979 resultados para Composés organiques volatiles


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A variety of agricultural plant species, including corn, respond to insect herbivore damage by releasing large quantities of volatile compounds and, as a result, become highly attractive to parasitic wasps that attack the herbivores. An elicitor of plant volatiles, N-(17-hydroxylinolenoyl)-l-glutamine, named volicitin and isolated from beet armyworm caterpillars, is a key component in plant recognition of damage from insect herbivory. Chemical analysis of the oral secretion from beet armyworms that have fed on 13C-labeled corn seedlings established that the fatty acid portion of volicitin is plant derived whereas the 17-hydroxylation reaction and the conjugation with glutamine are carried out by the caterpillar by using glutamine of insect origin. Ironically, these insect-catalyzed chemical modifications to linolenic acid are critical for the biological activity that triggers the release of plant volatiles, which in turn attract natural enemies of the caterpillar.

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"Extrait de la Revue scientifique et industrielle du docteur Quesneville."

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t.1. Colonies britanniques.--t.2. Colonies françaises.--t.3. Colonies françaises (suite) Colonies néerlandaises: Indes orientales néerlandaises; Surinam. Colonies allemandes. Colonie italienne de l'Érythrée. État indépendant du Congo.

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Con portadilla propia pp.55-60: "Observation de medecine a sur l'action du Poumon du Foetus.

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Mode of access: Internet.

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Mode of access: Internet.