Stephanopyxis turris (Centrales) - Geschlechtliche Fortpflanzung; Differenzierung der Spermien

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Formal Metadata

Title
Stephanopyxis turris (Centrales) - Geschlechtliche Fortpflanzung; Differenzierung der Spermien
Alternative Title
Stephanopyxis turris (Centrales) - Sexual Reproduction; Differentiation of Male Gametes
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 1343
Publisher
Release Date
1969
Language
Silent film
Producer
IWF (Göttingen)
Production Year
1967

Technical Metadata

IWF Technical Data
Film, 16 mm, 89 m ; SW, 8 1/2 min

Content Metadata

Subject Area
Abstract
Kieselalge. Bildung von vier oder acht beschalten Spermatogonien durch zwei oder drei Differenzierungsteilungen in der Mutterzelle, Bildung von vierkernigen Spermatozyten durch zwei meiotische Teilungen (keine Zytokinese), Differenzierung der eingeißeligen, plastidenfreien Spermien. Mit Zeitraffung.
The formation of male gametes of the Stephanopyxis turris is initiated by two or three differentiating divisions. From this, four or eight spermatogoni with shells emerge, enclosed in the mother cell. These enter into meiosis as spermatocytes. Since there is no cytocinesis, thw two meiotic divisions yield spermatocytes with four nuclei. Sperms with one flagellum and without plastides are formed. The main part of the plasma of the spermatocytes as well as all plastides are left behind in residual bodies.
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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