Survival of <Emphasis Type="Italic">Enterococcus faecalis</Emphasis> in Seawater Microcosms Is Limited in the Presence of Bacterivorous Zooflagellates |
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Authors: | A Hartke S Lemarinier V Pichereau Y Auffray |
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Institution: | (1) Laboratoire de Microbiologie de l'Environnement, Université de Caen, F-14032 CAEN Cedex, France, FR |
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Abstract: | The survival and persistence of growing and starved cells of Enterococcus faecalis in untreated and differentially filtered (20 μm, 5 μm, 3 μm, 1.2 μm, and 0.1 μm) seawater was analyzed in samples taken at
different times over a 1-year period by plate counts and scanning electron microscopy. Whereas seawater filtered through a
0.1-μm mesh was not at all or only slightly bactericidal during incubation at 16°C in the dark, culturability of E. faecalis in the other systems decreased as a function of increasing pore size of the filters. Recovery of culturable, glucose pre-starved
cells was always higher than that of cells harvested from the exponential growth phase. Electron microscopic analysis showed
that the disappearance of enterococci appeared related to the presence and multiplication of various zooflagellates.
Received: 25 July 2001 / Accepted: 27 August 2001 |
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