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000057088 084__ $$2WoS$$aPhysics, Multidisciplinary
000057088 1001_ $$0P:(DE-Juel1)130917$$aRichter, D.$$b0$$uFZJ
000057088 245__ $$aNeutron spin echo for the exploration of large scale macromolecular dynamics
000057088 260__ $$aTokyo$$bThe Physical Society of Japan$$c2006
000057088 300__ $$a111004
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000057088 520__ $$aIn soft materials the structures, the macroscopic mechanical and rheological properties and the phase changes are determined to high degree but thermal motion of the atoms and molecules. Most of the relevant dynamics takes place on mesoscopic lengths and time scales in between the picosecond atomic scale and the macroscopic frame. Offering the proper space time observation window, neutron spin echo (NSE) spectroscopy uniquely addresses these motions. In this short review we briefly present some key experimental results on the mesoscopic dynamics of polymer systems. We address the standard model of polymer motion, the Rouse model, the role of topological confinement as expressed in the reptation model and finally, processes limiting the confinement-we discuss contour length fluctuations of entangled chains. Very recently it became also possible to directly identify large scale internal dynamics of proteins by neutron spin echo. We report the results of these pioneering studies, which most likely will initiate further experiments on the large scale motions of proteins and their relation to the function.
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000057088 65320 $$2Author$$aneutron spin echo
000057088 65320 $$2Author$$amacromolecule dynamics
000057088 65320 $$2Author$$acontour length fluctuations
000057088 65320 $$2Author$$aprotein domain motion
000057088 650_7 $$2WoSType$$aJ
000057088 773__ $$0PERI:(DE-600)2042147-3$$a10.1143/JPSJ.75.111004$$gVol. 75, p. 111004$$p111004$$q75<111004$$tJournal of the Physical Society of Japan$$v75$$x0031-9015$$y2006
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