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70% of the tail was removed in larvae of Xenopus laevis at stage 48 (according to Nieuwkoop and Faber) in order to: a) analyze the course of the regeneration process of the spinal cord in the tail; b) accertain the morphogenetic potential of the ependymal cells which replace the spinal cord experimentally removed; c) compare the regeneration capacity of this Anuran with that of the Urodela which is already known. Morphogenetics phenomena noted in the days immediately following the operation are...
The experiments in this work were designed to study the regenerative capacity of caudal spinal cord in larval Xenopus laevis at stages near to metamorphosis. 70% of the tail was removed in larval Xenopus laevis at stage 56-57 (acc.to Nieuwkoop and Faber, 1956). The experimental animals were reared in 0.01% solution of PTU (4(6)- Propyl-2-thiouracil) in order to inhibit metamorphosis, and sacrificied after 3-5 months. The results obtained demonstrated that: a) the regenerated spinal cord of the tadpoles...
Lens capsule epithelium fragments were left in the eye of adult specimens of Rana esculenta. The histological data demonstrated that the lens capsule epithelium fragments can form epithelial vescicles where the cells start to divide; afterwards, the cells situated in the posterior part of the vesicle become elongated, differentiating into fibers.
In the present work, tadpoles of Xenopus laevis were submitted to successive removal of 70% of the tail. The structure of the regenerated spinal cord and the evolution of the regenerative process was compared with, those of tadpoles submitted to one amputation. The results obtained demonstrated that: 1) Either after one amputation or after two or three amputations, the regenerative process exhibits the same phases: a) migratory phase, b) multiplicative phase, c) differentialve phase. 2) Either...
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