pyknosis


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Related to pyknosis: karyolysis, karyorrhexis

pyknosis

 [pik-no´sis]
a thickening, especially the degeneration of a cell in which the nucleus shrinks in size and the chromatin condenses to a solid, structureless mass or masses. adj., adj pyknot´ic.

pyk·no·sis

(pik-nō'sis),
A thickening or condensation; specifically, a condensation and reduction in size of the cell or its nucleus, usually associated with hyperchromatosis; nuclear pyknosis is a stage of necrosis.
[pykno- + G. -osis, condition]

pyknosis

/pyk·no·sis/ (pik-no´sis) a thickening, especially degeneration of a cell in which the nucleus shrinks in size and the chromatin condenses to a solid, structureless mass or masses.pyknot´ic

pyknosis

[piknō′sis]
the condensation of nuclear material into a solid, darkly staining mass in a dying cell thickness, especially shrinking of cells through degeneration.
enlarge picture
Pyknosis

pyk·no·sis

(pik-nō'sis)
A thickening or condensation; specifically, a condensation and reduction in the size of the cell or its nucleus, usually associated with hyperchromatosis; nuclear pyknosis is a stage of necrosis.
[pykno- + G. -osis, condition]

pyk·no·sis

(pik-nō'sis)
A thickening or condensation; specifically, a condensation and reduction in the size of the cell or its nucleus, usually associated with hyperchromatosis.
[pykno- + G. -osis, condition]

pyknosis (piknō´sis),

n increased basophilia and shrinkage of the nucleus of a dying cell.

pyknosis

a thickening, especially degeneration of a cell in which the nucleus shrinks in size and the chromatin condenses to a solid, structureless mass or masses.
References in periodicals archive ?
It is known that ooplasmic vacuolation and GC pyknosis are observed simultaneously with early antrum formation in atretic follicles (21, 33).
In the present study we showed that follicles under 200 [micro]m in diameter had increased percentage of GC pyknosis in the test groups in comparison to the control-sham group.
In that case, C4d staining highlighted a second area of hypereosinophilic myocytes with nuclear pyknosis consistent with a reinfarction of less than 8 hours in duration (sample 15A).
Both ID and IR were associated with marked infiltration of leukocytes in the adventitia, pyknosis of endothelial cells and marked collagen deposition as stained by blue color.
In support of TNF-[alpha] and NF-kB data in this study, aorta isolated from both ID and IR animals revealed increased leukocyte infiltration in the adventitia and marked endothelial cells pyknosis while baicalein significantly reduced leukocyte infiltration and endothelial cells pykosis.
Given that it is difficult to distinguish MFs on H&E-stained slides from similar chromatin changes occurring in apoptotic cells or secondary to crush, distortion, pyknosis, or necrosis, (54) as the diagnostic criterion, MF is not as subjective as usually considered.
The walls of afferent arterioles were effaced by smudgy eosinophilic material that severely narrowed the vessel lumens, and nuclear pyknosis and karyorrhexis were seen within the altered arteriolar walls (Figure 1).
Nuclear pyknosis and karyorrhexis were present in the amorphous material in the arteriolar walls (Figure 5).
Necrotic cell death results in cell lysis, whereas apoptosis leads to cell shrinkage, nuclear pyknosis, chromatin condensation, and bleeding of the plasma membrane.