[Morphological and biochemical characterization of the developmental stages of fertilized eggs inSphaerechinus granularis Lam : II. DNA content, DNA polymerase activity and DNase activity].

The investigations were performed with the eggs of the sea urchin speciesSphaerechinus granularis Lam. They were kept at 22° C under continuous aeration for up to 45 hours with stirring to compensate for sedimentation. 1.

[Morphological and biochemical characterization of the developmental stages of fertilized eggs inSphaerechinus granularis lam : I. Rearing, Morphology and determination of stages].

1. Rearing to the developmental stage. Eggs and embryos of the sea urchin speciesSphaerechinus granularis were kept at a concentration of 3000 per ml in 101 batches at 22° C.