<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">George, D. K.</style></author><author><style face="normal" font="default" size="100%">Chen, J. Y.</style></author><author><style face="normal" font="default" size="100%">He, Yunfen</style></author><author><style face="normal" font="default" size="100%">Knab, J. R.</style></author><author><style face="normal" font="default" size="100%">Markelz, A. G.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Functional-State Dependence of Picosecond Protein Dynamics</style></title><secondary-title><style face="normal" font="default" size="100%">J. Phys. Chem. B</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year></dates><volume><style face="normal" font="default" size="100%">125</style></volume><pages><style face="normal" font="default" size="100%">11134-11140</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;We examine temperature-dependent picosecond dynamics of two benchmarking proteins lysozyme and cytochrome &lt;em&gt;c&lt;/em&gt; using temperature-dependent terahertz permittivity measurements. We find that a double Arrhenius temperature dependence with activation energies &lt;em&gt;E&lt;/em&gt;&lt;sub&gt;1&lt;/sub&gt; ∼ 0.1 kJ/mol and &lt;em&gt;E&lt;/em&gt;&lt;sub&gt;2&lt;/sub&gt; ∼ 10 kJ/mol fits the folded and ligand-free state response. The higher activation energy is consistent with the so-called protein dynamical transition associated with beta relaxations at the solvent–protein interface. The lower activation energy is consistent with correlated structural motions. When the structure is removed by denaturing, the lower-activation-energy process is no longer present. Additionally, the lower-activation-energy process is diminished with ligand binding but not for changes in the internal oxidation state. We suggest that the lower-energy activation process is associated with collective structural motions that are no longer accessible with denaturing or binding.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">40</style></issue><section><style face="normal" font="default" size="100%">11134</style></section></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Craig, K.</style></author><author><style face="normal" font="default" size="100%">Felix, C. L.</style></author><author><style face="normal" font="default" size="100%">Heyman, J. N.</style></author><author><style face="normal" font="default" size="100%">Markelz, A. G.</style></author><author><style face="normal" font="default" size="100%">Sherwin, M. S.</style></author><author><style face="normal" font="default" size="100%">Campman, K. L.</style></author><author><style face="normal" font="default" size="100%">Hopkins, P. F.</style></author><author><style face="normal" font="default" size="100%">Gossard, A. C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">FAR-INFRARED SATURATION SPECTROSCOPY OF A SINGLE SQUARE-WELL</style></title><secondary-title><style face="normal" font="default" size="100%">Semiconductor Science and Technology</style></secondary-title><short-title><style face="normal" font="default" size="100%">Semicond. Sci. Technol.</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">1994</style></year><pub-dates><date><style  face="normal" font="default" size="100%">May</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">5</style></number><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">627-629</style></pages><isbn><style face="normal" font="default" size="100%">0268-1242</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We have performed saturation spectroscopy measurements of the lowest intersubband transition in a single 400 angstrom GaAs/Al0.3Ga0.7As modulation-doped square quantum well. We couple intense tunable far-infrared radiation from the Santa Barbara free electron laser into our sample using an edge-coupling technique and measure absorption as a function of frequency and intensity. Saturation and frequency shifts in the absorption line are clearly observed. We attribute the frequency shifts to reductions in the many-body depolarization shift. From our preliminary measurements, we estimate the intersubband relaxation time to be 600 ps to within a factor of three.&lt;/p&gt;</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:A1994NM75300061</style></accession-num><notes><style face="normal" font="default" size="100%">Sherwin, Mark S/Q-4762-2017&lt;br/&gt;Sherwin, Mark S/0000-0002-3869-1893; Markelz, Andrea/0000-0003-0443-4319&lt;br/&gt;S&lt;br/&gt;8th International Conference on Hot Carriers in Semiconductors&lt;br/&gt;Aug 16-20, 1993&lt;br/&gt;Oxford univ, oxford, england&lt;br/&gt;Sci &amp; engn res council; royal soc; brit council; oxford univ&lt;br/&gt;31</style></notes></record></records></xml>