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Studies on the resting cyst of ciliated protozoan Colpoda cucullus: resistance to temperature and additional inducing factors for en-or excystment


Studies on the resting cyst of ciliated protozoan Colpoda cucullus: resistance to temperature and additional inducing factors for en-or excystment



Journal of Protozoology Research 15(1/2): 7-13



The resting cysts of Colpoda cucullus were resistant to not only drying, but high and low temperatures. The critical temperatures for the survival of wet cysts ranged from 40[degree]C (3-hr exposure) to 45 T (10-min exposure), and those of the dried cysts ranged from 80 T (3-hr exposure) to 100[degree]C (30-min exposure). 2+ Frozen (-30[degree]C, 3 hr) and remelted wet cysts also survived. Ca2+-induced resting cysts excysted when the external Ca2+ was removed. However, the excystment-inducing effect by Ca2+ removal was canceled by the addition of cations such as Na+, K+, and Mg2+ in the surrounding medium. When the mature cysts transformed in a diluted buffer without any other salts were temporally exposed to Ca2+ and subsequently resuspended in the buffer without Ca2+, excystment was induced in a majority of cysts. The addition of chlorophyll-derived molecules in the surrounding medium induced excystment, but suppressed encystment. This suggests that the excystment-inducing and encystment-suppressing activities of cereal infusion are attributed to water-soluble porphyrins derived from chlorophyll. The encystment was induced when the vegetative cells were suspended at a high density and the substitution of non-living particles such as polystyrene latex particles (PLP) for the living cells also showed an encystment-inducing effect. The result suggests that mechanical cell-to-cell contact induces encystment.

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