pyknosis

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Related to pyknotic: karyolytic

pyknosis

[pik′nō·səs]
(pathology)
The polymerization and contraction of the nuclear chromosomal components.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
(B) Epileptic rat shows most of the hippocampal neurons are flattened with dark pyknotic nuclei.
Histopathological scoring Groups AA E EA V PN MC Healthy 0 0 0 0 0 0 AR 3 2 3 0 3 3 AR+desloratadine 2 1 2 0 2 2 AR+misoprostol 1 0 1 1 2 0 AR+desloratadine+misoprostol 0 0 1 1 1 0 E: edema; AA: acinar atrophy; EA: inflammation area; V: vacuolization; PN: pyknotic nucleus; MC: mast cell.
Prominent microscopic lesions in lymphoid organs included intra cytoplasmic inclusion bodies, syncytial cell formation, depletion and necrosis of lymphoid tissues with numerous lymphocyte infiltration with pyknotic nuclei, seen from day 14 to 21 of infection in untreated group B (Plate 3).
Dying cells were initially identified in sections stained with H&E, as having a shrunken pyknotic nucleus set in an intensely eosinophilic cytoplasm.
The goblet cells appear to be clustered and clotted in mucine clusters associated with the presence of metaplasic cellular specimens with some pyknotic nuclei.
Caption: Figure 4: Histological changes of the liver: (blue arrow) hepatocytes with hydropic degeneration; (red arrow) hepatocytes with hyaline degeneration (Mallory corpuscles); (black arrow) pyknotic nuclei.
Features of apoptosis include a pyknotic nucleus that dyes brown with uneven coloring and is typically ring shaped.
Degenerative changes include cytoplasmic rupture, loss of nuclear shape, elongation or indistinct segmentation of granulocyte nuclei, loss of chromatin definition (appear to have liquefied), pyknotic nuclei (necrobiotic forms), degranulation and cytoplasmic vacuolation.
Distinguishing pyknotic cells or degenerating cells from true mitotic figures can be challenging.
The epithelial cells become swollen, rounded and loosen shows pyknotic changes in nuclei and acidophilic cytoplasm.