Anomalous supercooled liquid structure of Ga on β-relaxation dynamics

1997 ◽  
Vol 56 (4) ◽  
pp. 4381-4385 ◽  
Author(s):  
H. C. Chen ◽  
S. K. Lai
Keyword(s):  
Supercooled Liquid ◽  
Liquid Structure ◽  
Relaxation Dynamics ◽  
Β Relaxation

scholarly journals α and β relaxation dynamics of a fragile plastic crystal

2006 ◽  
Vol 124 (12) ◽  
pp. 124911 ◽  
Author(s):  
L. C. Pardo ◽  
P. Lunkenheimer ◽  
A. Loidl
Keyword(s):  
Plastic Crystal ◽  
Relaxation Dynamics ◽  
Β Relaxation

scholarly journals Effects of pressure on the dynamics of an oligomeric protein from deep-sea hyperthermophile

2015 ◽  
Vol 112 (45) ◽  
pp. 13886-13891 ◽  
Author(s):  
Utsab R. Shrestha ◽  
Debsindhu Bhowmik ◽  
John R. D. Copley ◽  
Madhusudan Tyagi ◽  
Juscelino B. Leão ◽  
...  
Keyword(s):  
Hydrothermal Vents ◽  
Ambient Pressure ◽  
Inorganic Pyrophosphatase ◽  
Relaxation Dynamics ◽  
Egg White Lysozyme ◽  
Protein Energy ◽  
Oligomeric Protein ◽  
Model Protein ◽  
Quasielastic Neutron ◽  
Β Relaxation

Inorganic pyrophosphatase (IPPase) from Thermococcus thioreducens is a large oligomeric protein derived from a hyperthermophilic microorganism that is found near hydrothermal vents deep under the sea, where the pressure is up to 100 MPa (1 kbar). It has attracted great interest in biophysical research because of its high activity under extreme conditions in the seabed. In this study, we use the quasielastic neutron scattering (QENS) technique to investigate the effects of pressure on the conformational flexibility and relaxation dynamics of IPPase over a wide temperature range. The β-relaxation dynamics of proteins was studied in the time ranges from 2 to 25 ps, and from 100 ps to 2 ns, using two spectrometers. Our results indicate that, under a pressure of 100 MPa, close to that of the native environment deep under the sea, IPPase displays much faster relaxation dynamics than a mesophilic model protein, hen egg white lysozyme (HEWL), at all measured temperatures, opposite to what we observed previously under ambient pressure. This contradictory observation provides evidence that the protein energy landscape is distorted by high pressure, which is significantly different for hyperthermophilic (IPPase) and mesophilic (HEWL) proteins. We further derive from our observations a schematic denaturation phase diagram together with energy landscapes for the two very different proteins, which can be used as a general picture to understand the dynamical properties of thermophilic proteins under pressure.

scholarly journals The Relaxation Dynamics of a Supercooled Liquid Confined by Rough Walls†

2004 ◽  
Vol 108 (21) ◽  
pp. 6673-6686 ◽  
Author(s):  
Peter Scheidler ◽  
Walter Kob ◽  
Kurt Binder
Keyword(s):  
Supercooled Liquid ◽  
Relaxation Dynamics ◽  
Rough Walls

scholarly journals Interplay of α/β-Relaxation Dynamics and the Shape of Ionomer Building Blocks

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Bruno R. Matos ◽  
Rodolfo Politano ◽  
José Fernando Q. Rey ◽  
Daniel Hermida-Merino ◽  
Ulrich Schade ◽  
...  
Keyword(s):  
Building Blocks ◽  
Relaxation Dynamics ◽  
Β Relaxation
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