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    Wyświetlanie 1-10 z 10
    Tytuł:
    Synthesis, Characterization of Novel Dinuclear Co(II)-Cu(II) Complexes and Investigation of Their Catecholase and Catalase-Like Activities
    Autorzy:
    Dede, B.
    Cicek, E.
    Karipcin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398819.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ka
    82.80.-d
    87.15.R-
    Opis:
    The purpose of this study is synthesis, characterization and enzyme activity functions of novel dinuclear metal complexes. Therefore two new dinuclear heterometallic cobat(II)-copper(II) complexes have been synthesized and structurally characterized by using Fourier transform infrared method, elemental analysis, inductively coupled plasma optical emission spectrometry, molar conductivity, magnetic moment measurements and thermal analysis. Spectroscopic and stoichiometric data of the metal complexes indicated that the metal:ligand ratio of the complexes were found to be 2:1. Both of the complexes are 1:2 electrolytes as shown by their molar conductivities and paramagnetism. The subnormal magnetic moment values of the dinuclear complexes were explained by an antiferromagnetic interaction. Additionally complexes were each tested both for their ability to oxidation reaction of 3,5-di-tert-butylcatechol to the 3,5-di-tert-butyl-o-benzoquinone presence of O₂ and catalyse the disproportionation of hydrogen peroxide in the presence of the added base imidazole. It was found that both of the complexes exhibited good catecholase and catalase-like enzyme activity.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 203-207
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on Catalase-Like Activity of Some Tc-99m Radiopharmaceuticals
    Autorzy:
    Çıçek, E.
    Dede, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1360331.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.uk
    Opis:
    Hydrogen peroxide is an ubiquitous metabolite in living systems, produced at increased levels in a variety of pathological situations. Therefore suppressing or at least controlling $H_2O_2$ production is important. Catalase enzymes can convert hydrogen peroxide into water and dioxygen and a similar role can be played by transition metal ions or some radiopharmaceuticals. (1) $TcO_4^-$, (2) Tc-99m mercaptoacetyltriglycine (MAG3) and (3) Tc-99m methoxyisobutylisonitrile (MIBI) were each tested for their ability to catalyse the disproportionation of hydrogen peroxide in the presence of the added base imidazole. It was found that (2) and (3) exhibit acceptable catalase-like activity compared to the Tc-99m pertechnetate.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 875-876
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response surface methodology for cobalt removal from aqueous solutions using Isparta pumice and zeolite 4A adsorbents
    Autorzy:
    Çiçek, E.
    Cojocaru, C.
    Zakrzewska-Trznadel, G.
    Jaworska, A.
    Harasimowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146766.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    zeolite
    Isparta pumice
    adsorption
    radioactive waste
    cobalt ions
    response surface methodology
    Opis:
    In this study, the adsorption of non-radioactive cobalt ions from aqueous solutions onto Isparta pumice and zeolite 4A sorbents was investigated. Both adsorbent materials have been activated at 873 K for 2 h prior to adsorption experiments in batch mode. The maximum removal efficiencies of 90% and 99% have been obtained experimentally using Isparta pumice and zeolite 4A, respectively. In addition, the experiments with radioactive 60Co were performed to test zeolite ability to remove radioactive compounds. Likewise, the response surface methodology (RSM) has been applied to develop the predictive regression models to describe the adsorption of cobalt and radiocobalt ions onto zeolite 4A and Isparta pumice. The results indicated that zeolite 4A as well as Isparta pumice could be used as the efficient sorption materials for cobalt and radiocobalt ions removal.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 121-128
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel metal(II) complexes with bidentate Schiff base ligand: Synthesis, spectroscopic properties and dye decolorization functions
    Autorzy:
    Karakaya, C.
    Dede, B.
    Cicek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065151.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ka
    82.80.-d
    89.60.-k
    Opis:
    The bidentate Schiff base ligand 4-chloro-2-[1-(4-phenylphenyl)ethylideneamino]phenol and its mononuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes have been synthesized. Ligand and metal complexes were characterized by elemental analyses, magnetic susceptibility, molar conductivity, ¹H- and ¹³C-NMR, the Fourier transform infrared, UV-Vis, inductively coupled plasma optical emission spectrometry, and thermogravimetric-differential thermogravimetric studies. The results suggest that the mononuclear complexes have a metal to ligand mole ratio of 1:2 and the metal(II) ions are coordinated with the phenolic oxygen and imine nitrogen atoms. Octahedral structures are proposed for the complexes of the Schiff base ligand. Furthermore, the complexes were checked for their efficiency to decolorize the dye methylene blue. In our experiments we found that metal(II) complexes had an acceptable decolorization efficiency against the dye methylene blue.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 208-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological Variations of Chondrocytes in Bovine Articular Cartilage Using Confocal Laser Scanning Microscopy
    Autorzy:
    Çıçek, E.
    Arikanoğlu, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197654.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    Opis:
    Articular cartilage is a highly organized avascular tissue, a matrix consisting of a three-dimensional meshwork of type II collagen fibrils and proteoglycans. To understand the effects of the alteration in chondrocyte shape in response to physiological load in local mechanical properties and, thus, to contribute to experimental load studies, we studied variation of the natural load induced deformations in chondrocytes among five different regions from bovine articular cartilage samples using confocal laser scanning microscopy imaging methods. The morphological differences of the chondrocyte shape, orientation and circularity in articular cartilage were measured. The chondrocytes were observed to be smoother in more loaded regions to the center of the cartilage.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 898-901
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue Life Predictions of Metal Matrix Composites Using Artificial Neural Networks
    Przewidywania trwałości zmęczeniowej kompozytów metalowych przy użyciu sztucznych sieci neuronowych
    Autorzy:
    Uygur, I.
