Browsing by Author "Özdemir, S."
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Article Alexander Type Primary Anetoderma: Case Report(2012) Güneş Bilgili, S.; Karadaǧ, A.S.; Çalka, Ö.; Bulut, G.; Özdemir, S.Anetoderma is a rare disease which is characterized by localized, atrophic, herniated macules caused by loss of elastic tissue in the skin. Anetoderma usually involves back, chest, neck upper parts of arms. Alexander-type anetoderma is a severe variant of primary anetoderma. Bullous lesions appears during its course and heals with postinflammatory lesions. A 20-year-old female patient admitted to our outpatient clinic with brown atrophic plaques located on the dorsum of both feet, lateral aspects of her right legs, extansor surfaces of both knees and elbows and on her buttocks for 6 years following preceding vesicles and bullae. The patient was diagnosed with Alexander-type anetoderma based on clinical and histopathologic findings. Our case has been reported because of the rarity of this type of anetoderma and atypical localization of its lesions. Copyright © 2012 by Türkiye Klinikleri.Article Antibacterial Activity of Copper-Decorated Ceo2 Nanoparticles and Preparation of Antifouling Polyethersulfone Surface(Elsevier Ltd, 2024) Şener, L.; Özdemir, S.; Yalçın, M.S.; Gülcan, M.; Dizge, N.Cerium oxide NPs (nano-CeO2), with notable performance in various biological tests like redox activity, free radical scavenging, and biofilm inhibition, emerge as significant candidates to address issues in related areas. In this research, copper-decorated nano-CeO2 (Cu@nano-CeO2) were first synthesized and then characterized using advanced techniques such as SEM-EDX, XRD, XPS, BET, and ICP-OES. The biochemical properties of the obtained Cu@nano-CeO2 nanostructure and its performance in polyethersulfone (PES) membranes were thoroughly investigated in this research study. The free radical scavenging effect of Cu@nano-CeO2 at 100 mg/L concentration was determined as 100 % with the same activity as the reference compounds Trolox and ascorbic acid. It enhanced 2.9-fold α-amylase enzyme activity at 50 mg/L. Plasmid DNA was completely degraded at 100 mg/L concentration. Cu@nano-CeO2 provided significant inhibition against tested bacterial and fungal strains, especially Gram-positives than Gram-negatives and fungus. Anti-biofilm activity was determined against S. aureus and P. aeruginosa as 98.3 and 82.1 %, respectively. Furthermore, E. coli inhibition activity of PES/Cu@nano-CeO2 1.0 wt% membrane was determined as 100 %. Owing to the promising results obtained, we can suggest that Cu@nano-CeO2 can be used in wastewater treatment. © 2024 The AuthorsArticle Polyethersulfone Membranes Modified With 2D Mxene-Cuo Nanocomposites for Protein Rejection and Investigation of Antimicrobial Properties(Elsevier B.V., 2025) Şener, L.; Alterkaoui, A.; Özdemir, N.C.; Dizge, N.; Özdemir, S.; Serkan Yalçın, M.; Gülcan, M.This study examines the effects of incorporating three MXene-CuO nanocomposites – Ti3C2Tx/CuO, V2CTx/CuO and Nb2CTx/CuO- into polyethersulfone (PES) membranes. The study aims to enhance the antifouling and permeation properties of PES membranes for bovine serum albumin (BSA) filtration. The experimental design involved adding each MXene-based composites to PES membranes at a fixed concentration of 1 %. These composite membranes were then evaluated using a dead-end filtration system. Their performance was compared to that of a control membrane composed of pure PES without any MXene-based nanocomposites. The results revealed significant improvements in BSA rejection efficiency. The pristine PES membrane achieved a rejection rate of 61.42 %, while the three composite membranes containing MXene-based nanocomposites showed complete BSA rejection, achieving 100 % removal efficiency. The synthesized MXene-based nanocomposites were also assessed for in vitro antioxidant, antidiabetic, DNA nuclease, antibiofilm and antimicrobial activities. V2CTx/CuO exhibited 90.27 % antioxidant activity. Antidiabetic activity of V2CTx/CuO and Ti3C2Tx/CuO was achieved as 86.42 % and 96.46 %. All compounds caused single-strand DNA cleavage at 50 and 100 mg/L doses and double-strand cleavage caused at 200 mg/L dose. The low MIC values obtained revealed that the compounds presented effective antibacterial properties. V2CTx/CuO, Nb2CTx/CuO and Ti3C2Tx/CuO was also displayed influential microbial growth inhibition as 82.79 %, 98.62 % and 100 %, respectively. The highest antibiofilm activity against S. aureus and P. aeruginosa for V2CTx/CuO, Nb2CTx/CuO and Ti3C2Tx/CuO was 71.25 % and 56.85 %; 87.91 % and 69.16 %; and 92.55 % and 84.22 %, respectively. It