Characterization of culturability, protistan grazing, and death of enteric bacteria in aquatic ecosystems
Article Abstract:
Fluorescent rhodamine staining was used to characterize the enteric bacterial populations in natural water samples. The results showed that enteric bacteria in aquatic ecosystems are present as culturable and nonculturable cells. Therefore, standard bacteriological methods are unreliable for assessing bacterial death and survival in natural waters. As a consequence, bacterial death should be redefined to mean loss of morphological integrity, or cellular lysis. The results also showed that protozoan predation is the major cause of death of enteric bacteria in aquatic ecosystems.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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Comparison of rates of flagellate bacterivory and bacterial production in a marine coastal system
Article Abstract:
The chanelling of bacterial secondary production toward higher trophic levels by flagellated protozoa is evaluated. Techniques involving the incorporation of fluorescently labeled bacteria and tritiated thymidine were used to calculate protozooplanktonic predation and bacterial production values. While it was found that the bacterial and flagellated protozoan populations were within the ranges of generally accepted values for marine coastal waters, basic changes inthe trophic status of the system was determined in some samples.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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Role of hydrogen peroxide in loss culturability mediated by visible light inEscherichia coli in a freshwater ecosystem
Article Abstract:
The production of cell dormancy is studied. This involves the determination of whether the process is the result of the direct action of light on the cell or if it is a consequence of the effect of the products generated photochemically upon the cells. Water amples were subjected to bacterial counts and statistical analysis. Results indicate that the loss of culturability of Escherechia coli in illuminated systems may be caused by photochemically generated hydrogen peroxide.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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