; Urbanová, M.; Setnička, V.
2015 - English
We tested the utilization of electronic and vibrational circular dichroism for the conformational study of antimicrobial peptides on two examples: melectin and antapin in different solutions of liposomes and micelles mimicking bacterial or eukaryotic membranes. The results show significant content of the alpha-helical conformation in an environment mimicking the bacterial membrane, while it was considerably low in the eukaryotic membrane-mimicking environment.
Keywords:
antimicrobial peptides; circular dichroism; conformation; liposomes; model membranes
Available at various institutes of the ASCR
Chiroptical spectroscopy as a sensitive tool for the conformational analysis of antimicrobial peptides
We tested the utilization of electronic and vibrational circular dichroism for the conformational study of antimicrobial peptides on two examples: melectin and antapin in different solutions of ...
Capillary electrophoretic study of solvent effects on complexation of dibenzo-18-crown-6 with potassium ions
Konášová, Renáta; Jaklová Dytrtová, Jana; Kašička, Václav
2015 - English
Affinity capillary electrophoresis was applied to investigation of solvent effects on stability constant of dibenzo-18-crown-6 complex with potassium ion in mixed hydro-organic solvents at different water/methanol, water/ethanol and water/propan-2-ol ratios. The apparent stability constants of the complex were found to be strongly decreasing with increasing molar fraction of water in the mixed solvents.
Keywords:
affinity capillary electrophoresis; solvent effect; binding constant
Available at various institutes of the ASCR
Capillary electrophoretic study of solvent effects on complexation of dibenzo-18-crown-6 with potassium ions
Affinity capillary electrophoresis was applied to investigation of solvent effects on stability constant of dibenzo-18-crown-6 complex with potassium ion in mixed hydro-organic solvents at different ...
Vernix caseosa and its newly discovered nonpolar lipids
Háková, Eva; Míková, Radka; Vrkoslav, Vladimír; Doležal, A.; Plavka, R.; Cvačka, Josef
2014 - English
The aim of this work is a description of newly, so far undescribed nonpolar lipids, which are components of vernix caseosa.
Keywords:
2D-offline chromatography; mass spectrometry; lipids; vernix caseosa
Available at various institutes of the ASCR
Vernix caseosa and its newly discovered nonpolar lipids
The aim of this work is a description of newly, so far undescribed nonpolar lipids, which are components of vernix caseosa.
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