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    Wyświetlanie 1-4 z 4
    Tytuł:
    Radiation decontamination of herbs and spices
    Autorzy:
    Chmielewski, A.
    Migdał, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148670.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    herbs
    spices
    radiation decontamination
    bioactive agents
    Opis:
    A review regarding application of radiation for decontamination of herbs and spices is presented. General principles of the process and the results of the research on biologically active components are discussed. The report regarding the development in this field in selected countries and regions is included.
    Źródło:
    Nukleonika; 2005, 50, 4; 179-184
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Pt/Al2O3 catalysts produced by sol-gel process to uranyl ion reduction
    Autorzy:
    Deptuła, A.
    Łada, W.
    Olczak, T.
    Chmielewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146103.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    sol-gel
    Pt/Al2O3 catalysts
    uranyl ion reduction
    Opis:
    Various kinds of active alumina supports were obtained by the Institute of Nuclear Chemistry and Technology (INCT) sol-gel process in the following steps: (1) preparation of alumina sols by extraction of nitrates with Primene JMT from aluminium nitrate solution; (2) gelation to spherical particles (with diameter < 100 žm) by extraction of water from sol emulsion in 2-ethyl-1-hexanol; (3) sometimes conversion of NO3 - stabilized gel to OH- form by reaction with ammonia; (4) calcination of gels to ?-Al2O3 with specific surface area > 100 m2/g at 500°C. The powders were then impregnated with chloroplatinic acid and recalcined at 500°C. Catalysts were also prepared by direct gelation of alumina sol containing hydroplatinic acid followed by steps (3) and (4). Pt/Al2O3 catalysts were used for the reduction of 1M UO2(NO3)2 - 0.5M HCOOH solution with hydrogen at atmospheric pressure. The course of the reduction was controlled analytically and by measuring the U(VI)/U(IV) redox potential. It was concluded that the catalysts obtained by impregnation of the supports prepared from nitrate stabilized gels exhibit the best activity and stability.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 79-82
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on biological activity of chitosan after radiation processing
    Autorzy:
    Gryczka, U.
    Gawrońska, A.
    Migdał, W
    Gawroński, S. W.
    Chmielewski, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148626.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    chitosan
    biostimulators
    ionizing radiation
    willow
    biomass
    Opis:
    In recent years there is a trend in industry to limit the usage of chemical compounds. Natural polymers are new promising materials that possess important properties like biodegrability or lack of toxicity. Radiation processing of natural occurring polymers is an area of current research for development of new applications. The aim of this study was to determine the impact of ionizing radiation modification on bioactivity of a natural polysaccharide. Chitosan with different molecular weights was investigated as a biostimulator – a biologically active substance that stimulates some growth processes in plants. Chitosan in solid state was irradiated with electron beam from an electron beam accelerator Elektronika 10-10 with a dose range from 50 to 300 kGy. The effects of irradiation on the molecular weight of chitosan were investigated by viscosity and GPC measurements. Non-irradiated and irradiated chitosan at concentrations 0.001, 0.01, 0.1 and 1 g/dm3 were used for greenhouse tests of its activity for growth promotion of Salix viminalis L. var. gigantea plant. Uniform rooted cuttings (20 per combination) were selected for the test and cultivated in aerated hydroponics culture containing Hoagland’s nutrient solutions plus respective amounts of chitosan. After six weeks of plant exposure to chitosan, data of selected parameters of plant growth were collected. In most cases, except the highest concentration, both forms of chitosan had stimulatory effect on leaf area, length of roots and of newly developed shoots. Also fresh and dry weights of these organs were greater in chitosan treated plants. The highest concentration of chitosan was stimulatory only for a number of roots and newly developed shoots while for other parameters was inhibitory. In comparable concentrations the stimulatory effect was greater for chitosan irradiated in comparison with the non-irradiated one.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 73-76
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of lithium titanate by sol-gel method
    Autorzy:
    Deptuła, A.
    Łada, W.
    Olczak, T.
    Sartowska, B.
    Chmielewski, A.
    Alvani, C.
    Casadio, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147573.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Opis:
    Medium sized spherical particles of Li2TiO3 (with diameters below 100 mi m) can be prepared from peroxy lithium titanate solution (stabilized with citric acid) by a modified INCT variant of the sol-gel process. The process consists of the following main steps: (I) formation of aqueous phase emulsion in 2-ethylhexanol-1 containing the surfactants 1v/o SPAN-80 and 1v/o Ethomen S-15 (EH); (II) gelation of emulsion drops by extraction of water with partially dehydrated EH; (III) filtration and washing with carbon tetrachloride or acetone; (IV) non-destructive thermal treatment. The tritium release from sol-gel process preparation of Li2TiO3 micro-spheres was found very close to that observed for other traditional material however, the new process is more efficient than other processes because of the morphology of the sintered specimens.
    Źródło:
    Nukleonika; 2001, 46, 3; 95-100
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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