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Old 08-12-2010, 10:56 AM   #1
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Default Hitchhiking Bacteria Can Go Against the Flow

Hitchhiking Bacteria Can Go Against the Flow
ScienceDaily
Aug. 10, 2010
Hitchhiking bacteria can go against the flow
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To test their hypothesis that bacteria might be moving between water masses by hitching a ride on "water fleas" like Daphnia, the researchers filled a series of graduated cylinders with fresh- and then salt-water to form a stably stratified water column, then added bacteria labeled with a green fluorescent protein to the lower layer and kept the top layer bacteria-free.

The researchers then added Daphnia to the cylinders and used a directed light source to manipulate their swimming direction. (The species of Daphnia they used instinctively move toward light.) By alternating the position of the light every 2 hours for 8 hours, the researchers were able to make the water flea swim up and down across the stratified water column several times, and followed the rate at which bacteria were transported upward. A cylinder with bacteria but without Daphnia served as the control. Afterward...
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