Rapid increase in the partial pressure of NH3 on the cutaneous surface of air-exposed mangrove killifish,<i>Rivulus marmoratus</i>
Bibliographic record
Abstract
Mangrove killifish, Rivulus marmoratus, are tolerant of prolonged periods of air exposure (>30 days). Air-exposed R. marmoratus eliminate more than 40% of their total ammonia through NH(3) volatilization; however, the sites and mechanisms are unclear. We hypothesized that the cutaneous surface is an important site of NH(3) volatilization in air-exposed R. marmoratus. Ion-selective microelectrodes were used to measure the NH(4)(+) concentration and pH in the boundary layer on the cutaneous surface of fish in water or air (acute: 1 h, chronic: 11 days). Following acute and chronic air exposure, there was a approximately 18-fold increase in the NH(4)(+) concentration and a 0.3-0.6 pH unit increase on the cutaneous surface of R. marmoratus. In air-exposed fish, the calculated cutaneous partial pressure (P(NH(3))) was 608-1,251 microTorr, representing a 33- to 75-fold increase over control (immersed) fish. The P(NH(3)) on the cutaneous surface water film was more than sufficient to account for the rate of NH(3) volatilization under terrestrial conditions. Together, these data indicate that during air exposure, R. marmoratus utilize the cutaneous surface as a key site of NH(3) volatilization.
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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) | 0.001 | 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".