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@ARTICLE{Krause:866555,
      author       = {Krause, Lars and Biesgen, Danh and Treder, Aaron and
                      Schweizer, Steffen A. and Klumpp, Erwin and Knief, Claudia
                      and Siebers, Nina},
      title        = {{I}nitial microaggregate formation: {A}ssociation of
                      microorganisms to montmorillonite-goethite aggregates under
                      wetting and drying cycles},
      journal      = {Geoderma},
      volume       = {351},
      issn         = {0016-7061},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2019-05645},
      pages        = {250 - 260},
      year         = {2019},
      abstract     = {There is an intimate relationship between microorganisms
                      and the formation and stability of soil microaggregates,
                      realized by the immobilization and occlusion of
                      microorganisms. Little is known about the initial aggregate
                      formation phase and the role of microorganisms in this
                      process under the impact of environmental changes such as
                      wetting and drying. We investigated this initial aggregate
                      formation process of montmorillonite and goethite in
                      combination with two bacterial strains, Pseudomonas
                      protegens strain CHA0 and Gordonia alkanivorans strain MoAcy
                      2, in the presence or absence of stress conditions in form
                      of wetting and drying cycles for up to eight days.
                      Montmorillonite and goethite formed microaggregates
                      instantaneously, the size of these aggregates being enhanced
                      in the presence of microorganisms, resulting in up to
                      twofold larger aggregates. This increase in aggregate size
                      was strain-dependent. However, the aggregates that developed
                      during the first 48 h broke into smaller structures later
                      on. A microscopic analysis of the microaggregates revealed
                      that notably the larger microaggregates harbored bacteria
                      and that microaggregates had a sheltering effect on living
                      cells, especially when exposed to desiccation stress.
                      Additionally, aggregate formation was analyzed in the
                      presence of a Pseudomonas protegens mutant strain (CHA211)
                      with increased production capability of extracellular
                      polymeric substances (EPS). About fivefold higher survival
                      rates of culturable cells were observed after desiccation
                      for this EPS overproducing mutant strain in comparison to
                      the wild-type. Our results hint at an aggregate formation
                      process characterized by a rapid occlusion of mineral
                      compounds, and, after the addition of microorganisms, the
                      bacterial colonization of small microaggregates, leading to
                      an increase in aggregate size. The further development of
                      the aggregate size distribution varied depending on the
                      presence of microbial taxa and was modulated by
                      environmental conditions like desiccation events.},
      cin          = {IBG-3},
      ddc          = {910},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000474495700024},
      doi          = {10.1016/j.geoderma.2019.05.001},
      url          = {https://juser.fz-juelich.de/record/866555},
}