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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Zeitschrift für Morp...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
Zeitschrift für Morphologie der Tiere
Article . 1972 . Peer-reviewed
License: Springer Nature TDM
Data sources: Crossref
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Eibildung und furchung von Trichoplax adhaerens F. E. Schulze (Placozoa)

Authors: Karl G. Grell;

Eibildung und furchung von Trichoplax adhaerens F. E. Schulze (Placozoa)

Abstract

1. Von Trichoplax adhaerens wurden zwei Klone gezuehtet. Der eine wurde 1969 (Klon I), der andere 1971 isoliert (Klon II). 2. Bei einer bestimmten Populationsdichte setzt eine degenerative Phase ein, die aus einem reversiblen und einem irreversiblen Abschnitt besteht. Werden die Tiere nicht rechtzeitig in eine frische Kulturschale ubertragen, so gehen sic zugrunde. 3. Der Ubergang in die degenerative Phase bildet die wesentliche Voraussetzung fur die Eibildung. 4. Obwohl in einem der beiden Klone vereinzelt auch eine spontane Eibildung beobachtet wurde (Klon I), fand sic in groserem Umfang erst statt, wenn beide Klone miteinander vermischt wurden. 5. Der klonale Unterschied entspricht keiner sexuellen Differenzierung; durch Vermischen beider Klone wurde auch in Klon II eine Eibildung induziert, indem sie bisher noch nicht spontan aufgetreten ist. 6. Spermien konnten noch nicht eindeutig identifiziert werden. Far das Vorkommen einer Befruchtung spricht aber, das sich nur Eier weiterentwickeln konnen, die eine besondere Hulle (“Befruchtungsmembran”) ausgebildet haben. 7. Die Furchung ist total-aqual. Unter den derzeitigen Kulturbedingungen sterben alle Furchungsstadien fruher oder spater ab. Das Ergebnis der Embryonalentwicklung ist daher noch unbekannt.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
41
Top 10%
Top 10%
Average
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