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    Wyświetlanie 1-15 z 15
    Tytuł:
    Laser modified functional carbon-based coatings on titanium substrate for cardiac tissue integration and blood clotting inhibition
    Autorzy:
    Major, Roman
    Ostrowski, Roman
    Surmiak, Marcin
    Trembecka-Wójciga, Klaudia
    Lackner, Jurgen
    Powiązania:
    https://bibliotekanauki.pl/articles/1844973.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    thin layers
    migration channels
    laser ablation
    microstructure
    Opis:
    The work focused on developing functional coatings on titanium substrates that would facilitate the integration with the cardiac tissue and with a specific form of connective tissue like blood. Surface modifications consisted in the laser evaporation of part of the biocompatible layer, thus creating a suitable environment for a particular tissue. For the myocardium integration, the metal surface was refined by biohemocompatible coatings. Such surfaces were the starting point for further modifications in the form of channels. The channeled surfaces enabled a controlled cell migration and proliferation. The interaction of endothelial cells with the material was highly dependent on the surface characteristics such as: topography, microstructure or mechanical properties. The controlled cellular response was achieved by modifying the surface to obtain a network of wells or channels of different dimensions via the laser interference lithography. This technique determined a high resolution shape, size and distribution patterns. As a result, it was possible to control cells in the scale corresponding to biological processes. The surface periodization ensured the optimal flow of oxygen and nutrients within the biomaterial, which was of a key importance for the cell adhesion and proliferation. The work attempted at producing the surface networks mimicking natural blood vessels. To stimulate the formation of new blood vessel the finishing resorbable synthetic coatings were applied on the surface to act as a drug carrier. Therefore, the initial trial to introduce factors stimulating the blood vessels growth was performed.
    Źródło:
    Engineering of Biomaterials; 2020, 23, 155; 22-31
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon-based coatings on titanium substrate, laser modifed to control endothelium cell growth
    Autorzy:
    Trembecka-Wójciga, Klaudia
    Major, Roman
    Ostrowski, Roman
    Surmiak, Marcin
    Lackner, Jurgen
    Powiązania:
    https://bibliotekanauki.pl/articles/1844927.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    carbon coatings
    titanium
    biomaterials
    powłoki węglowe
    tytan
    biomateriały
    Źródło:
    Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 61
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The interaction of laser radiation with tissue in the aspect of generating the process of decellularization in the preparation of animal origin autologous tissue
    Autorzy:
    Kopernik, Magdalena
    Major, Roman
    Lis, Grzegorz
    Wilczek, Piotr
    Lis, Maciej
    Imbir, Gabriela
    Chrouda, Abir
    Mzyk, Aldona
    Ostrowski, Roman
    Sanak, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/306501.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zastawka aorty
    FEM
    histologia
    promieniowanie laserowe
    decellularized tissue
    aortic valve
    finite element modeling
    histology
    pulmonary valve
    laser radiation
    Opis:
    Purpose: The aim of the work was to create an appropriate substrate for organ transplantation using bioactive tissue-based scaffold populated by cells of the graft recipient. The purpose of the modeling was to investigate the mechanical effects of wave loading of aortic and pulmonary tissue material. Methods: The biological properties of tissues of aortic and pulmonary valves were modified by the process of decellularization. The host cells were removed by various physical methods with focus on minimal degradation of the extracellular matrix. Thus, the decellularization process was controlled by histological methods. The tissue decellularization process was simulated by finite element modelling. Results: The mechanical results represented by a displacement at the center of the sample were coherent and the heterogeneity of the distribution of the caves on the surface of the samples was confirmed, both by experiment and in the simulation by the alternate occurrence of local minima and maxima. The latter results from the uneven removal of cells from the effect of the wave causing decellularization were also predicted by the numerical model. Laser radiation had a destructive effect on the components of the extracellular matrix (e.g., collagen and elastic fibers), mainly depending on the fluence and number of pulses in a single exposure. Conclusions: The differences between the valve tissue materials were shown, and the impact of the process of decellularization on the properties of the tissues was analyzed. It should be emphasized that due to low absorption and high scattering, laser radiation can deeply penetrate the tissue, which allows for effective decellularization process in the entire volume of irradiated tissue.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 1; 67-77
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underwater navigation system based on Doppler shift – measurements and error estimations
    Autorzy:
    Ostrowski, Zawisza
    Salamon, Roman
    Kochańska, Iwona
    Marszal, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/260234.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    underwater acoustics
    navigation systems
    Doppler shifts
    Opis:
    A new acoustic navigation system was developed to determine the position and speed of moving underwater objects such as divers and underwater vehicles. The path of an object and its speed were determined by the Doppler shifts of acoustic signals emitted by a transmitter placed on the object and received by four hydrophones installed at the periphery of the monitored body of water. The position and speed measurements were affected by errors mainly caused by acoustic reflections (returns) from the water body boundaries and surface reverberations. This paper discusses the source of the disturbances with the results of a simulation test and experimental measurements. It was demonstrated that the magnitude of the errors could be acceptable in most of the potential applications of the acoustic navigation system.
    Źródło:
    Polish Maritime Research; 2020, 1; 180-187
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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