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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    Ruth MarxRequires cookie*
 Title    Characterization of the Nuclear Lamina in an Insect by Differential Staining  
 Abstract    The nuclear envelope of the larval fat body in the blow­ fly Calliphora vicina reveals a conspicuous nuclear lamina. It appears homogeneous, Fibrous or granular depending upon the fixing and staining methods. The best relative contrast for the nuclear lamina and the nuclear pore com­ plex is obtained with a phosphotungstic acid staining pro­ cedure designed for proteins. 
  Reference    Z. Naturforsch. 37c, 345—347 (1982); received October 29 1981 
  Published    1982 
  Keywords    Nuclear Lamina, Insect, Fat Body, Phosphotungstic Acid, Protein Staining 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0345_n.pdf 
 Identifier    ZNC-1982-37c-0345_n 
 Volume    37