. The biology of Stentor. Stentor. ACTIVATION AND INHIBITION: ORAL PRIMORDIUM 147 A. Fig. 37. Oral inhibition of primordium development. A. Stage-2 regenerator is recapped with head from another stentor. By handling only pendent portion of donor, which is subsequently excised (a), injury to feeding organelles is prevented, b: Development is stopped and the anlage resorbed. This occurs neither on injury, alone, of regenerator nor after implanting tail poles; therefore a specific inhibition by formed oral structures. Most specimens reorganized later {c, d), and some divided instead. B. When prim
. The biology of Stentor. Stentor. ACTIVATION AND INHIBITION: ORAL PRIMORDIUM 147 A. Fig. 37. Oral inhibition of primordium development. A. Stage-2 regenerator is recapped with head from another stentor. By handling only pendent portion of donor, which is subsequently excised (a), injury to feeding organelles is prevented, b: Development is stopped and the anlage resorbed. This occurs neither on injury, alone, of regenerator nor after implanting tail poles; therefore a specific inhibition by formed oral structures. Most specimens reorganized later {c, d), and some divided instead. B. When primordium was already at stage 4, it was not resorbed (a) and served for reorganizational replacement of the grafted feeding organelles. (After Tartar, 1958c.) Reorganization and division would then be like regeneration in that the oral structures may be "self-excised", and if so, the regeneration response to cutting off the head or mouthparts would be not so much an adaptive behavior as a gross imitation or artificially induced performance of something that happens cryptically in the recurring processes of fission and reorganization. This in turn would at last answer Gruber's (1885a) question why stentors should be so capable of regenerating from injuries such as they are not likely to encounter in nature, as well as explain to a considerable extent his original conception of the close similarity between regeneration and division, a point repeatedly emphasized by later students of ciliate morphogenesis (see Balamuth, 1940). We need to learn how these formed feeding organelles exert the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tartar, Vance, 1911-. New York, Pergammon Press
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