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Dehydropyrrolizidine alkaloids in two Cryptantha species: including two new open chain diesters one of which is amphoteric.

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BACKGROUND A livestock poisoning outbreak near Kingman, Arizona, USA, potentially linked to dehydropyrrolizidine alkaloids, prompted an evaluation of some local plants for the presence of these hepatotoxic alkaloids. OBJECTIVE To qualitatively and quantitatively examine two species of Cryptantha, a

Ontogeny of Defensive Chemistry in Longitarsus Flea Beetles (Coleoptera, Chrysomelidae): More Protection for the Vulnerable Stages?

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Several species of the flea beetles genus Longitarsus sequester pyrrolizidine alkaloids (PAs) from their host plants. Previous data demonstrated that PAs may be transferred from root-feeding larvae into the adult beetles. Here we compared the patterns and concentrations found in larvae and pupae of

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