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    Wyświetlanie 1-6 z 6
    Tytuł:
    Biological efficiency of the Brookhaven Medical Research Reactor mixed neutron beam estimated from gene mutations in Tradescantia stamen hair cells assay
    Autorzy:
    Cebulska-Wasilewska, A.
    Schneider, K.
    Capała, J.
    Coderre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146139.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutrons
    relative biological efficiency
    Tradescantia
    Opis:
    The relative biological effectiveness of low energy neutrons for the induction of various abnormalities in Tradescantia stamen hair mutation (Trad-SH) assay was studied using two clones (T-4430 and T-02), heterozygous for flower color. Dose response relationships for gene mutations induced in somatic cells of Trad-SH were investigated after irradiation with a mixed neutron beam of the Brookhaven Medical Research Reactor (BMRR), currently used in a clinical trial of boron neutron capture therapy (BNCT) for glioblastoma. To establish the RBE (relative biological effectiveness) of the BMRR beam in the induction of various biological end-points in Tradescantia, irradiation with various doses of g-rays was also performed. After irradiation all plants were cultivated several days at Brookhaven National Laboratory (BNL), the transported to Poland for screening the biological end-points. Due to the post-exposure treatment, all plants showed high levels of lethal events and alteration of the cell cycle. Plants of clone 4430 were more reactive to post-treatment conditions, resulting in decreased blooming efficiency that affected the statistics. Slope coefficients estimated from the dose response curves for gene mutation frequencies allowed the evaluation of ranges for the maximal RBE values of the applied beam vs. g-rays as 6.0 and 5.4 for the cells of T-02 and T-4430, respectively. Estimated fraction of doses from neutrons and corresponding biological effects for the clones T-02 and T-4430 allowed to evaluate the RBE values for neutrons part in the beam as 32.3 and 45.4, respectively.
    Źródło:
    Nukleonika; 2000, 45, 2; 115-119
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of a 252Cf source in normal or in B-10 enriched lymphocytes evaluated by SCGE assay, classical cytogenetics and FISH technique
    Autorzy:
    Cebulska-Wasilewska, A.
    Niedźwiedź, W.
    Florjan, D.
    Schneider, K.
    Kopec, M.
    Kreft, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147547.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    BNC reaction
    BSH o 252Cf
    DNA and chromosomal damage
    FISH
    lymphocytes
    Opis:
    Biological effectiveness of a californium-252 source was evaluated after irradiations in vitro of normal or pretreated cells with compound enriched in the B-10 ion (Na210B12H11SH also known as BSH) in order to check the possibility of any enhancement effect due to the process of boron neutron capture. Peripheral blood lymphocytes were used as a model for human cells. Human blood samples or isolated lymphocytes were irradiated with the isotopic source of 252Cf, at the Faculty of Physics and Nuclear Techniques at the University of Mining and Metallurgy, Kraków, (both the neutron source and the samples were placed in an "infinite" polyethylene block). DNA and chromosomal damage were studied to compare the biological effectiveness of irradiation. Single cell gel electrophoresis also known as the Comet assay was done to investigate the DNA damage. Classical cytogenetic analysis was applied to assess the frequencies of unstable aberrations (dicentrics, rings and acentric fragments). To evaluate the frequencies of stable aberrations the fluorescence in situ hybridisation (FISH) with probes for chromosomes 1, 4 (14,3% of the whole genome) was performed. Linear (or close to linear) increases with radiation doses were observed for the DNA damage and aberration frequencies in lymphocytes both untreated or pretreated with BSH. Levels of translocations evaluated for the whole genome were comparable with the frequencies of dicentrics and rings. No significant differences were detected due to radiation dose in the frequencies of sister chromatid exchanges (SCE) detected in the second mitosis. Statistically no significant differences were observed in various biological end-points between normal or boron pre-treated cells.
    Źródło:
    Nukleonika; 2001, 46, 2; 41-49
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of reproductive strategies in dictyopteran insects-clues from ovipositor morphology of extinct roachoids
    Autorzy:
    Hornig, M.K.
    Haug, C.
    Schneider, J.W.
    Haug, J.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/20361.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Dictyoptera, which comprises cockroaches, termites and mantids, is a quite successful group of insects in evolutionary terms with a long fossil record—roachoid insects were already abundant 315 million years ago in the Carboniferous forests. One of the most remarkable autapomorphies of extant dictyopterans, and possibly a major factor for their persisting success, is the ability to produce oothecae. Despite the robustness of this sort of egg package, fossils of oothecae are very rare, the oldest direct evidences being from the Cretaceous Crato Formation in Brazil (115 mya). The ability to produce oothecae is presumably linked to a specific ovipositor morphology, including a significant length reduction. Hence, ovipositor morphology can indirectly inform about the reproductive strategy of a species. Herein we describe the ovipositor morphology of various fossil forms of dictyopteran insects. Early fossil roachoids, in contrast to the modern forms, possessed a very long and prominent ovipositor, reminiscent of the ovipositor in orthopterans (Ensifera), indicating that these forms laid individual, rather small eggs into a substrate. We present examples from different fossil deposits, which show the entire range of ovipositor morphologies, from very long forms over forms with ovipositors partly reduced in length to modernappearing morphologies. Most remarkably, different shapes of ovipositors seem to be present in roachoids in the fauna of the 115 million years old Crato Formation—species with long prominent ovipositors co-existed with species with a reduced short and broad ovipositor. Additionally, females that carry oothecae attached to their abdomen indicate a third type of ovipositor: a further reduced ovipositor as seen in modern forms, which already allowed the internal production of oothecae.
    Źródło:
    Acta Palaeontologica Polonica; 2018, 63, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Refurbished Z Facility: Capabilities and Recent Experiments
    Autorzy:
    Matzen, M.
