Sensing of Elevating CO<sub>2</sub>in a Marine Diatom
Bibliographic record
Abstract
One of the critical parts of the CO(2) perception mechanisms in algae has now been identified in a marine diatom, an important finding since diatoms are the major primary producer in the ocean. Increasing CO(2) might probably be sensed directly by the cAMP forming enzyme, adenylyl cyclase, and cytosolic cAMP represses expression of CCM components in marine diatoms. Upstream sequences of CO(2)-responsive genes, ptca1 and 2, for carbonic anhydrases (CA) in the marine diatom Phaeodactylum tricornutum, were recently isolated and characterized. Promoters for both ptca1 and 2 possess at least 5 CREs respectively at -10 to -330 and at -330 to -630 relative to each transcription-start site. Our recent experiments clearly showed that one of CREs, located at -70 to -63 of the ptca1 promoter, exhibited a primary role in repressing the ptca1 promoter under high CO(2) or in the dark. Truncations of CREs in the ptca2 promoter also resulted in derepressions of the ptca2 gene in high CO(2). This addendum will discuss the implication of acquiring repression systems for the CCM and the possible impact of the repression of the CCM following a direct perception of elevated [CO(2)] in the marine environment.
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How this classification was reachedexpand
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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".