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1978 (2)
1974 (1)
1Author    Egon Fahr, Georg Ph, Roth, Peter WüstenfeldRequires cookie*
 Title    Die gas-chromatographische Untersuchung der bei der UV-Bestrahlung von Uracil und Thymin in Lösung und in der Eismatrix gebildeten Produkte* Gas-chromatographic Investigation of Products Formed by UV Irradiation of Uracil and Thymine in Solution and Ice Matrix  
 Abstract    By g£is-chromatographic analysis of products prepared by UV irradiation of uracil in water, acetonitrile or ice matrix resp. of thymine in actonitrile could be demonstrated, that in all cases all four cyclobutane dimers are formed. 
  Reference    Z. Naturforsch. 33b, 646—651 (1978); eingegangen am 6. Dezember 1977 
  Published    1978 
  Keywords    UV, Uracil, Thymine 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0646.pdf 
 Identifier    ZNB-1978-33b-0646 
 Volume    33 
2Author    Wolfgang LohmannRequires cookie*
 Title    Halogen-Substitution Effect on the Optical Absorption Bands of Uracil"  
 Abstract    The ultraviolet absorption spectra of uracil and its 5-halogenated derivatives have been in ­ vestigated in regard to the electron attracting properties of the substituents. It could be shown that the position of the two absorption bands is proportional to the inverse of the electronegativity; the extinction coefficients are a linear function of the electron affinities. In this way, the red shift obtained upon substitution with halogens can be explained. Also, the decrease in absorbance of the absorption bands at A > 2 5 0 nm, occuring concomitant­ ly, is understandable. The increase in absorbance with increasing electron affinity, as observed in the case of the absorption bands at 2 < 2 50 nm, due to a higher pi —pi* excitation. 
  Reference    (Z. Naturforsch. 29c, 493 [1974]; received March 18/April 26 1974) 
  Published    1974 
  Keywords    Halogen Effect, Absorption Bands, Uracil, Electron Affinity, Electronegativity 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0493.pdf 
 Identifier    ZNC-1974-29c-0493 
 Volume    29 
3Author    E. Šimaga, KosRequires cookie*
 Title    Š  
 Abstract    Experiments designed to elucidate the mechanism of uracil degradation by E. coli K12S showed that in contrast to uracil, dihydrouracil — the postulated intermediate of a reductive mechanism — did not stimulate the growth of bacteria as additional source of nitrogen, nor it was cata-bolized to ureido carbon dioxide. However, the chromato­ graphic analysis of dihydrouracil metabolic products, re­ vealed the presence of an enzyme converting dihydrouracil to /?-ureidopropionic acid. Results of growth and biochemi­ cal studies indicated that barbituric acid — the postulated intermediate of an oxidative pathway — is not involved in uracil degradation. 
  Reference    Z. Naturforsch. 33c, 1006 (1978); received August 4 1978 
  Published    1978 
  Keywords    Escherichia coli, Catabolism, Uracil, Dihydrouracil, Barbituric Acid 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-1006_n.pdf 
 Identifier    ZNC-1978-33c-1006_n 
 Volume    33