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2001 (1)
1993 (1)
1Author    Reinhold DemRequires cookie*
 Title    Influence of Food and Larval Age on the Defensive Chemistry of Satumia pyri  
 Abstract    Scolus secretions and hemolymph of caterpillars of Satumia pyri fed with two different foodplants (Crataegus m onogyna, Prunus spinosa) were chemically analyzed and their chemi­ cal similarities determined. The secondary-compound patterns obtained for the two body fluids showed no significant differences when compared between the two groups of alterna­ tively fed last-instar larvae. Thus, the composition of these fluids of full-grown caterpillars is not influenced by the larval diet. However, younger larvae on P. spinosa revealed a diversity of compounds differing significantly from that of larger caterpillars fed with either C. m ono­ gyna (both body fluids) or P. spinosa (hemolymph only). This indicates that, on the one hand, the hemolymph composition is adapted to the changing physiological requirements of the given instars whereas, on the other hand, the defensive mixtures remain unaltered in the late larval instars due to a constant spectrum of potential enemies. 
  Reference    Z. Naturforsch. 56c, 89—94 (2001); received September 12/October 18 2000 
  Published    2001 
  Keywords    Chemical Defense, Saturniidae, Secondary Compounds 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0089.pdf 
 Identifier    ZNC-2001-56c-0089 
 Volume    56 
2Author    R. A. Ta N, T. Eeyapant3, PatriciaK. Reis3, V. Ictor, W. Rayb, LudgerW. Ittec, Peter Proksch3Requires cookie*
 Title    Brominated Secondary Compounds from the Marine Sponge Verongia aerophoba and the Sponge Feeding Gastropod Tylodina perversa  
 Abstract    Analysis of the marine sponge Verongia aerophoba from the Canary islands afforded the brominated secondary constituents isofistularin-3, aerophobin-1 and aerophobin-2 which are probably involved in the chemical defense of the sponge. In addition the yellow pigment urani-dine and the unusual sterol aplysterol were isolated. The patterns o f brominated compounds were almost superimposable when samples of V. aerophoba from different islands were com­ pared by HPLC indicating de novo synthesis by the sponge or by endosymbiotic microorgan­ isms rather than uptake by filter feeding. The only differences observed between the different samples analyzed were with regard to the total concentrations of brominated compounds which varied from 7.2-12.3% of the dry weight dependent on the different collection sites. The Opisthobranch gastropod Tylodina perversa is specialized for feeding on V. aerophoba. Chemical analysis of the gastropod revealed the sponge constituents uranidine, isofistularin-3, aerophobin-1 and aerophobin-2 as well as aerothionin, a further brominated compound which is apparently a biotransform ation product of the brom inated sponge constiiuents. 
  Reference    Z. Naturforsch. 48c, 640—644 (1993); received March 17 1993 
  Published    1993 
  Keywords    Verongia aerophoba, Tylodina perversa, Sponges, G astropods, Secondary Compounds 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0640.pdf 
 Identifier    ZNC-1993-48c-0640 
 Volume    48