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Wyszukujesz frazę "separation factor" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Uranium and neodymium partitioning in alkali chloride melts using low-melting gallium-based alloys
Autorzy:
Melchakov, S. Y.
Maltsev, D. S.
Volkovich, V. A.
Yamshchikov, L. F.
Lisienko, D. G.
Osipenko, A. G.
Rusakov, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/146407.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
neodymium
uranium
gallium
separation factor
reductive extraction
pyrochemical reprocessing
Opis:
Partitioning of uranium and neodymium was studied in a ‘molten chloride salt – liquid Ga-X (X = In or Sn) alloy’ system. Chloride melts were based on the low-melting ternary LiCl-KCl-CsCl eutectic. Nd/U separation factors were calculated from the thermodynamic data as well as determined experimentally. Separation of uranium and neodymium was studied using reductive extraction with neodymium acting as a reducing agent. Efficient partitioning of lanthanides (Nd) and actinides (U), simulating fission products and fissile materials in irradiated nuclear fuels, was achieved in a single stage process. The experimentally observed Nd/U separation factor valued up to 106, depending on the conditions.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 915-920
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and separation quality of various N- and O-donor ligands from quantum-chemical calculations
Autorzy:
Trumm, M.
Schimmelpfennig, B.
Geist, A.
Powiązania:
https://bibliotekanauki.pl/articles/148110.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
actinide chemistry
extracting ligands
lanthanide chemistry
quantum chemistry
separation factor
Opis:
Although BTP (2,6-di(1,2,4-triazin-3-yl)pyridine) has been proven to be a highly effective N-donor ligand for the selective An(III)/Ln(III) separation, the origin of its selectivity is still under discussion. We present in this paper quantum-chemical calculations at the density functional theory (DFT) and MP2 level which highlight the role of the aquo ions in the separation process. Furthermore these data will be the reference for future force-field development to investigate the differences in An(III) complexation reactions compared to their Ln(III) counterparts.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 847-851
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja procesu rozdzielania tryptofanu i proliny w układzie faz odwróconych z wykorzystaniem mikrochromatografii cienkowarstwowej (micro-TLC) w warunkach kontrolowanej temperatury
Optimization of separation protocol of tryptophan and proline in a reversed-phase system using temperature-controlled micro-thin-layer chromatography (micro-TLC)
Autorzy:
Zarzycki, P. K.
Ślączka, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/153060.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikrochromatografia cienkowarstwowa (micro-TLC)
tryptofan
prolina
aminokwasy
ninhydryna
współczynnik rozdzielenia α
współczynnik rozdzielenia alpha
micro-chromatography (micro-TLC)
amino acids
tryptophan
proline
ninhydrin
separation factor alpha
separation factor α
Opis:
Chromatografia cienkowarstwowa jest dogodną metodą do tzw. analiz przesiewowych (z ang. screen analysis) oraz szybkiego badania profili retencji z użyciem różnych faz ruchomych. Nasze badania dotyczą zastosowania termostatowanej mikrochromatografii cienkowarstwowej do optymalizacji procesu rozdzielania wybranych aminokwasów tryptofanu i proliny w układzie faz odwróconych (RP). Uzyskane dane retencyjne umożliwiły określenie optymalnych warunków rozdzielania przy zastosowaniu prostego parametru optymalizacji: maksymalnej wartości współczynnika rozdzielenia (αmax). Parametr ten był obliczany z dokładnością 2% stężenia binarnej fazy ruchomej w zakresie od 0 do 100%, na podstawie danych eksperymentalnych uzyskanych z rozdzielczością 20%. Wybrane kryterium optymalizacji umożliwia bezpośrednie przeniesienie uzyskanych wyników na systemy rozdzielania typu RP z użyciem kolumny zamiast płytek np. wysokosprawnej chromatografii kolumnowej (HPLC).
