| Id |
Subject |
Object |
Predicate |
Lexical cue |
| T419 |
0-150 |
Sentence |
denotes |
The earliest pulse sequence used to measure diffusion in NMR spectroscopy is the gradient spin echo sequence (SE), developed by Stejskal et al. [293]. |
| T420 |
151-195 |
Sentence |
denotes |
The SE pulse sequence is shown in Figure 12. |
| T421 |
196-382 |
Sentence |
denotes |
The SE pulse sequence uses a gradient (G) of the externally applied magnetic field, (pulsed field gradient), the first after the 90° pulse, and the other after the 180° refocusing pulse. |
| T422 |
383-514 |
Sentence |
denotes |
The first gradient pulse (G1) labels or gradient-encodes the NMR-active nuclei based on their physical position in the sample tube. |
| T423 |
515-661 |
Sentence |
denotes |
If the molecules diffuse during the time period they are not in the correct position to experience the second gradient which re-focuses the spins. |
| T424 |
662-718 |
Sentence |
denotes |
This is detected via NMR as a signal intensity decrease. |
| T425 |
719-911 |
Sentence |
denotes |
After a diffusion time (∆), the second gradient pulse is applied to decode the spatial labeling of NMR-active nuclei, obtaining a well-defined spectra of diffusing molecules in solution [294]. |
| T426 |
912-1066 |
Sentence |
denotes |
Additional NMR sequences are available for diffusion experiments [295], and are detailed in more comprehensive reviews dealing with the subject [296,297]. |
