Experiments in grafting Hydra
نویسندگان
چکیده
منابع مشابه
Induction of secondary axis in hydra revisited: New insights into pattern formation
In 1909, several years before the famous `Organizer’ experiments of Spemann and Mangold, Ethel Browne demonstrated induction of a secondary axis in hydra by grafting a hypostome. Based on this and subsequent work, in the late sixties, Lewis Wolpert proposed the theory of morphogen gradients and positional information. We have studied secondary axis induction by hypostome and foot tissue using t...
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Morphogenetic inhibitory gradients were produced in Hydra viridis having 2-5 gastric regions or 2-5 peduncles grafted in tandem. The frequency of head regeneration at graft borders changed as a function of distance from the terminal head, and the frequency of foot regeneration changed as a function of distance from the terminal foot. The object of the study was to characterize and compare these...
متن کاملHydra
What is Hydra? Hydra is a member of the animal phylum Cnidaria. This phylum includes corals, sea anemones and jellyfish. While most cnidarians are marine, Hydra is unusual in that it lives exclusively in fresh water. Hydra was first described by Antoni van Leeuwenhoek (1632– 1723) in a letter he sent to the Royal Society on Christmas day, 1702. The letter included a red chalk drawing of Hydra o...
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The results of three groups of experiments on the control of foot (basal disk) differentiation in Hydra viridis are well predicted by mathematical models of remarkable simplicity. In each of the experiments, a group of cells, called the actor, may or may not form a foot. The probability of foot formation is influenced by actor-specific properties and by properties of the rest of the animal, whi...
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ژورنال
عنوان ژورنال: Archiv für Entwickelungsmechanik der Organismen
سال: 1901
ISSN: 0949-944X,1432-041X
DOI: 10.1007/bf02161990