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    Öğe
    (3, 3-Dichloro-1, 4-Diphenyl-2-Azetidinone)
    (Int Union Crystallography, 1999) Guven, K.; Durlu, T. N.; Kabak, M.; Guner, V.
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  • [ X ]
    Öğe
    (3,3-Dichloro-4-(P-Methoxyphenyl)-1-(P-Chlorophenyl)-2-Azetidinone)
    (Int Union Crystallography, 1999) Durlu, T. N.; Guven, K.; Kabak, M.; Guner, V.
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    Crystal and molecular structure of 3-phenyl-4-(p-chlorobenzylamino)-4,5-dihydro-1-H-1,2,4-triazol-5-on
    (Wiley-V C H Verlag Gmbh, 2004) Yilmaz, V.T.; Agar, E.; Guven, K.; Kahveci, B.; Sasmaz, S.
    The structure of the title compound, C15H13N4OCl was determined by single crystal X-ray diffraction technique. The structure consists of a p-chlorobenzylamino moiety and triazol and phenyl rings. The title compound crystallizes in the monoclinic space group P2(1)/c with a = 14.368(3), b = 6.255(3), c = 17.631(3) Angstrom, beta = 113.24(3)degrees, Z = 4, V = 1455.8(8) Angstrom(3) and D-x = 1.372 gcm(-3). The structure was solved by direct methods and refined by full-matrix least-squares method (R=0.0477). The dihedral angle between the triazole moiety and the phenyl ring is 28.8(3)degrees. The molecular packing is stabilized by N-(HN)-N-... and N-(HO)-O-... types of inter molecular hydrogen bonds.
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    Öğe
    Crystal structure of 1-ferrocenyl-(3-methyl-1-phenyl-aziridin-2-yl)- methanone, (C5H5)Fe(C16H16NO)
    (R. Oldenbourg Verlag GmbH, 2005) Bulut, A.; Guven, K.; Dogan, O.; Zeytinci, S.
    C21H21FeNO, monoclinic, P121/a1 (no. 14), a = 7.329(7) Å, b= 17.343(3) Å, c = 13.618(5) Å, ? = 95.02°, V = 1724.3 Å3, Z = 4, Rgt(F) = 0.044, wRref(F2) = 0.111, T = 293 K. © by Oldenbourg Wissenschaftsverlag.
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    Crystal structure of cis,cis,cis-1,2-epoxy-3,5-dibromo-4-hydroxy tetralin
    (Wiley-V C H Verlag Gmbh, 2003) Celik, I.; Demirtas, I.; Akkurt, M.; Erenler, R.; Guven, K.; Cakmak, O.
    The title compound, C10OH8Br2O2, consists of a tetrahydronaphthalene skeleton composed of a six-membered ring A with arene oxide, monobromo and monohydroxy atoms in cis,cis,cis configuration held in a boat conformation and a six-membered planar ring B, where the ring B carries monobromo atom. The repulsive interactions between the Br and OH atoms affect the topology of the tetrahydronaphthalene moieties.
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    Morphological changes in diseased cementum layers: A scanning electron microscopy study
    (Springer, 2004) Bilgin, E.; Gurgan, C.A.; Arpak, M.N.; Bostanci, H.S.; Guven, K.
    The aim or this study was to compare the morphological changes that occurred in root cementum layers due to periodontal disease by using scanning electron microscopy (SEM). Ninety-two periodontally hopeless teeth extracted from 29 patients were studied. Measurements of probing depth (PD) and clinical attachment loss (CAL) were taken prior to extractions. After the longitudinal fracturing process of root specimens, healthy and diseased cementum layers of roots were evaluated by SEM for the thickness of the cementum and the morphological changes in collagen fibers. The result of SEM evaluation revealed a significant (P < 0.001) decrease in the thickness of cementum layer on the diseased root surfaces compared to the healthy surfaces. There were denser and conspicuous Collagen fibers with their interfibrillar matrix in cementum layers on the healthy root surfaces compared to the diseased surfaces. Within the limits of this study, the thickness of cementum layers in diseased areas was found to be Significantly less than that in the healthy areas of root surfaces. However, there exist variations in the density and visibility of cemental fibers between individuals and within the individual.