Acclimation to elevated carbon dioxide and ultraviolet radiation in the diatom <i>Thalassiosira pseudonana</i>: Effects on growth, photosynthesis, and spectral sensitivity of photoinhibition
Bibliographic record
Abstract
We studied the effects of elevated CO 2 concentrations (0.03% vs. 0.1%) on light absorption, membrane permeability, growth, and carbon fixation under photosynthetically active radiation (PAR) and ultraviolet radiation (UVR) exposures in the diatom Thalassiosira pseudonana . Susceptibility of photosynthesis to UVR was estimated using biological weighting functions (BWFs) for the inhibition of photosynthesis and a model that predicts primary productivity under PAR and UVR exposures. Elevated CO 2 concentrations reduced chlorophyll content and increased chlorophyll specific cross section, carbon fixation per chlorophyll, and growth rates. In addition, cells acclimated to high CO 2 were more sensitive to photoinhibitory UVR than those under atmospheric levels. Sensitivity to UVR was also related to the growth light regime; despite the fact that no UVR effects were observed on growth, light absorption, or carbon fixation, cells pre‐exposed to UVR showed reduced photoinhibition compared to those grown under PAR for both normal and elevated CO 2 cultures. Thus, acclimation to UVR partially counteracted the increased susceptibility observed under elevated CO 2 conditions.
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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".