CYTOCHEMICAL EVIDENCE FOR THE APPARENT ABSENCE OF HISTONE IN THE CELLS OF CYANOPHYCEAE.
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Cell Biology↗
Biomedical subjects
D N DE
Publications and source records attributed to D N DE.
Developmental changes in the submicroscopic morphology of the cytoplasmic components during microsporogenesis in Tradescantia.
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Cytoplasm↗
Pollen tube mitosis without culture medium: metaphase arrest by acenaphthene.
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Acenaphthenes↗
Ultrastructure of nuclear membrane of plant cells.
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Cell Nucleus↗
Fine structure of chromosomes.
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.
Animals↗