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Öğe Biocompatibility evaluation of orthodontic composite by real-time cell analysis(SAGE PUBLICATIONS LTD, 2016) Ersoz, M.; Malkoc, S.; Kucuk, E. B.; Bozkurt, B. S.; Hakki, S. S.Introduction: The aim of this study was to evaluate the cytotoxic effects of three different light-cured orthodontic composites. Material and methods: Light Bond (Reliance orthodontic products), Grengloo (Ormco corporation), and Kurasper F (Kuraray Europe GmbH) were selected for the experiment. Specimens were prepared according to the manufacturers' instructions, measuring 5 mm in diameter and 2 mm in thickness. Fibroblast cells were obtained from healthy gingival connective tissues. The composite cylinders were incubated in Dulbecco's modified Eagle's culture medium for 72 h according to ISO 10993-5 standards. The xCELLigence method was used to evaluate fibroblast cell vitality. After seeding 200 mL of the cell suspensions into the wells (20,000 cells/well) of the E-plate 96, gingival fibroblasts were treated with bioactive components released by the orthodontic composite materials and monitored every 15 min for 121 h. Results: There were no significant differences between the human gingival fibroblast (HGF) cell indexes of the control and all testing groups (p > 0.05) at 24 and 48 h. Light Bond demonstrated statistically significant decrease in HGF index (p < 0.05) at 72 h, but there was no significant difference among the Kurasper F, Grengloo, and untreated control groups (p > 0.05). Light Bond (p < 0.001) and Grengloo (p < 0.05) groups had lower HGF cell index values when compared to untreated control group, but Kurasper F demonstrated no significant differences between the control groups at 96 h (p > 0.05). Conclusion: Orthodontic composite materials include biologically active components and may change oral tissue. So, biocompatible orthodontic bonding composites should be used.Öğe Cobalt(II) and Nickel(II) Transfer Through Charged Polysulfonated Cation Exchange Membranes(Academic Press Inc Elsevier Science, 2000) Ersoz, M.; Kara, H.The transport of Co(II) and Ni(II) ions through charged polysulfonated ion exchange membranes under Donnan dialysis conditions has been studied as a function of pH gradient at 25 degreesC. In the Donnan dialysis process, the membrane is bounded by two electrolyte solutions, the one side (donor phase) initially containing metal salts and the other H2SO4 with no external potential held applied. The transport of metal ions through membranes was correlated with the flux data as well as with estimated diffusion coefficients and was found to depend on the interaction between the fixed groups in the membrane and the metal ions. It was observed that the pH gradient influences the transport of metals and the flux of ions increases with H ion concentration in the receiver phase.Öğe Preparation and application of calix[4]arene-grafted magnetite nanoparticles for removal of dichromate anions(ELSEVIER SCIENCE BV, 2009) Ozcan, F.; Ersoz, M.; Yilmaz, M.Magnetic Fe3O4 nanoparticles were prepared by the chemical co-precipitation of Fe(III) and Fe(II) ions. Then, the nanoparticles were modified directly by 3-aminopropyltrimethoxy silane (APTMS) to introduce reactive groups onto the particles' surface, and diester derivative of calix[4]arene was immobilized onto the surface of modified-Fe3O4 nanoparticles by aminolysis reaction. The prepared magnetite nanoparticles (Calix-GM) were characterized by a combination of IR, TGA and TEM analyses. The extraction properties of the new material toward dichromate anions were also studied. It was observed that the prepared magnetite nanoparticles were an effective extractant for the removal of dichromate anions at pH 2.5-4.5. (C) 2009 Elsevier B.V. All rights reserved.Öğe Preparation and characterization of calix[6]arene Langmuir-Blodgett thin film(ELSEVIER SCIENCE SA, 2012) Gurfidan, L.; Ozmen, M.; Atacan, K.; Gubbuk, I. H.; Ersoz, M.; Ozbek, Z.; Capan, R.Calix[6] arene monolayer/multilayer was prepared on a glass substrate and the behavior of monolayer properties investigated at the air-water interface by taking Langmuir isotherm graph. UV-visible, wettability measurements, atomic force microscopy and quartz crystal microbalance measurements were used to monitor the deposition quality of this Langmuir-Blodgett film. Our results showed that a uniform and high quality film with a transfer ratio of approximately 0.99 occurred using the calix[6] arene material at a deposition pressure of 21 mN/m. The surface free energy was determined to be 25.86 mN/m based on contact angle measurements. (C) 2012 Elsevier B. V. All rights reserved.Öğe Silica gel functionalized with 4-phenylacetophynone 4-aminobenzoylhydrazone: Synthesis of a new chelating matrix and its application as metal ion collector(ELSEVIER SCIENCE BV, 2008) Hatay, I.; Gup, R.; Ersoz, M.The silica gel surface immobilized with 4-phenylacetophynone 4-aminobenzoylhydrazone (PAAH) after surface modification by 3-chloropropyltrimethoxysilane (CPTS). The modified silica gel was used for sorption of Cu(II), Ni(II) and Co(II) in aqueous solution. The effect of solution pH, sorption time, temperature and initial metal ion concentration onto metal ions sorption was investigated. The characteristics of the sorption process were evaluated by using the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption isotherms. The sorption of metal ions onto modified silica gel correlated well with the Langmuir type adsorption isotherm and adsorption capacities were found to be 0.012, 0.014 and 0.018 mmol g(-1) for Cu(II), Ni(II) and Co(II) metal ions, respectively. From the D-R adsorption isotherms, it was concluded that chemical interactions and chelating effects were playing an important role in the sorption of metal ions onto modified silica gel. Thermodynamic parameters such as the standard free energy change (Delta G)degrees, enthalpy change (Delta H degrees) and entrophy change (Delta S degrees) were calculated to determine the nature of sorption process. From these parameters, Delta H degrees were found to be endothermic values: 38.39, 18.0, and 14.7 kJ mol(-1) for the same sequence of divalent cations and AS' values were calculated to be positive for the sorption of each metal ion onto the modified silica gel. Negative Delta G degrees values indicated that sorption process for all metal ions were spontaneous in nature although they presented an endothermic enthalpy for the interaction, resulting in an entropically favoured process. (c) 2007 Elsevier B.V. All rights reserved.Öğe Transport Studies of Amino-Acids Through a Liquid Membrane System Containing Carboxylated Poly(Styrene) Carrier(ELSEVIER SCIENCE BV, 1995) Ersoz, M.; Vural, U. S.; Okdan, A.; Pehlivan, E.; Yıldız, S.Transport mechanisms have been studied for amino acids such as p-amino benzoic acid and phenylalanine moving through a bulk organic liquid membrane system containing carboxylated poly( styrene) carrier. The transport in this system, in which one side of the membrane was acidic and the other side was alkaline, was influenced significantly by the initial H+ ion concentration on the acidic side. The passage of amino acids through the organic bulk liquid membrane was governed by an electrochemical interaction between carboxyl groups in the membrane and transporting materials.