    Atherton, B.
    Cuneo, M.
    Donovan, G.
    Hall, C.
    Herrmann, M.
    Kiefer, M.
    Leeper, R.
    Leifeste, G.
    Long, F.
    Mckee, G.
    Mehlhorn, T.
    Porter, J.
    Schneider, L.
    Struve, K.
    Stygar, W.
    Weinbrecht, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807851.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.58.Lq
    52.59.Qy
    64.60.A-
    81.30.Bx
    Opis:
    The Z Refurbishment Project was completed in September 2007. Prior to the shutdown of the Z facility in July 2006 to install the new hardware, it provided currents of ≤ 20 MA to produce energetic, intense X-ray sources ( ≈1.6 MJ, > 200 TW) for performing high energy density science experiments and to produce high magnetic fields and pressures for performing dynamic material property experiments. The refurbishment project doubled the stored energy within the existing tank structure and replaced older components with modern, conventional technology and systems that were designed to drive both short-pulse Z-pinch implosions and long-pulse dynamic material property experiments. The project goals were to increase the delivered current for additional performance capability, improve overall precision and pulse shape flexibility for better reproducibility and data quality, and provide the capacity to perform more shots. Experiments over the past year have been devoted to bringing the facility up to full operating capabilities and implementing a refurbished suite of diagnostics. In addition, we have enhanced our X-ray backlighting diagnostics through the addition of a two-frame capability to the Z-Beamlet system and the addition of a high power laser (Z-Petawatt). In this paper, we will summarize the changes made to the Z facility, highlight the new capabilities, and discuss the results of some of the early experiments.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 956-958
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural And Optical Properties Of VOx Thin Films
    Własności strukturalne i optyczne cienkich warstw VOx
    Autorzy:
    Schneider, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/353645.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    VOx thin films
    reactive sputtering
    microstructure
    optical properties
    energy band gap
    cienkie warstwy VOx
    rozpylanie magnetronowe
    mikrostruktura
    właściwości optyczne
    przerwa energetyczna
    Opis:
    VOx thin films were deposited on Corning glass, fused silica and Ti foils by means of rf reactive sputtering from a metallic vanadium target. Argon-oxygen gas mixtures of different compositions controlled by the flow rates were used for sputtering. Influence of the oxygen partial pressure in the sputtering chamber on the structural and optical properties of thin films has been investigated. Structural properties of as-sputtered thin films were studied by X-ray diffraction at glancing incidence, GIXD. Optical transmittance and reflectance spectra were recordedwith a Lambda 19 Perkin-Elmer double spectrophotometer. Thickness of the films was determined from the profilometry. It has been confirmed by XRD that the deposited films are composed mainly of V2O5 phase. The estimated optical band gap of 2.5 eV corresponds to V2O5.
    Cienkie warstwy VOx były nanoszone na szkło Corning metodą rozpylania magnetronowego rf. Jako katody użyto metalicznego wanadu. Były one nanoszone w komorze wypełnionej mieszaniną argonu i tlenu w różnych proporcjach przy ustalonych przepływach. Zbadano wpływ ciśnienia parcjalnego tlenu w komorze na własności strukturalne i optyczne otrzymanych warstw. Własności strukturalne cienkich warstw zostały określone metodą rozpraszania promieniowania rentgenowskiego padającego pod małymi kątami (GIXD). Widma optyczne transmitancji i odbicia zostały wykonane przy użyciu spektrometru Lambda 19 Perkin-Elmer. Grubość badanych warstw zmierzono za pomocą profilometru. Pomiary XRD potwierdziły, że otrzymane warstwy składają się głównie z fazy V2O5. Wyznaczona optycznie przerwa energetyczna wynosząca 2.5 eV odpowiada przerwie energetycznej V2O5.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 957-961
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicified sea life – Macrofauna and palaeoecology of the Neuburg Kieselerde Member (Cenomanian to Lower Turonian Wellheim Formation, Bavaria, southern Germany)
    Autorzy:
    Schneider, S.
    Jäger, M.
    Kroh, A.
    Mitterer, A.
    Niebuhr, B.
    Vodrážka, R.
    Wilmsen, M.
    Wood, C. J.
    Zágoršek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/139394.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Late Cretaceous
    Danubian Cretaceous Group
    macroinvertebrates
    facies
    Silica diagenesis
    stratigraphy
    kreda
    makrobezkręgowce
    facja
    krzemionka diageneza
    stratygrafia
    Opis:
    With approximately 100 species, the invertebrate macrofauna of the Neuburg Kieselerde Member of the Wellheim Formation (Bavaria, southern Germany) is probably the most diverse fossil assemblage of the Danubian Cretaceous Group. Occurring as erosional relicts in post-depositional karst depressions, both the Cretaceous sediments and fossils have been silicified during diagenesis. The Neuburg Kieselerde Member, safely dated as Early Cenomanian to Early Turonian based on inoceramid bivalve biostratigraphy and sequence stratigraphy, preserves a predominantly soft-bottom community, which, however, is biased due to near-complete early diagenetic loss of aragonitic shells. The community is dominated by epifaunal and semi-infaunal bivalves as well as sponges that settled on various (bio-) clasts, and may widely be split into an early bivalve-echinoid assemblage and a succeeding sponge-brachiopod assemblage. In addition to these groups we document ichnofauna, polychaete tubes, nautilids and bryozoans. The fauna provides evidence of a shallow to moderately deep, calm, fully marine environment, which is interpreted as a largescale embayment herein. The fauna of the Neuburg Kieselerde Member is regarded as an important archive of lower Upper Cretaceous sea-life in the surroundings of the Mid-European Island.
    Źródło:
    Acta Geologica Polonica; 2013, 63, 4; 555-610
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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