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    Wyświetlanie 1-4 z 4
    Tytuł:
    Procesy zużycia według schematu „narzędzie tnące – stopy tytanu”
    Processes of wear by pattern cutting tool - titanium alloys
    Autorzy:
    Korbut, E.
    Wajs, E.
    Radko, W.
    Labunec, W. F.
    Zagrebelny, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/404355.pdf
    Data publikacji:
    2015
    Wydawca:
    Wydawnictwo AWART
    Tematy:
    stopy tytanu
    narzędzie tnące
    adhezja
    titanium alloys
    cutting tool
    adhesion
    Opis:
    W artykule ukazano podstawowe typy zużycia narzędzia tnącego podczas obróbki jednego z różnorodnych trudnoobrabialnych materiałów – stopów na osnowie tytanu.
    The article shown wear processes during cutting of difficult materials, which are titanium alloys. also brought closer to the surface phenomena of friction contact surfaces of the cutting tool and the workpiece.
    Źródło:
    Obróbka Metalu; 2015, 1; 36-39
    2081-7002
    Pojawia się w:
    Obróbka Metalu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytoprotective effect of silybin against lasalocid-induced toxicity in HepG2 cells
    Autorzy:
    Radko, L.
    Cybulski, W.
    Rzeski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/31464.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Lasalocid is an ionophore coccidiostatic agent frequently used in poultry. Its extensive use causes the formation of residues in edible tissues and eggs which may pose a risk to consumers. Silybin is the main compound extracted from the herb milk thistle Silybum marianum and its hepatoprotective effect has been reported in literature. The aim of the study was to compare lasalocid and silybin cytotoxic effects followed by their combined use in HepG2 cell line. A cytoprotective effect resulting from the interaction of both pharmacologically active substances was measured. In this study, an MTT test, coomassie brillant blue binding test, and LDH release test determined the effective concentration (EC₅₀) of the compounds. The isobolograms and combination index were used to assess the nature of interaction. The lowest EC₅₀-value for lasalocid was established via the MTT test. This study revealed a lack of silybin cytotoxic effect on the cells. Co-actions of the two drugs led to a significant decrease of lasalocid cytotoxicity. The isobolograms and combination index showed a remarkable antagonistic effect in the course of silybin and lasalocid interaction. The results indicate that silybin revealed a cytoprotective effect when incubated with lasalocid since its cytotoxic impact on HepG2 cells has been significantly diminished.
    Źródło:
    Polish Journal of Veterinary Sciences; 2013, 16, 2
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase composition and morphology characteristics of ceria-stabilized zirconia powders obtained via sol-gel method with various pH conditions
    Autorzy:
    Nakonieczny, D. S.
    Paszenda, Z. K.
    Basiaga, M.
    Radko, T.
    Drewniak, S.
    Podwórny, J.
    Bogacz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/306224.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zol-żel
    bioceramika
    tlenek cyrkonu
    właściwości termiczne
    morfologia proszków
    sol-gel
    bioceramics
    zirconia
    oxide dopants
    thermal properties
    powder morphology
    Opis:
    High purity, fine crystalline, degradation-free at low temperature powders have attracted special interest in CAD/CAM prosthetic dentistry full ceramic restorations. This study reports the preparation and characterisation of zirconia-ceria (0.9ZrO20.1CeO2) powders. Materials were obtained from zirconium-n-alkoxide and cerium nitrate hexahydrate in the pH 2–4 and 8–10. Methods: Zirconia-ceria powders were obtained with the sol-gel method in a humid-free environment. Thermal analysis (TGA/DTA) of the as-prepared materials was made for an assessment of its behaviour at elevated temperatures. Specimens were dried at 80°C and calcinated in two stages: at 300°C with soaking time 2.5 h and 850°C with holding time 2.5 h, in order to evaluate the phase transformations. Thermal analyses of the as-dried powders were made for an assessment of its thermal behaviour during heat treatment up to 1000 °C. By X-ray diffraction (XRD), polymorphs of ZrO2 were identified. Additionally, scanning electron microscopy (SEM) and laser particle size distribution (PSD) were involved for characterisation of morphology of the powders. Results: We found a correlation between the pH of the colloidal system and the morphology of the as-obtained powders. Based on analysis (SEM,PSD), structures were identified known as soft and hard agglomerates. Conclusions: In summary, it can be stated differences were found between powder morphology depending on the used pH, which can be crucial for powder densification during sintering and compacting green bodies which, as a consequence, may be crucial for the lifetime of zirconia prostheses. Correlations between phase composition and pH are difficult to grasp, and require further more sophisticated studies.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 21-30
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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