Inhibition by Calcium of the Cyclic AMP-Mediated Stimulation of Thymic Lymphoblast Proliferation by Prostaglandin E<sub>1</sub>
Bibliographic record
Abstract
During the first 10 min after exposure of rat thymic lymphocytes (thymocytes) to a high concentration (5.0 µg/ml) of prostaglandin E 1 (PGE 1 ) in medium without added calcium, there is a 67-fold rise in the cellular cyclic AMP content which causes strong stimulations of deoxyribunucleic acid (DNA) synthesis and cell proliferation. On the other hand, in the presence of 1.0 mM calcium, PGE 1 causes a similar (68-fold) rise in the cellular cyclic AMP content and a strong stimulation of DNA synthesis, but the stimulated cells do not enter mitosis. Thus, calcium selectively inhibits the cyclic AMP-induced mitogenic process. The calcium-sensitive phase of the mitogenic reaction is normally completed by only 2.5 min after exposure to PGE 1 ; addition of calcium to the extracellular fluid at, or after, this time does not inhibit the flow of stimulated cells into mitosis which begins between 3 and 4 hr later. Finally, calcium must inhibit the operation, but not the cyclic AMP-mediated activation, of the mitogenic system since the inhibition can be fully relieved by removal of calcium at least 4 hr after exposure to PGE 1 .
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
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".