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The principle of quenching undesirable indirect external trouble in nuclear Overhauser effect spectroscopy (QUIET-NOESY) relies on a doubly selective inversion of the longitudinal magnetization components of a source spin A and a target spin X to measure the cross-relaxation rate (Overhauser effect) between A and X without significant perturbation by spin diffusion. In 15N-enriched proteins, this can be achieved by using a bilinear rotation decoupling (BIRD) sequence for the selective inversion of amide protons that have a scalar coupling to nitrogen-15. The procedure can be improved by using editing techniques to simplify the resulting NOESY spectra. [on SciFinder (R)]
Geoffrey Bodenhausen, Fabien Ferrage