Yazar "Aydin H." seçeneğine göre listele

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    Agar-plate screening for acid dyes decolourization by three strains of Pleurotus eryngii isolated from Tunceli, Elazig and Hakkari Province of Turkey
    (Chemical Publishing Co., 2010) Yildirim N.; Yildiz A.; Aydin H.
    Many synthetic dyes present in industrial wastewaters are resistant to degradation by conventional treatments. In this study, the ability to decolourize two textile dyes by Pleurotus eryngii strains collected from geographically different habitats of Turkey was evaluated on agar plates. For all strains, growth and decolourization halos were determined on malt extract agar plates containing 0.1 and 0.2 g/L of acid red 183 or acid green 25. Each P. eryngii strain showed certain decolourization capacities and was able to decolourize both acid red 183 and acid green 25 on the malt extract agar plates, but not to the same extent. Both dyes at all concentrations were found to be toxic for P. eryngii growth. The presence of the dyes in plates reduced the mycelial growth of all strains in comparison with the control culture growing in the medium without dyes. A positive correlation was found between the mycelial growth rate and the decolourization ability.
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    Öğe
    Characterization and spectrophotometric studies of new Cu(II), Ni(II), Zn(II) complexes with schiff base derived from 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde
    (2005) Aydin H.; Ziyadanoğullari B.; Temel H.
    The thermodynamic parameters of complexes of Cu(II), Ni(n), and Zn(II) cations with 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde were determined in 60% (v/v) DMF-water, with various ionic strengths (0.07, 0.13, and 0.2 M NaNO3), and at different temperatures (25, 30, 35, and 40 ± 0.1°C) using a spectrophotometric method. Sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water) (?G°, ?H°, ?S°) based on these formation constants were determined. The values of enthalpy change are negative for all systems. The ligand behaves toward the metal ion as a tetradentate ligand. The acid dissociation constant of ligand was investigated in 60% (v/v) DMF-water and calculated at different temperatures. Copyright © 2005 by Aydin, Ziyadanoğullari, Temel.
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    Öğe
    New direction for measurement of microleakage in cariology research
    (2010) Yavuz I.; Aydin H.
    The present study introduces the feasibility of a different new direction to determining the microleakage volume associated with dental restorations and the relative marginal adaptation deficiency of teeth in in vitro conditions. Our method utilizes the molecular adsorption characteristics of Methylene Blue. It was concluded that investigations showed the microleakage volume measurement method looking as a valuable new technique for the in vitro study of microleakage dynamics around dental restorations.