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    Tytuł:
    TS-BTPhen as a promising hydrophilic complexing agent for selective Am(III) separation by solvent extraction
    Autorzy:
    Kaufholz, P.
    Sadowski, F.
    Wilden, A.
    Modolo, G.
    Lewis, F. W.
    Smith, A. W.
    Harwood, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147226.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Am-Cm separation
    TODGA
    TS-BTPhen
    liquid-liquid extraction
    Opis:
    The novel hydrophilic back-extraction agent TS-BTPhen (3,3',3'',3'''-[3-(1,10-phenanthroline-2,9- -diyl)-1,2,4-triazine-5,5,6,6-tetrayl]tetrabenzenesulfonic acid) was tested for its selectivity towards Am(III) over Cm(III) and Eu(III) with a TODGA (N,N,N',N'-tetraoctyldiglycolamide) based solvent. Batch experiments were carried out using TS-BTPhen dissolved in aqueous nitric acid solution with tracers of 152Eu, 241Am and 244Cm. A signifi cant increase of the separation factor for Cm over Am from SFCm/Am = 1.6 up to SFCm/Am = 3.3 was observed compared to the use of a TODGA-nitric acid system alone. Furthermore, stripping was possible at high nitric acid concentrations (0.6–0.7 mol/L) resulting in a low sensitivity to acidity changes. The infl uence of the TS-BTPhen concentration was analyzed. A slope of –2 was expected taking into account literature stoichiometries of the lipophilic analogue CyMe4BTPhen. However, a slope of –1 was found. Batch stripping kinetics showed fast kinetics for the trivalent actinides. As an alternative organic ligand the methylated TODGA derivate Me-TODGA (2-methyl-N,N,N',N'-tetraoctyldiglycolamide) was tested in combination with the hydrophilic TS-BTPhen. The Am(III) separation was achieved at even higher nitric acid concentrations compared to TODGA.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 2; 815-820
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regional importance of Alnus pollen as an aeroallergen: a comparative study of Alnus pollen counts from Worcester [UK] and Poznan [Poland]
    Autorzy:
    Smith, M
    Emberlin, J.
    Stach, A.
    Czarnecka-Operacz, M.
    Jenerowicz, D.
    Silny, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/50630.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Worcester
    human disease
    pollen
    pollen grain
    skin risk test
    allergy
    Poznan city
    Europe
    Alnus
    allergen
    Opis:
    Daily average Alnus pollen counts (1996-2005) from Worcester (UK) and Poznań (Poland) were examined with the aim of assessing the regional importance of Alnus pollen as an aeroallergen. The average number of Alnus pollen grains recorded annually at Poznań was more than 2.5 times that of Worcester. Furthermore, daily average Alnus pollen counts exceeded the thresholds of 100, 500 and 1,000 grains/m3 more times at Poznań than Worcester. Skin prick test results (1996-2005) and allergen-specifi c IgE (asIgE) measurements using the CAP (Pharmacia) system (2002-2005), were supplied by the Allergic Diseases Diagnostic Centre in Poznań. The annual number of positive skin prick tests to Alnus pollen allergens was signifi cantly related (p<0.05) to seasonal variations in the magnitude of the Alnus pollen catch recorded at Poznań (r=0.70). The symptoms of patients with positive skin prick tests to Alnus pollen allergens were: 51% pollinosis, 43% atopic dermatitis, 4% asthma, 1% chronic urticaria and 1% eczema. On a scale of 0-6, 20.5% of patients examined for serum asIgE in relation to Alnus pollen allergens had asIgE measurements in classes 5 and 6. Alnus pollen is generally considered to be mildly allergenic. However, the amount of Alnus pollen released into the atmosphere in places such as Poznań may increase its impact on the population and make it one of the more important aeroallergens present.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2007, 14, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena możliwości włączenia Lasów Sobiborskich do sieci obszarów Important Birds Areas oraz obszarów specjalnej ochrony ptaków
    Possibility of inclusion of the Sobibór Forests into Importand Birds Areas and Special Protection Areas networks
    Autorzy:
    Kanclerska, K.
    Karpińska, O.
    Woźniak, B.
    Grzębkowski, M.
    Aftyka, S.
    Belcik, M.
    Bożycki, L.
    Celej, M.
    Chodkiewicz, T.
    Kuszner, M.
    Litwiniak, K.
    Pawelec, M.
    Pietrasz, K.
    Rożycki, A.L.
    Sikora, D.
    Smith, L.
    Stasiak, K.
    Szewczuk, W.
    Sliwiński, S.
    Tylkowski, S.
    Woźniak, M.
    Woźniak, P.
    Wójciak, J.
    Żołądek, K.
    Keller, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/985820.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ochrona przyrody
    Lasy Sobiborskie
    walory przyrodnicze
    fauna
    ptaki
    ochrona zwierzat
    Europejska Siec Ekologiczna Natura 2000
    obszary specjalnej ochrony ptakow
    bird protection areas
    nature 2000 network
    Opis:
    One of the greatest challenges of nature conservation is to identify and locate networks of protected areas, which will preserve the biodiversity. The paper aims to show the ornithological value of the Sobibór Forests (E Poland) and to emphasize the fact that the network of Important Bird Areas (IBA) and Special Protection Areas within Natura 2000 (SPA) may require additions. The study was conducted in the period of 2008−2016, mainly on forested areas occupying 256 km2. The Sobibór Forests are characterized by a large diversity of habitats, but are mainly covered by Scots pine Pinus sylvestris. High diversity of wetlands and marshlands make the Sobibór Forest unique within the country. Three methodologies were used to estimate population size of chosen species: sampling, census and random observations. 31 species from Annex I of the Birds Directive plus 25 species of SPEC or non−SPECE category were observed which allows to consider this area as one of the most valuable for avifauna in Poland. Six breeding species classify the Sobibór Forests as the IBA and SPA. These species include Black Stork Ciconia nigra (8−13 breeding pairs), Common Crane Grus grus (80−120 breeding pairs), Grey Great Owl Strix nebulosa (0−7 breeding pairs i.e. 50−100% of Polish breeding population), Eagle Owl Bubo bubo (6 breeding pairs), White−backed Woodpecker Dendrocopos leucotos (40−70 breeding pairs) and Grey−headed Woodpecker Picus canus (20−40 breeding pairs). Six other species show potential for qualification, but not enough data has been collected yet. The list of this specie includes: Short−toed Snake Eagle Circaetus gallicus, Common Snipe Gallinago gallinago, Stock Dove Columba oenas, European Nightjar Caprimulgus europaeus, Collared Flycatcher Ficedula albicollis and Bluethroat Luscinia svecica. The Sobibór Forests occupy a small area compared to other IBA forests. However, the number of breeding species classifies the surveyed area as 7th among other IBAs. Moreover all eligible species may be considered as a bioindicators of the natural state of the forest. This is proof of the high natural value of this area.
    Źródło:
    Sylwan; 2018, 162, 02; 146-154
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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