Photolyase activity of the embryo and the ultraviolet absorbance of embryo jelly for several Ontario amphibian species
Bibliographic record
Abstract
Organisms whose eggs develop at or near the interface between air and water may be particularly vulnerable to damage from ultraviolet radiation. The primary form of ultraviolet B (UV-B) radiation damage to biological systems is the formation of cyclobutane pyrimidine dimers (CBPDs) in DNA. The most common method of repairing this damage is photoenzymatic repair via photolyase, whose actions are specific to CBPDs. We utilized a bacterial-transformation assay to estimate the level of photolyase activity of various tissue types in seven species of amphibians collected in south-central Ontario. In this assay, the photolyase activity of a species is measured as the rate of CBPD removal from UV-B-damaged plasmid DNA by cell-free extracts created from the tissue of the species in question. The depth of oviposition and the UV-B absorbance of the embryo jelly, two variables that alter an embryo's in situ exposure to UV-B radiation, were measured to determine whether the level of photolyase activity was correlated with expected UV-B exposure. In vitro measurements of photolyase activity for the seven species were significantly different (F[6]= 10.31, p < 0.0001) and tended to be positively correlated with expected in vivo exposure to UV-B radiation.
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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 | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 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".