Oogonia are cells characterized by one basophilic
nucleolus; dispersed chromatin, extremely narrow and weakly basophilic cytoplasm (Fig.
These findings can be explained on the basis of the speculations given by Crocker et al (1988), [10] who observed a linear correlation between the mean numbers of AgNOR per
nucleolus and percentage of S phase cell and suggested that the numbers on AgNOR's in a lymphoma may be related to the dividing fraction of the cell rather than to the ploidy alone.
The prevalent structure (nucleus or
nucleolus) in the four segments of RC was recorded; to define a structure as prevalent, it was necessary that it is detectable in >55% of observed SGs.
Activation of the
nucleolus is known to drive tumour formation and this dysfunction has also been linked to Alzheimer's and Parkinson's disease.
Lamond, "The
nucleolus under stress," Molecular Cell, vol.
Boisvert et al., "Quantitative proteomics and dynamic imaging of the
nucleolus reveal distinct responses to UV and ionizing radiation," Molecular & Cellular Proteomics, vol.
The
nucleolus. Annu Rev Cell Dev Biol 1995;11:93-121.
Oogonial proliferation and progressive morphological changes in the ooplasm of the oocytes were used to classify oogenesis in distinct stages that included oogonial proliferation, chromatin
nucleolus, primary growth and secondary growth (vitellogenesis).
In addition, ultra structure observation of embryo cells showed that serious damage occurred in seeds with 16% moisture content, including the broken cellular and nuclear membrane, pyknotic
nucleolus and swollen mitochondria.
If the
nucleolus was in the focus at the beginning, the plane was disregarded.