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'Ecdysteroids' in keywords Facet   Publication Year 1994  [X]
Facet   section ZfN Section C  [X]
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1994[X]
1Author    Karl-Heinz TomaschkoRequires cookie*
 Title    Defensive Secretion of Ecdysteroids in Pycnogonum litorale (Arthropoda, Pantopoda)  
 Abstract    In response to disturbance, the pycnogonid Pycnogonum litorale discharges a mixture o f eight ecdysteroids (ES). Repeated intensive m olestation causes 99% secretion o f the endogenous ES present. The concentration o f the total ES in the defensive effluent is 1.0 x 10" 3 m o lT '1. 20-Hydroxyecdysone 22-acetate, the predominant ES, reaches 0.8 x 10" 3 m ol T_1. This is sufficient to deter significantly feeding by the com m on shore crab Carcinus maenas, a generalist predator in the habitat o f the pycnogonid. There is evidence that the secreted ES o f P. litorale contribute to its unpalatability. The present paper describes for the first time defensive secretion in marine arthropods. 
  Reference    Z. Naturforsch. 49c, 367—371 (1994); received February 10 1994 
  Published    1994 
  Keywords    Pycnogonids, Pycnogonum litorale, Ecdysteroids, Defensive Secretion, Chemical Defense 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0367.pdf 
 Identifier    ZNC-1994-49c-0367 
 Volume    49 
2Author    FranzR. Öm Er, Hans-Ulrich BresselRequires cookie*
 Title    Secretion and Metabolism of Ecdysteroids by Oenocyte-Fat Body Complexes (OEFC) in Adult Males of Gryllus bimaculatus D EG (Insecta)  
 Abstract    Extracts of w hole adult males o f Gryllus bimaculatus show distinct maxima o f free ecdy­ steroids on the 8th, 12th and 14th day after imaginal moult at a breeding temperature of 25 °C. Isolated O EFC of 11 days old males secrete in vitro free as well as conjugated ecdy­ steroids, although the latter predominate. The bulk of free ecdysteroids seem s to consist of E and 20 E according to their retention times in two HPLC systems. Apart from the polar ones, apolar m etabolites appear during incubation. By esterase the apolar m etabolites are m ostly split into polar ones, partly into 20 E and E. Further treatment of the polar m etabolites with helicase leads again to E and 2 0 E. OEFC transform [3H]E preferably into apolar and polar conjugates, with dominance of the apolar ones at the beginning and o f polar ones in the further course o f incubation. Only a small quantity o f free 2 0 E is found during this experim ent, but it can be produced in significant quantities by splitting the polar conjugates. N o conversion o f [3H]cholesterol into [3H]ecdysteroids could be detected. 
  Reference    Z. Naturforsch. 49c, 871 (1994); received February 14/August 26 1994 
  Published    1994 
  Keywords    Ecdysteroids, Secretion, Metabolism, Oenocyte-Fat Body Complexes, G ryllus bimaculatus 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0871.pdf 
 Identifier    ZNC-1994-49c-0871 
 Volume    49