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    Wyświetlanie 1-4 z 4
    Tytuł:
    Positronium Formation in Organic Liquids
    Autorzy:
    Karbowski, A.
    Fedus, K.
    Służewski, K.
    Bruzdowska, J.
    Karwasz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030028.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    82.30.Gg
    36.10.Dr
    Opis:
    This paper reports on the results of positron annihilation lifetime measurements of three organic liquids: benzene (C₆H₆), cyclohexane (C₆H₁₂), and methanol (CH₃OH). The lifetime spectra are acquired at different temperatures for non-degassed, degassed, and oxygen-saturated samples, at temperatures between 5°C and 25°C. The spectra are analyzed using a standard three-exponential model. The influence of oxygen on each lifetime and intensity component is discussed.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1466-1469
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence and positron annihilation lifetime studies on pellets of ZnO nanocrystals
    Autorzy:
    Karbowski, A.
    Fedus, K.
    Patyk, J.
    Bujak, Ł.
    Służewski, K.
    Karwasz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148001.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    photoluminescence (PL)
    positron annihilation lifetime spectroscopy (PALS)
    X-ray diffraction (XRD)
    ZnO nanocrystals
    Opis:
    We explore the interrelationships between the X-ray diffraction patterns, the photoluminescence spectra and the positron lifetimes obtained from circular pellets composed of commercial ZnO nanoparticles. The experimental results are studied as a function of thermal treatment at different temperatures. X-ray diffractograms reveal the temperature- independent wurtzite phase structure of nanocrystals and show huge enlargement of ZnO grains after annealing at temperatures higher than 700 centigrade. Photoluminescence measurements exhibit two emission bands : a near band edge emission in UV (small tilde 378 nm) and a defect-related broad visible peak with a maximum in the green region ( small tilde 502 nm). The significant enhancement of the green emission at the expense of UV luminescence is observed after sample sintering at 800 and 1000 centigrade. The positron annihilation lifetime spectroscopy (PALS) is applied in order to study the thermally induced evolution of defects. The lifetime components show a step-like dependence on the thermal treatment, but do not follow exactly the variation in crystallographic phases and only vaguely follow differences in photoluminescence. The positron data indicate therefore some additional structural and/or defect changes. The possible origin of green luminescence from ZnO pellets is discussed.
    Źródło:
    Nukleonika; 2013, 58, 1; 189-194
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of age on a clinical presentation of Toxocara spp. infection in children
    Autorzy:
    Mazur-Melewska, K.
    Miania, A.
    Figlerowicz, M.
    Kemnitz, P.
    Sluzewski, W.
    Michalak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/51466.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Toxocariasis is a helminthozoonosis due to the infestation of humans by roundworms, Toxocara spp. Actual informations indicate it the most common worm infection in many countries, typically connected with rural areas. The authors analyzed the documentation of 84 children with positive serology to this worm. An individual record was made and following data were restricted: anamnesis data, clinical symptoms, epidemiological data, eosinophils number, level of immunoglobulins G and E. The highest Toxocara spp. seropositivity frequency was found in the schoolchildren aged 7-10. The most frequent clinical findings in children infected Toxocara spp. were lymphadenopathy, hepatomegaly, arthralgia and arthritis. 15.5% of seropositive patients presented non-specific symptoms originating from the central nervous system: headaches, sleep and behavioural disorders, and hyperactivity. The mean eosinophilia in the peripheral blood was detected in the youngest children: 4,023 cell/μl, which is 15.55 times more than the limit value. Hyperimmunoglobulinemia E was detected in all age groups, and the youngest children presented a serum concentration of IgE that was 16.47 times higher than the limit value. Conclusions: 1. Toxocara spp. infection is detected in children at every age, but the most specific age group are schoolchildren, representing 38% of positive individuals. 2. The clinical spectrum of toxocariasis reflects various manifestations depending on the internal organs infected by the migrating worms and the intensity of infection. 3. Eosinophilia seems to be a good marker of infection in young children who have a more symptomatic course of the disease. 4. Hyperimmunoglobulinemia IgE can be the important element which distinguishes between current and past Toxocara infection, but its meaning is not connected with the age of infected children
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Human cytomegalovirus infection as a lifelong health problem
    Autorzy:
    Figlerowicz, M.
    Modlinska-Cwalinska, A.
    Mania, A.
    Mazur-Melewska, K.
    Kemnitz, P.
    Jonczyk-Potoczna, K.
    Sluzewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/80892.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    human cytomegalovirus
    cytomegalovirus
    infection
    health problem
    patient
    immune system
    peripheral blood cell
    atherosclerosis
    cardiovascular disease
    myocardial ischaemia
    myocardial infarction
    hypertension
    neoplastic transformation
    child
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2011, 92, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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