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Öğe Antimicrobial activity and composition of essential oils of Mentha spicata cultivated under organic farming conditions in Turkey(GEORG THIEME VERLAG KG, 2008) Kartal, M.; Ucan, U. S.; Kan, Y.; Aslan, S.; Atalay, T.[Abstract not Available]Öğe Determination of Thermodynamic Parameters of Some Complexes of 2-Methylindole-3-Carboxaldehyde 4-Phenyl-3-Thiosemicarbazone(ELSEVIER SCIENCE BV, 1995) Atalay, T.; Özkan, E.Cobalt(II), Ni(II), Cu(II) and Hg(II) form 1:2 (metal-ligand) complexes with 2-methyl-indole-3-carboxaldehyde 4-phenyl-3-thiosemicarbazone. The stability constants of these complexes in 60% (v/v) aqueous DMF were determined at different ionic strengths (0.10, 0.20 and 0.40 M KNO3) and of 25, 30, 35 and 40 degrees C (+/-0.1 degrees C) using a spectrophotometric method. From these constants, the thermodynamic stability constants and thermodynamic parameters Delta G(theta), Delta H-theta and Delta S-theta were calculated.Öğe Diffusion and Selective Transport of Alkali Cations in a Polysulfone Ion-exchange Membrane(GAUTHIER-VILLARS, 1995) Ersöz, M.; Lale, M.; Atalay, T.he diffusion of alkali metals through a charged polysulfonated ICE-450 ion exchange membrane has been measured as a function of pH and conservation of the external solution at 25 degrees C. The permeability and diffusion coefficients were found to increase in the sequence Cs(+)greater than or equal to K+>Na+>Li+ and with the external concentration. This sequence can be explained by considering the hydration of the ions in the membrane. The modes of membrane/solution distribution and the diffusion of cations as a controlling factor in the membrane permselectivity and hydration values of cations both correlated consistently with the flux data, as well as with the estimated membrane permselectivity parameters. The selective transport of K/Na and K/Li binary systems at various pH gradients through the membrane was also investigated under various conditions. The selectivity depended on both the hydrated ionic size and the interaction between the fixed groups in the membrane and the metal ions. A good agreement was found between the observed diffusion coefficients and the selectivity values and the limiting mobility ratio in water.Öğe Effect of N(4)-substituent groups on transfer of 2-benzoylpyridine thiosemicarbazone derivates at the water/1,2-dichloroethane interface(PERGAMON-ELSEVIER SCIENCE LTD, 2007) Akgemci, Emine Güler; Bingöl, Haluk; Atalay, T.; Ersöz, A.Dependent on the pH of the aqueous phase, the transfer of protonated forms of 2-benzoylpyridine N(4)-phenyl thiosemicarbazone (BPPT) (which has antimicrobial, antifungal and anticytotoxic activities) and 2-benzoylpyridine N(4)-ethyl thiosemicarbazone (BPET) across water/1,2dichloroethane (1,2-DCE) interface has been studied by cyclic voltarnmetry. The protonation constants of the ligands (pK(a1)(w) and pK(a2)(w)) were a I a2 determined by spectrophotometry. The standard partition coefficients (log P-i(0)) and the standard Gibbs energies of ionic (cationic) species of ligands (Delta G(tr,i)(0,w -> o)) were calculated from the standard transfer potentials (Delta(w)(o)phi(0)(i)). The standard Gibbs energies of their transfer (Delta G(tr,i)(0,w -> o)) and partition coefficients of neutral species (log P-N) were determined by shake-flask method. These thermodynamic parameters were evaluated as a quantitative and qualitative measure of the lipophilicities of two compounds. The differences between the partition coefficients of cationic and neutral form of compounds [diff(log P1+-N)] were interpreted by results obtained from voltammetric data. Effect of N(4)-phenyl and ethyl groups for transfer of 2-benzoylpyridine thiosemicarbazone derivatives at macro-liquid/liquid interface was investigated. The antimicrobial activity of BPET was tested against four types of bacteria and found to be active against Staphlylococcus aureus. (c) 2007 Elsevier Ltd. All rights reserved.Öğe Kinetic study of copper(II) complexation with 9-ethyl-3-carbazolecarboxaldehyde-thiosemicarbazone and kinetic-spectrophotometric determination of copper(II)(MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006) Bingöl, Haluk; Akgemci, Emine Güler; Atalay, T.The kinetics of complexation reaction of Cu(II) with 9-ethyl-3-carbazolecarboxaldehyde-thiosemicarbazone (ECCAT) has been examined spectrophotometrically. The ligand was synthesized for the first time. The complexation reaction was carried out in a DMF-water medium at 35 degrees C. The complex has maximum absorbance at 393 nm. Kinetic and activation parameters of the complexation reaction were calculated by the Arrhenius and Eyring equations using the data obtained from investigating the effect of temperature on reaction rates under the specified conditions. We also proposed reaction rate equations. Based on the studied complexation reaction, a simple kinetic method for the spectrophotometric determination of copper(II) has been developed. The calibration graphs are linear in the concentration range 0.2-1.9 mu g/mL. The species that caused interference were investigated.Öğe Pulp Responses to Three Dentine Bonding Agents in Dogs’ Teeth(1993) Tanriverdi, F.; Günday, M.; Atalay, T.The purpose of this study was to evaluate pulp reactions to cavities treated with Scotchbond Dual Cure, Gluma and Tenure dentine bonding agents in four adult dogs, at intervals of 7, 30 and 90 days. The reactions were compared with the results from a control group in which the cavities were treated with zinc oxide/eugenol cement. The results indicated that Scotchbond Dual Cure dentine bonding agent caused less pulp reaction than Gluma and Tenure dentine bonding agents. However, long-term (90 days) specimens showed that none of these three bonding agents caused any severe reaction. The recovery of the pulp and a thick layer of reparative dentine formation were found quite significant.Öğe Voltammetric Study of the Transfer of Heavy Metal Ions Assisted by 9-Ethyl-3-Carbazole-Thiosemicarbazone at the Water/1,2-Dichloroethane Interface(2006) Bingöl, Haluk; Akgemci, Emine Güler; Ersöz, Mustafa; Atalay, T.[Abstract not Available]
