Effets de l'irradiation X sur les chenilles de Bombyx mori dans diverses conditions d'alimentation et de jeune

Résumé Nous modifions le cycle nutritionnel des chenilles deBombyx mori, durant les premières 24 heures des deux premiers ages larvaires, avant ou après irradiation X. La chenille avant toute alimentation est très radiorésistante, le je?ne ne modifie pas cette radiorésistance. Suivant le moment du cycle physiologique (lorsque celui-ci est enclenché) où le je?ne est imposé, il diminuera ou augmentera la radiosensibilité des chenilles.

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Summary Silkworms (Bombyx mori) were exposed to irradiation in the 1st and 2nd larval instars. The effects, as indicated by mortality or by failure to moult, were studied in relation to a period of starvation (24 h at 22°). Before the initiation of feeding, in either instar, the larvae were very resistant to irradiation; and fasting did not modify this resistance. Probably this was due to physiological quiescence. After the initiation of feeding, the interposition of a fast either augmented or decreased radiation tolerance, probably according to the phase of the physiological cycle involving feeding and moulting.