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    Wyświetlanie 1-4 z 4
    Tytuł:
    Elektroanaliza z wykorzystaniem granic fazowych typu ciecz-ciecz
    Liquid-liquid interface used for electroanalytical applications
    Autorzy:
    Półtorak, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2200438.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    liquid-liquid interface
    voltammetry
    amines
    ions
    electroanalysis
    granica fazowa typu ciecz-ciecz
    woltamperometria
    aminy
    jony
    elektroanaliza
    Opis:
    This work is focused on the electroanalytical application of the system composed from two immiscible electrolyte solutions also known as the electrified liquid-liquid interface. The particular attention is given to the electroanalytical signals originating from the simple ion transfer reactions (transfer of ion either from the aqueous to the organic or from the organic to the aqueous phase) providing ionic currents that can be probed in a function of the applied potential. Advantages and limitations of the soft junctions are underlines and discussed based on the examples published in the literature. Finally, future directions are given further indicating the utility of the concerned platform for the electroanalytical applications.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 11-12; 841-860
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poliamidy i ich synteza na spolaryzowanych granicach fazowych typu ciecz-ciecz
    Polyamides and their synthesis at the polarized liquid - liquid interface
    Autorzy:
    Kowalewska, Karolina
    Sipa, Karolina
    Skrzypek, Sławomira
    Półtorak, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2200432.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    poliamidy
    spolaryzowane granice cieczowe
    granica fazowa typu ciecz – ciecz
    elektrochemia
    polyamides
    polarized liquid – liquid interface
    liquid – liquid interface
    electrochemistry
    Opis:
    Polyamides have found a number of applications in the commercial sector. These materials belong to a large group of chemical compounds - polymers. The interest in these polymers is still growing as new materials can be formed through chemical functionalization or simply addition of different nanomaterials. Polyamides have many unique properties (e.g. chemical resistance, tensile and abrasion resistance, high thermal stability, non-flammability and high mechanical strength even after long periods of use), and compounds such as Nylon® or Kevlar® are leading components in the production of textiles, laboratory equipment, everyday objects or structural elements. Polyamides are used in automotive industry, aviation, and even as protective materials for the military. Several methods to synthesize polyamides exists to date. The most popular are reactions between carboxylic acid chlorides and amines, polycondensation of carboxylic acids with amines or polycondensation of amino acids. Especially spectacular is a reaction of pulling polyamide thread from the liquid-liquid interface known as the "nylon rope trick" experiment (https://www.youtube.com/watch?v=S6asCwVG8zU). Here, the reaction between 1,6-diaminohexane dissolved in the aqueous phase and adipoyl chloride being present in the immiscible with water organic phase is fast and spontaneous. In this work, we have proved that the synthesis of the polyamides at the liquid-liquid interface can be controlled using electrochemistry. In this respect, the electrochemically driven interfacial ion transfer or electrochemically modulated local pH changes are used to trigger the polycondensation within the locus defined by the liquid-liquid interface. The introduction to the electrified soft junction and its modification with polyamide is discussed in the concerned work.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 9-10; 789--802
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of anterolateral thigh flap (ALTF) for functional tongue reconstruction with postoperative quality of live evaluati
    Autorzy:
    Krakowczyk, Łukasz
    Maciejewski, Adam
    Szymczyk, Cezary
    Wierzgoń, Janusz
    Półtorak, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1394335.pdf
    Data publikacji:
    2015
    Wydawca:
    Index Copernicus International
    Tematy:
    free flap
    reconstructive surgery
    anterolateral thigh flap
    Opis:
    The use of microsurgery for oral reconstruction of cancer patients, has become standard treatment in restoring oral function. The free anterolateral thigh flap is one of the most preferred options in reconstruction after total, subtotal or hemiresection of the tonque due to squamous cell cancer. The aim of the study was to present the reconstructive method using anterolateral thigh free flap with evaluation of quality of live. Material and methods. Clinical material includes 46 consecutive patients with tongue cancer, who underwent complex surgical treatment between 2009 and 2011. There were 36 males and 10 females and the M: F ratio was 3.6: 1. All of them were reconstructed using the anterolateral thigh free flap. The quality of life was evaluated 6 months after completing the treatment, based on postoperative functional and aesthetic status. Results. The overall flap survival rate was 96%. Surgical complications were observed in 8 patients (17%). Donor site was closed primarly in 42 cases and in remaining 4 skin graft was required. In all 46 cases understandable speech and return to unrestricted diet mastication and swallowing were achieved. The mean follow-up period after treatment was 32 months. Analysis of aesthetic effects evaluated in 23 cases and shows generally very good results. According to average transformed scores the QOL can be characterized as excellent for >90, very good for 76-90, good for 51-75, moderate for 25-50 and bad for <25 points. Conclusions. Anterolateral thigh flap, with its versatility in design, long pedicle with a suitable vessel diameter, low donor site morbidity, and very good aesthetic effects, could be the ideal flap for functional tongue reconstruction.
    Źródło:
    Polish Journal of Surgery; 2015, 87, 8; 384-388
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czerniaki złośliwe regionu głowy i szyi w materiale Kliniki Chirurgii Onkologicznej i Rekonstrukcyjnej Centrum Onkologii IMSC w Gliwicach
    Autorzy:
    Krakowczyk, Łukasz
    Maciejewski, Adam
    Grajek, Maciek
    Szymczyk, Cezary
    Wierzgoń, Janusz
    Jędrzejewski, Piotr
    Półtorak, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1398663.pdf
    Data publikacji:
    2010
    Wydawca:
    Index Copernicus International
    Tematy:
    czerniak
    płaty wolne
    przeżycia pięcioletnie
    Opis:
    Introduction: About 25% of melanomas are localized in head and neck skin, and this particular localization is most difficult to treat, and the prognosis is less favorable. The depth of melanoma infiltration (Clark and Breslau grade) into the skin is the main factor of local advancement of the disease. Surgical treatment is an essential therapeutic modality in patients with melanoma. Aim: The aim of this study was to evaluate results of our surgical treatment of melanomas in head and neck localisation, treated from 1997 to 2007 in Department of Oncological and Reconstructive Surgery in Center of Oncology IMSC in Gliwice. Material: We analysed group of 47 patients (aged 26 to 75 years, mean 49), treated by surgical excision of malignant melanoma in the head and neck region. Most of the patiens required to use free fl aps or skin graft technique to close posexcisional defect, on basis of clinical considerations. Results: The 5-year total survival for all patients was 62% and were dependent on depht of melanoma infiltration and regional lymph node metastasis. The significant prognostic factors were: localization of primary focus, local progression of disease, free microscopical excision margins sex and age. Conclusions: Prognosis in the patients with melanoma of the head and neck is unreliable and dependent on local advancement of disease and localization of primary focus. Surgical treatment is an essential therapeutic modality in patients with melanoma. Adiuvant radiotherapy after surgical treatment of melanoma of the head and neck is intended for the patiens with high risk of local or regional recurence of disease.
    Źródło:
    Polish Journal of Otolaryngology; 2010, 64, 7; 55-59
    0030-6657
    2300-8423
    Pojawia się w:
    Polish Journal of Otolaryngology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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