was also found that the antimicrobial surface of PES membrane doped with 1 % V2CTx/CuO, Nb2CTx/CuO and Ti3C2Tx/CuO displayed 72.58 %, 84.62 %, and 95.49 % antibacterial ability, respectively. © 2025 Elsevier B.V.Article Stability Analysis of Some Large Seeded Chickpea Genotypes in Çukurova Region(TUBITAK, 1996) Özdemir, S.; Engin, M.Fourteen chickpea cultivars were tested for grain yield in Çukurova ecological conditions, over a period of five consecutive years to classify tehese cultivars for yield stability. Some variety were performed better in favorable climatic conditions, while other were very sensitive to unfavorable conditions. FLIP 85-1C, FLIP 85-14C. FLIP 85-15C and FLIP 85-135C had regression coefficients of 1.231, 1,138, 1.185 and 1,382 respectively. These cultivars were thus considered to be specificaly adapted to favorable environments. FLIP 84-17C. FLIP 84-18C. FLIP 85-56C. FLIP 85-60C had regression coefficients of less than one, indicating specific adaptation to unfavorable environments. The remeander of the cultivars (FLIP 84-19C, FLIP 85-4C, FLIP 85-16C, FLIP 85-46C, FLIP 85-55C) had regression coefficients close to one. These cultivars were best adapted to all environments. Of the high yielding cultivars FLIP 85-14C were rather sensitive to changing environment. FLIP 85-15C were responsive to high yielding environment and FLIP 85-55C was relatively more stable than the rest of the cultivars.Article Synthesis of Tetra 3,4-Dimethoxyphenethoxy Peripheral Substituted Metallophthalocyanines and Investigation of Some Properties(Wiley-Blackwell, 2018) Ağırtaş, M.S.; Solğun, D.G.; Özdemir, S.; İzgi, M.S.The synthesis and characterization of tetra 3,4-dimethoxyphenethoxy substituted cobalt, zinc and copper phthalocyanines are reported. These compounds have been characterized by using electronic absorption, nuclear magnetic resonance spectroscopy, infrared spectroscopy, and elemental analysis. The aggregation behaviors were investigated in different concentrations phthalocyanine complexes. The photodegradation stabilities of pthalocyanine complexes 4–6 were determined in THF. The antioxidant activities of scavenging effect on 1,1-Diphenyl-2-picryl-hydrazyl (DPPH) radicals and ferrous chelating reducing power were also investigated. The antimicrobial effects of compounds were evaluated. In addition, DNA cleavage activities of the ligand and its phthalocyanine complexes were experimented on plasmid DNA (pBR322) using DNA gel electrophoresis and the complexes exhibited promising cleavage activity. Thermal properties of compounds were determined by thermogravimetric analysis(TG) and differential thermal analysis (DTA). © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimArticle Transition Metal (Ii) Complexes With a Novel Azo-Azomethine Schiff Base Ligand: Synthesis, Structural and Spectroscopic Characterization, Thermal Properties and Biological Applications(Springer New York LLC, 2017) Yeğiner, G.; Gülcan, M.; Işık, S.; Ürüt, G.Ö.; Özdemir, S.; Kurtoğlu, M.The pyrimidine based azo-linked Schiff base ligand, 5-benzoyl-1-((E)-(2-hydroxy-3-methoxy-5-((E)phenyldiazenyl)benzylidene)amino)-4-phenylpyrimidin-2(1H)-one (HL), and its transition metal (II) complexes were synthesized and defined by using 1H-NMR, 13C-NMR, Elemental analysis, FT-IR, MS, UV–vis, molar conductance, magnetic susceptibility and thermal analysis techniques. According to the conductance data obtained indicate all of the metal complexes have non-electrolytic nature. Square pyramidal geometry for Pd(II) and octahedral geometry for all the other complexes synthesized was concluded from the electronic absorption spectra and magnetic susceptibility measurements of the complexes. Investigation of the significant infrared bands of the active groups in the ligand and the solid complexes alludes that HL is coordinated to the metal ions ONO tridentate manner. Moreover, the absorption and emission properties of the azo-azomethine based ligand and its complexes were investigated. The results obtained show that fluorescence emissions of the ligand and its metal (II) complexes depend on the type of transition metal ions and the derivatives displayed moderate Stokes’ shift values between 44 and 107 nm. All the compounds exhibited superb photostability. Further, antioxidant, antimicrobial and pBR322 plasmid DNA cleavage activities were investigated. All compounds showed good DPPH• (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity and complexes of [MnL2]•H2O and [NiL2]•H2O exhibited excellent metal chelating activity. All the compounds tested demonstrated two strand DNA cleavage activities. © 2017, Springer Science+Business Media, LLC.