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Wyszukujesz frazę "γ-irradiation" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Radiation induced oxidative DNA base damage and its repair in liver chromatin DNA of rats upon whole body γ-irradiation
    Autorzy:
    Zastawny, Tomasz
    Czerwińska, Beata
    Drzewiecka, Barbara
    Oliński, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1045136.pdf
    Data publikacji:
    1996
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Źródło:
    Acta Biochimica Polonica; 1996, 43, 3; 579-582
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revealing the Defects Introduced in N- or Ge-doped Cz-Si by γ Irradiation and High Temperature-High Pressure Treatment
    Autorzy:
    Wieteska, K.
    Misiuk, A.
    Prujszczyk, M.
    Wierzchowski, W.
    Surma, B.
    Bąk-Misiuk, J.
    Romanowski, P.
    Shalimov, A.
    Capan, I.
    Yang, D.
    Graeff, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812256.pdf
    Data publikacji:
    2008-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.c-
    61.72.-y
    61.82.-d
    Opis:
    Effect of processing under high hydrostatic pressure (= 1.1 GPa), applied at 1270 K, on Czochralski grown silicon with interstitial oxygen content $(c_O)$ up to $1.1×10^{18} cm^{-3}$, admixed with N or Ge (Si-N, c_N ≤ $1.2×10^{15} cm^{-3}$, or Si-Ge, $c_{Ge} ≈ 7×10^{17} cm^{-3}$, respectively), pre-annealed at up to 1400 K and next irradiated withγ-rays (dose, D up to 2530 Mrad, at energy E = 1.2 MeV), was investigated by high resolution X-ray diffraction, Fourier transform infrared spectroscopy, and synchrotron topography. Processing of γ-irradiated Si-N and Si-Ge under high pressure leads to stimulated precipitation of oxygen at the nucleation sites created by irradiation. It means that radiation history of Si-N and Si-Ge can be revealed by appropriate high temperature-high pressure processing.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 2; 439-446
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR Dating of Hydroxyapatite from Fossil Bones. Transient Effects after γ and UV Irradiation
    Autorzy:
    Wencka, M.
    Hoffmann, S. K.
    Hercman, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043612.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    65.90.+i
    Opis:
    ESR measurements at room temperature have been performed on fossil bones of cave bear (from Magurska Cave of the Tatra Mountains) and mammoth (from Dniestr River). Various paramagnetic centres related to defects in hydroxyapatite were identified. The ESR spectrum is dominated by Mn$\text{}^{2+}$ lines and free radical centres CO$\text{}_{2}^{-}$ and CO$\text{}_{3}^{-}$. Suitability of various EPR lines for the dating was evaluated. The spectra are affected by γ-ray and UV irradiation which produce new relatively unstable (transient) radical centres. From their decay curves we determined the delay period (waiting time) between irradiation and ESR dating measurements. For γ-rays the period is about 15 days and depends on the chosen ESR line. UV generates mainly surface O$\text{}^{-}$ centres which decay practically after a few days. The ESR dating of the bear bones using an additive dose method given the age t = 21.7 kiloyears (ky), whereas from radionuclide Th/U method t= 34 ky and from radiocarbon $\text{}^{14}$C method t > 33.1 ky.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 331-337
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coordination Defects in Vitreous As$\text{}_{2}$S$\text{}_{3}$ Induced by γ -irradiation
    Autorzy:
    Shpotyuk, O.
    Balitska, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967921.pdf
    Data publikacji:
    1997-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Jv
    Opis:
    Destruction-polymerization transformations in vitreous As$\text{}_{2}$S$\text{}_{3}$, associated with coordination defects formation processes induced by γ-irradiation, were studied by the IR Fourier spectroscopy method in the region of 400-100 cm$\text{}^{-1}$. All topological variants of these processes, statistically possible in the investigated samples, were taken into account for physical consideration of the real structural changes.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 3; 577-583
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comments on the Effect ofγ-Irradiation on Positronium Formation in Polymers at Low Temperatures
    Autorzy:
    Shantarovich, V. P.
    Hirade, T.
    Kevdina, I. B.
    Gustov, V. W.
