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2001 (1)
1991 (1)
1981 (1)
1Author    KenjiM. Onde, Mitsuo Takasugi, JennyA. Lewis, G.Roger FenwickRequires cookie*
 Title    Time-Course Studies of Phytoalexins and Glucosinolates in UV-Irradiated Turnip Tissue  
 Abstract    Sliced turnip root (Brassica campestris L. ssp rapa) was irradiated for a total o f 20 min with a 15 W germicidal lamp and the tissue incubated at 25 °C. The effects o f such treatment on indole phytoalexins (methoxybrassinin (I); brassinin (II); cyclobrassinin (III); spirobrassinin (IV) and glucosinolates were determined using high performance liquid chromatography procedures. Accumulation o f phytoalexins I-I I I was evident within 8 h o f irradiation, whilst form ation o f spirobrassinin was evident only after 24 h. M aximal levels o f III and IV (> 100 |ig g " 1 freeze dried tissue) were greater than those o f I and II (27 and 17 jag g ~ \ respec­ tively). The individual glucosinolate levels were affected in a complex manner; whilst most glu-coinolates decreased on storage, the levels o f indole glucosinolates, glucobrassicin (XI) and 1-methoxyglucobrassicin (XIII), increased until 5 to 6 days after irradiation and thereafter declined. Whilst structural features o f I-IV , XI and XIII suggest close biosynthetic relation­ ships between these classes o f biologically-active indoles, further studies are needed to estab­ lish this point unambiguously. 
  Reference    Z. Naturforsch. 46c, 189—193 (1991); received October 11 1990/February 4 1991 
  Published    1991 
  Keywords    G lucosinolate, Phytoalexin, Turnip, UV Irradiation 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0189.pdf 
 Identifier    ZNC-1991-46c-0189 
 Volume    46 
2Author    Irina Petkova, ApostolosJ. Maroulisa, Constantina Hadjiantoniou-Maroulis3, Peter NikolovRequires cookie*
 Title    Electronic Spectral Investigations upon the Photochemical Transformations of Some Substituted l-(N,N-bisacyl)amino-4,5-diphenyl-l,2,3-triazoles  
 Abstract    The objective of this report is to investigate the steady state and dynamic photophysical and photochemical properties o f l-(N,N-bisacyl)amino-4,5-diphenyl-1,2,3-triazoles in solvents o f dif­ ferent polarity at room temperature and in frozen matrix at 77 K. On the basis o f the comparison of their UV absorption and luminescence spectra with those of 4,5-diphenyl-1,2,3-triazole and diben-zamide (model compounds), cleavage o f the N-N bond in the title compounds after irradiation with polychrome UV light is proved. 
  Reference    Z. Naturforsch. 56a, 452 (2001); received May 14 2001 
  Published    2001 
  Keywords    l-(N ,N-bisacyl)am ino-1,2,3-triazoles, Absorption, Luminescence, UV Irradiation, N-N Bond Cleavage 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0452.pdf 
 Identifier    ZNA-2001-56a-0452 
 Volume    56 
3Author    Egon Fahr, Peter FecherRequires cookie*
 Title    Die Darstellung von 1.3-Dunethyl-6-hydroxy-dihychothymin durch photochemische Wasser-Addition an 1.3-Dimethyl-thymin + Preparation of 1,3-Dimethyl-6-hydroxy-dihydrothymine by Photochemical Addition of Water to l,3-Dimethyl-thymine +  
 Abstract    UV irradiation of aqueous solutions of 1,3-dimethyl-thymine with wavelength > 280 nm yields the eis-and trans-form of water addition product l,3-dimethyl-6-hydroxy-dihydro-thymine (2/3). 
  Reference    Z. Naturforsch. 36b, 226—230 (1981); eingegangen am 16. Juli 1980 
  Published    1981 
  Keywords    UV Irradiation, 1, 3-Dimethyl-thymine, l, 3-Dimethyl-6-hydroxy-dihydro-thymine 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0226.pdf 
 Identifier    ZNB-1981-36b-0226 
 Volume    36