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Updated: May 24, 2025

Magnetic Tweezers for the Measurement of Twist and Torque
Published on: May 19, 2014
Full determination of chemical shift tensor in magnetically oriented microcrystals with modulated rotation and
Ryosuke Kusumi1, Hayate Yasui2, Hiroshi Kadoma2
1Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan; Department of Forest Resource Chemistry, Forestry and Forest Products Research Institute, Forest Research and Management Organization, Tsukuba 305-8687, Japan.
Abstract:
Complete characterization of 13C chemical shift tensor in magnetically oriented microcrystal suspension (MOMS) is demonstrated with an inhouse 1H-13C double resonance probe capable of rotating microcrystals and of tilting the sample temporarily during the period of NMR signal acquisition. The 13C chemical shift tensor in three-dimensional MOMS of l-alanine is determined from 13C rotation patterns around a tilted axis. The present results prove that even for micrometer-sized microcrystals the chemical shift tensor can be fully determined like in the case of a single piece of bulky crystal but without elaborate sample mounting. Two-dimensional experiments correlating chemical shifts for different sample orientations are also demonstrated.
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