. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISINTEGRATION OF HYDRA NEMATOCYSTS 397 (x103) 25 S 1 •V» ^\J •fc U) ^\!r "o 5 15 • c Of 0) E 10 — * c 0 E (A o 0 5 -. 0 20 50 75 ( h ) Duration of PG treatment FIGURE 3. Effect of 2 mM PG on the desmonemes of hydra tentacles and hypostome with blocked supply of new desmonemes. Hydras in Control-I (O) and PG-I (A) were cut just under the hypostome immediately before counting, while animals in Control-II (•) and PG-II (A) were cut just before the PG-treatment (at time 0), to block the supply of new nematocysts. Control-I
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISINTEGRATION OF HYDRA NEMATOCYSTS 397 (x103) 25 S 1 •V» ^\J •fc U) ^\!r "o 5 15 • c Of 0) E 10 — * c 0 E (A o 0 5 -. 0 20 50 75 ( h ) Duration of PG treatment FIGURE 3. Effect of 2 mM PG on the desmonemes of hydra tentacles and hypostome with blocked supply of new desmonemes. Hydras in Control-I (O) and PG-I (A) were cut just under the hypostome immediately before counting, while animals in Control-II (•) and PG-II (A) were cut just before the PG-treatment (at time 0), to block the supply of new nematocysts. Control-I and -II were not treated with PG. hydras. This shows that the number of discarded desmonemes is negligibly small. The sum of retained and discarded desmonemes in treated hydras decreased mark- edly compared to controls. Thus, the decrease in desmonemes was not due to their discharge, but due to disintegration in living hydras. Hydra with a few drops of 2 mM PG-solution were placed on a glass slide, and nematocysts were discharged by touching the hydra with a glass rod. The discharged nematocysts were observed under the microscope for 3 days. The nematocysts remained unchanged and did not disintegrate by direct action of PG. Thus, PG may act on a mechanism which maintains mature desmonemes in the living hydras, and the desmonemes may be degraded by metabolic action of living cells. This is supported by the fact that many small objects thought to be degrading capsules were observed in the living tentacles of PG-treated hydra (Fig. Ib) and in the solution where PG-treated hydras were dissolved by 2% SDS (Fig. 5b).. 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. ). Annual report 1907/08-1952; Lillie, F
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
