Abstract
Vacuole passage time (VPT) and digestion time (DT) in the heterotrichous marine ciliateFabrea salina (Henneguy) (from cultures) were measured in 1986 under different food concentrations, using epifluorescence microscopy, and employing fluorescent particles andRhodomonas lens as tracers. Both VPT and DT were unaffected by food concentrations ranging form 0 to 106 cells ml−1 and can be treated as constants (120.0 and 71.2 min, respectively). Vacuole life expectancy may be related to the ingestion-rate-determining need forde novo membrane synthesis and “old” vacuole membrane recycling which feeds new endocytotic vacuole production. Both processes are enzyme-controlled, which would explain the observations of other investigators that at least in certain ciliates digestion time is responsive to changes in temperature.
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Communicated by J. Grassle, New Brunswick
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Capriulo, G.M., Degnan, C. Effect of food concentration on digestion and vacuole passage time in the heterotrichous marine ciliateFibrea salina . Mar. Biol. 110, 199–202 (1991). https://doi.org/10.1007/BF01313705
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DOI: https://doi.org/10.1007/BF01313705