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@INPROCEEDINGS{Arcon:154275,
      author       = {Arcon, Iztok and Vogel-Mikus, Katarina and Kump, Peter},
      title        = {{M}icro-{XANES} analysis of metal accumulation in plants on
                      sub-cellular level},
      reportid     = {DESY-2013-00887},
      year         = {2013},
      abstract     = {There is a growing need to develop powerful analytical
                      tools for monitoring concentrations and chemical state of
                      trace element in the biosphere and its abiotic environment,
                      due to pollution and degradation of ecosystems worldwide.
                      Increased metal concentrations present in the environment
                      pose a threat to all living organisms from microorganisms
                      and plants to animals and humans, because they interfere
                      with vital biological processes. The goal is to efficiently
                      assess metal bioavailability and toxicity, and gain more
                      knowledge on the mechanisms of metal uptake, accumulation
                      and detoxification in living organisms [1]. In this work we
                      demonstrate that a combination of micro-XRF imaging and
                      micro-XANES and EXAFS analysis represents a powerful and
                      indispensable tool for characterization of metal pollutants
                      on subcellular level. The methodological approaches for
                      efficient micro-XAS experiments are presented, the
                      limitations and sources of potential systematic errors in
                      XANES and EXAFS analysis (especially at low energies) due to
                      self-absorption effects and strong energy dependent
                      penetration depth of X-ray beam in the sample are discussed.
                      Some typical examples of such combined micro-spectroscopy
                      analysis are selected from the following research fields:
                      Cd/Zn hyper-accumulating plants, that can be used for
                      phytoremediation of Cd/Zn polluted and degraded ecosystems,
                      including investigation of the role of externally supplied
                      sulphur compounds in the nutrient solution of the Cd/Zn
                      hyperaccumulator Thlaspi praecox, that may alter leaf Cd
                      distribution and Cd ligand environment [2];
                      biofortification, which aims to increase essential elements
                      (Fe) concentrations in the edible plant parts [3]; microbial
                      regulation of metal (Fe, Pd) uptake and formation of
                      Fe-oxide and Pd nanoparticles, encapsulated in
                      exopolysaccharide to avoid iron toxicity under anaerobic
                      conditions, discovered on a strain of Klebsiella oxytoca,
                      isolated from acid pyrite-mine drainage[4].},
      month         = {Sep},
      date          = {2013-09-02},
      organization  = {22nd International Congress on X-ray
                       Optics and Microanalysis, Hamburg
                       (Germany), 2 Sep 2013 - 6 Sep 2013},
      subtyp        = {Plenary/Keynote},
      cin          = {DOOR},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {DORIS Beamline C (POF2-54G13) / DORIS Beamline A1
                      (POF2-54G13) / FS-Proposal: I-20110511 EC (I-20110511-EC) /
                      CALIPSO - Coordinated Access to Lightsources to Promote
                      Standards and Optimization (312284)},
      pid          = {G:(DE-H253)POF2-C-20130405 / G:(DE-H253)POF2-A1-20130405 /
                      G:(DE-H253)I-20110511-EC / G:(EU-Grant)312284},
      experiment   = {EXP:(DE-H253)D-C-20150101 / EXP:(DE-H253)D-A1-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/154275},
}