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1978 (2)
1Author    Julio Maranon, OscarM. SorarrainRequires cookie*
 Title    Polarization, Isopotential Maps and Tunneling in Guanine, Cytosine, and Tautomeric Forms  
 Abstract    We have used the CNDO/2-CI method to calculate the isopotential maps for the fundamental state and the direction of the polarizations corresponding to several singlet transitions in the mole­ cules of guanine, cytosine and tautomeric forms. We have also calculated the times for proton tunneling and equilibrium constants between both conformers corresponding to the fundamental and some excited states. The results have been compared with the available experimental data. 
  Reference    Z. Naturforsch. 33c, 23 (1978); received November 2 1977 
  Published    1978 
  Keywords    Polarization, Isopotential, Tunneling, Guanine, Cytosine 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0023.pdf 
 Identifier    ZNC-1978-33c-0023 
 Volume    33 
2Author    Alfred Hissung, Clemens Von SonntagRequires cookie*
 Title    Radiolysis of Cytosine, 5-Methyl Cytosine and 2'-Deoxycytidine in Deoxygenated Aqueous Solution A Pulse Spectroscopic and Pulse Conductometric Study of the OH Adduct  
 Abstract    Using the pulse radiolysis technique the OH adducts of cytosine, 5-methyl cytosine and 2'-deoxycytidine were investigated in alkaline N20 saturated aqueous solutions. Ab-sorption spectra were recorded and their change with time was correlated with the change in conductivity. An OH -induced reaction (1.4 • 10 8 1 • mol -1 • s -1) was observed with OH adducts of cytosine and 5-methyl cytosine leading to radicals (pK = 10.3), the G-values of which were 3.2 and 1.6 respectively (conductivity measurements). These intermediates were assigned to the C-5 OH radical adducts. After completion of the free radical reactions (2k = 6 • 10 8 1 • mol -1 • s -1) the resulting product mixture showed pK-values of 8.3 (cytosine, G = 0.6), 10.5 (5-methyl cytosine, G = 0.8), 10.7 (cytosine, G=1.5; 2'-deoxycytidine, G=1.5) and 12.4 (cytosine, no G-value, determinable with optical detection). Ammonia, which is a product measured after y-radiolysis of all the three compounds investigated (G(NHs) = 0.6 ± 0.1), is not released within 15 ms after the pulse. 
  Reference    Z. Naturforsch. 33b, 321—328 (1978); received November 25 1977 
  Published    1978 
  Keywords    Cytosine, G-Values, pK-Values, Absorption Spectra, Pulse Radiolysis 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0321.pdf 
 Identifier    ZNB-1978-33b-0321 
 Volume    33