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Natural preservation of corpses of Paramecium aurelia in cultures of a suctorian



Natural preservation of corpses of Paramecium aurelia in cultures of a suctorian



Transactions of the American Microscopical Society 95(4): 637-645



Dense, brownish, nonmotile forms of P. aurelia were formed and preserved on 3 separate occasions in cultures in which paramecia were used as food for the suctorian Heliophrya erhardi. Some suctorians were also preserved. Many of these altered cells remained intact for > 6 mo. Transmission and scanning electron microscopy established that these forms were dead ciliates, in which organelles and membranes were preserved in slightly altered forms but in nearly normal anatomic arrangement. The preserved cells contained a few bacteria; soluble materials appeared to have been lost. It is not clear why normal decay processes failed to remove these corpses, but some possibilities are considered. One testable hypothesis postulates that the filamentous actinomyctes seen on the surface of the cultures are similar to organisms known to cause bulking in activated sludge and that they may be retarding decay of the ciliates.

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Accession: 005959319

Download citation: RISBibTeXText

PMID: 1020115

DOI: 10.2307/3225387


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