skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Zooming in on disordered systems: Neutron reflection studies of proteins associated with fluid membranes

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1213598
Grant/Contract Number:
70NANB13H009
Resource Type:
Journal Article: Published Article
Journal Name:
Biochimica et Biophysica Acta. Biomembranes
Additional Journal Information:
Journal Volume: 1838; Journal Issue: 9; Related Information: CHORUS Timestamp: 2017-06-22 06:17:02; Journal ID: ISSN 0005-2736
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Heinrich, Frank, and Lösche, Mathias. Zooming in on disordered systems: Neutron reflection studies of proteins associated with fluid membranes. Netherlands: N. p., 2014. Web. doi:10.1016/j.bbamem.2014.03.007.
Heinrich, Frank, & Lösche, Mathias. Zooming in on disordered systems: Neutron reflection studies of proteins associated with fluid membranes. Netherlands. doi:10.1016/j.bbamem.2014.03.007.
Heinrich, Frank, and Lösche, Mathias. Mon . "Zooming in on disordered systems: Neutron reflection studies of proteins associated with fluid membranes". Netherlands. doi:10.1016/j.bbamem.2014.03.007.
@article{osti_1213598,
title = {Zooming in on disordered systems: Neutron reflection studies of proteins associated with fluid membranes},
author = {Heinrich, Frank and Lösche, Mathias},
abstractNote = {},
doi = {10.1016/j.bbamem.2014.03.007},
journal = {Biochimica et Biophysica Acta. Biomembranes},
number = 9,
volume = 1838,
place = {Netherlands},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.bbamem.2014.03.007

Citation Metrics:
Cited by: 25works
Citation information provided by
Web of Science

Save / Share:
  • Vibrational energy relaxation pathways from optically excited heme proteins are studied by using a transient thermal phase grating technique which monitors the solvent lattice temperature. Vibrational energy transfer from the porphyrin ring to the protein backbone leads to extensive delocalization of the energy in the protein matrix which is efficiently transferred to the water interface in less than 20 ps. A slower relaxation process on the nanosecond time scale is also observed. The slow relaxation component is attributed to slow conformational relaxation processes of high potential energy states of the heme proteins accessed during the high internal energy conditions ofmore » the optically excited molecule.« less
  • By utilizing the symmetric property known as the Ward-Takahashi identity in disordered systems, we explore the novel symmetry relations which hold in one-dimensional systems with inverse square interaction (the Calogero-Sutherland model). The identities emerge totally from the algebraic structure of the model. They show that the dynamical correlators are connected with one another, involving the higher-order integrals of motion. We obtain the result for the coupling strengths {lambda}=1/2, 1, and 2, and conjecture that a similar relation may hold for arbitrary rational {lambda}. {copyright} {ital 1997} {ital The American Physical Society}
  • Compositions, local atomic structures, porosity, and vibrational dynamics of carbons obtained by pyrolyzing epoxy novolak resins at 650 and 1,000 C are investigated using several neutron scattering techniques. The ultimate goal is to understand the origin of the very high capacity for Li uptake exhibited by these materials. Neutron radial distribution function analysis and incoherent inelastic scattering show that the structural motif is a planar hexagonal graphene fragment {approximately}10 {angstrom} on a side, with edge carbons terminated by single hydrogen atoms and random stacking between fragments. Small-angle neutron scattering reveals substantial porosity on a length scale comparable to the sizemore » of the graphene fragments. Coupled with computer simulations, these results are consistent with two proposed mechanisms for unusually high Li capacity, one analogous to conventional intercalation but with Li on both sides of isolated graphene fragments, the other involving bonding of Li to H-terminated edge carbons.« less
  • Inelastic-neutron-scattering studies of cubic zirconia at elevated temperatures (300--1700 K) showed well-defined LA and TA phonons but no optical-phonon branches were observed, confirming earlier reported reduced Raman scattering data. The LA and TA phonons were observed to broaden with a q/sup 2/ dependence. The elastic constants C/sub 11/, C/sub 12/, and C/sub 44/ were derived from the dispersion data at room temperature and at elevated temperatures. The frequency distribution of one phonon density of states was generated from the dispersion relation and was found to be in reasonable agreement with the observed Raman spectrum. Also diffuse-elastic-scattering measurements were taken andmore » showed broad intensity peaks in reciprocal space. The scattering and the phonon linewidths showed little temperature dependence; intrinsic defects and anharmonicity dominate the damping mechanism. The unobserved optical branches were obtained by the best fit to the experimentally determined acoustic branches, based upon a rigid-ion-model calculation. Static deformations of the oxygen sublattice due to oxygen vacancies are mainly responsible for the data observed.« less
  • The generalized-disorder collective-boson mode-softening universality-principle (GDCBMSUP) for collective-boson mode dispersion in disordered systems (liquids, quantum liquids, glasses, powders, disordered magnets, plasmas...), a unified qualitative and semi-qualitative and semi-quantitative descriptive prescription for treating the properties of very differently disordered systems, is directly dependent upon a measurement (or calculation) of the static structure factor S(k) determined from a frequency average of the dynamic structure factor S(k,w), a multiple of the inelastic differential neutron scattering cross section d/sup 2/sigma/dwdOMEGA. The prescription for this principle is given and, because of its universal applicability to disordered systems of any type with any type and/or degreemore » of disorder, the neutron scattering determination of S(k) takes on renewed importance.« less