. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ALI ORECOGNIT10N IN SPONGE 275 t , £t. w* on Figure 7. Rejection reaction in a four-day allogeneic of Lcuauuira uhriil\h. The aggregates of the degenerated archeocyles have split off. Scale bar = 100 ^m. Figure 8. A large aggregate of degenerated cells in a four-day allo- geneic combination. Scale bar = 50 ^m. cell accumulation, cytotoxic reactions are evident, because numerous cells show degenerative nuclear condensation. The cytotoxic reaction mediated by the archeocytes ap- parently begins soon after they acc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ALI ORECOGNIT10N IN SPONGE 275 t , £t. w* on Figure 7. Rejection reaction in a four-day allogeneic of Lcuauuira uhriil\h. The aggregates of the degenerated archeocyles have split off. Scale bar = 100 ^m. Figure 8. A large aggregate of degenerated cells in a four-day allo- geneic combination. Scale bar = 50 ^m. cell accumulation, cytotoxic reactions are evident, because numerous cells show degenerative nuclear condensation. The cytotoxic reaction mediated by the archeocytes ap- parently begins soon after they accumulate and make cell contact. Two days after the allogeneic sponge pieces had been bound, external signs of rejection are already evident. The fused pinacoderm begins to break along the boundary between the sponge pieces. Figure 5 shows massive ac- cumulations of archeocytes in the contact region. Within this cell accumulation, tissue degeneration is obvious, and the sponge pieces begin to split oft" (Fig. 6, enlargement). Nuclear condensation is clearly visible in the degenerated cells. Phagocytosis is already discernible, and phagocytes that had engulfed several degenerated cells can be seen. Four days after binding, extensive necrotic tissue (about mm thick) is visible between allogeneic sponge pieces. Because it has become frail, the sponge pieces fall apart if the binding thread is removed (Fig. 7). The necrosis is, however, limited to the contact region, and the sponge tissues external to it show no degenerative signs. Thus, archeocytes, at least at four days, had apparently not in- vaded far into the allogeneic tissues. In the necrotic cell. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). A
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
