@article{RevereyGanzertLischeidetal.2018,
  author    = {Reverey, Florian and Ganzert, Lars and Lischeid, Gunnar and Ulrich, Andreas and Premke, Katrin and Grossart, Hans-Peter},
  title     = {Dry-wet cycles of kettle hole sediments leave a microbial and biogeochemical legacy},
  series = {The science of the total environment : an international journal for scientific research into the environment and its relationship with man},
  volume    = {627},
  journal   = {The science of the total environment : an international journal for scientific research into the environment and its relationship with man},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0048-9697},
  doi       = {10.1016/j.scitotenv.2018.01.220},
  pages     = {985 -- 996},
  year      = {2018},
  abstract  = {Understanding interrelations between an environment's hydrological past and its current biogeochemistry is necessary for the assessment of biogeochemical and microbial responses to changing hydrological conditions. The question how previous dry-wet events determine the contemporary microbial and biogeochemical state is addressed in this study. Therefore, sediments exposed to the atmosphere of areas with a different hydrological past within one kettle hole, i.e. (1) the predominantly inundated pond center, (2) the pond margin frequently desiccated for longer periods and (3) an intermediate zone, were incubated with the same rewetting treatment. Physicochemical and textural characteristics were related to structural microbial parameters regarding carbon and nitrogen turnover, i.e. abundance of bacteria and fungi, denitrifiers (targeted by the nirK und nirS functional genes) and nitrate ammonifiers (targeted by the nrfA functional gene). Our study reveals that, in combination with varying sediment texture, the hydrological history creates distinct microbial habitats with defined boundary conditions within the kettle hole, mainly driven by redox conditions, pH and organic matter (OM) composition. OM mineralization, as indicated by CO2-outgassing, was most efficient in exposed sediments with a less stable hydrological past. The potential for nitrogen retention via nitrate ammonification was highest in the hydrologically rather stable pond center, counteracting nitrogen loss due to denitrification. Therefore, the degree of hydrological stability is an important factor leaving a microbial and biogeochemical legacy, which determines carbon and nitrogen losses from small lentic freshwater systems in the long term run.},
  language  = {en}
}
@article{HundertmarkPopovaRauschetal.2012,
  author    = {Hundertmark, Michaela and Popova, Antoaneta V. and Rausch, Saskia and Seckler, Robert and Hincha, Dirk K.},
  title     = {Influence of drying on the secondary structure of intrinsically disordered and globular proteins},
  series = {Biochemical and biophysical research communications},
  volume    = {417},
  journal   = {Biochemical and biophysical research communications},
  number    = {1},
  publisher = {Elsevier},
  address   = {San Diego},
  issn      = {0006-291X},
  doi       = {10.1016/j.bbrc.2011.11.067},
  pages     = {122 -- 128},
  year      = {2012},
  abstract  = {Circular dichroism (CD) spectroscopy of five Arabidopsis late embryogenesis abundant (LEA) proteins constituting the plant specific families LEA_5 and LEA_6 showed that they are intrinsically disordered in solution and partially fold during drying. Structural predictions were comparable to these results for hydrated LEA_6, but not for LEA_5 proteins. FTIR spectroscopy showed that verbascose, but not sucrose, strongly affected the structure of the dry proteins. The four investigated globular proteins were only mildly affected by drying in the absence, but strongly in the presence of sugars. These data highlight the larger structural flexibility of disordered compared to globular proteins and the impact of sugars on the structure of both disordered and globular proteins during drying.},
  language  = {en}
}
@article{PopovaHundertmarkSeckleretal.2011,
  author    = {Popova, Antoaneta V. and Hundertmark, Michaela and Seckler, Robert and Hincha, Dirk K.},
  title     = {Structural transitions in the intrinsically disordered plant dehydration stress protein LEA7 upon drying are modulated by the presence of membranes},
  series = {Biochimica et biophysica acta : Biomembranes},
  volume    = {1808},
  journal   = {Biochimica et biophysica acta : Biomembranes},
  number    = {7},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0005-2736},
  doi       = {10.1016/j.bbamem.2011.03.009},
  pages     = {1879 -- 1887},
  year      = {2011},
  abstract  = {Dehydration stress-related late embryogenesis abundant (LEA) proteins have been found in plants, invertebrates and bacteria. Most LEA proteins are unstructured in solution, but some fold into amphipathic a-helices during drying. The Pfam LEA_4 (Group 3) protein LEA7 from the higher plant Arabidopsis thaliana was predicted to be 87\% alpha-helical, while CD spectroscopy showed it to be largely unstructured in solution and only 35\% alpha-helical in the dry state. However, the dry protein contained 15\% beta-sheets. FTIR spectroscopy revealed the (beta-sheets to be largely due to aggregation. beta-Sheet content was reduced and alpha-helix content increased when LEA7 was dried in the presence of liposomes with secondary structure apparently influenced by lipid composition. Secondary structure was also affected by the presence of membranes in the fully hydrated state. A temperature-induced increase in the flexibility of the dry protein was also only observed in the presence of membranes. Functional interactions of LEA7 with membranes in the dry state were indicated by its influence on the thermotropic phase transitions of the lipids and interactions with the lipid headgroup phosphates.},
  language  = {en}
}