منابع مشابه
Mononucleotides of the Cell Nucleus
1. It has been demonstrated by ion exchange chromatography that the cell nucleus contains mononucleotides of adenine, guanine, cytosine, uracil, together with diphosphopyridine nucleotide, and several uridine diphosphate derivatives; the adenine nucleotides predominating in amount. Nucleotide components in the cell nucleus are in close agreement both quantitatively and qualitatively with those ...
متن کاملEditorial overview: Cell nucleus: the nucleus: a dynamic organelle.
The nucleus is perhaps the defining feature of ‘eukaryotes’ (Greek ‘eu-’ (with) ‘-karyon’ (kernel, nucleus)), and the emperor of all eukaryotic organelles in terms of scale and complexity of organization. It is, of course, the repository for almost all genomic information, encoded in DNA sequences wrapped into chromatin as discrete polymer packages termed chromosomes, surrounded in turn by a do...
متن کاملThe reactivation of the red cell nucleus.
When the nucleus of a mature hen erythrocyte is introduced into the cytoplasm of a HeLa cell it resumes the synthesis of RNA and DNA. This reactivation of the red cell nucleus in the heterokaryon is associated with a marked increase in its volume. There is a direct relationship between the volume of the nucleus and the amount of RNA which it makes. The nuclear enlargement is not a consequence o...
متن کاملAtomic force microscopy of the cell nucleus.
In mammals and plants, the cell nucleus is organized in dynamic macromolecular domains involved in DNA and RNA metabolism. These domains can be visualized by light and electron microscopy and their composition analyzed by using several cytochemical approaches. They are composed of chromatin or ribonucleoprotein structures as interchromatin and perichromatin fibers and granules, coiled bodies, a...
متن کاملProspects for reassembling the cell nucleus.
I N T R O D U C T I O N The nucleus is the information centre of the eukaryotic cell. Not only does it synthesize the mRNA for thousands of proteins, but it supplies regulated amounts of each mRNA to the cytoplasm. In addition it must replicate its entire structure accurately each cell cycle. The human genome contains l ‘8 m of DNA, so that an average human chromosome contains 40 mm of DNA in w...
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ژورنال
عنوان ژورنال: BMJ
سال: 1987
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.295.6606.1121