TY  - JOUR
AU  - Jaksch, Sebastian
AU  - Koutsioubas, Alexandros
AU  - Mattauch, Stefan
AU  - Holderer, Olaf
AU  - Frielinghaus, Henrich
TI  - Long-Range Excitations in Phospholipid Membranes
JO  - Chemistry and physics of lipids
VL  - 225
SN  - 0009-3084
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2019-03807
SP  - 104788
PY  - 2019
AB  - We investigated the existence of long-range excitations and correlated structures in phospholipid membranes by means of grazing-incidence neutron spin echo spectroscopy, grazing-incidence small-angle neutron scattering, and corresponding theoretical calculations inspired by smectic-membrane theory. All these methods confirmed the existence of thermal excitations in the plane of the surface of the phospholipid membranes or the corresponding structures, respectively. Also, these measurements revealed a temperature dependence of these excitations. These excitations are associated with 100 nm in-plane correlations around physiological temperatures and of 75 nm at 16∘C. A single excitation has an energy around the μeV-regime. A temperature series revealed a high abundance at physiological temperatures and pronounced long-range in-plane structures, which are strongly suppressed at temperatures below 20∘C. From the length-scales and energy transfers involved we surmise that these excitations may play a role in several functions of the cell membranes such as stability and energy dissipation along the membrane. From a fundamental point of view, the observed behavior of those excitations is congruent with that of a quasi-particle (surface mode phonon, smomon) that exists in the plane of phospholipid membranes.
LB  - PUB:(DE-HGF)16
C6  - pmid:31310735
UR  - <Go to ISI:>//WOS:000498339400002
DO  - DOI:10.1016/j.chemphyslip.2019.104788
UR  - https://juser.fz-juelich.de/record/863827
ER  -