Results 291 to 300 of about 2,892,023 (342)
Some of the next articles are maybe not open access.
Circular ribosomal DNA during ribosomal magnification in Drosophila melanogaster
Journal of Molecular Biology, 1977DNA from excised testes of Drosophila melanogaster males undergoing ribosomal DNA magnification shows two peaks on an ethidium bromide/CsCl density gradient: a minor peak that bands to a density of 1·570 g/cm3 and a main peak corresponding to 1·540 g/cm3 density.
F. GRAZIANI +2 more
openaire +2 more sources
Structure and organization of ribosomal DNA
Biochimie, 1991Three trends are seen in the organization of ribosomal DNA genes during evolution: 1) gradual separation and separability of the regulation of transcription of 5S and larger subunit rRNAs; 2) retention of a transcription unit containing both large and small rRNAs; and 3) clustering of genes for both 5S and 18S-28S rDNAs, with the possible association ...
A K, Srivastava, D, Schlessinger
openaire +2 more sources
Ribosomal DNA and Neurological Disorders
Current Molecular MedicineRibosomal DNA (rDNA) is important in the nucleolus and nuclear organization of human cells. Defective rDNA repeat maintenance has been reported to be closely associated with neurological disorders, such as Alzheimer’s disease, Huntington’s disease, Parkinson’s disease, amyotrophic lateral sclerosis, frontotemporal dementia, depression, suicide, etc ...
Hong Zhou +6 more
openaire +2 more sources
The Ribosomal DNA Plasmids of Entamoeba
Parasitology Today, 1998In most organisms, the nuclear ribosomal RNA (rRNA) genes are highly repetitive and arranged as tandem repeats on one or more chromosomes. In Entamoeba, however, these genes are located almost exclusively on extrachromosomal circular DNA molecules with no clear evidence so far of a chromosomal copy.
S, Bhattacharya, I, Som, A, Bhattacharya
openaire +2 more sources
Nontranscribed spacers in Drosophila ribosomal DNA
Chromosoma, 1981Ribosomal DNA nontranscribed spacers in Drosophila virilis DNA have been examined in some detail by restriction site analysis of cloned segments of rDNA, nucleic acid hybridizations involving unfractionated rDNA, and base composition estimates. The overall G + C content of the spacer is 27--28%; this compares with 39% for rDNA as a whole, 40% for main ...
P M, Rae, T, Barnett, V L, Murtif
openaire +2 more sources
1988
The nucleolus organizer region (NOR) of maize chromosome 6 is now known to be the location of the 17/5.8/26S rDNA (hereafter termed 17/26S rDNA); this molecular information extends the NOR function to one of synthesizer as well as organizer. The extensive variation in ribosomal DNA (rDNA) multiplicity and the finding that much of the rDNA is in the NOR-
R. L. Phillips +3 more
openaire +1 more source
The nucleolus organizer region (NOR) of maize chromosome 6 is now known to be the location of the 17/5.8/26S rDNA (hereafter termed 17/26S rDNA); this molecular information extends the NOR function to one of synthesizer as well as organizer. The extensive variation in ribosomal DNA (rDNA) multiplicity and the finding that much of the rDNA is in the NOR-
R. L. Phillips +3 more
openaire +1 more source
Replicon size of yeast ribosomal DNA
Molecular and General Genetics MGG, 1984The ribosomal RNAs of the yeast Saccharomyces cerevisiae are transcribed from a 9K bp stretch of DNA which is reiterated about 120-fold in a continuous array, about 360 microns long, on chromosome XII. Although ARS activity has been detected in the repeat unit, the size and disposition of replicons along this array of identical genes has not hitherto ...
Walmsley, Richard M. +3 more
openaire +3 more sources
Journal of Molecular Biology, 1980
Abstract We have analysed the ribosomal DNA of Calliphora erythrocephala, a Dipteran fly of the same sub-order as Drosophila melanogaster, through a series of rDNA † fragments cloned in a plasmid vector. We have mapped the sites for eight restriction enzymes within these plasmids, and positioned the regions coding for the 18 S and 28 S rRNAs within ...
K, Beckingham, R, White
openaire +2 more sources
Abstract We have analysed the ribosomal DNA of Calliphora erythrocephala, a Dipteran fly of the same sub-order as Drosophila melanogaster, through a series of rDNA † fragments cloned in a plasmid vector. We have mapped the sites for eight restriction enzymes within these plasmids, and positioned the regions coding for the 18 S and 28 S rRNAs within ...
K, Beckingham, R, White
openaire +2 more sources
Ribosome cycle emerges from DNA replication
Nature Reviews Molecular Cell Biology, 2017A modification of Meselson and Stahl's density gradient centrifugation method and a rare Texan yeast helped show that eukaryotic ribosomes dissociate and reform during translation.
openaire +2 more sources
The evolution of eukaryotic ribosomal DNA
Biosystems, 1986Mutations occur randomly throughout the ribosomal DNA (rDNA) sequence. Molecular drive (unequal crossing-over, gene conversion, and transposition) spreads these variations through the multiple copies of rDNA. Forces of selection act upon the variants to favor and fix them or disfavor and eliminate them.
openaire +2 more sources