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Periodicity of Cytoplasmic Cycle in Nonnucleate Fragments of Sea Urchin and Starfish Eggs *
Author(s) -
YONEDA MITSUKI,
YAMAMOTO KENYA
Publication year - 1985
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1985.00385.x
Subject(s) - hemicentrotus , starfish , sea urchin , chemistry , biology , zoology , microbiology and biotechnology , paleontology
Fertilized eggs of the sea urchin, Hemicentrotus pulcherrimus and the starfish, Asterina pectinifera were separated by manual bisection to obtain pairs of nucleate and non‐nucleate fragments. Simultaneous observation on the pair revealed that the cyclic change in the cortical tension in the non‐nucleate fragment was definitely prolonged than the cleavage interval of nucleate partner by about 30%. Activated non‐nucleate cytoplasmic fragments derived from the unfertilized eggs and colchicine treated whole eggs of H. pulcherrimus still showed the same degree of prolongation.