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@ARTICLE{Timmermann:587504,
      author       = {Timmermann, Sonja and Anthuparambil, Nimmi Das and Girelli,
                      Anita and Begam, Nafisa and Kowalski, Marvin and Retzbach,
                      Sebastian and Senft, Maximilian Darius and Akhundzadeh,
                      Mohammad Sayed and Poggemann, Hanna-Friederike and Moron,
                      Marc and Hiremath, Anusha and Gutmüller, Dennis and
                      Dargasz, Michelle and Öztuerk, Özguel and Paulus, Michael
                      and Westermeier, Fabian and Sprung, Michael and Ragulskaya,
                      Anastasia and Zhang, Fajun and Schreiber, Frank and Gutt,
                      Christian},
      title        = {{X}-ray driven and intrinsic dynamics in protein gels},
      journal      = {Scientific reports},
      volume       = {13},
      number       = {1},
      issn         = {2045-2322},
      address      = {[London]},
      publisher    = {Macmillan Publishers Limited, part of Springer Nature},
      reportid     = {PUBDB-2023-04342},
      pages        = {11048},
      year         = {2023},
      abstract     = {We use X-ray photon correlation spectroscopy to investigate
                      how structure and dynamics of egg white protein gels are
                      affected by X-ray dose and dose rate. We find that both,
                      changes in structure and beam-induced dynamics, depend on
                      the viscoelastic properties of the gels with soft gels
                      prepared at low temperatures being more sensitive to
                      beam-induced effects. Soft gels can be fluidized by X-ray
                      doses of a few kGy with a crossover from stress relaxation
                      dynamics (Kohlrausch-Williams-Watts exponents $k \approx
                      1.5-2$) to typical dynamical heterogeneous behavior ($k<$1)
                      while the high temperature egg white gels are
                      radiation-stable up to doses of 15 kGy with $k\geq 1.5 $.
                      For all gel samples we observe a crossover from equilibrium
                      dynamics to beam induced motion upon increasing X-ray
                      fluence and determine the resulting fluence threshold values
                      $\Phi_D$. Surprisingly small threshold values of $\Phi_D=(3
                      \pm 2)\times10^{-3} \:\mathrm{ph\:s^{-1}\:nm^{-2}} $ can
                      drive the dynamics in the soft gels while for stronger gels
                      this threshold is increased to $\Phi_D=(0.9 \pm 0.3)
                      \:\mathrm{ph\:s^{-1}\:nm^{-2}}$. We explain our observations
                      with the viscoelastic properties of the materials and can
                      connect the threshold dose for structural beam damage with
                      the dynamic properties of beam-induced motion. Our results
                      suggest that soft viscoelastic materials can display
                      pronounced X-ray driven motion even for low X-ray fluences.
                      This induced motion is not detectable by static scattering
                      as it appears at dose values well below the static damage
                      threshold. We show that intrinsic sample dynamics can be
                      separated from X-ray driven motion by measuring the fluence
                      dependence of the dynamical properties.},
      cin          = {DOOR ; HAS-User / FS-PET-S},
      ddc          = {600},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {633 - Life Sciences – Building Blocks of Life: Structure
                      and Function (POF4-633) / 6G3 - PETRA III (DESY) (POF4-6G3)
                      / FS-Proposal: II-20210008 (II-20210008) / FS-Proposal:
                      I-20211600 (I-20211600) / FS-Proposal: I-20210097
                      (I-20210097) / 05K19PS1 - Instrumentierung, um die Dynamik
                      von biologischen Proben mit Korrelationsspektroskopie zu
                      messen. (BMBF-05K19PS1) / 05K20PSA - Verbundprojekt 05K2020
                      - 2019-06075 Protein-Dyn: Dynamik von Proteinen in Lösungen
                      auf multiplen Längen und Zeitskalen (Teilprojekt 1)
                      (BMBF-05K20PSA) / 05K22PS1 - Schnelle
                      Korrelationsspektroskopie an der ESRF-EBS (BMBF-05K22PS1) /
                      DFG project 390677874 - EXC 2033: RESOLV (Ruhr Explores
                      Solvation) (390677874)},
      pid          = {G:(DE-HGF)POF4-633 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)II-20210008 / G:(DE-H253)I-20211600 /
                      G:(DE-H253)I-20210097 / G:(DE-Ds200)BMBF-05K19PS1 /
                      G:(DE-Ds200)BMBF-05K20PSA / G:(DE-Ds200)BMBF-05K22PS1 /
                      G:(GEPRIS)390677874},
      experiment   = {EXP:(DE-H253)P-P10-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {37422480},
      UT           = {WOS:001026178300017},
      doi          = {10.1038/s41598-023-38059-z},
      url          = {https://bib-pubdb1.desy.de/record/587504},
}