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Lehrbuch Der Vergleichenden Entwicklungsgeschichte Der Wirbellosen Thiere, Vol. 2: Specieller Theil (Classic Reprint): Specieller Theil (Classic Reprint)

Lehrbuch Der Vergleichenden Entwicklungsgeschichte Der Wirbellosen Thiere, Vol. 2: Specieller Theil (Classic Reprint): Specieller Theil (Classic Reprint)

          
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About the Book

Excerpt from Lehrbuch der Vergleichenden Entwicklungsgeschichte der Wirbellosen Thiere, Vol. 2: Specieller Theil

Es ist noch nicht allgemein anerkannt, dass die Deutung dieser Membran als Dotterhaut die richtige ist. Die Bildung derselben geht entweder in den unteren Abschnitten des Eileiters, oder erst nach erfolgter Eiablage (und der gleichzeitig eintretenden Befruchtung) vor sich. Schon claus hat die selbe vom Eie aus als Abscheidung oder Erh�rtung der Randschicht des Dotters entstehen lassen und dieselbe demnach als Dottermembran in An spruch genommen, w�hrend E. Van beneden (no. 1) ihre Entstehung von den Zellen des Follikels oder des Eileiterepithels (in jenen F�llen, in denen kein Follikel zur Ausbildung kommt) f�r wahrscheinlich hielt und demnach diese Membran als Chorion bezeichnete. Letztere Bezeichnung wurde von vielen neueren Autoren festgehalten. H. Blanc (no. 35) hat f�r diese Auf fassung angef�hrt, dass bei Cuma die fragliche Membran den Follikelzellen inniger adh�rirt, als der Eioberfl�che. Fur die Deutung dieser Membran als Dotterh�utchen, der sich auch ludwig anschloss, sprechen vor Allem die Be obachtungen von claus, welcher an Chondracanthus gleichzeitig mit dem Auf treten dieser Membran eine Verkleinerung des Eivolumens durch Messung nachweisen konnte und die Beobachtungen grobben's an Cetochilus (no. Bei welcher Form diese Membran erst nach der Eiablage unter Auftreten einer �hnlichen Contraction des Bies gebildet wird. Diese Beobachtungen stehen in Uebereinstimmung mit denen weismanns, welcher fur verschiedene Cladoceren den Uebertritt des nackten Eies in den Brutraum und die erst sp�ter erfolgende Bildung der Dotterhaut beobachtete. Neuerdings hat della valle (no. 76) f�r Gammarus nachgewiesen, dass auch hier die Eier ohne H�lle in den Brutraum entleert werden und erst nach erfolgter Befruchtung die Dotterhaut ausscheiden.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9780282249496
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Height: 229 mm
  • Returnable: N
  • Width: 152 mm
  • ISBN-10: 0282249494
  • Publisher Date: 13 Sep 2018
  • Binding: Paperback
  • Language: German
  • Weight: 802 gr


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