title: Ecdysteroids in the shrimp Palaemon serratus: relations with molt cycle.
abstract: Ecdysteroids were studied during the molt cycle of the shrimp Palaemon serratus using radioimmunoassay and HPLC. Continuous presence of ecdysteroids was observed in whole extracts, with two hormonal peaks: a minor peak during stage B and a major one during stage D2. The ecdysteroid titers were generally higher in females than in males. The ecdysteroid peak at stage B was more pronounced in the integument (cuticle and epidermis) than in other tissues and, at this time, 20-hydroxyecdysone was the predominant form. The observed 20-hydroxyecdysone peaks in stages B and D2 are correlatable to the previously reported rise in integumental carbonic anhydrase activity.
mesh_terms: D000818:Animals; D002256:Carbonic Anhydrases / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004440:Ecdysone / Q000502:physiology*; D004441:Ecdysterone / Q000502:physiology*; D005260:Female; D008297:Male; D033541:Palaemonidae / Q000502:physiology*; D011863:Radioimmunoassay
chemical_list: D004440:Ecdysone; D004441:Ecdysterone; D002256:Carbonic Anhydrases