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'y Irradiation' in keywords Facet   section ZfN Section B  [X]
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1983 (1)
1981 (1)
1978 (1)
1Author    Nien Man, Clemens Schuchmann, Von SonntagRequires cookie*
 Title    Free Radical Induced Oxidation of Neutral Aqueous Solutions of D-Glucose in the Presence of Oxygen -a Non-Chain Process  
 Abstract    Oxygenated 1 M aqueous solutions of 2-methyltetrahydrofuran (MTHF) or D-glucose were y-irradiated, and G(total peroxide) was determined as a function of dose rate and temperature. Whereas MTHF was oxidized by a chain process, D-glucose was not. The peroxyl radicals derived from D-glucose rapidly eliminate H02". At natural pH H02' (pK = 4.75) is largely deprotonated. O2— does not propagate a chain. 
  Reference    Z. Naturforsch. 33b, 329—331 (1978); received November 25 1977 
  Published    1978 
  Keywords    Autoxidation, D-Glucose, 2-Methyltetrahydrofuran, a-Hydroxyalkylperoxyl Radicals, y-Irradiation 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0329.pdf 
 Identifier    ZNB-1978-33b-0329 
 Volume    33 
2Author    J. Cadet, L. Voituriez, M. Berger, L. S. MyersRequires cookie*
 Title    Radiation-Induced Degradation of Purine and Pyrimidine 2'-Deoxyribonucleosides in Aqueous KBr Solutions  
 Abstract    Steady-state y-radiolysis of 5 x 10 -4 M pyrimidine and purine 2'-deoxyribonucleosides in aqueous solutions saturated with N2, N2O and O2, respectively, have been carried out in the presence of 0.1 M KBr. The main final degradation products have been isolated and characterised by various spectroscopic measurements including !H and 13 C NMR, UV, C.D. and mass spectrometry. The radiation-induced decomposition of thymidine is mostly accounted for by an ionic mechanism involving Br2, the decay product of Br2 --, as the reactive oxidising specie. On the other hand the degradation of the purine ring of 2'-deoxy-adenosine and 2'-deoxyguanosine may be accounted for by the action of Br2 --or Br3-2_ . 
  Reference    Z. Naturforsch. 38b, 1643—1651 (1983); received August 4/July 28 1983 
  Published    1983 
  Keywords    2'-Deoxyribonucleosides, Inorganic Radical, y-Irradiation, Radical Reactions, Thymidine Oxidation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1643.pdf 
 Identifier    ZNB-1983-38b-1643 
 Volume    38 
3Author    Henryk Zegota++, Clemens Von SonntagRequires cookie*
 Title    Radical-Induced Dephosphorylation of Fructose Phosphates in Aqueous Solution +  
 Abstract    Oxygen free N20-saturated aqueous solutions of D-fructose-1-phosphate and D-fructose-6-phosphate were y-irradiated. Inorganic phosphate and phosphate free sugars (containing four to six carbon atoms) were identified and their G-values measured. D-Fructose-1-phosphate yields (G-values in parentheses) inorganic phosphate (1.6), hexos-2-ulose (0.12), 6-deoxy-2,5-hexodiulose (0.16), tetrulose (0.05) and 3-deoxytetrulose (0.15). D-Fructose-6-phosphate yields inorganic phosphate (1.7), hexos-5-ulose (0.1), 6-deoxy-2,5-hexodiulose (0.36), 3-deoxy-2,5-hexodiulose and 2-deoxyhexos-5-ulose (together 0.18). On treatment with alkaline phosphatase further deoxy sugars were re-cognized and in fructose-1-phosphate G(6-deoxy-2,5-hexodiulose) was increased to a G-value of 0.4. Dephosphorylation is considered to occur mainly after OH attack at C-5 and C-l in fructose-1-phosphate and at C-5 and C-6 in fructose-6-phosphate. Reaction mechanisms are discussed. 
  Reference    Z. Naturforsch. 36b, 1331—1337 (1981); received May 29 1981 
  Published    1981 
  Keywords    D-Fructo8e-l-phosphate, D-Fructose-6-phosphate, y-Irradiation, Radical Reactions, Mass Spectrometry 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1331.pdf 
 Identifier    ZNB-1981-36b-1331 
 Volume    36