[Hormonal control of vitellogenin synthesis in the Amphipoda Crustacea Orchestia gammarella (Pallas)]. / Quelques aspects du contrôle hormonal de la synthèse de la vitellogénine chez le crustacé amphipode Orchestia gammarella (Pallas).

The presence of a vitellogenin stimulating ovarian hormone (VSOH) in Orchestia gammarella has been demonstrated by gonadectomy and ovary grafting. Vitellogenin synthesis is not affected by molting hormone injection; it decreases after Y-organ (molting gland) cauterization. Studies in progress seem to indicate that the destruction of the median area of the protocerebrum is followed by a decrease of this synthesis.

[Variations in the level of ecdysones during the intermolt of male Orchestia gammarella Pallas (Crustacea. amphipoda) by radioimmunoassay]. / Etude des variations du taux des ecdysones au cours du cycle d'intermue chez le mâle d'Orchestia gammarella Pallas (Crustacé Amphipode) par dosage radioimmunologique

The molting hormone content is low during stages C, D0, D1' a-b; it rises up in D 1' c and attains a maximum in D 2. An important decrease of the hormone titer is observed at ecdysis. This titer is slightly lower at stage A and increases again at stage B. Only ecdysterone is detected at stages B and D 2.