Development of Amphioplus abditus (Verrill) (Echinodermata: Ophiuroidea): I. Larval Biology

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 incu...

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Veröffentlicht in:The Biological bulletin 1977-02, Vol.152 (1), p.51-63
1. Verfasser: Hendler, Gordon
Format: Artikel
Sprache:eng
Schlagworte:
Animals
Arm
Echinodermata - embryology
Echinodermata - growth & development
Embryo, Mammalian - anatomy & histology
Embryo, Mammalian - physiology
Embryo, Nonmammalian
Embryos
Female
Fertilization
Guinea Pigs
Hatching
Larva
Larvae
Larval development
Morphogenesis
Ova
Ovulation
Salinity
Sea water
Skeleton
Temperature
Time Factors
Water-Electrolyte Balance
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Zusammenfassung: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.
ISSN:0006-3185
1939-8697
DOI:10.2307/1540726