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Articles by Sengul ALPAY KARAOGLU
Total Records ( 2 ) for Sengul ALPAY KARAOGLU
  Yasemin UNVER , Esra DUGDU , Kemal SANCAK , Mustafa ER and Sengul ALPAY KARAOGLU
  A series of novel di-[3(thiophen-2-yl-methyl)-4,5-dihydro-1H- [1,2,4]triazole-5-one-4yl]n-alkanes (2a-h) were obtained by the reaction of N'-1-ethoxy-2-thiophen-2-yl-ethylydene hydrazino carboxylic acid ethyl ester (1) and diamines. Compound 3 was reacted with aldehydes and 4-(arylidene-amino)-3-thiophen-2-yl-methyl-4,5-dihydro-1H-[1,2,4] triazole-5-ones (4, 5, and 8) with Schiff base character were synthesized. (4-(arylidene-amino)-5-oxo-3-thiophen-2-yl-methyl-4,5- dihydro-1H-[1,2,4]triazole-1-yl)-acetic acid ethyl esters (6, 7, and 9) were obtained by the reaction of 4-(arylidene-amino)-3-thiophen-2-yl- methyl-4,5-dihydro-1H-[1,2,4]triazole-5-ones (4, 5, and 8) and ethyl bromoacetate. The structures of the new compounds were inferred through IR, 1H/13C NMR, elemental analyses, and mass spectral data. Compound 8i was characterized by IR, 1H/13C NMR, elemental analyses, mass, and X-ray spectral techniques. Geometry optimization of compounds 2a, 2c, 2f, 4, and 5 was achieved by computer using the AM1 method. Compounds 2f, 4, 5, 6, 7, 8i, and 9k showed good antifungal activity only against yeast fungi, while compound 2d showed antimicrobial activity against the bacteria Pseudomonas aeruginosa ATCC10145, Enterococcus faecalis ATCC29212 and the yeast fungi Candida albicans ATCC 60193 and Candida tropicalis ATCC 13803.
  Osman UCUNCU , Tayyibe Beyza CANSU , Turan OZDEMIR , Sengul ALPAY KARAOGLU and Nurettin YAYLI
  The essential oils of mosses [Tortula muralis Hedw. (Pottiaceae), Homalothecium lutescens (Hedw.) H. Rob. (Brachytheciaceae), Hypnum cupressiforme Hedw. (Hypnaceae), and Pohlia nutans (Hedw.) Lindb. (Mniaceae)] were investigated by means of GC-FID/MS techniques. The major components were nonanal (18.3%) and tetradecanol (4.3%) in the oil of T. muralis, nonanal (36.8%) and tricosane (6.5%) in the oil of H. lutescens, nonanal (12.5%) and 2E-tetradecen-1-ol (6.9%) in the oil of H. cupressiforme, and nonanal (7.8%) and 2E-tetradecen-1-ol (7.1%) in the oil of P. nutans. The essential oils of T. muralis, H. lutescens, H. cupressiforme, and P. nutans were rich as in non-terpenoid components as aldehydes (26.9%, 50.9%, 15.6%, and 33.4%, respectively) and in terpenoid components as sesquiterpene hydrocarbons (6.7%, 11.0%, 12.7%, and 15.3%, respectively). The amounts and the numbers of terpenoids present in the investigated mosses are generally smaller than those in non-terpenoids. The isolated essential oils of T. muralis, H. lutescens, H. cupressiforme, and P. nutan were tested for antimicrobial activity against the bacteria Escherichia coli, Yersinia pseudotuberculosis, Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, and Bacillus cereus, and the fungi Candida albicans and Saccharomyces cerevisiae at a maximum essential oil concentration of 27,000-65,000 μ g/mL in hexane, respectively, and they showed antimicrobial activity only against the fungi.
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