    Oleinik, E. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025760.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    Quantitative description of the effect of γ-irradiation of PE and PMMA on positronium formation on the trapped electrons at low temperatures is suggested. The consideration shows that, at least in these substances, the number of the trapping centers is probably enough to localize all ortho-positronium, and therefore the intensity of the long-lived positronium component is dependent mostly on the probability of Ps formation but not on the number of the trapping centers.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 3-4; 497-501
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C
    Autorzy:
    Sadło, J.
    Bugaj, A.
    Strzelczak, G.
    Sterniczuk, M.
    Jaegermann, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146101.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    aragonite
    calcite
    dosimetry
    EPR spectroscopy
    γ-irradiation
    radicals
    Opis:
    In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3 – (orthorhombic symmetry, bulk and bonded to surface), CO3 3–, NO3 2–, O3 –, and in aragonite CO2 – (isotropic and orthorhombic symmetry) depending on the type of calcium carbonate used. For calcium carbonates enriched with 13C more detailed information about the formed radicals was possible to be obtained. In both natural (white coral) and synthetic aragonite the same radicals were identifi ed with main differences in the properties of CO2 – radicals. An application of Q-band EPR allowed to avoid the signals overlap giving the characteristics of radical anisotropy.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 429-434
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metastasis inhibition after proton beam, β- and γ-irradiation of melanoma growing in the hamster eye
    Autorzy:
    Romanowska-Dixon, Bożena
    Elas, Martyna
    Swakoń, Jan
    Sowa, Urszula
    Ptaszkiewicz, Marta
    Szczygieł, Małgorzata
    Krzykawska, Martyna
    Olko, Paweł
    Urbańska, Krystyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1039523.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    metastases
    melanoma
    ocular
    proton beam
    iodine-125
    ruthenium-106
    Opis:
    Standard ocular tumor treatment includes brachytherapy, as well as proton therapy, particularly for large melanoma tumors. However, the effects of different radiation types on the metastatic spread is not clear. We aimed at comparing ruthenium (106Ru, emitting β electrons) and iodine (125I, γ-radiation) brachytherapy and proton beam therapy of melanoma implanted into the hamster eye on development of spontaneous lung metastases. Tumors of Bomirski Hamster Melanoma (BHM) implanted into the anterior chamber of the hamster eye grew aggressively and completely filled the anterior chamber within 8-10 days. Metastases, mainly in the lung, were found in 100% of untreated animals 30 days after enucleation. Tumors were irradiated at a dose of 3-10 Gy with a 106Ru plaque and at a dose of 6-14 Gy using a 125I plaque. The protons were accelerated using the AIC-144 isochronous cyclotron operating at 60 MeV. BHM tumors located in the anterior chamber of the eye were irradiated with 10 Gy, for the depth of 3.88 mm. All radiation types caused inhibition of tumor growth by about 10 days. An increase in the number of metastases was observed for 3 Gy of β-irradiation, whereas at 10 Gy an inhibition of metastasis was found. γ-radiation reduced the metastatic mass at all applied doses, and proton beam therapy at 10 Gy also inhibited the metastastic spread. These results are discussed in the context of recent clinical and molecular data on radiation effects on metastasis.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 3; 307-311
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of Vi phages III to γ-radiation in the presence of cisplatin
    Autorzy:
    Dabrowski, Tomasz
    Kwiatkowski, Bartlomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/1041447.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cytotoxicity
    Vi bacteriophage III
    cisplatin
    irradiation
    Opis:
    In this study we determined Vi bacteriophage III sensitivity to native cisplatin, γ radiation (60Co) or to irradiated cisplatin, and checked the possibility of enhanced Vi bacteriophage III inactivation under combined exposure to cisplatin and γ radiation. We used highly purified phage suspensions in 0.9% NaCl solution or phosphate-buffered saline. Phage suspensions were titrated using a double agar layer method. Our study implies that survival of Vi bacteriophage III shows an exponential inverse correlation with cisplatin concentration in the incubation medium and the time of phage incubation in the presence of cisplatin. The use of irradiated cisplatin reduces phage survival in comparison with suspensions containing non-irradiated cisplatin. Irradiation of phage suspension with cisplatin causes a significant increase of phage inactivation in comparison with either treatment alone. Our results suggest that presence of cisplatin in irradiated medium enhances the radiobiological effect on Vi bacteriophages III.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 2; 545-550
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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