A Comparison of Ribonucleotide Reductase Activities inNormal Human Fibroblast Strains with Their TransformedCounterparts
Bibliographic record
Abstract
The objective of this investigation was to examine the relationship between levels of ribonucleotide reductase activity and transformation of two human cell strains. Enzyme activity levels were elevated by 3.2- to 3.5-fold in transformed cells compared directly to the normal human fibroblast strains from which they were derived. There did not appear to be a general correlation between elevated ribonucleotide reductase and increased proliferation abilities as has been previously observed with some rodent tumor cell lines. In keeping with the rise in reductase activity, human transformed cells were relatively more resistant to the cytotoxic effects of hydroxyurea, an antitumor agent whose site of action is ribonucleotide reductase. This indicates that an important point to be considered during drug therapy aimed at the reductase, is the greater sensitivity of normal compared to transformed cells due to differences in enzyme activity. The results of this investigation support the view that an increased ability to reduce ribonucleotides is an important step towards the development of a neoplastic program in human cells.
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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 | 0.000 |
| 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) | 0.002 | 0.001 |
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".