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    Wyświetlanie 1-5 z 5
    Tytuł:
    Antinociceptive effect of poneratoxin [PoTX] in rats
    Autorzy:
    Rykaczewska-Czerwinska, M.
    Radosz, A.
    Konopinska, D.
    Wrobel, M.
    Plech, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/55195.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    isolation
    tail immersion test
    analgetic effect
    rat
    ant
    amino acid
    poneratoxin
    venom
    neuropeptide
    Opis:
    Poneratoxin (molecular weight 2932) is a 25 amino acid neuropeptide, isolated from an ant venom. It affects excitability of nerve and muscle fibres by changing the kinetics of the voltage-dependent sodium channel. The aim of the study was to investigate the analgetic effect of synthetic poneratoxin (PoTX) in adult female Wistar rats. In the first part of the study the animals received PoTX intracerebroventricularly. The analgetic effect was evaluated by a tail immersion test. In the second part of the experiment the analgetic effect of PoTX was blocked with naloxone, an opioid receptors antagonist. The study showed that poneratoxin exerts the analgetic effect in rats and this effect is not mediated by central opioid system. Therefore it was concluded that other mechanism is resposible for the effect of PoTX.
    Źródło:
    Pestycydy; 2008, 1-2; 135-141
    0208-8703
    Pojawia się w:
    Pestycydy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Corrosion of Magnesium Alloy AZ31 with Additive Lithium
    Autorzy:
    Przondziono, J.
    Hadasik, E.
    Szala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353288.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy AZ31 with additive of 4.5% Li
    electrochemical corrosion in NaCl
    potentiodynamic test
    immersion test
    SEM
    Opis:
    The purpose of performed tests was evaluation of resistance to electrochemical corrosion of extruded magnesium alloy AZ31 with additive of 4.5% Li. Corrosion tests were performed in 0.01-2.0 M NaCl solutions. Potentiodynamic tests enabled to register polarisation curves. With application of stereoscopic microscope Nikon SMZ745T and electron scanning microscope Hitachi S-4200, the surface of the alloy was observed after immersion tests performed in 1-6 days. Results of performed tests prove explicitly deterioration of corrosion properties of the alloy with the increase of molar concentration of NaCl solution. It can be seen that corrosion process is intensive and that intensity increases with the increase of solution concentration and extension of exposure time.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2359-2363
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of temperature on corrosion resistance of austenitic stainless steel in cl¯ containing solutions
    Autorzy:
    Zatkalíková, Viera
    Markovičová, Lenka
    Powiązania:
    https://bibliotekanauki.pl/articles/111992.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    pitting corrosion
    temperature
    cyclic potentiodynamic test
    immersion test
    pitting potential
    korozja wżerowa
    temperatura
    test potencjodynamiczny
    Opis:
    Temperature is considered a complicated external factor of the susceptibility of stainless steels to the pitting. This paper deals with the corrosion behaviour of AISI 316Ti stainless steel in temperature range 22 - 80°C in aggressive chloride environments (3 and 5% FeCl3 solutions). The corrosion resistance of tested steel is evaluated on the base of results of exposure immersion tests and cyclic potentiodynamic tests. According to the obtained results the resistance of AISI 316Ti to the pitting is markedly affected by temperature changes in the range 22 - 80°C. Intensity of corrosion attack increases with the rise of Cl¯ concentration. Gentle changes of temperature and Cl¯ concentration cause significant differences in character of local damage. The appearance of pitted surfaces changes with the rise of the temperature (a density of pitting increases, a size of pits decreases). The strongest change in appearance is observed between 40 and 50ºC.
    Źródło:
    Production Engineering Archives; 2019, 25; 43-46
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Plastic Forming Processes on the Dissolution Rate of Biocompatible Mg Alloys
    Autorzy:
    Boczkal, S.
    Karaś, M.
    Korczak, P.
    Kapinos, D.
    Koprowski, P.
    Szymański, W.
    Wroński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/355548.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MgLiCaZn alloys
    biomaterials
    structure
    properties
    immersion test
    Opis:
    The effect of plastic deformation process on the dissolution rate of biocompatible Mg alloys was investigated. Two biocompatible MgLi1Ca0,2Zn1 and MgLi1Ca1Zn1 alloys were selected for the study. The alloys were deformed on a 100T press at a temperature of 350°C by conventional extrusion and by the equal channel angular extrusion process (ECAE). The grain size analysis showed a high degree of the grain refinement from approximately 110 mm in the initial state to 2.8 mm after the 3rd pass of the ECAE process. Compared to as-cast state, the degree of strengthening has increased after plastic forming. The results of biodegradation tests have shown a significant increase in corrosion rate after both conventional extrusion and ECAE, although after subsequent ECAE passes, this rate was observed to slightly decrease in the MgLi1Ca1Zn1 alloy. Based on the results of macro- and microstructure examinations, the corrosion progress in samples after the extrusion process was described.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 997-1004
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion resistance of SiMo- and SiCu-types of nodular cast iron in NaCl solution
    Autorzy:
    Vaško, Alan
    Zatkalíková, Viera
    Kaňa, Václav
    Powiązania:
    https://bibliotekanauki.pl/articles/88510.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    nodular cast iron
    corrosion
    exposure immersion test
    NaCl solution
    żeliwo sferoidalne
    korozja
    roztwór NaCl
    właściwości mechaniczne
    właściwości zmęczeniowe
    Opis:
    Nodular cast irons are used in a wide range of industrial applications, especially in the automotive industry. SiMo-type of nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines; SiCu-type of nodular cast iron is used in various components of tribotechnical units. These automotive components often work in a corrosive environment. Therefore, the aim of this paper is to compare the corrosion resistance of two types of the nodular cast irons (SiMo-type and SiCu-type). Corrosion resistance was determined by the exposure immersion test at ambient temperature. Specimens of both types of nodular cast iron were immersed in 3.5 % NaCl solution (to simulate sea water) and gradually removed from the solution after 1, 2, 4 and 8 weeks. Subsequently, the weight loss (g) and the average corrosion rate (g m-2 day-1) were calculated. Experimental results show that nodular cast iron alloyed by Si and Mo has higher corrosion resistance than the nodular cast iron alloyed with Si and Cu. Moreover, the mechanical properties (evaluated by tensile test, impact bending test and hardness test) and fatigue properties of both types of nodular cast iron has been compared in the paper.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2020, 2, 1; 191-198
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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