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(invertebrate zoology)
The smaller, reproductive nucleus in multinucleate protozoans.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in infusorians, the smaller (generative) nucleus. The micronucleus is usually diploid and divides by mitosis; however, during the sexual process in infusorians (conjugation), it divides meiotically and gives rise to sexual nuclei or pronuclei. During the vegetative period, the genetic apparatus of the micronucleus remains inactive, does not synthesize ribonucleic acid, and has no influence on the phenotype of the organism.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The frequency of micronucleus lymphocytes with P at a concentration of 2.5 [micro]g/mL was insignificant as compared to control samples, while the combination of CUR (25 [micro]g/mL) and P (2.5 [micro]g/mL) increased significantly the frequency of micronuclei in binucleated lymphocytes as compared to control samples (Table 1, Figure 2).
Three ml blood was poured into the lithium heparinized tubes and stored at 4AdegC for estimation of micronucleus frequency by CBMN assay.
The number of micronucleus was 10 times higher 5 years after treatment than the number of micronucleus before treatment (11).
However, FB showed a significant radioprotective effect at a concentration of 100 [micro]M, and this dose of FB exhibited higher micronucleus than control.
Then, a lymphocyte after exposure to CPF is shown presenting a micronucleus as indicated by the arrow (Figure 2b).
Micronucleus test in the peripheral erytrocytes of the exotic fish, Oreochromis mossambica.
The rat bone marrow micronucleus test was carried out according to the method described by Mozdarani and Gharbali.
Each material was tested on human peripheral blood lymphocytes using the micronucleus assay and ethidium bromide/acridine orange viability staining.
Blood samples of the participants were taken into dysenteric analysis for 48 hours and the micronucleus (MN) analysis for 68 hours.