Polymorphic Crystallization and Transformation of the Anti-Viral/HIV Drug Stavudine
Why this work is in the frame
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Bibliographic record
Abstract
The effect of supersaturation, nucleation temperature, cooling rate and solvent on the polymorphic crystallization of stavudine has been studied. Supersaturation is found to be the predominant controlling factor for the occurrence of polymorphs. When stavudine crystallizes from methanol or 2-propanol, form I nucleates preferentially at a low supersaturation level, whereas form II can be obtained at a high supersaturation level. When 1-butanol is used as solvent, apart from forms I and II, a newly found metastable form IV can crystallize out at a moderate supersaturation level. The relative stability of the above three polymorphs in decreasing order is: I > IV > II. In addition, the polymorphic transformation of stavudine in 2-propanol from form II to form I has been investigated by in situ Raman spectroscopy. The transformation rate is found to be accelerated significantly by increasing temperature and seeding with form I.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it