Über den Aufbau der Speicheldrüsenkerne der Chironomuslarve

Erhard, H.

doi:10.1007/bf02989889

Cited by 12 publications

(4 citation statements)

References 3 publications

(1 reference statement)

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“…That there is still little agreement in regard to this important problem is shown by the relatively recent papers of Bonnevie (1908), von Herwerden (1910), Nawaschin (1911), Erhard (1910), Vejdovsky (1912), Lundegardh (1912a), Suessenguth (1921), and Martens (1922).…”

Section: No·7mentioning

confidence: 99%

“…Erhard's (1910) aberrant ideas as to the relation of the chromatin and the nucleus need hardly be considered. He describes the splitting-of the chromosomal disks as taking place at right angles to the long axis of the chromosomes, and further states that the cleft begins at the surface of the disk and proceeds toward the center without good evidence that he has actually observed the process.…”

Section: A Correlation Of These Findings With Others Of a Similar Natlrementioning

confidence: 99%

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THE STRUCTURE OF THE CHROMOSOMES IN TRADESCANTIA VIRGINICA L.

Sands¹

1923

American J of Botany

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Section: No·7mentioning

confidence: 99%

Section: A Correlation Of These Findings With Others Of a Similar Natlrementioning

confidence: 99%

THE STRUCTURE OF THE CHROMOSOMES IN TRADESCANTIA VIRGINICA L.

Sands¹

1923

American J of Botany

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“…Baranetzky also reports the same structure of the chromosomes for Agapanthus, Hemerocallis, Yucca, Hesperis, Lathyrus, and Pisum. Erhard's (1910) aberrant ideas as to the relation of the chromatin and the nucleus need hardly be considered.…”

mentioning

confidence: 99%

The Structure of the Chromosomes in Tradescantia virginica L.

Sands¹

1923

American Journal of Botany

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in the older literature are to be expected, for at the time, the steps in mitosis were not so specifically defined. In this description, reference is made to the individual chromosome and not to tetrads as such.My material was prepared by the modernized aceto-carmine method as described by Belling (I92Ib). Material was also fixed in Flemming's medium fluid followed by sectioning and staining. In addition to these methods, pollen mother cells were teased out on a slide into a 3 percent cane-sugar solution and studied in the living condition. The staminate hairs were suspended in 3 percent cane sugar, and the course of the divisions could be followed as described by Strasburger (Practicum, p. 604) for the staminate hairs of Tradescantia and by Lundegardh (I9I2b) for root-tip divisions. The temperature was satisfactory when between 75°and 80°F.The drawings of Plate XXIX were made entirely from aceto-carmine preparations. This is certainly a most valuable reagent for studying the chromatic elements of a cell to the exclusion of others. The solution may be employed in any dilution, and I found that for general purposes one drop of the modernized Schweigger-Seidel (1868) preparation added to one drop of water on a slide gave almost instantaneous staining.The fluid acts as a swelling agent, so that the preparations in a one-toone dilution go to pieces in about a week. For this reason, it is desirable to know how soon after treatment the chromosomes will show any particular stage in the swelling.The mother cells were teased from the anthers into a drop of water on a slide to which then was added, ordinarily, a drop of the aceto-carmine. The mount was made as described by Belling (1921bj, who first instructed me in the method. It was noted, in cases in which the stain was run under the cover glass, that about ten seconds were required to bring the chromosomes into the sharpest definition.The structure came out with the first swelling, somewhat as does the image on a photographic plate, without any perceptible change either in the form or in the position of the elements from that seen in the living condition. The first perceptible change can be noticed in about an hour, when the elements mayor may not appear a trifle swollen. When slight swelling' occurs, it affords considerable advantage for studying the morphological composition of the chromosomes.The figures given on the accompanying plates were, for the most part, made shortly after fixation, i.e., after some slight swelling had occurred.

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“…Once, it was disputed whether the cross striations make together a spiral (or spirals) along the periphery of the long axis of chromosome (v. Herweden 1910) or whether they are discs or rings placed almost percendicularly to the long axis of chromosome (Balbiani 1881, Leydig 1893, Erhard 1910, Bolsius 1911). …”

Section: Introductionmentioning

confidence: 99%

A Contribution to the Study of the Structure of the Salivary Gland Chromosome in <i>Chironomus</i>

Morita¹

1942

CYTOLOGIA

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Über den Aufbau der Speicheldrüsenkerne der Chironomuslarve

Cited by 12 publications

References 3 publications

THE STRUCTURE OF THE CHROMOSOMES IN TRADESCANTIA VIRGINICA L.

THE STRUCTURE OF THE CHROMOSOMES IN TRADESCANTIA VIRGINICA L.

The Structure of the Chromosomes in Tradescantia virginica L.

A Contribution to the Study of the Structure of the Salivary Gland Chromosome in <i>Chironomus</i>

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