Yazar "Dicle, I. Yesim" seçeneğine göre listele

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    Öğe
    The effect of gamma radiation of amino acid derivatives in the solid state: an EPR study
    (Taylor & Francis Ltd, 2014) Dicle, I. Yesim; Osmanoglu, S.
    The spectroscopic features of free radicals produced in gamma irradiation of the N-methyl-dl - alanine, N,N - dimethyl glycine hydrochloride and d - (+) - galactosamine hydrochloride were investigated at room temperature at the dose 15 kGy using EPR technique. The paramagnetic species observed in these compounds were identified as CH3CHCOOH, CHOH(CHOH)(3)NH2(CH)(2)O, and (CH3)(2)NCHCOOH.HCl, respectively. A comparison with a new paramagnetic species recently observed and characterized in irradiated amino acids indicates that the new radical presented here has a similar structure. In this paper, we have also studied the stability of these compounds at room temperature after irradiation.
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    Electron paramagnetic resonance of some ?-irradiated amino acid derivatives
    (Walter De Gruyter Gmbh, 2006) Zincircioglu, S. Burhanedtin; Canoruc, Naime; Osmanoglu, Semsettin; Baskan, M. Halim; Dicle, I. Yesim; Aydin, Murat
    gamma-Irradiated powders of N-acetyl-L-arginine, N-alpha-carbamyl-L-arginine, N-glycyl-L-leucine and glycyl-L-alanine were investigated at room temperature by electron paramagnetic resonance. The observed species in N-acetyl-L-arginine and Na-carbamyl-L-arginine were attributed to the CH2CHNHCNHNH2 radical, and those in N-glycyl-L-leucine and glycyl-L-alanine powders to (CH3)(2)(CCH2 and CH3CHCOOH radicals.
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    Öğe
    Radiation damage produced in powder of ?-(methylamino)isobutyric acid, ?-aminoisobutyric acid methyl ester hydrochloride and diethylmalonic acid
    (Taylor & Francis Ltd, 2009) Baskan, M. Halim; Osmanoglu, Semsettin; Dicle, I. Yesim
    The electron paramagnetic resonance spectra of gamma-irradiated powders of alpha-(methylamino) isobutyric acid - CH(3)NHC(CH(3))(2)COOH, alpha-aminoisobutyric acid methyl ester hydrochloride - NH(2)(CH(3))(2)CCOOCH(3) HCl, and diethylmalonic acid - (CH(3)CH(2))(2)C(COOH)(2) have been investigated at room temperature. It has been found that gamma-irradiation produces the (CH(3))(2)(C) over dotCOOH radical in the first, the (CH(3))(2)(C) over dotCOOCH(3) radical in the second and the (CH(3)CH(2))(2)(C) over dot COOH radical in the third compound. The spectra were computer-simulated. The g values and the hyperfine coupling constants of the unpaired electron with the environmental methyl, methylene protons and OH proton were determined. The results were found to be in good agreement with the existing literature data and theoretical predictions.
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    Öğe
    Radiation damage produced in single crystal of iminodiacetic acid hydrobromide
    (Elsevier, 2010) Aydin, Murat; Osmanoglu, Semsettin; Baskan, M. Halim; Dicle, I. Yesim
    Single crystals of iminodiacetic acid hydrobromide, H2N(CH2COOH)(2)center dot Br, were gamma-irradiated and the formed paramagnetic species were investigated at room temperature and analyzed for different orientations of the crystal in the magnetic field by electron paramagnetic resonance technique. The observed species in iminodiacetic acid hydrobromide single crystals were attributed to the H2NCHCH2(COOH)(2)center dot Br radical. The g values and hyperfine coupling constants of the unpaired electron with the environmental alpha-proton, methylene protons, and one proton of the NH2, and N-14 nucleus were determined. The results were found to be in good agreement with the existing literature data. (C) 2010 Elsevier B.V. All rights reserved.
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    Öğe
    Structure and behaviour of the free radicals generated in gamma irradiated amino acid and iminodiacetic acid derivatives
    (Pergamon-Elsevier Science Ltd, 2011) Osmanoglu, Semsettin; Aydin, Murat; Osmanoglu, Y. Emre; Dicle, I. Yesim; Baskan, M. Halim
    An EPR study has been carried out to investigate the structure and behaviour of the free radical formed gamma-irradiated L-alaninamide hydrochloride, DL-glutamic acid monohydrate and N-(2-carboxyethyl) iminodiacetic acid powders at room temperature. The observed paramagnetic species have been attributed to the CH3CHCONH2, HOOCCH2CH2CHCOOH and HOOCCH2CH2NCHCH2(COOH)(2) radicals, respectively. Some spectroscopic properties and suggestions concerning possible structure of the radicals were also discussed in this study. Published by Elsevier B.V.