adenostyles/pyrrolizidine

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Pyrrolizidine Alkaloids in Adenostyles alliariae and A. glabra from the Austrian Alps.

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The alkaloid content of Adenostyles alliariae and A. glabra (Asteraceae) has been evaluated. Both species contain toxic macrocyclic unsaturated pyrrolizidine alkaloids with seneciphylline as the main compound accounting for more than 90% of the alkaloid fraction in all above ground plant parts.

Reversible hepatic veno-occlusive disease in an infant after consumption of pyrrolizidine-containing herbal tea.

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Veno-occlusive disease was diagnosed in an 18-month-old boy who had regularly consumed a herbal tea mixture since the 3rd month of life. The boy developed portal hypertension with severe ascites. Histology of the liver showed centrilobular sinusoidal congestion with perivenular bleeding and

Effects of pyrrolizidine alkaloids and sesquiterpenes on snail feeding.

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We determined in the laboratory the feeding response of two populations of the generalist herbivorous snail Arianta arbustorum (Helicidae) towards the composite Adenostyles alliariae and towards various allelochemicals. These were: a pyrrolizidine alkaloid (PA) extract of Adenostyles leaves;

Do induced responses mediate the ecological interactions between the specialist herbivores and phytopathogens of an alpine plant?

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Plants are not passive victims of the myriad attackers that rely on them for nutrition. They have a suite of physical and chemical defences, and are even able to take advantage of the enemies of their enemies. These strategies are often only deployed upon attack, so may lead to indirect interactions

Response of a leaf beetle to two food plants, only one of which provides a sequestrable defensive chemical.

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Oreina elongata is a chemically defended leaf beetle. If its food plant contains pyrrolizidine alkaloids, all life stages of the beetle sequester them. However, one of the two known host-plant genera does not contain these alkaloids. In this paper we compare the adult feeding preference and larval

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