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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},
}