Nuclear rDNA inEuglena gracilis: paucity of chromosomal units and replication of extrachromosomal units
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چکیده
منابع مشابه
Extrachromosomal circular nuclear rDNA in Euglena gracilis.
The presence of extrachromosomal nuclear ribosomal DNA (rDNA) in the unicellular alga Euglena gracilis has been established. This rDNA is circular. Each circle is 3.8 micron long and contains one rDNA unit. Oligomers are rare. Extrachromosomal rDNA is present in large amounts during the exponential phase of growth and appears less abundant during the stationary phase. It was found in all wild-t...
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چکیده ندارد.
15 صفحه اولUnits of chromosome replication and packing.
Fusion between mitotic and S-phase cells induces the formation of prematurely condensed chromosomes (PCC) in the interphase partner. Viewed in the light microscope, S-phase PCC derived from the Indian muntjac appear to be fragmented and heterogeneous. In scanning electron micrographs prepared by an osmium impregnation technique, which avoids the need to sputter-coat the specimen, the S-phase fr...
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DNA replication occurs in mammalian cells at so-called replication foci occupying defined nuclear sites at specific times during S phase. It is an unresolved problem how this specific spatiotemporal organization of replication foci is determined. Another unresolved question remains as to what extent DNA is redistributed during S phase. To investigate these problems, we visualized the replicatin...
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Transcriptional status of two intra-genomic ITS variants (Type-I and Type-II) identified in Vigna unguiculata ssp. tenuis (NI 1637) was analysed by RT-PCR. Total RNA was isolated from leaves, stem and roots of 15-day old seedlings and was reverse transcribed using specific primers for amplifying ITS-1 and ITS-2. Gel electrophoresis on a high-resolution agarose revealed that only Type-II variant...
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ژورنال
عنوان ژورنال: Nucleic Acids Research
سال: 1988
ISSN: 0305-1048,1362-4962
DOI: 10.1093/nar/16.11.4801