. Analysis of development. Embryology; Embryology. Zooid Inhibitor accumulates in center, C, where four sources are in close proximity. By COp. 7 Stolon C02,urea, uric acid permit stolon growth but inhibit zooid formation. Fig. 231. lizing common substrates and by excreting common inhibitory substances. Now, if the two groups of cells, A and B, differ initially by some quantitative factor in their chemical make-up, then A may be better equipped to utilize substrates and resist inhibitory com- pounds as compared with B. Therefore, A may inhibit the regeneration of B and differ- ent structures w
. Analysis of development. Embryology; Embryology. Zooid Inhibitor accumulates in center, C, where four sources are in close proximity. By COp. 7 Stolon C02,urea, uric acid permit stolon growth but inhibit zooid formation. Fig. 231. lizing common substrates and by excreting common inhibitory substances. Now, if the two groups of cells, A and B, differ initially by some quantitative factor in their chemical make-up, then A may be better equipped to utilize substrates and resist inhibitory com- pounds as compared with B. Therefore, A may inhibit the regeneration of B and differ- ent structures will result at A and B. The initial difference between A and B would be derived from a gradient in the whole or- stem of such a length and age that regenera- tion always occurs at the distal (apical) end but not at the proximal (basal) end. It is only necessary to make a ligature at the middle of such stems and then both ends form hydranths. What are the effects of tying a ligature? The tissue is constricted and separated at the ligature so that circu- lation between the two ends is stopped. Neither inhibitory substances nor substrates can pass from the apical end to the basal. 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 Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
Size: 2393px × 1044px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherphiladelphi, booksubjectembryology
