PMC:2728246 / 39282-40265 JSONTXT

{"project":"2_test","denotations":[{"id":"19652920-16939274-56190989","span":{"begin":325,"end":329},"obj":"16939274"}],"text":"A second set of order parameters, , comes from solid-state NMR measurements of the dynamic averaging of the CxH dipolar couplings, adjacent to a CxCmet bond, using separated local field (SLF) methodologies on ubiquitin in microcrystalline form undergoing magic-angle spinning near ambient temperatures (Lorieau and McDermott 2006). It is reasonable to expect that the adjacent CxH and CxCmet bonds would have similar mobility, assuming that concerted motions are not dominant. Despite the important difference in the sample configuration, the averaging of the dipolar couplings in solids or of the residual dipolar couplings in solution is susceptible to motions including the supra-τc (faster than μs for SLF, faster than ms for RDCs). The SLF generalized order parameters reported as |S| = |\u003cP2(cosθ)\u003e| represents the coefficient of reduction of the corresponding static CH dipolar coupling. For comparison with our order parameters, these coefficient were squared, giving |S|2 = ."}