By Wang Q.H., Zhu L.X.
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Extra resources for A Berry-Essen Inequality for the Kaplan-Meier L-Estimator
In this connection, Schaefer et al. 84 examined 13C T1r data of glassy polymers in terms of distinct main- and side-chain motions in the 10–50 kHz regime. 7. Top, Pulse sequence of T1H determination via 13C CP-MAS method. DECOUPL, decoupling; SL, spin lock. Bottom, Behavior of spins during the sequence (from Sullivan and Maciel83). less than the local dipolar field. 85 In contrast, 13C resolved, 1H T1r values can to interpret the 13C T1r be conveniently utilized as a probe to detect such above-mentioned slow motions because of experimental simplicity, although there exists no distinction about the relaxation times among protons because of rapid spin diffusion process.
Conformation-dependent 13 C chemical shifts for polypeptides In the crystalline state, the structural information obtained from the chemical shift corresponds to the fixed conformation of polymer chains. 2). As an Brief Outline of NMR Parameters 35 illustrative example, 13C chemical shifts of Ala residue in polypeptide and proteins were calculated for a dipeptide fragment (N-acetyl-N’-methyl-lalanine amide) [Ac-l-Ala-NHMe] as a model using the finite perturbation theory (FPT) INDO method,51,52 in order to understand and predict the conformation-dependent 13C chemical shift behavior, associated with the secondary structure elements such as an a-helix, b-sheet, etc.
The net signal after N scans is proportional to Mnet (t) ¼ N ½Mz1 (t) À Mz2 (t) À Á ¼ 2NMCP (0) exp Àt=T1C , (3:11) if the signal derived from the second sequence (Eq. 10)) is subtracted from that derived from the first (Eq. 9)) after N scans. A semilog plot of Mnet (t) vs t yields the T1C value from its gradient À1=2:303T1C . 5 exhibits such a stacked plot of Mnet(t) of (1 ! 6) lyophilized from DMSO solution against the delay time t. 1, together with those of annealed sample at 1508C taking the triple helix conformation.