| Author Title Journal |
Sivickis PB (1931) Morfogenesio kilmes beieskant. [Question of morphogenesis] Kosmos 1931(9): 345-359 |
Abstract / Notes
Planaria lugubris, cut into 6 pieces, develops its eyes at definite lengths of time which vary according to the level of the body from which the pieces were taken. The anterior pieces require the shortest time (ca. 80 hrs.) and the posterior, the longest (ca. 190 hrs.). A large lot of animals were decapitated practically simultaneously and then allowed to regenerate their heads. At definite intervals, lots of 50 of these worms were cut into 6 pieces as in the normal animals, and allowed to regenerate. This operation markedly changed the internal factors concerned in regeneration. Up to 170 hrs. after decapitation there was a gradual increase in the time required for regeneration of eyes. About this time a break occurred and after 170 hrs. the time required began to return to that required in controls. The theoretical interpretation is discussed.| Home page -- (Main hierarchy) |