An analysis of the thyroid role in juvenile steelhead (Salmo Gairdneri Richardson) and factors responsible for its seasonal fluctuation in activity.
Bibliographic record
Abstract
Investigation of factors controlling seasonal changes in thyroid activity of juvenile steelhead trout (Salmo gairdneri Richardson) in fresh water revealed positive correlations between temperature and radioiodine assessments of thyroid activity. Temperature and thyroid epithelial height, however, showed negative correlations. These correlations were verified experimentally. In yearlings the thyroid was refractory to increasing photoperiod (January to July) but two-year-old potential migrants showed a positive response at the same season. Thus, the high smolt thyroid activity is induced by the combined influence of rising temperature and increasing spring photon period. Body mass (logarithm) was inversely related to various I¹³¹parameters (logarithm), so that small fish had higher thyroid activities than large fish. Precocious sexual maturation of two-year-old male parr, increased swimming exercise and increased salinity were associated with higher thyroid activity Increase in ambient I¹²⁷ depressed thyroid activity and indicated that the activity of the gland (assessed by current methods) is partly a compensation for low l¹²⁷ availability. The high thyroid activity of the smolt may be due partly to endemic goitre. Since low temperature and 8-hour daylength inhibited the thyroid activity of potential migrants but did not prevent silvering, the role of thyroxin in guanine deposition under natural conditions is doubted. Possible radiohormone catabolic sites were located in metabolically active tissues including gut, kidney, liver and brain. These findings suggest a general rather than a tissue-specific role of thyroxin in metabolism. It is concluded that thyroxin may have no stimulatory role in smoltification but reflects instead the total metabolic demands on the tissues.
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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) | 0.000 | 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 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".