Magic angle spinning and static oriented sample NMR studies of the relaxation in the rotating frame of membrane peptides
Bibliographic record
Abstract
To demonstrate the influence of motions with medium-to-slow correlation times (milliseconds to nanoseconds), a systematic study of the spin-lattice relaxation in the rotating frame was conducted for several nuclei (H1, C13, and N15) in small membrane polypeptides, either in oriented or magic angle spinning samples. This study not only assesses the validity of some motional models, but also characterizes the magnetization relaxation rates crucial for the design of polarization transfer experiments. It was found that relaxation time constant (T1ρ) values on the order of 10−3–10−2s for backbone nuclei and their dependence on sample orientation are consistent with the model of transmembrane polypeptides undergoing axial diffusion (τc∼10−8–10−7s) and small amplitude off-axis reorientation (τc∼10−6–10−5s).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".