Development of Amphioplus abditus (Verrill) (Echinodermata: Ophiuroidea): I. Larval biology.
A fraction rich in secretory granules was prepared from the pyloric caeca of Asterias amurensis by sucrose density gradient centrifugation. The freshly prepared fraction exhibited no casein-hydrolyzing activity- but showed nine times as much specific activity as that of tissue homogenates after incubation at 37 degrees C for thirty minutes. Electron microscopy showed that the secretory granules were membrane-bound granules measuring 0.5-290 mu in diameter and contained dense and/or light amorphous substances.
D000818:Animals; D004447:Echinodermata / Q000196:embryology / Q000254:growth & development*; D004622:Embryo, Mammalian / Q000033:anatomy & histology / Q000502:physiology; D004625:Embryo, Nonmammalian; D005260:Female; D005306:Fertilization; D006168:Guinea Pigs; D007814:Larva; D009024:Morphogenesis; D010060:Ovulation; D013696:Temperature; D013997:Time Factors; D014882:Water-Electrolyte Balance