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    Wyświetlanie 1-9 z 9
    Tytuł:
    Bottom Deposits of Stratified, Seepage, Urban Lake (On the Example of Tyrsko Lake, Poland) as a Factor Potentially Shaping Lake Water Quality
    Autorzy:
    Augustyniak, R.
    Neugebauer, M.
    Kowalska, J.
    Szymański, D.
    Wiśniewski, G.
    Filipkowska, Z.
    Grochowska, J.
    Łopata, M.
    Parszuto, K.
    Tandyrak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/125198.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    urban lake
    phosphorus
    bottom sediment
    internal loading
    Opis:
    The object of the study was Tyrsko Lake (area 18.6 ha, max. depth 30.4 m), located in the western part of Olsztyn (Olsztyn Lakeland). This lake is one of the clear water lakes in Olsztyn, but the progressive deterioration of water quality has been observed during recent years. The phosphorus concentration in the water-sediment interface, phosphorus fractions quantity and the amount of components which can bind this element was investigated in the upper (0–5 cm) layer of deposits. The aim of study was to analyze the potential influence of bottom sediment on the lake water quality. The obtained results revealed that the bottom sediment of Tyrsko Lake can be classified as mixed, silica-organic type, with a relatively high content of iron (over 4% Fe in d.w.). The total phosphorus content was ca. 3.5 mg P g,-1 d.w. on average. Phosphorus in the bottom sediment was bound mainly with organic matter (NaOH-nrP fraction), which had over 50% share in TP. Highly mobile fractions (NH4-Cl-P and BD-P) together only included ca. 5% to 7% TP. The obtained results show that the bottom sediment of Tyrsko Lake can bind phosphorus quite effectively. The calculated internal mineral phosphorus loading during summer stagnation period was 10.9 kg and it was lower that the assessed annual external phosphorus load (22.6 kg). The assessed annual phosphorus loading from both sources was still lower than the critical load according to Vollenweider criteria. However, due to the fact that the internal loading phenomenon is occurring in the lake, it should be taken into consideration that the lake water quality can deteriorate gradually during the longer time perspective. These findings should be accounted for in the future if the potential protection and restoration procedures will be developed.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 5; 55-62
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of ring labeled [1-14C]-L-tyrosine
    Autorzy:
    Kański, R.
    Augustyniak, W.
    Kańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148523.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    carbon-14
    labeling
    tyrosine
    enzyme
    optical isotopomer
    Opis:
    The synthesis of specifically ring labeled isotopomer of L-tyrosine, (l-Tyr), using chemical and enzymatic methods is reported. The carbon-14 labeled [1’-14C]-L-Tyr has been synthesized by a 6-step conversion of [2-14C]-malonic acid into [4’-14C]-phenol and its subsequent condensation with S-methyl-L-cysteine using enzyme tyrosine phenol lyase from Citrobacter freundii.
    Źródło:
    Nukleonika; 2006, 51,suppl.2; 13-16
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon isotope effects in the studies of the mechanism of action of tyrosine phenol-lyase
    Autorzy:
    Augustyniak, W.
    Kański, R.
    Kańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148527.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    12C/14C kinetic isotope effects
    tyrosine phenol-lyase
    Opis:
    12C/14C kinetic isotope effects on the hydrolytic cleavage of tyrosine to phenol and ammonium pyruvate catalyzed by Citrobacter freundii tyrosine phenol-lyase have been determined in positions 2, 3 and ring-1' of L-tyrosine. The competitive method with dual-label approach was applied with 3',5'-ring 3H as remote label. The results revealed the change of the effect on carbon atom in position 2 during the reaction course from the high normal values to low inverse values. On the other hand, the effect values on 3 and ring-1' position remained constant during the reaction course. The discussion of these results regarding the reaction mechanism is presented.
    Źródło:
    Nukleonika; 2006, 51,suppl.2; 7-11
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nitroksyl (HNO/NO-) - cząsteczka o potencjalnym znaczeniu farmakologicznym
    Nitroxyl (HNO/NO-) - the molecule of pharmacological significance
    Autorzy:
    Augustyniak, A.
    Skolimowski, J.
    Kontek, R.
    Błaszczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171760.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    nitroksyl
    sól Angeliego
    donory nitroksylu
    tlenek azotu
    nitroxyl
    Angeli's salt
    nitroxyl donors
    nitric oxide
    Opis:
    Nitrogen compounds, as an essential component of many reactions occurring in living organisms, become the object of an extensive research. These compounds became the focus of interest after the properties of nitric oxide, currently the best known nitrogen oxide, had thoroughly been studied [1–3]. Recently, particular attention has been paid to nitroxyl (HNO/NO–), which is the product of one-electron reduction of NO• [4]. Formation of nitroxyl in vivo is still controversial. It seems that this compound could be formed by the reaction of S-nitrosothiols with other thiol proteins (e.g. GSH), directly through the nitric oxide synthetase (NOS), through the oxidation of hydroxylamine by the peroxidase activity of heme proteins or as a result of reduction of nitric oxide NO• [ 5, 6]. Nitroxyl is a liable compound due to dimerization, so it is necessary to use its donors in experiments. Angeli’s salt which forms HNO at physiological pH is the most commonly used donor [7]. Moreover, Piloty’s acid, cyanamide, diazonium diolates or a group of acyloxy nitroso compounds are also used. There are some difficulties with detection of nitroxyl in biological systems. So far, nitroxyl was indirectly identified by detection of N2O, a product of HNO dimerization. Presently, nitroxyl is an object of intensive studies aiming at finding techniques of its direct detection. Recently two such techniques have been designed: one using the reaction of HNO with triarylphosphines, and the other with BOT1 (staining agent) complexed with copper ions, which gives fluorescent signals revealing HNO in living cells [8, 9]. Nitroxyl turned out to have great pharmacological potential [10, 11]. It was demonstrated that this compound affected the activity of many proteins reacting with their thiol groups [12, 13]. Moreover, HNO/NO– influences the contractility of blood vessels and therefore has inotropic and lusitropic effects on myocardium [14]. Nitroxyl seems to be very promising in treating cancerous diseases as it inhibits the activity of an enzyme involved in the process which is the most important for cancer cells – glycolysis [15].
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 3-4; 265-287
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania zagrośeń piorunowych systemów elektronicznych
    Research on lightning threat in electronic systems
    Autorzy:
    Markowska, R.
    Augustyniak, L.
    Sowa, A.
    Wiater, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/267458.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    ochrona odgromowa
    przepięcie atmosferyczne
    zagrożenie piorunowe
    lightning protection
    lightning overvoltages
    lightning threat
    Opis:
    Od kilkudziesięciu lat podejmowane są próby oceny zagrożeń piorunowych urządzeń elektrycznych i elektronicznych. W prowadzonych badaniach szczególna uwaga jest zwrócona na zjawiska zachodzące podczas bezpośrednich wyładowań piorunowych w różnorodne obiekty budowlane, w których pracują systemy elektroniczne. W takich przypadkach do wyznaczania występujących zagrożeń piorunowych można zastosować kompleksową metodę analizy zachodzących zjawisk. Podstawę tej metody stanowią badania symulacyjne prowadzone w rzeczywistych obiektach. Wyniki badań terenowych wykorzystano przy tworzeniu modeli matematycznych oddziaływania prądów piorunowych na systemy elektroniczne.
    The paper presents an overview on different research methods of lightning threat in electronic systems and equipment. These methods were divided in three major groups. The first group refers to measurements and registration of lightning currents and voltages generated during natural or triggered lightning strikes. Not many results of such investigations is available so far due to technical, economical and natural restrictions or limitations. Such researches are usually carried out for tall or large structures located in tropical areas. The second group of research on lightning threat consists of approximate, simulation methods in which surge current and voltage generators are used to force surge current flows in conductive elements of a building or a structure. Surge currents and voltages generated in wires and cables of electronic and electric systems using this method were recorded in various structures. Some example results are presented for large buildings, base stations of mobile communication system and high-voltage substations. Finally, the computer simulation methods of research on lightning threat are presented. The most widely known methods, namely the circuit method and the method based on electromagnetic field theory, are described in detail together with some examples of modeling of lightning strikes to the base station communication tower and the high-voltage substation.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2008, 24; 89-94
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FMR Evidence of Stable Ferromagnetic Correlations at Zigzag Edge States in Graphene
    Autorzy:
    Augustyniak-Jabłokow, M.
    Maćkowiak, M.
    Tadyszak, K.
    Strzelczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386999.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    68.65.Pq
    Opis:
    We studied magnetic properties of a composite of paraffin and graphene flakes. Magnetic properties of this composite were investigated by ferromagnetic resonance/electron spin resonance technique. The ferromagnetic resonance signal from graphene suspension in paraffin is broad and shifted from magnetic field corresponding to g ≈ 2 to the low magnetic field. The temperature dependence of the spectra shows that magnetic ordering in the studied system is sensitive to thermal fluctuations. These features are expected for the 1D ferromagnetism and the obtained results are analyzed in the frame of the theoretical predictions concerning magnetic correlations at graphene edges. Therefore, based on our investigation we can conclude the existence of the magnetic edges in graphene and presence of the ferromagnetic correlations between edge spins.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 537-539
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Centres in Functionalized Graphene
    Autorzy:
    Majchrzycki, Ł.
    Augustyniak-Jabłokow, M.
    Strzelczyk, R.
    Maćkowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387002.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    81.05.ue
    76.50.+g
    Opis:
    Discussion of the origin of paramagnetic centres observed by electron paramagnetic resonance in graphene oxide (GO) and reduced graphene oxide (rGO) is done on the assumption that GO can be considered as a functionalized graphene. This leads to the conclusion that the narrow signal with g close to 2, observed for GO and thermally reduced GO, is due to paramagnetic centres localized on defects and exchange coupled to conduction electrons. Randomness of graphene modification results in variety of parameters of EPR signals. The broad signals observed in GO and rGO and ascribed to magnetic clusters on the zig-zag edge states indicate that the edge magnetism can be preserved by functionalization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 540-542
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Restricted Validity of the Two-State Model Describing a Vibronic EPR g-Factors Averaging in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O Tutton Salt Crystals Doped with Cu$\text{}^{2+}$ Ions
    Autorzy:
    Hoffmann, S. K.
    Kaszyński, R.
    Augustyniak, M. A.
    Hilczer, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011161.pdf
    Data publikacji:
    1999-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.90.+t
    76.30.-v
    Opis:
    Single crystals and powder EPR spectra of Cu$\text{}^{2+}$ ions in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{6}$·6H$\text{}_{2}$O were recorded in the temperature range of 4.2-300 K and the g-factor temperature variations were determined. The g$\text{}_{z}$ and g$\text{}_{y}$ have the values of 2.443 and 2.134, respectively, at the rigid lattice limit below 20 K, and then continuously tend to an average value on heating. This vibronic averaging produced by reorientations of Cu(H$\text{}_{2}$O)$\text{}_{6}$-complexes between Jahn-Teller distorted octahedral configurations is described in terms of a two-state Silver-Getz model which is known as a good model for diamagnetic non-ammonium Tutton salts. We found, however, that this model is only a crude approximation in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{6}$·6H$\text{}_{2}$O below 150 K. Above this temperature the model works better and describes the vibronic dynamics between the two lowest energy potential wells in the adiabatic potential surface differing in the energy of δ$\text{}_{12}$=318(9) cm$\text{}^{-1}$=3.7 kJ/mol.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 6; 733-740
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena stanu innowacyjności i warunków rozwoju przemysłu wyrobów medycznych w Polsce
    Evaluation of the state of innovation and condition for the further development of biomedical engineering industry in Poland
    Autorzy:
    Gacek, A.
    Bąk, P.
    Blacha-Stachowicz, B.
    Augustyniak, P.
    Liebert, A.
    Podbielska, H.
    Maniewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/262123.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
    Tematy:
    wyrób medyczny
    innowacyjność
    perspektywy rozwoju
    medical instrumentation
    innovations
    development trends
    Opis:
    W pracy podjęto próbę identyfikacji potencjału badawczego i technologicznego-produkcyjnego producentów wyrobów medycznych. Mając na względzie te grupę firm, przeprowadzono analizę SWOT, która była podstawą do oszacowania poziomu innowacyjności producentów wyrobów medycznych w Polsce. W tej analizie szczególną uwagę zwrócono na firmy z obszaru zaawansowanych technologii w dziedzinie inżynierii medycznej. Jako rezultat dokonanych analiz wskazano istotne bariery rozwoju innowacyjności w sektorze produkcji wyrobów medycznych. Określone zostały również uwarunkowania i perspektywy rozwojowe tego sektora w ciągu najbliższych lat.
    The presented work is an attempt to identify research and technological potential of Polish producers, active on market of medical products, especially specializing in the medical devices. The SWOT analysis was performed in order to estimate the innovation level in this sector. The special emphasis was placed on advanced technologies in the field of Biomedical Engineering. The limitations of the innovation development, were pointed out, along with perspectives and conditions for further expansion in the nearest future.
    Źródło:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2013, 19, 4; 165-175
    1234-5563
    Pojawia się w:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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