Clustering of marine bacteria in seawater enrichments

Article Abstract:

Bacterial motility in the ocean was investigated by examining the movement of bacterial communities in cultures containing a nutrient source. Bacteria formed clusters around the nutrient source, traveling at an average speed of 163 mumeters s(super -1). After reaching the peak, bacteria reversed direction rather than dispersing to different directions. Air-water interfaces had no effect on cell motility, whereas salinity and pH had a significant effect on cell speed. Of the species observed, Shewanella putrefaciens exhibited the highest speed at 100 mumeters s(super -1).

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Natural assemblages of marine bacteria exhibiting high-speed motility and large accelerations

Article Abstract:

Natural communities of marine bacteria have a high speed of motility and acceleration. A comparison of the speed of natural communities of marine bacteria, an isolate, FMB-Bf3 from a single marine community and Escherichia coli indicate that the natural communities have a higher speed. The natural-community bacteria have a considerably higher acceleration in mid- run, between turns and while moving in straight paths. The low and steady speed of bacteria in culture-based studies is inappropriate for marine bacterial communities.

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Long lag times and high velocities in the motility of natural assemblages of marine bacteria

Article Abstract:

Examination of the motility behavior of natural assemblages of coastal marine bacteria indicates that addition of tryptic soy broth leads to a time-dependent increase on the motility of these bacteria, indicating that motility in the marine environment is limited by energy. These bacteria move in high speeds, and quick shifts during speeding enable the bacteria to rapidly identify the positional changes in small, nutrient sources.

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