A general field bioassay for detecting biologically active compounds in plants and insects has been developed and tested for efficacy and sensitivity. Methanolic extracts, in sucrose solution, of 20 plant and six caterpillar species were offered to the ponerine ant Paraponera clavata and the feeding preferences observed. The bioassay resulted in the detection of nine plant and three caterpillar...

A general field bioassay for detecting biologically active compounds in plants and insects has been developed and tested for efficacy and sensitivity. Methanolic extracts, in sucrose solution, of 20 plant and six caterpillar species were offered to the ponerine ant Paraponera clavata and the feeding preferences observed. The bioassay resulted in the detection of nine plant and three caterpillar...

• Certain plant species hyperaccumulate selenium (Se) to 1000 mg kg − 1 d. wt, even from low-Se soils. It is not known whether Se hyperaccumulation offers these plants any advantage. In this study the hypothesis was tested that Se can protect plants from phloem-feeding herbivores. • Indian mustard ( Brassica juncea ) grown with or without Se was subjected to colonization by green peach aphids (...

Principle of non-refoulement protected by EU law – National practices Deterrence Pushbacks Border police deterrence Reaction institutions Legal uncertainties ‘Safe country origin’ ‘First asylum’ third country’ values New Pact on Migration and Asylum