Characterization of molecular motions in biomolecular systems by elastic incoherent neutron scattering.
In the present work the role played by the instrumental resolution function in elastic incoherent neutron scattering (EINS) experiment is discussed. An important result consists in the definition of an equivalent time t(*), which depends both on the characteristic system time and on the resolution time, for which the spatial Fourier transform of EINS intensity profile and the self-distribution function (SDF) evaluated at t=t(*) are proportional. Then the equivalent time t(*) is introduced in the SDF procedure, an operational recipe for the mean square displacement determination. The new revised procedure is applied on data of myoglobin in trehalose dry environment and of hydrated homologous disaccharides (sucrose and trehalose).
Magazù
Salvatore
S
Dipartimento di Fisica, Universita di Messina, P.O. Box 55, I-98166 Messina, Italy. smagazu@unime.it
Maisano
Giacomo
G
Migliardo
Federica
F
Galli
Giovanni
G
Benedetto
Antonio
A
Morineau
Denis
D
Affouard
F
F
Descamps
M
M
D004548:Elasticity; D009068:Movement; D009211:Myoglobin / Q000737:chemistry / Q000378:metabolism; D033363:Neutron Diffraction; D012997:Solvents / Q000737:chemistry; D013395:Sucrose / Q000737:chemistry / Q000378:metabolism; D013696:Temperature; D014199:Trehalose / Q000737:chemistry / Q000378:metabolism; D014867:Water / Q000737:chemistry
D009211:Myoglobin; D012997:Solvents; D014867:Water; D013395:Sucrose; D014199:Trehalose