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The two facies of pyrrolizidine alkaloids: the role of the tertiary amine and its N-oxide in chemical defense of insects with acquired plant alkaloids.
Larvae of Creatonotos transiens (Lepidoptera, Arctiidae) and Zonocerus variegatus (Orthoptera, Pyrgomorphidae) ingest 14C-labeled senecionine and its N-oxide with the same efficiency but sequesterExpand
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An Antiaphrodisiac in Heliconius melpomene Butterflies
Gilbert (1976) suggested that male-contributed odors of mated females of Heliconius erato could enforce monogamy. We investigated the pheromone system of a relative, Heliconius melpomene, usingExpand
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CO2 sensitive receptors on labial palps ofRhodogastria moths (Lepidoptera: Arctiidae): physiology, fine structure and central projection
SummaryThe tips of the labial palps ofRhodogastria possess a pit housing uniform sensilla (Fig. 1), histologically characterized by wall-pores and receptor cells with lamellated outer dendrites (Fig.Expand
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Hepatotoxic pyrrolizidine alkaloids in pollen and drying-related implications for commercial processing of bee pollen.
Using HPLC-ESI-MS, several saturated and 1,2-dehydropyrrolizidine alkaloids were detected, mainly as their N-oxides, in fresh pollen collected from flowers of the pyrrolizidine alkaloid-producingExpand
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Pyrrolizidine alkaloids in food: a spectrum of potential health consequences
Contamination of grain with 1,2-dehydropyrrolizidine ester alkaloids (dehydroPAs) and their N-oxides is responsible for large incidents of acute and subacute food poisoning, with high morbidity andExpand
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Pyrrolizidine alkaloids of Echium vulgare honey found in pure pollen.
The pyrrolizidine alkaloids previously identified in floral honey attributed to Echium vulgare (Boraginaceae) have been detected (8000-14 000 ppm) in pure pollen collected from the anthers of EchiumExpand
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Phylogenetic relationships among genera of danaine butterflies (Lepidoptera: Nymphalidae) as implied by morphology and DNA sequences
Cladistic relationships among genera and subtribes of Danaini (the milkweed butterflies) were inferred by analysis of data combined from five sources: morphology of adults and immature stages, andExpand
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Pyrrolizidine alkaloids in Chromolaena odorata. Chemical and chemoecological aspects
Abstract The tropical weed Chromolaena odorata contains the N -oxides of five pyrrolizidine alkaloids (PAs): 7- and 9-angeloylretronecine, intermedine, rinderine and 3′-acetylrinderine. HighestExpand
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Lepidoptera and pyrrolizidine alkaloids Exemplification of complexity in chemical ecology
  • M. Boppré
  • Biology, Medicine
  • Journal of Chemical Ecology
  • 2005
Pyrrolizidine alkaloids (PAs) are defensive secondary metabolites found in numerous plant groups. Various insects belonging to different orders have special requirements for these compounds andExpand
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Visual and Chemical Signalling in Butterflies: Functional and Phylogenetic Perspectives
The two major signal functions for adult butterflies are protection against predators and intraspecific communication. Protective use of colour patterns (e.g. aposematism, crypsis) is mainly directedExpand
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