Yazar "Uyar, Zafer" seçeneğine göre listele

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    Ebenus haussknechtii (Leguminosae)nın izolasyonu, yapı belirlenmesi ve biyolojik aktivitesi
    (Çanakkale Onsekiz Mart Üniversitesi, 2004) Uyar, Zafer; Kırmızıgül, Süheyla
    ÖZETTürü belirlendikten sonra kurutulan ve öğütülen Ebenus haussknechtiiLeguminosae) bitkisi kimyasal ve mikrobiyolojik olarak incelendi. Polar ve apolarkısımları ekstraksiyonla birbirinden ayrıldı. Bu şekilde polaritelerine goresınıflandırılmış olan fraksiyonlar çeşitli kromotografik yöntemler (CC, PLC, TLC)kullanılarak bileşenlerine ayrılıp saflandırıldı İzolasyon ve saflandırma tekniklerisonrası, 4 ünün yapısı aydınlatılan 6 doğal bileşik elde edildi. Ayrıca, metillenen heksanekstresinin GC ve GC-Mass analiz sonuçları faydalı yağ asitleri açısından irdelendi.Saf bileşiklerin yapı aydınlatılması çeşitli kimyasal, kromotografik vespektroskopik [IR, UV, NMR (1D ve 2D), ve Mass] yöntemler kullanılarak yapıldı.Kromotografik ve spektroskopik veriler yorumlandıktan sonra bileşiklerin spesifikçevirme açıları ölçüldü.Çalışmada elde edilen ekstrelerin (MeOH, Heksan, CH2Cl2, BuOH ve H2O)antimikrobiyel aktiviteleri, agar-disk difüzyon yöntemiyle, Gentamycine (Referansantibiotik) ile karşılaştırılarak çeşitli bakteri ve mantarlara karşı incelendi.80
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    Öğe
    Synthesis, characterization and catalytic, cytotoxic and antimicrobial activities of two novel cyclotriphosphazene-based multisite ligands and their Ru(II) complexes
    (Wiley, 2015) Cirali, Digdem Erdener; Uyar, Zafer; Koyuncu, Ismail; Hacioglu, Nurcihan
    Two novel cyclotriphosphazene ligands (2 and 3) bearing 3-oxypyridine groups and their corresponding Ru(II) complexes (4 and 5) were synthesized and their structures were characterized using Fourier transform infrared, H-1 NMR and P-31 NMR spectroscopic data and elemental analysis. The Ru(II) complexes were used as catalysts for catalytic transfer hydrogenation of p-substituted acetophenone derivatives in the presence of KOH. Additionally, the cytotoxic activities of compounds 2, 3, 4, 5 were evaluated against PC3 (human prostate cancer), DLD-1 (human colorectal cancer), HeLa (human cervical cancer) and PNT1A (normal human prostate) cell lines. Finally the antimicrobial activities of compounds 2, 3, 4, 5 were evaluated against a panel of Gram-positive and Gram-negative bacteria and yeast cultures. The complexes showed efficient catalytic activity towards transfer hydrogenation of acetophenone derivatives, especially those bearing electron-withdrawing substituents on the para-position of the aryl ring. The compounds were found to have moderate to high cytotoxic and antimicrobial activities, and Ru(II) complexation enhanced both cytotoxic and antimicrobial activities in comparison with the parent compounds. Copyright (c) 2015 John Wiley & Sons, Ltd.
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    Öğe
    Synthesis, Characterization, and Cytotoxic Activities of a Schiff Base Ligand and Its Binuclear Copper(II) and Manganese(III) Complexes
    (Turkish Chemical Society, 2017) Uyar, Zafer; Erdener, Diğdem; Koyuncu, İsmail; Arslan, Ülkü
    A novel symmetrical N2O2 type Schiff base (1) and its copper (II) (2) and manganese (III) (3) complexes were synthesized and characterized by spectroscopic, analytical, and magnetic susceptibility studies. Spectroscopic and magnetic susceptibility studies suggested that copper and manganese ions are in 2+ and 3+ states and their complexes have a binuclear double stranded helical structure in the form of 2:2 (metal to ligand) stoichiometry. Cytotoxic effects of the ligand and its metal complexes against MCF-7 (human breast cancer cell line), DLD-1 (human colorectal cancer cell line), ECC-1 (human endometrium cancer cell line), DU-145 (human prostate cancer line), MDA-MB231 (human breast cancer cell line), PC-3 (human prostate cancer line) and HEK293 (normal cells) were evaluated by determining their cellular viability using the colorimetric 3-(4,5- dimethylthiazole-2-yl)-2,5-biphenyl tetrazolium bromide (MTT) assay. It has been found that cytotoxicity of the ligand was significantly enhanced towards cancer cells and declined towards normal HEK293 cells by metal chelation. Copper complex yielded better results in comparison with manganese complex. Particularly, copper complex showed a selective cytotoxicity, harming the cancerous cell lines while not impairing the normal cells, which is considered as the key to the future of cytotoxic therapy.