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| Titel: |
Effect of gravity on bacterial deposition and orientation in laminar flow environments |
| Auteur: |
Korber, Darren R. Lawrence, John R. Zhang, Lu Caldwell, Douglas E. |
| Verschenen in: |
Biofouling |
| Paginering: | Jaargang 2 (1990) nr. 4 pagina's 335-350 |
| Jaar: |
1990-11 |
| Inhoud: |
The effect of gravity on the deposition of wild-type and flagellar mutants of Pseudomonas fluorescens and Vibrio parahaemolyticus was evaluated using computer image analysis. Rates of bacterial accumulation were determined for both the upper and lower surfaces of a glass flow cell with well-defined laminar flow conditions. Wild-type organisms deposited on upper and lower surfaces independent of gravity, whereas flagellar mutants deposited on lower surfaces at 10 to 40 times the rate of deposition to upper surfaces. The same gravitational effect was observed for marine communities, where 30% more marine bacteria were observed to deposit on lower surfaces than to upper surfaces, and also in recolonisation studies using motile and nonmotile Pseudomonas fluorescens. These results are in contrast with earlier arguments that bacterial mass, density, and sedimentation are insignificant within flowing microenvironments. These results also showed that motility due to both polar (Pseudomonas sp.) and lateral flagella ( Vibrio sp.) can be important in overcoming gravitational forces during cell deposition processes. Computer image analysis was also used to evaluate the orientation of the longest axis of the cells with the direction of flow. The longitudinal axis of most attached cells was aligned parallel to flow lamina. Alignment was observed in all strains studied, but was greatest for nonmotile P. fluorescens mutants. Gravity had no effect on the degree of alignment for either the wild-type or mutant strains. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 7 gevonden artikelen
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