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@ARTICLE{Kang:890733,
      author       = {Kang, Kyongok and Sadakane, Koichiro},
      title        = {{L}ong-time oscillations in correlation of lysozyme
                      solutions and the effects of antagonistic salt in external
                      electric field light scattering},
      journal      = {Journal of physics communications},
      volume       = {5},
      number       = {3},
      issn         = {2399-6528},
      address      = {Philadelphia, PA},
      publisher    = {IOP Publishing Ltd.},
      reportid     = {FZJ-2021-01156},
      pages        = {035003},
      year         = {2021},
      abstract     = {Lysozyme is a ubiquitous protein and enzyme that prevents
                      the bacterial infections and maintains the catalytic balance
                      in majority of biological fluids. However, it often causes
                      problems at higher concentrations. In particular, the build
                      up of lysozyme engaged with other protein interactions
                      initiates severe disorders in most mammalian cells, such as
                      the formation of harmful aggregates in the nervous system
                      and the loss of connectivity in rheumatism. To understand
                      such complex behaviors with respective to the catalytic
                      activity of the enzyme, the lysozyme solution and the effect
                      of hydrophobic antagonistic salt (NaBPh4) are explored
                      in-vitro, in their relaxation behaviors. Here, we used, both
                      normal dynamic light scattering and home-built in situ AC
                      external electric field light scattering. As results, the
                      fast and slow-mode (with stretched) relaxations are observed
                      in the conventional dynamic light scattering (without an
                      electric field). The results are particularly noteworthy
                      under a low electric field, with robust long-time
                      oscillations, in the scattered intensity correlation
                      function. In addition, the effective interactions are
                      explored by varying the ionic strength of the antagonistic
                      salt: The oscillations are less pronounced, but still
                      clearly represent the 'underdamped' motions. Overall,
                      reductions of the relaxations are shown with the applied
                      electric field, with a maximum relaxation occuring at 1mM.
                      In contrast, monotonic decreases of the relaxation rates are
                      shown above 10 mM. Thus, the lysozyme exhibits a charged
                      carrier, responding to ultimate low-frequency oscillations
                      in the scattered correlations. The fit function of long-time
                      oscillation in correlation is presented by an alternating
                      cosine function with a phase, which is related to its
                      possible dynamic elelctrophoretic mobility.},
      cin          = {IBI-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {524 - Molecular and Cellular Information Processing
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-524},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000625852000001},
      doi          = {10.1088/2399-6528/abe7f9},
      url          = {https://juser.fz-juelich.de/record/890733},
}