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Report No.

Neutron fiber diffraction measurements of muscle using the contrast variation technique

Fujiwara, Satoru; Takezawa, Yasunori*; Sugimoto, Yasunobu*; Wakabayashi, Katsuzo*

In neutron scattering and diffraction, information on internal fluctuations or a variation of scattering length density of molecules of interest can be extracted by the contrast variation technique. This contrast variation technique was applied to measurements of neutron fiber diffraction of muscles. The neutron fiber diffraction patterns of frog sartorius muscles were measured in the relaxed state and the rigor state, in various D2O concentrations. It was shown that there were variations in the scattering length density distribution in the unit cell of the muscle structure. Analysis of the equatorial reflections showed that the phase information of these reflections is obtained, that the density projected onto a plane perpendicular to the fiber axis of muscle is different between the thick filament region and the thin filament region, and that the projected density of the thick filament changes as the state of muscle changes from the relaxed state to the rigor state.



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