Results 111 to 120 of about 2,914 (162)

Revealing the unseen: the organizer region of the nucleolus

Journal of Cell Science, 2001
We carried out a high-resolution ultrastructural analysis of the nucleolus in mouse P815 cells by combining specific DNA and RNA staining, anti-fibrillarin immunolabeling, contrast enhancement by energy filtering TEM and phosphorus mapping by ESI to visualize nucleic acids.
Biggiogera M., Malatesta M., Abolhassani-Dadras S., Amalric F., Rothblum L. I., Fakan S.   +5 more
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Nucleolus organizer regions (NORs) inserted in 6q15

Human Genetics, 1989
We studied a family in which three of the members present one chromosome 6 with an isochromatid gap at the band 6q15 level. Studies of the chromosomes by various banding techniques suggested that the secondary constriction represents a stalk from an acrocentric chromosome inserted into 6q15.
F, Prieto, L, Badía, M, Beneyto, F, Palau   +3 more
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Variable positions of nucleolus organizer regions in Bovidae

Experientia, 1981
Silver NOR staining has been applied to cattle (Bos taurus L.), goat (Capra hircus L.) and sheep (Ovis aries L.) chromosomes. The sites of silver NORs showed variation within the family Bovidae probably due to a reciprocal translocation event.
B, Mayr, R, Czaker
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Secondary constrictions and nucleolus organizer regions in man

Experimental Cell Research, 1977
[No abstract available]
FERRARO, Marina, N. Archidiacono, PELLICCIA, Franca, M. Rocchi, ROCCHI, Angela, DE CAPOA, Adriana   +5 more
openaire   +4 more sources

Nucleolus organizer regions in two species of Bovidae

Journal of Heredity, 1979
Silver-staining of nucleolar organizer regions (NORs) in somatic cells of Holstein cattle (Bos taurus) and European buffalo Murrah type (Bubalus bubalus) indicates that the NORs are located in the telomeres of chromosomes 2,3,4,11, and 29 of cattle and chromosomes 3,4,6,23, and 24 of buffalo. Chromosome identification was by Q-banding.
D, Di Berardino, F E, Arrighi, N M, Kieffer   +2 more
openaire   +2 more sources

Polymorphic nature of nucleolus organizer regions in fishes

Cytogenetics and Cell Genetics, 2008
An analysis of the nucleolar organizer region (NOR) by silver staining of five species of the order Gymnotiformes, Gymnotus carapo, Apteronotus albijrons, Sternopygus macrurus, Eigenmannia virescens, and Eigenmannia sp., is reported. The five species presented only one pair of homologs bearing NORs. In G. carapo, A. albijrons, and S.
Foresti, F., Toledo, LFA, Toledo, S. A.
openaire   +3 more sources

Evidence for the inheritance of silver-stained nucleolus organizer regions

Human Genetics, 1978
The inheritance of nucleolus organizer regions (NORs) was investigated by examining the degree of silver-staining in individual acrocentric chromosomes in two successive generations. The study was undertaken in six Down's syndrome children and their respective parents.
V D, Marković, R G, Worton, J M, Berg
openaire   +2 more sources

The Effect of Ph on Silver Staining of Nucleolus Organizer Regions

Stain Technology, 1987
The effect of pH on silver staining of the nucleolus organizer regions (NORs) of human chromosomes has been investigated between pH 6.5 and 12.0. Nonvolatile mixtures of ethanolamine and ethanolammonium nitrate replaced the ammonia of standard procedures.
B E, Lomholt, J M, Toft
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Variant nucleolus organizing regions and the risk of Down syndrome

Clinical Genetics, 1989
In order to determine whether nucleolus organizing region (NOR) heteromorphisms of the acrocentric chromosomes could identify individuals at risk for having offspring with trisomy 21, a comparison was made between 43 parents of individuals with Down syndrome and 39 controls. NORs, as visualized by silver staining, were analyzed by mean number per cell,
J E, Green, K N, Rosenbaum, S I, Rapoport, M B, Schapiro, B J, White   +4 more
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Nucleolus-organizer regions and heterochromatin in three species of Bovidae

Genetica, 1987
Ag-NOR staining and a counterstain-enhanced fluorescence technique (chromomycin A3/distamycin A/DAPI staining = CDD-method) have been applied to ibex (Capra ibex L.), chamois (Rupicapra rupicapra L.) and bison (Bison bison L.) chromosomes. Chromomycin A3 visualization led to a well defined R-banding pattern along the chromosome arms and to a clear ...
B, Mayr, E, Tesarik, H, Auer, H, Burger
openaire   +2 more sources