nucleolus organizer

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Noun1.nucleolus organizer - the particular part of a chromosome that is associated with a nucleolus after nuclear division
anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure"
chromosome - a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; "humans have 22 chromosome pairs plus two sex chromosomes"
References in periodicals archive ?
Karyotypic characterization and nucleolus organizer region in Cyprinodon dearborni (Meek, 1090) from venezuela.
Nucleolus organizer regions (NOR) were observed on the short arms of two pairs of chromosomes.
Black, "Controlled silver-staining of nucleolus organizer regions with a protective colloidal developer: a 1-step method," Experientia, vol.
For the 4 Plebeia species the heterochromatic arm of the heteromorphic pair was marked by [CMA.sub.3], reinforcing the idea that this region contains the nucleolus organizer. Furthermore, positive correlation was observed between markers Ag-NOR and [CMA.sub.3] in interphase nuclei, which showed the prevalence of G and C bases in the region of the nucleolus.
Staining of the nucleolus organizer regions (AgNORs) was carried following the procedure described by Howell and Black (1980).
The characterization of Ostrea denselamellosa (Mollusca, Bivalvia) chromosomes: karyotype, constitutive heterochromatin and nucleolus organizer regions.
The first cytogenetic analysis by conventional Giemsa staining, silver nitrate impregnation of nucleolus organizer regions (Ag-NOR), and fluorescenee in situ hybridization (FISH) carried out on Ophisternon aenigmaticum from Margarita Island, Venezuela, is reported.
Population differences in the expression of nucleolus organizer regions in the grasshopper Eyprepocnemis plorans.
However, microchromosomes are not unimportant components of the avian karyotype, particularly given that nucleolus organizer regions in avian species are located on microchromosomes (Small 1991).
We were able to hybridize wheat probe pta71, containing a cloned monomer of the 45S rDNA nucleolus organizer rDNA repeat (NOR rDNA) labeled with Alexafluor 488-5-dUTP, to somatic metaphase and interphase chromosomes of A.