The Conception of the Satellite and the Nucleolus, and the Behaviour of these Bodies in Cell Division1

Mensinkai, S. W.

doi:10.1093/oxfordjournals.aob.a085089

Cited by 23 publications

(5 citation statements)

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“…1 to 3). However, the great majority of the nucleoli observed showed a number of lighter spaces of various sizes the largest of which might possibly correspond to the vacuoles previously reported (9)(10)(11)(12)(13)21). Although some of these light spaces appear structureless, if not empty, they are not necessarily so in the living 782 NUCLEOLUS IN MERISTEMATIC CELLS state: their content is probably extracted during the preparation procedures.…”

Section: The Structure Of the Nucleolussupporting

confidence: 52%

Structure and Mode of Formation of the Nucleolus in Meristematic Cells of Vicia faba and Allium cepa

Lafontaine

1958

The Journal of Cell Biology

119

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Interphase nucleoli from Vicia faba and Allium cepa meristematic cells are roughly classified into two categories: (a) those that commonly show a rather homogeneous texture (except for small light spaces of various sizes) and frequently contain dense particles 140 A in diameter; (b) those found more frequently in Vicia characterized by a very sharp boundary between a dense outer cortex and a much fighter central core. The dense particles are not found in such nucleoli. In Allium the boundary is more irregular and dense particles are sometimes observed in the outer layer. Many nucleoli show a structure intermediate between these two types. They are characterized by a gradient of increasing density from the center to the periphery and occasionally contain dense 140 A granules.During interphase, certain nucleoli are closely associated with segments of chromatin strands which undoubtedly represent nucleolar organizing regions.The dense 140 A granules are followed during the mitotic cycle. In Allium,

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Section: The Structure Of the Nucleolussupporting

confidence: 52%

Structure and Mode of Formation of the Nucleolus in Meristematic Cells of Vicia faba and Allium cepa

Lafontaine

1958

The Journal of Cell Biology

119

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“…There is a close correlation between the size of the developing nucleolus and the length of the secondary constriction or satellite stalk (Matsuura, 1938). The nucleolus also appears to remain firmly attached to its nucleolus-organizer from the time of its formation until the time of its disappearance at prophase (Mensinkai, 1939). Navashin (1934) showed that the number of functioning nucleolus-organizers in the cell may be determined by counting the number of nucleoli a t telophase.…”

Section: Discussionmentioning

confidence: 99%

The association of satellited chromosomes with specific chromosomal regions in cultured human somatic cells

Ferguson‐Smith

Handmaker

1963

Annals of Human Genetics

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SUMMARY The associations of satellited chromosomes with other chromosomes have been determined in photomicrographs of 423 human somatic cells in mitosis. It is found that the frequency with which a satellited chromosome lies in juxtaposition to a particular chromosome is not purely a function of the length of that chromosome (as might be expected if the assumption were true that satellited chromosomes are distributed at random throughout the cell.) The non‐random distribution of satellited chromosomes uncovered by the study is attributed to associations at specific chromosome regions. The most common association was the well‐known and often multiple one occurring between the short arms of satellited chromosomes. A relatively high frequency of associations also occurred between the short arms of satellited chromosomes and specific non‐satellited regions of chromosomes 2, 6, 18, 19, 21 and/or 22. Much less frequent associations occurred also with specific regions of chromosomes 1, 3 and 17. A feature common to all significant associations is that they tend to occur close to sites where secondary constrictions have been demonstrated. This finding suggests that these associations may indicate the position of active nucleolus‐organizer sites. It is also postulated that chromosome associations are the result of nucleolus fusion during interphase. Evidence from organisms other than man is presented in support of the hypothesis that a tendency to chromosome association between ‘nucleolar chromosomes’ may be a general phenomenon. The possible implications of chromosome association with respect to the aetiology of human chromosomal aberrations is discussed. The writers are grateful to Dr James H. Renwick for suggestions on the presentation of the data, and to Marie E. Ferguson‐Smith for preparing the figures. This investigation was supported in part by Research Grant 7841 from the Division of General Medical Sciences, the United States Public Health Service.

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“…Thus the number of nucleoli in the cells was considered a reliable guide to the polyploidy of the plant. This idea is reffected in the later work on species of Allium by Mensinkai (1939), Oryza and Triticum by Pathak (1940) and Brassica by Sikka (1940). The presence of six nucleoli in the somatic nucleus of Hibiscus trionum naturally suggests its hexaploid nature.…”

Section: Discussionmentioning

confidence: 99%

CYTOLOGY OF HIBISCUS TRIONUM L.¹

Rao

1941

New Phytologist

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The Conception of the Satellite and the Nucleolus, and the Behaviour of these Bodies in Cell Division1

Cited by 23 publications

References 0 publications

Structure and Mode of Formation of the Nucleolus in Meristematic Cells of Vicia faba and Allium cepa

Structure and Mode of Formation of the Nucleolus in Meristematic Cells of Vicia faba and Allium cepa

The association of satellited chromosomes with specific chromosomal regions in cultured human somatic cells

CYTOLOGY OF HIBISCUS TRIONUM L.¹

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The Conception of the Satellite and the Nucleolus, and the Behaviour of these Bodies in Cell Division1

Cited by 23 publications

References 0 publications

Structure and Mode of Formation of the Nucleolus in Meristematic Cells of Vicia faba and Allium cepa

Structure and Mode of Formation of the Nucleolus in Meristematic Cells of Vicia faba and Allium cepa

The association of satellited chromosomes with specific chromosomal regions in cultured human somatic cells

CYTOLOGY OF HIBISCUS TRIONUM L.1

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CYTOLOGY OF HIBISCUS TRIONUM L.¹