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000009701 0247_ $$2DOI$$a10.1016/j.watres.2010.01.017
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000009701 084__ $$2WoS$$aEngineering, Environmental
000009701 084__ $$2WoS$$aEnvironmental Sciences
000009701 084__ $$2WoS$$aWater Resources
000009701 1001_ $$0P:(DE-Juel1)VDB40365$$aJansen, S.$$b0$$uFZJ
000009701 245__ $$aOn the role of metabolic activity on the transport and deposition of Pseudomonas fluorescens in saturated porous media
000009701 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2010
000009701 300__ $$a1288 - 1296
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000009701 440_0 $$022261$$aWater Research$$v44$$x0043-1354$$y4
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000009701 520__ $$aA study was conducted to understand the role of cell concentration and metabolic state in the transport and deposition behaviour of Pseudomonas fluorescens with and without substrate addition. Column experiments using the short-pulse technique (pulse was equivalent to 0.028 pore volume) were performed in quartz sand operating under saturated conditions. For comparison, experiments with microspheres and inactive (killed) bacteria were also conducted. The effluent concentrations, the retained particle concentrations and the cell shape were determined by fluorescent microscopy. For the transport of metabolically-active P. fluorescens without substrate addition a bimodal breakthrough curve was observed, which could be explained by the different breakthrough behaviour of the rod-shaped and coccoidal cells of P. fluorescens. The 70:30 rod/coccoid ratio in the influent drastically changed during the transport and it was about 20:80 in the effluent and in the quartz sand packing. It was assumed that the active rod-shaped cells were subjected to shrinkage into coccoidal cells. The change from active rod-shaped cells to coccoidal cells could be explained by oxygen deficiency which occurs in column experiments under saturated conditions. Also the substrate addition led to two consecutive breakthrough peaks and to more bacteria being retained in the column. In general, the presence of substrate made the assumed stress effects more pronounced. In comparison to microspheres and inactive (killed) bacteria, the transport of metabolically-active bacteria with and without substrate addition is affected by differences in physiological state between rod-shaped and the formed stress-resistant coccoidal cells of P. fluorescens.
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000009701 588__ $$aDataset connected to Web of Science, Pubmed
000009701 650_2 $$2MeSH$$aFiltration
000009701 650_2 $$2MeSH$$aFresh Water: microbiology
000009701 650_2 $$2MeSH$$aPorosity
000009701 650_2 $$2MeSH$$aPseudomonas fluorescens: chemistry
000009701 650_2 $$2MeSH$$aPseudomonas fluorescens: growth & development
000009701 650_2 $$2MeSH$$aPseudomonas fluorescens: metabolism
000009701 650_2 $$2MeSH$$aSilicon Dioxide: chemistry
000009701 650_2 $$2MeSH$$aWater Pollutants: analysis
000009701 650_2 $$2MeSH$$aWater Pollutants: chemistry
000009701 650_7 $$00$$2NLM Chemicals$$aWater Pollutants
000009701 650_7 $$07631-86-9$$2NLM Chemicals$$aSilicon Dioxide
000009701 650_7 $$2WoSType$$aJ
000009701 65320 $$2Author$$aBacteria transport
000009701 65320 $$2Author$$aColloid deposition
000009701 65320 $$2Author$$aCell morphology
000009701 65320 $$2Author$$aPhysiological state
000009701 65320 $$2Author$$aPseudomonas fluorescens
000009701 65320 $$2Author$$aOxygen stress
000009701 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b1$$uFZJ
000009701 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, E.$$b2$$uFZJ
000009701 773__ $$0PERI:(DE-600)1501098-3$$a10.1016/j.watres.2010.01.017$$gVol. 44, p. 1288 - 1296$$p1288 - 1296$$q44<1288 - 1296$$tWater research$$v44$$x0043-1354$$y2010
000009701 8567_ $$uhttp://dx.doi.org/10.1016/j.watres.2010.01.017
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