Characterization of Ribonucleotide Reductase Activity fromMouse L Cells
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Bibliographic record
Abstract
We describe some fundamental properties of the cytidine 5'-diphosphate (CDP) and guanosine 5'-diphosphate (GDP) reductase activity from mouse L cells. Both activities increased in a nonlinear fashion at low protein concentrations; this may be due to dissociation of two protein subunits of the enzyme at very low concentrations. CDP reductase activity was greatly stimulated in the presence of ATP and required magnesium and iron for maximum activity. GDP reductase required 2'-deoxythymidine 5'-triphosphate for maximum activity. Also apparent Km values of 0.14 mmol/l for CDP and 0.05 mmol/l for GDP were determined from double reciprocal plots of velocity against substrate concentrations. Activity in extracts of logarithmically growing mouse L cells was very high indicating that attempts to purify the enzyme from this source should be rewarding.
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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 | 0.000 | 0.000 |
| 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 it