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- W2316011614 abstract "The unfertilized eggs of the sand-dollar, Dendraster, which normally are shed from the ovaries fully mature, were sedimented by centrifuging at approximately 40,000 gravities for 7-10 minutes, with the result that the eggs were elongated to dumb-bell-shape and pear-shape and the nucleus thrown to the extreme centripetal end, against the “oil-cap”. The eggs were then caused to develop parthenogenetically by means of a modified Loeb's method of acidulated sea water and hypertonic treatment. With respect to the effects of sedimentation on subsequent development, the eggs of different individuals behaved somewhat differently. On the basis of types of cleavage the females whose eggs were used may be classed in three groups, namely, (1) those whose eggs show complete but unequal segmentation, cleavage of the centripetal (nucleated) end being retarded so that as a result the blastomeres are abnormally large there, rapid cleavage at the centrifugal end resulting in blastomeres of approximately normal size; (2) th..." @default.
- W2316011614 created "2016-06-24" @default.
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- W2316011614 date "1938-02-01" @default.
- W2316011614 modified "2023-09-27" @default.
- W2316011614 title "Segregation of Cleavage-Substance in the Unfertilized Egg of Dendraster excentricus." @default.
- W2316011614 doi "https://doi.org/10.3181/00379727-38-9776p" @default.
- W2316011614 hasPublicationYear "1938" @default.
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