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Development Genes and Evolution
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Regeneration in Tubularia

Authors: Morgan, T. H.;

Regeneration in Tubularia

Abstract

1) Kurze Stammstucke von Tubularia bringen oft nur Theile des ganzen Hydranten hervor, vgl. Fig.B–G, oft auch doppelte Theile, vgl. Fig.H–K. Die Tendenz, einen Theil eines Hydranten zu bilden (Fig.B–G), ist bei kleinen Stucken vom distalen Ende des Stockes ausgesprochener, kann aber nicht mit Hilfe des rothen Pigments erklAt werden, das dabei etwa als Bildner auftrAte. 2) Es giebt keinen direkten Zusammenhang zwischen der schrAgen Stellung der Tentakelanlagen in einem schrAg abgeschnittenen Stuck und der schrAgen Stellung des neugebildeten Hydranten. Die Stellung des Hydranten ist das Ergebnis aus negativem Stereotropismus. 3) Die Entwickelung eines Theiles eines Hydranten aus kleinen Stucken scheint mit der geringen Gro\e des betreffenden Stuckes zusammenzuhAngen, oder mit anderen Worten, aus einem Stuck geht eine gro\e unvollendete, nicht eine kleine vollendete Struktur hervor, d. h. eine gro\er angelegte Organisation, obgleich nur ein Theil einer ganzen, wird hervorgebracht an Stelle einer vollstAndigen Organisation von geringerer Gro\e. Der Faktor, welcher die Entscheidung zwischen den verschiedenen Moglichkeiten bedingt, ist noch nicht gefunden. 4) Es giebt eine Minimalgro\e der Stucke, unterhalb welcher weder ein Hydrant noch ein Theil eines solchen zur Entwickelung gelangt.

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citations
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popularity
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influence
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impulse
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