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@ARTICLE{Gargiulo:57171,
      author       = {Gargiulo, G. and Bradford, S. and Simunek, J. and Ustohal,
                      P. and Vereecken, H. and Klumpp, E.},
      title        = {{B}acteria transport and deposition under unsaturated
                      conditions: the role of the matrix grain size and the
                      bacteria surface protein},
      journal      = {Journal of contaminant hydrology},
      volume       = {92},
      issn         = {0169-7722},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-57171},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Unsaturated $(80\%$ water saturated) packed column
                      experiments were conducted to investigate the influence of
                      grain size distribution and bacteria surface macromolecules
                      on bacteria (Rhodococcus rhodochrous) transport and
                      deposition mechanisms. Three sizes of silica sands were used
                      in these transport experiments, and their median grain sizes
                      were 607, 567, and 330 microm. The amount of retained
                      bacteria increased with decreasing sand size, and most of
                      the deposited bacteria were found adjacent to the column
                      inlet. The deposition profiles were not consistent with
                      predictions based on classical filtration theory. The
                      experimental data could be accurately characterized using a
                      mathematical model that accounted for first-order
                      attachment, detachment, and time and depth-dependent
                      straining processes. Visual observations of the bacteria
                      deposition as well as mathematical modelling indicated that
                      straining was the dominant mechanism of deposition in these
                      sands $(78-99.6\%$ of the deposited bacteria), which may
                      have been enhanced due to the tendency of this bacterium to
                      form aggregates. An additional unsaturated experiment was
                      conducted to better deduce the role of bacteria surface
                      macromolecules on attachment and straining processes. In
                      this case, the bacteria surface was treated using a
                      proteolitic enzyme. This technique was assessed by examining
                      the Fourier-transform infrared spectrum and hydrophobicity
                      of untreated and enzyme treated cells. Both of these
                      analytical procedures demonstrated that this enzymatic
                      treatment removed the surface proteins and/or associated
                      macromolecules. Transport and modelling studies conducted
                      with the enzyme treated bacteria, revealed a decrease in
                      attachment, but that straining was not significantly
                      affected by this treatment.},
      keywords     = {Bacteria: chemistry / Bacteria: metabolism / Bacterial
                      Adhesion / Bacterial Proteins: chemistry / Bacterial
                      Proteins: metabolism / Membrane Proteins: chemistry /
                      Membrane Proteins: metabolism / Particle Size / Porosity /
                      Silicon Dioxide: chemistry / Surface Properties / Bacterial
                      Proteins (NLM Chemicals) / Membrane Proteins (NLM Chemicals)
                      / Silicon Dioxide (NLM Chemicals) / J (WoSType)},
      cin          = {ICG-4 / JARA-ENERGY / JARA-SIM},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$ /
                      I:(DE-Juel1)VDB1045},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Geosciences, Multidisciplinary /
                      Water Resources},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:17337313},
      UT           = {WOS:000248292400006},
      doi          = {10.1016/j.jconhyd.2007.01.009},
      url          = {https://juser.fz-juelich.de/record/57171},
}