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Öğe Bis-Schiff Base Derivatives of 2,5-Dihydroxybenzaldehyde: Synthesis, Characterization and Antimicrobial Activity of Their Cu(II), Co(II) and Zn(II) Complexes(Taylor & Francis Inc, 2013) Sahin, M.; Kocak, N.; Arslan, U.; Sahin, O.; Yilmaz, M.In this study, three Schiff base ligands (N,N-Bis(2,5-dihydroxybenzylidene)-4,4- diaminodiphenylmethane (DHDPM), N,N-Bis(2,5-dihydroxybenzylidene)- 1,2- diaminoethane (DHSalen) and N,N-Bis(2,5-dihydroxybenzylidene)- 1,3-phenylenedimethanamine (DHSalomphen)) and their metal complexes were synthesized and characterized by infrared spectroscopy (IR), thermogravimetric analysis (TGA), nuclear magnetic resonance (H-1 NMR), fluorescence spectra, elemental analysis and magnetic susceptibility apparatuses. The antibacterial activity was also studied against Staphylococcus aureusATCC 29213, Streptococcus mutansRSHM 676, Enterococcus faecalisATCC 29212, Lactobacillus acidophilus RSHM 06029, Escherichia coli ATCC 25922 and Pseudomonas aeruginosaATCC 27853.Öğe CLINICAL MANAGEMENT AND QUALITY OF LIFE IN PATIENTS WITH HOMOZYGOUS FAMILIAL HYPERCHOLESTEROLEMIA UNDERGOING LIPID-APHERESIS IN TURKEY: FIRST RESULTS OF A NATION-WIDE SURVEY (A-HIT REGISTRY)(Elsevier Ireland Ltd, 2016) Kayikcioglu, M.; Tokgozoglu, L.; Pirildar, S.; Yilmaz, M.; Kaynar, L.; Aktan, M.; Durmus, R.[Abstract Not Availabe]Öğe Comparison of the results of percutaneous and open screw fixation in the treatment of scaphoid nonunion fractures(Verduci Publisher, 2022) Atilgan, N.; Duman, N.; Colak, T. S.; Korucu, I. H.; Demiryurek, M.; Yilmaz, M.OBJECTIVE: Our study aims to compare the clinical results of percutaneous screw fixation and non-vascularized bone graft-ing with open screw fixation in patients who did not achieve union due to failure in diagnosis and treatment after a scaphoid fracture. PATIENTS AND METHODS: Forty-three pa-tients with scaphoid nonunion fractures cor-responding to the first three Slade and Dodds classification were divided into two groups. Non-vascularized bone grafting with open re-duction and internal fixation (ORIF) was applied to 24 patients in the first group, and 19 patients in the second group were treated with a closed reduction and internal fixation (CRIF) (percu-taneous screw fixation). The patients were fol-lowed up for preoperative and postoperative functional scores and time to union.RESULTS: Our study found that the scaphoid was most commonly fractured in the waist of the scaphoid. In our study, we found that distal scaphoid fractures had the highest union rate (100%), followed by the waist fractures (93.2%) and the weakest union (50%) in the proximal pole fractures. We observed that the fastest union had occurred in the fractures of the waist. We also ob-served that the union was completed earlier in patients who operated with ORIF than those with CRIF. We found union in 87.5% of patients who underwent ORIF, in 84.2% of patients who under-went CRIF. CRIF operation duration was short-er than expected from ORIF operation duration.CONCLUSIONS: We found that similar union rates could be achieved in the patient groups who underwent percutaneous and open screw fixation by selecting the appropriate patient in scaphoid nonunion fractures. Union was faster and functional results were more satisfactory in the ORIF group. The operation time was shorter in the CRIF group.Öğe Design of an amorphous ZnWSe2 alloy-based counter electrode for highly efficient dye-sensitized solar cells(Royal Soc Chemistry, 2023) Ari, D. A.; Sezgin, A.; Unal, M.; Akman, E.; Yavuz, I.; Liang, F. C.; Yilmaz, M.One of the biggest obstacles in the commercialization of dye-sensitized solar cells (DSSCs) is the use of the very expensive and rare platinum (Pt) catalytic material as a reference counter electrode (CE). Since finding new CE materials for replacing the state-of-the-art Pt is still challenging, the discovery of low-cost CE materials with superior catalytic activity is of paramount importance. Here, innovative and effective ZnWSe2 alloy CE materials in the amorphous structure are designed with different Zn ratios by the magnetron sputtering route and employed in DSSC applications to overcome the above-mentioned challenges of Pt CE. The formation of an amorphous phase with various Zn contents is further verified using theoretical