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    Wyświetlanie 1-4 z 4
    Tytuł:
    Centra transferu technologii w Polsce. Analiza, bariery i perspektywy rozwoju
    Centers for technology transfer in Poland. Analysis, barriers and prospects for development
    Autorzy:
    Majczak, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/593150.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Akademicki inkubator przedsiębiorczości
    Komercjalizacja wiedzy
    Ośrodki innowacji i przedsiębiorczości
    Academic incubator of entrepreneurship
    Centers for innovation and entrepreneurship
    Commercialization of knowledge
    Opis:
    W artykule przedstawiono istotę centrum transferu technologii. Zdiagnozowano obecny stan oraz dokonano analizy tendencji zmian centrum transferu technologii na przestrzeni kilkunastu lat w Polsce. Przedstawiono bariery rozwoju centrum transferu technologii w Polsce, a w ostatniej części – przyszłe plany i perspektywy rozwojowe centrów transferu technologii w Polsce w XXI w.
    The article presents the essence of the Center for Technology Transfer (CTT). It diagnoses the current state and analyzes the tendency in the changes in Poland concerning CTTs during the last decade. Barriers for CTTs’ development in Poland have been presented with the final part of the article being devoted to plans for the future and the prospects for CTTs’ development in Poland in the 21st century.
    Źródło:
    Studia Ekonomiczne; 2016, 306; 81-96
    2083-8611
    Pojawia się w:
    Studia Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analyzing mechanical vibrations of an aircraft opposed piston engine
    Autorzy:
    Biały, Michał
    Grabowski, Łukasz
    Skórzyński, Bartłomiej
    Barański, Grzegorz
    Majczak, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2097574.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    DIAdem
    mechanical vibrations
    opposed pistons
    PZL-100
    vibroacoustics
    drgania mechaniczne
    tłoki przeciwstawne
    wibroakustyka
    Opis:
    The paper presents the results of the bench tests to measure mechanical vibrations of a new aircraft opposed piston engine with reciprocating pistons. The PLZ-100 engine is a three-cylinder, six-piston, two-shaft drive unit with a two-stroke diesel cycle. This type of engine is dedicated for powering light aircraft, e.g. autogyros. The tests were carried out on a test bench at the Lublin University of Technology. The engine was loaded with constant torque, for several fixed values of rotational speed of a crankshaft. The angle of the start of diesel injection was changed for each of the rotational speeds. The mechanical vibrations that accompanied the operation of this drive unit were recorded with three measurement transducers and a National Instruments conditioning system. Each of the transducers was mounted on a different axis of the engine. The signals were analyzed from their diagrams with the DIAdem software. The results were the diagrams of effective speed and vibration acceleration to conduct a vibration-acoustic evaluation of the PLZ-100, detect and prevent various types of defects or failures.
    Źródło:
    Combustion Engines; 2021, 60, 4; 3--7
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A possible involvement of plasma membrane NAD(P)H oxidase in the switch mechanism of the cell death mode from apoptosis to necrosis in menadione-induced cell injury.
    Autorzy:
    Niemczyk, Edyta
    Majczak, Anna
    Hallmann, Anna
    Kędzior, Jakub
    Woźniak, Michał
    Wakabayashi, Takashi
    Powiązania:
    https://bibliotekanauki.pl/articles/1041516.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    menadione
    NADPH oxidase
    necrosis
    superoxide
    apoptosis
    Opis:
    The effects of inhibitors of plasma membrane NADPH oxidase on menadione-induced cell injury processes were studied using human osteosarcoma 143B cells. The intracellular level of superoxide in the cells treated with menadione for 6 h reached a maximum followed by an abrupt decrease. The population of apoptotic cells detected by Annexin V and propidium iodide double staining also reached its maximum at 6 h of menadione-treatment while that of necrotic cells increased continuously reaching 90% of the total population at 9 h of the treatment. Pretreatment of the cells with inhibitors of NADPH oxidase, including diphenyliodonium chloride, apocynin, N-vanillylnonanamide and staurosporine was effective in lowering the menadione-induced elevations of superoxide, and also in the suppression of the switch of the cell death mode from apoptosis to necrosis in menadione-treated cells except for the case of staurosporine. These results strongly suggest that superoxide generated by NADPH oxidase, besides that generated by the mitochondria, may contribute to the remarkable increase in the intracellular level of superoxide in the cells treated with menadione for 6 h resulting in the switch from apoptosis to necrosis, although a direct evidence of the presence of active and inactive forms of NADPH oxidase in control and menadione-treated 143B cells is lacking at present.
    Źródło:
    Acta Biochimica Polonica; 2004, 51, 4; 1015-1022
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Partial characterization of human choriocarcinoma cell line JAR cells in regard to oxidative stress.
    Autorzy:
    Hallmann, Anna
    Klimek, Jerzy
    Masaoka, Makoto
    Kamiński, Marcin
    Kędzior, Jakub
    Majczak, Anna
    Niemczyk, Edyta
    Woźniak, Michał
    Trzonkowski, Piotr
    Wakabayashi, Takashi
    Powiązania:
    https://bibliotekanauki.pl/articles/1041517.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    menadione
    flow cytometry
    JAR cells
    placenta
    H2O2
    oxidative stress
    Opis:
    Characterization of free radical-induced cell injury processes of placenta cells is of vital importance for clinical medicine for the maintenance of intrauterine fetal life. The present study has analyzed cell injury processes in cells of the choriocarcinoma cell line JAR treated with menadione, an anticancer drug, and Hg2O2 in comparison to osteosarcoma 143B cells using electron microscopic and flow cytometric techniques. Flow cytometry on JAR cells exposed to 100 μM menadione and double-stained with Annexin V and propidium iodide (PI) detected apoptotic cells reaching the maximum after 4 h of incubation with a rapid decrease thereafter. Viable cells became decreased to 46% of the control after 2 h of incubation, reaching 5% after 4 h. Cells stainable with both Annexin V and PI began to increase distinctly after 2 h of incubation, reaching 55% after 4 h. Electron microscopy showed that cells stainable with both dyes specified above had condensed nuclei and swollen cytoplasm, suggesting that they were undergoing a switch of the cell death mode from apoptosis to necrosis. On the other hand, 90% of 143B cells remained intact after 4 h of menadione treatment although the intracellular levels of superoxide were always higher than those of JAR cells treated with the drug. In contrast, JAR cells were more resistant than 143B cells to H2O2-induced cytotoxicity. These results may suggest that cytotoxicity of menadione cannot be explained simply by oxygen free radicals generated from the drug. The resistance of JAR cells to oxygen free radical-induced cytotoxicity may be advantageous for intrauterine fetal life.
    Źródło:
    Acta Biochimica Polonica; 2004, 51, 4; 1023-1038
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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