Initial excited‐state structural dynamics of uridine from resonance Raman spectroscopy
Bibliographic record
Abstract
Abstract The effect of the N1 ribose sugar on the initial excited‐state structural dynamics of uridine is explored with ultraviolet resonance Raman spectroscopy. Excited‐state slopes and broadening parameters were obtained by simulating the resonance Raman excitation profiles and absorption spectrum using a self‐consistent, time‐dependent formalism. The initial excited‐state structural dynamics of uridine look similar to those of uracil, in terms of the distribution of percentage of reorganization energy along different modes, but there is an overall decrease in the excited‐state slopes along most of the modes in uridine compared with uracil. Only about 30% of the total initial reorganization energy in both uracil and uridine are oriented along the photochemically reactive coordinates. The results are also similar to those of thymine and thymidine, upon attachment of the sugar. These differences between thymine, thymidine, uracil and uridine are examined, and the possible effect on the resulting differences in photochemistry is discussed.
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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) | 0.002 | 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".