منابع مشابه
Experimental studies on axial polarity in hydra.
There is evidence which suggests that the polarity of regeneration in hydra is determined by axial gradients of some sort. The mechanisms which may be involved in the establishment and maintenance of the gradients have been investigated by studying the reversal of polarity in graft combinations. Complete polarity reversal can be effected by a grafted hypostome or by a grafted hypostome and pedu...
متن کاملExperimental studies on axial polarity in hydra By OWEN
There is evidence which suggests that the polarity of regeneration in hydra is determined by axial gradients of some sort. The mechanisms which may be involved in the establishment and maintenance of the gradients have been investigated by studying the reversal of polarity in graft combinations. Complete polarity reversal can be effected by a grafted hypostome or by a grafted hypostome and pedu...
متن کاملStudies on pattern regulation in hydra
In a previous paper (Webster & Wolpert, 1966 a) it was shown that during regulation the time required for the determination of the dominant region, the hypostome, was dependent on the original position of the hypostome-forming region on the linear axis. Hypostome determination occurred more quickly from distal than from proximal regions, suggesting an axial gradient. As Spiegelman (1945) has po...
متن کاملStudies on pattern regulation in hydra II . Factors
In a previous paper (Webster & Wolpert, 1966 a) it was shown that during regulation the time required for the determination of the dominant region, the hypostome, was dependent on the original position of the hypostome-forming region on the linear axis. Hypostome determination occurred more quickly from distal than from proximal regions, suggesting an axial gradient. As Spiegelman (1945) has po...
متن کاملStudies on the transmission of hypostome inhibition in hydra.
The inhibition of hypostome formation in hydra has been investigated using isolation and transplantation techniques. The transmission of inhibition does not seem to be polarized; a hypostome situated at the proximal end of the digestive zone can inhibit distal regeneration with no change in regeneration polarity. The time required for the proximal hypostome to establish an effective inhibitory ...
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ژورنال
عنوان ژورنال: Archiv für Entwicklungsmechanik der Organismen
سال: 1897
ISSN: 0949-944X,1432-041X
DOI: 10.1007/bf02161960