当前位置： SCI文献检索 > CELL AND TISSUE RESEARCH期刊下所有文献 > Cell differentiation during early development of Nassarius reticulatus L. (Gastropoda, Prosobranchia). II. Morphological changes of nuclei and nucleoi.

Cell differentiation during early development of Nassarius reticulatus L. (Gastropoda, Prosobranchia). II. Morphological changes of nuclei and nucleoi.

Abstract：

:In Nassarius reticulatus the nuclei and nucleoli undergo important morphological changes from the zygote to the 16-cell stage. In the zygote and in the trefoil (2-cell) and 4-cell stage, several agranular, fibrillar nucleolus-like bodies 1 mum diameter are present in the interphase nucleus. Granular nucleoli first appear at the 8-cell stage. These nucleoli have fibrillar and granular regions. The granular regions are made up predominantly of ribosome-liek osmiophilic granules. From the 16- and 32-cell stage onwards, the one or two spherical nucleoli of each nucleus measure 2.5 mum in diameter and show a concentric organization with a very dense central region surrounded by a broad peripheral zone containing numerous granules, possibly of ribonucleoprotein. At the same time the number of ribosome-like particles increase in the karyoplasm and that of ribosomes in the cytoplasm. These findings are surprising because in eggs with radial cleavage, which have been subjected to more detailed analysis, the first granular nucleoli appear after the end of the cleavage, at the blastula or gastrula stage. The early appearance of granular nucleoli which seem to be characteristic of several eggs with spiral cleavage is discussed in connection with biochemical data on RNA-synthesis.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Schmekel L,Fioroni P

doi

10.1007/BF00215313

subject

Has Abstract

pub_date

1976-05-13 00:00:00

pages

361-71

issue

3

eissn

0302-766X

issn

1432-0878

journal_volume

168

pub_type

杂志文章

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