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'Metabolism' in keywords Facet   Publication Year 1982  [X]
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1982[X]
1Author    Hartm Ut KayserRequires cookie*
 Title    Carotenoid Biogenesis in the Stick Insect, Carausius morosus, during a Larval Instar  
 Abstract    [14C]/?-Carotene was fed to juvenile stick insects, Carausius morosus, o f the fifth instar. Radio­ activity was incorporated into 2-hydroxy-, 2-oxo-, and 3,4-didehydro-2-oxo-carotenoids o f the ß,ß-type. These transformations are due to the insect's own capacity; any contribution by microbial symbionts can be ruled out. A study on the labelling kinetics clearly shows that the biogenesis of hydroxy-and oxo-carotenoids is correlated to a decrease in the carotene precursor, but only up to mid instar. Thereafter, oxidation o f the carotene is very low but the transformations of its metabolites continue as before. Predominantly ß,^-carotene-2,2'-diol is dehydrogenated to 3,4,3',4'-tetradehydro-/?,/?-carotene-2,2'-dione via two hydroxyketones. This discontinuous utilization o f /7-carotene could be due to a stop at mid instar either in the oxidation or in the absorption in the gut o f this precursor. 
  Reference    Z. Naturforsch. 37c, 13 (1982); received September 11/October 281981 
  Published    1982 
  Keywords    Carotenoids, Metabolism, [14C]/?-Carotene, Insects, Carausius morosus 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0013.pdf 
 Identifier    ZNC-1982-37c-0013 
 Volume    37 
2Author    K.-M Weltring, K. Mackenbrock, W. BarzRequires cookie*
 Title    Demethylation, Methylation and 3'-Hydroxylation of Isoflavones bv Fusarium Fungi  
 Abstract    Several introductionary reactions of isoflavone metabolism by Fusarium fungi are reported. Fu­ sarium avenaceum hydroxylates formononetin in the 3'-position yielding 3',7-dihydroxy-4'-me-thoxyisoflavone (calycosin). 3'-Hydroxylation o f biochanin A to 3/,5,7-trihydroxy-4/-methoxyiso-flavone (pratensein) has been observed with Fusarium oxysporum f. sp. lycopersici and Fusarium oxysporum f. sp. I ini. Depending on the growth medium Fusarium proliferatum metabolises for­ mononetin either by 7-O-methylation or by 4'-0-demethylation. 
  Reference    Z. Naturforsch. 37c, 570—574 (1982); received March 29 1982 
  Published    1982 
  Keywords    Isoflavones, Fusarium, Methylation, Demethylation, 3'-Hydroxylation, Metabolism 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0570.pdf 
 Identifier    ZNC-1982-37c-0570 
 Volume    37