calculations. Various electrochemical measurements such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel demonstrate that the optimum ZnWSe2 (denoted as ZnWSe2-3) alloy-based CE material possesses superior electrocatalytic activity, electrochemical stability, and fast reaction kinetics for an iodide/triiodide (I-/I-3(-)) redox pair. Thanks to its low charge transfer resistance, high electrical conductivity, and large surface area, the cell employing ZnWSe2-3 CE reaches a power conversion efficiency (PCE) of 8.27% with enhanced short circuit current density (J(sc)) and fill factor (FF) parameters, which are higher than those of DSSCs based on Pt (7.56%), WSe2 (6.35%), and other ZnWSe2-based CEs (6.20 to 7.41%). In addition to its improved photovoltaic (PV) performance, the cell employing ZnWSe2-3 CE exhibits prolonged photostability under operational conditions. This facile and efficient approach provides a promising direction to fabricate high-efficiency and electrochemically stable DSSCs. We thus believe that our work could provide an effective alternative for the design of high-performance and low-cost CE materials for PV applications.Öğe Molecular structure and spectral investigations of 3,5-Di-tert-butyl-o-benzoquinone(Elsevier, 2017) Yilmaz, M.; Aydin, B.; Dogan, O.; Dereli, O.Conformational analysis of 3,5-Di-tert-butyl-o-benzoquinone molecule was performed and two stable conformers were determined by B3LYP/6-311++G(d,p). Using the most stable one, molecular structural parameters, vibrational frequencies were calculated by B3LYP/6-311++G(d,p), B3LYP/6-31G(d) and BLYP/6-31G(d,p) levels of theory. The FT-IR spectrum of the compound was recorded in the region 4000-550 cm(-1). The Raman spectrum was also recorded in the region 3500-100 cm(-1). Calculated results were compared with experimental counterparts. The best results were obtained from B3LYP/6-311++G(d,p) calculations. Experimental C-13 and H-1 NMR data of tittle compound were taken from literature and the calculated results compared with these data. Vibrational and NMR band assignments were performed. HOMO-LUMO energies, molecular electrostatic potentials and thermodynamic properties were also given for further investigations of our structure. (C) 2016 Elsevier B.V. All rights reserved.Öğe Structural and Morphological Properties of Al doped ZnO Nanoparticles(Iop Publishing Ltd, 2016) Akdag, A.; Budak, H. F.; Yilmaz, M.; Efe, A.; Buyukaydin, M.; Can, M.; Turgut, G.Zinc oxide nanoparticles have a wide area of use because of their unique properties such as catalytic, electrical, and optical properties and low cost. Since the suitable additive materials can be changed the electrical and optical properties of zinc oxide, the demand of the industrial commercial area to the zinc oxide increased. In this study, Al doped ZnO nanoparticles produced by using the methods of reduction thought having materials of the Zn(NO)(3), AlCl3 and NaOH. XRD, SEM and EDS used for making analyzing of structural and dimensional of particles. The analyses show that the large amount of the Al3(+) ions did nut substitute with Zn2(+) successfully with the reduction method. XRD and EDS results confirm this situation.Öğe Structural and superconducting properties in Y0.6Gd0.4Ba2(Nb)Cu3O7-y cuprates doped with niobium(Elsevier Science Bv, 2012) Yilmaz, M.; Dogan, O.Polycrystalline YBa2Cu3O7-y (YBCO) and Y0.6Gd0.4Ba2-xNbxCu3O7-y (YGBNCO) compounds with 0 <= x <= 0.225 were synthesized using standard solid state reaction technique. The structure for all samples was characterized by X-ray difference (XRD) and scanning electron microscopy (SEM). The transport properties were measured by the (FPP) method in the temperature range from 70 to 130 K. As the Nb content in the samples increased, a diffused phase indicating a niobium perovskite phase and a small amount of unidentified phase appeared. With the increase of Nb content, the superconducting transition temperature T-c(onset) increased slowly with x <= 0.125, and then it remained unchanged or slowly decreased with 0.125 <= x <= 0.225. It could be found that there was a slow decrease of zero-resistance temperature, T-c(offset), with the increase of Nb content. The larger transition width might result from the YBa2NbO6 phase, impurity and unidentified phases of the sample due to the Nb doping.