    Cicek, A.
    Toklu, E.
    Kara, R.
    Saridemir, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/355098.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MMCs
    fatigue life prediction
    artificial neural networks
    przewidywania trwałości zmęczeniowej
    sztuczne sieci neuronowe
    Opis:
    In this study, fatigue life predictions for the various metal matrix composites, R ratios, notch geometries, and different temperatures have been performed by using artificial neural networks (ANN) approach. Input parameters of the model comprise various materials (M), such as particle size and volume fraction of reinforcement, stress concentration factor (Kt), R ratio (R), peak stress (S), temperatures (T), whereas, output of the ANN model consist of number of failure cycles. ANN controller was trained with Levenberg-Marquardt (LM) learning algorithm. The tested actual data and predicted data were simulated by a computer program developed on MATLAB platform. It is shown that the model provides intimate fatigue life estimations compared with actual tested data.
    Zastosowano sztuczne sieci neuronowe (ANN) do przewidywania trwałości zmęczeniowej dla różnych kompozytów metalowych, parametrów R, geometrii karbu, i różnych temperatur. Parametry wejściowe modelu obejmowały: różne materiały (M), o różnym rozmiarze cząstek i objętosci frakcji zbrojącej, współczynnik koncentracji naprężeń (Kt), stosunek parametru R (R), naprężenie szczytowe (S), temperaturę (T), natomiast dane wyjściowe składały się z liczby cykli awarii (SSN). Kontroler ANN był trenowany z użyciem algorytmu uczenia Levenberga-Marquardta (LM). Badane dane rzeczywiste i dane przewidywane symulowane były przez program komputerowy opracowany na platformie MATLAB. Wykazano, że model zapewnia oszacowanie trwałości zmęczeniowej bliską rzeczywistym danym badanym.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 97-103
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiencies of the Copper(II) Adsorbed Zeolites in the $H_2O_2$ Disproportionation Reaction
    Autorzy:
    Çıçek, E.
    Dede, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1360225.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.30.-b
    Opis:
    This work describes FT-IR studies results on adsorption of Cu(II) metal cation. Adsorption has been performed on 3A, 4A, 5A, AW-300, ammonium Y zeolite, organophilic, and molecular sieve zeolites using aqueous solution of the metal studied. Changes in intensities and positions of the pseudolattice bands corresponding to ring vibrations have been observed in the measured spectra. These changes are expected particularly in the pseudolattice bands connected with the presence of alumino- and silicooxygen tetrahedral rings in the zeolite structure. Also, Cu(II) adsorbed zeolites were each tested for their ability to catalyse the disproportionation of hydrogen peroxide in the presence of the added base imidazole. The Cu(II) adsorbed zeolites display efficiency in the disproportion reactions of hydrogen peroxide, producing water and dioxygen.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 872-874
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of X-ray Irradiation on Articular Cartilage Mechanical Properties
    Autorzy:
    Cicek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398818.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    Opis:
    A load bearing tissue found at the ends of articulating bones, the articular cartilage provides low friction surfaces for efficient movement. Its mechanical properties are determined by the structure and composition of type II collagen, proteoglycans and interstitial fluid. This work investigates the effects of X-ray irradiation, previously shown to affect the biological properties of the articular tissue, on mechanical properties of articular cartilage using polarized light microscope for imaging and compressive modulus test applied to articular cartilage to determine the effects of the ionizing radiation on mechanical properties. According to the test results, the relaxation time is significantly longer in control than X-ray exposed samples, while the force is much higher showing that the X-ray irradiation causes the reduction in the stiffness of articular cartilage.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 200-202
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic properties of Dy-Eu-Ce Co-doped ZrO₂ nanofibers fabricated via electrospinning
    Autorzy:
    Çıçek Bezır, N.
    Evcın, A.
    Kayali, R.
    Kaşikçi Özen, M.
    Esen, K.
    Cambaz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070411.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    81.07.Gf
    Opis:
    Zirconium oxide (ZrO₂) is one of the widely studied oxide materials because of its excellent electrical, mechanical and optical properties. In this study, undoped and Dy-Eu-Ce co-doped ZrO₂ nanofibers were fabricated by electrospinning method and their crystal structure, surface morphology, optical properties, electrical and electronic properties, and chemical properties have been analyzed using X-ray diffraction, scanning electron microscope (SEM), UV/VIS spectrometer, four point probe technique (FPPT) energy dispersive X-ray (EDX) measurements, respectively.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 300-303
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catecholase-like activity studies of Tc-99m radiopharmaceuticals
    Autorzy:
    Cicek, E.
    Dede, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065129.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.uk
    Opis:
    Catechol oxidase catalyses the oxidation of a broad range of catechols to the corresponding o-quinones through the four-electron reduction of molecular oxygen to water, without acting on tyrosine. The resulting highly reactive quinones autopolymerize to form brown polyphenolic catechol melanins, a process thought to protect the damaged plant against pathogens or insects. This work describes the catalytic activity of some radiopharmaceuticals like Tc-99m pertechnetate, Tc-99m mercaptoacetyltriglycine (MAG3), Tc-99m nanocolloid, Tc-99m methylenebis(phosphonic acid) (MDP) and Tc-99m methoxyisobutylisonitrile (MIBI) for oxidation of catechol. The catalytic oxidation of 3,5-di-tert-butylcatechol by selected radiopharmaceuticals saturated with molecular oxygen was studied in a homogeneous system. All the radiopharmaceuticals exhibited catecholase-like activity.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 213-215
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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