| 单词 |
pyknotic |
| 释义 |
pyknotic, a.|pɪkˈnɒtɪk|
Also pyc-.
[ad. Gr. πυκνωτικός, f. πυκνόειν to condense.]
1. Pertaining or relating to condensation: applied to a theory of the formation of matter.
1900tr. Haeckel's Riddle Univ. 222 In fundamental opposition to the theory of vibration, or the kinetic theory of substance, we have the modern ‘theory of condensation’, or the pyknotic theory of substance. It is most ably established in the suggestive work of J. C. Vogt on The Nature of Electricity and Magnetism on the Basis of a Simplified Conception of Substance (1891). 1904R. Christie in Contemp. Rev. Apr. 504 The pyknotic theory of substance differs from the kinetic theory, we are informed, in so far as the centres of condensation of the primitive ether are endowed with sensation and will.
2. Cytology. Displaying pyknosis.
1910in Lippincott's New Med. Dict. 798/1. 1926 Arch. Neurol. & Psychiatry XVI. 134 This change..was characterized by pyknotic shrinking of the nuclei and an increase in cytoplasm. 1936J. Krafka Textbk. Histol. i. 3 In old senescent cells a pycnotic nucleus is produced by a condensation of chromatin to the extent that no ground substance shows. 1957C. P. Swanson Cytol. & Cytogenetics ii. 34 The pycnotic state..persists into interphase to form what were formerly called pro-chromosomes. 1974Nature 11 Oct. 509/1 Within 3 h of furosemide administration..single cell necrosis with pyknotic hepatocytes showing eosinophilic degeneration was..occasionally present. |
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