pyknosis


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Related to pyknosis: karyolysis, karyorrhexis

pyknosis

[pik′nō·səs]
(pathology)
The polymerization and contraction of the nuclear chromosomal components.
References in periodicals archive ?
On examination of the Hematoxylin and Eosin stained sections of the diabetic group, it revealed myocardial disarray accompanied with loss of the normal striated architecture of the cardiomyocytes with presence of characteristic degenerative changes of the nuclei in the form of pyknosis, karyorrhexis, and karyolysis.
4mg/Kg) of body weight of soup extract shows Hyaline cast, and cells Inflammatory cell, and Nuclear pyknosis, collect nuclear material behind the nuclear envelope: Nuclear Margination (Fig.
Whereas degenerative changes, such as pyknosis and the disappearance of chromosomes, predominated in preantral follicles, about 80% of oocytes in antral follicles showed signs of induction of pseudo-maturation division (Fig.
The interspersed small dark cells indicating pyknosis of the tumor cells could form rosette-like structures.
Nucleolar damage of photoreceptors that occurred after exposure include an early stage of nucleolar condensation (Figure 6B), karyolysis (Figure 6C), pyknosis (Figure 6D-E), and karyorrhexis (Figure 6F).
These cells represent macrophage degeneration with nuclear pyknosis, which is described as a 'crumpled sheet' with droplets of fat around it.
Necrosis was characterized by pyknosis, karyorhexis and karyolysis of nuclei in tubular epithelial cells.
Pathological observations: Liver of birds in groups 1-6 (Arsenic 50mg/kg) grossly revealed no significant lesions; however, microscopically liver parenchyma exhibited degenerative and necrotic changes (intracytoplasmic vacuolation) and various morphological changes in nucleus including hyperchromasia, pyknosis, fragmentation and cells without nucleus were observed (Fig.
Similarly, necrotic cell death has been reported accompanied by irreversible changes in the nucleus, such as karyolysis, pyknosis and karyorrhexis (21) as well as the loss of structure and fragmentation of the cytoplasm, similar to what is observed at high magnification (Figure 2A3c) when compared with the nonischemic control (Figure 2A1a).
The apoptotic features noted included, chromatin condensation (white arrows-Figure 3), nuclear pyknosis (white arrowheads-Figure 3) and nuclear fragmentation (bottom panels-Figure 3).
The nephrotoxicity especially glomerulus and tubular changes; shrunken and degenerated of glomeruli; pyknosis and vacuolated cytoplasm of tubules were observed after treatment with Cd in the present work.
These were; contaminant bacteria and fungi, cytoplasmic inclusions, disintegrating cytoplasm, vacuolated cytoplasm, and presence of karyolysis, karyorrhexis and pyknosis.