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nucleolus
nucleolus
nucleolus A small dense round body within the nucleus of a nondividing eukaryotic cell that is the site of ribosome assembly. It forms around the
nucleolar organizer, which encodes most of the segments of ribosomal RNA. Ribosomal proteins migrate to the nucleolus from their assembly sites in the cytoplasm and are packaged into
ribonucleoproteins, which then return to the cytoplasm where they become mature ribosome particles.
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Positioning of the NOR-Bearing Chromosomes in Relation to Nucleoli in Daughter Cells after Mitosis
Magazine article from: Physiological Research; 5/1/2008; ; 700+ words
; ...clusters termed Nucleolus Organizer Regions...chromosomes) with nucleoli, as well as the...clusters termed Nucleolus Organizer Regions...Smetana 1970). Nucleoli disintegrate during...formation of a given nucleolus (Raska, 2003...and the number of nucleoli in the nucleus are...
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Assembly of a functional nucleolus involves the Cajal (Coiled) body.
Newspaper article from: Genomics & Genetics Weekly; 3/7/2003; 615 words
; ...concerning the reassembly of a functional nucleolus remain scarce. "We have examined by...bodies in the building of a functional nucleolus," Zatsepina and coauthors concluded...step-wise assembly of a functional nucleolus in preimplantation mouse embryos involves...
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Genetic Linkage Map of the Nucleolus Organizer Region in the Soybean
Magazine article from: Genetics; 1/1/2008; ; 700+ words
; ...ABSTRACT Simple polymorphisms in ribosomal DNA repeats in the nucleolus organizer region (NOR) permitted the development of markers...verified that the satellite region of chromosome 13 is the nucleolus organizer region (NOR) (Griffor et al. 1991). FISH resulted...
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Arabidopsis Ribosomal Proteins RPL23aA and RPL23aB Are Differentially Targeted to the Nucleolus and Are Disparately Required for Normal Development1[C][W][OA]
Magazine article from: Plant Physiology; 5/1/2008; ; 700+ words
; ...C-terminal fluorescent-protein tag demonstrated that both isoforms accumulated in the nucleolus; however, only RPL23aA was targeted to the nucleolus with an N-terminal fluorescent protein tag, suggesting divergence in targeting efficiency...
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Crossover Interference on Nucleolus Organizing Region-Bearing Chromosomes in Arabidopsis
Magazine article from: Genetics; 6/1/2005; ; 700+ words
; ...short arms (COPENHAVER et al. 1995; COPENHAVER and PIKAARD 1996). DNA encoding rRNA (rDNA) is commonly referred to as a nucleolus organizing region (NOR) because of the distinct suborganellar structure that forms around rRNA genes during interphase...
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Ultrastructural and autoradiographic studies of the role of nucleolar vacuoles in soybean root meristem
Magazine article from: Folia Histochemica et Cytobiologica; 1/1/2004; ; 700+ words
; ...transport outside nucleolus. Key words: Nucleolus - Nucleolar vacuole...Autoradiography Introduction Nucleoli are visible in nucleus...nucleus, only one nucleolus is present [15...ultrastructure of nucleoli and nucleolar vacuoles...
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The HIV Tat protein affects processing of ribosomal RNA precursor.(Research article)(human immunodeficiency virus)
Magazine article from: BMC Cell Biology; 6/17/2008; ; 700+ words
; ...multimerizes in the nucleolus and appears to play...fibrillarin in nurse cell nucleoli, causes death and delayed...with fibrillarin in the nucleolus of Drosophila cells...each contains several nucleoli. The images in Fig...nucleoplasm and in the nucleolus, where it colocalizes...
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Research results from University of Paris update knowledge of cell biology.
Newspaper article from: Life Science Weekly; 7/29/2008; 700+ words
; ...exchanges within one nucleolus and between nucleoli within the nuclear...containing two nucleoli. The traffic...the neighbouring nucleolus is measured...the neighbouring nucleolus or the CB...the Cell (In nucleoli, the steady state...
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Research on plant cell research detailed by S.H. Kim and co-authors.
Newspaper article from: Science Letter; 11/3/2009; 622 words
; "The eukaryotic nucleolus is multifunctional and involved in the metabolism and...thaliana exon junction complex proteins associate with the nucleolus, suggesting a role for the nucleolus in mRNA production," scientists writing in the journal...
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Studies from University of Lodz have provided new data on immunofluorescence.
Newspaper article from: Biotech Week; 4/22/2009; 700+ words
; ...of circular domains in the nucleoli of each variant may indicate...transcriptional activity of the nucleoli, with the more metabolically...numbers of active areas in the nucleolus and higher levels of nucleolar...the ultrastructure of the nucleoli in all experimental variants...
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Nucleolus
Book article from: Biology
...have multiple nucleoli. The nucleolus is a ribosome...transported out of the nucleolus to the cytoplasm...synthesis). Nucleoli are not static...thus a single nucleolus. In addition...established function of nucleoli in ribosome assembly...
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nucleolus
Book article from: A Dictionary of Nursing
nucleolus (new-kli- oh -lŭs) n. (pl. nucleoli) a dense spherical structure within the cell nucleus that disappears during cell division. The nucleolus contains RNA for the synthesis of ribosomes.
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Nucleus
Book article from: World of Microbiology and Immunology
...protein synthesis . The nucleolus is a small structure...RNA and proteins. The nucleolus disappears and reorganizes...from one to several nucleoli. Nucleoli are associated...blastula) do not have a nucleolus. Because the cells...competence to produce nucleoli, gastrula and all ...
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Ribosome
Book article from: Genetics
...in a structure within the nucleus called the nucleolus. Eukaryotic ribosome synthesis is especially...nucleus), so they then must be imported into the nucleolus for assembly onto the nucleolus-derived rRNA. Once assembled, the nearly...
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Nucleus, Cellular
Encyclopedia entry from: The Gale Encyclopedia of Science
...about. The major components of the nucleus include the chromosomes, the nucleolus, the nucleoplasm, and the nuclear cortex. Chromosomes are made of DNA; the nucleolus manufactures ribosomal components; and the nucleoplasm is the fluid and...
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