Production of methyl halides by <i>Prochlorococcus</i> and <i>Synechococcus</i>
Bibliographic record
Abstract
The ocean is the dominant source of atmospheric methyl iodide (CH 3 I). The mechanisms of CH 3 I production in the marine environment are poorly understood. A previous laboratory and field study suggested Prochlorococcus marinus , a ubiquitous marine cyanobacterium, is a globally significant biological producer of CH 3 I. In this study, CH 3 I concentrations were measured in cultures of P. marinus (high‐light‐adapted MED4 and low‐light‐adapted CCMP 1427) and the marine cyanobacterium Synechococcus . Cell‐normalized production rates from P. marinus cultures (MED4) averaged 1.6 (±0.9) molecules of CH 3 I cell −1 d −1 ; these rates were 1000‐fold lower than production rates reported for the previous study, which reported comparable concentrations of CH 3 I in cultures but cell concentrations about 1000‐fold lower than measured in this study. Extrapolating CH 3 I production rates from the current study yields a global production rate of 0.6 Mmol yr −1 which accounts for 0.03% of the estimated global CH 3 I production, suggesting P. marinus is not a globally significant source of CH 3 I.
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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 | 0.000 | 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 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".