Stephanopyxis turris (Centrales) - Geschlechtliche Fortpflanzung; Differenzierung der Oogonien, Auxosporenbildung

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Formal Metadata

Title
Stephanopyxis turris (Centrales) - Geschlechtliche Fortpflanzung; Differenzierung der Oogonien, Auxosporenbildung
Alternative Title
Stephanopyxis turris (Centrales) - Sexual Reproduction; Differentiation of Oogonia, Forming of Auxospores
Author
License
CC Attribution - NoDerivatives 3.0 Germany:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Identifiers
IWF Signature
E 1344
Publisher
Release Date
1969
Language
Silent film
Producer
IWF (Göttingen)
Production Year
1967

Technical Metadata

IWF Technical Data
Film, 16 mm, 103 m ; SW, 9 1/2 min

Content Metadata

Subject Area
Abstract
Kieselalge. Erste und zweite meiotische Kernteilung, jeweils mit einem pyknotischen Tochterkern, Kernwanderung. Öffnen des eineiigen Oogons, Eindringen eines Spermiums. Befruchtung, Anschwellen der Zygote zur Auxospore, Bildung einer Erstlingszelle aus der Auxospore durch sukzedane Abscheidung zweier Schalen, vegetative Vermehrungsteilung. Mit Zeitraffung.
The oogonia of the Stephanopyxis turris, are formed directly from the vegetative cells. Pronounced longitudinal growth is followed by the two meiotic divisions of the nucleus; there are no cytokinesis. After each division of the nucleus one of the daughter nuclei becomes pycnotic. The one-egged oogon opens up and is fertilized by a spermium. The zygote swells up to form the auxospore, increasing significantly in volume. By succedaneous secretion of two shells the first cell emerges from the auxospore; this cell grows to become the colony of a new clone.
Keywords Algen / Kieselalge Kieselalge Stephanopyxis turris Fortpflanzung, geschlechtliche / Chrysophyceae Befruchtung / Chrysophyceae fertilization / Chrysophyceae reproduction, sexual / Chrysophyceae Stephanopyxis turris diatom algae Encyclopaedia Cinematographica

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