Thin-layer chromatography (TLC) and high-performance thin-layer chromatography (HPTLC) are commonly used in separation, identification, purification and quantification of different analytes present in complex biological, environmental and pharmaceutical samples. Planar chromatography can be also applied to screen analysis and fast exploration of chromatographic retention profiles using different concentrations of mobile phases components. This method does not require expensive equipment, tedious and time-consuming sample pretreatments and, what is important, allows a parallel separation of many samples at the same time. The spots or bands sprayed onto the TLC plate can be easily detected under visible and UV light (usually 254nm, 366nm) or by post-chromatographic derivatization with visualization reagents, and then digitalized using office scanners. It should be noted that the great advantage of micro-planar chromatography compared to the regular sized TLC is low consumption of the eluents (usually less than 1 mL per analytical run) as well as short analysis time, due to mobile phase migration distance less than 50 mm. Under particular cases (high temperature and low viscosity eluents like acetone, dichloro-methane or n-hexane), non-forced eluent flow micro-chromatographic analysis can be completed within less than 5 minutes. This work is focused on optimization of separation process of two amino acids including tryptophan and proline (Fig. 1) under reversed-phase micro-chromatographic conditions. Particularly, selected amino acids were chromatographed on HPTLC RP-18W (wettable with water) 25 x 50 mm cutted plates using thermostated horizontal micro-chamber and unsaturated conditions (Fig. 2). The target components were sprayed on the start line (1Μg per lane) using a semi-automatic sampler (Linomat 5, Camag). The plates were developed with n-propanol: water binary mixtures as the mobile phases. Different concentrations of alcohol ranging from 0 to 100% (v/v) with steps of 20% were applied. The temperature of chromatographic separation was set at 40oC and chromatographic runs were completed within 10-30 minutes, depending on the water concentration in the mobile phase. The amino acids were visualized by dipping the plates in ninhydrin solution (prepared for concentration 0.3% in ethanol) followed by heating at 120°C for 10 minutes. Picture acquisition was performed using a Plustek OpticPro S12 scanner with an 8-bit per channel color deep mode, 300 DPI resolution, and saved as TIFF files. Retention data were derived from the plates via densitometric scans obtained with help of ImageJ freeware (http://rsb.info.nih.gov/ij). Using the raw retention data set (RF values, retardation factor), the chromatographic profiles of amino acids were calculated with step of 2% (Fig. 3A). Based on the curves observed and relationship RM = logk, where RM and k correspond to mobility and retention factors, respectively, a simple optimization criterion expressed as a separation factor (α) was calculated (Fig. 3B). Using this plot, the best separation conditions of target components were selected taking into account the maximum value of the separation factor (αmax). Due to the equal spot shape of amino acids investigated across the whole range of the mobile phases composition, such approach involving the α values allows fast optimization of separation in planar chromatography and direct application of selected conditions into column chromatographic systems based on e.g. high-performance liquid chromatography (HPLC). It should be noted that the advantages of retention data screening using micro-TLC are very low mobile phase consumption (at level of 300 ΜL per chromatographic run), short analysis time and effective detection of UV-Vis transparent substances using simple visualization reagent.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 6, 6; 624-626
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wydzielanie CO2 z gazów przy zastosowaniu membran dyfuzyjno-rozpuszczalnościowych (PDMS)
CO2 separation form gas mixture using solution-diffusion membranes (PDMS)
Autorzy:
Janusz-Cygan, A.
Warmuziński, K.
Jaschik, M.
Tańczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073411.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
współczynnik permeacji
współczynnik separacji
PDMS
wydzielanie CO2/N2
permeability coefficient
separation factor
CO2/N2
Opis:
Przeprowadzono badania eksperymentalne rozdziału mieszanin CO2/N22/N2
Experimental tests of 2/N2
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 4; 26-27
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Usefulness of PCR/RFLP and ERIC PCR techniques for epidemiological study of Haemophilus parasuis infections in pigs
Autorzy:
Jablonski, A.
Zebek, S.
Kolacz, R.
Pejsak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/30649.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
animal disease
pig
animal infection
epidemiology
Haemophilus parasuis
genotyping
polymerase chain reaction
virulence
diagnosis
microorganism
DNA fragment
electrophoretic separation
environmental factor
molecular method
Opis:
Haemophilus parasuis belongs to opportunistic microorganisms of undefined virulence. The purpose of the studies was to compare suitability of PCR/RFLP in our modification and ERIC PCR for epidemiological study of domestic strains of H. parasuis. The results were evaluated taking into account two different aspects: suitability of the tests for isolating the highest possible number of clone groups and subjective evaluation of the method judged with respect to the following criteria: difficulty, availability of equipment and reagents as well as time and cost of the study. The results obtained in the present study show that the two methods used for typing of H. parasuis had high discriminatory power. Taking into account this parameter it can be concluded that ERIC PCR is more suitable than PCR/RFLP. This justifies the use of ERIC PCR for routine epidemiological analyses of mentioned pathogen. Taking into account the complexity of method used, ERIC-PCR based on random amplification of DNA, proved to be comparable to PCR/RFLP. The last mentioned technique is relatively less expensive and labour-consuming, especially when diagnostic PCR method is used for the epidemiological studies.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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