Fine structure of chromosomes

De, D. N., Kaufmann, B. P. (July 1956) Fine structure of chromosomes. J Biophys Biochem Cytol, 2 (4 Supp). pp. 419-24. ISSN 0095-9901 (Print)0095-9901 (Linking)

DOI: 10.1083/jcb.2.4.419


Electron micrographs of staminate hair cells of Tradescantia reflexa indicate that early prophase chromosomes are composed of a number of helically arranged chromonemata. Favorable preparations reveal as many as 64 identifiable subsidiary strands, assumedly arranged as intertwined pairs to form a hierarchy of pairs of pairs. The helices of the smallest discernible units have a diameter of about 125 A, with highly electron-scattering material disposed peripherally around a less dense "core." The wall of this peripheral ring has a thickness of about 40 A, and apparently represents another pair of coiled threads surrounding a 40 A central axis. The implications of the findings are discussed briefly.

Item Type: Paper
Uncontrolled Keywords: Animals *Chromosomes *Electrons *Hair Cells, Auditory *Helix (Snails) *Microscopy *Microscopy, Electron
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > chromosomes, structure and function
CSHL Authors:
Communities: The Carnegie Institution Department of Genetics
Depositing User: Matt Covey
Date: 25 July 1956
Date Deposited: 22 Jan 2018 19:26
Last Modified: 22 Jan 2018 19:26
PMCID: PMC2229701
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