Bibliographic record
Abstract
Aims/Purpose: Aquaporins are specialized water channels. A volume change through permeable aquaporins may be necessary for the lens' ability to change shape during accommodation1. This study aimed to determine the effects of zinc2, an agonist that increases aquaporin 0 (AQP0) permeability in oocytes, on the biomechanics of chicken lenses. Methods: White Leghorn chickens (Gallus gallus domesticus, N = 6) were sacrificed at 14 days of age. Both eyes were enucleated and lenses were dissected in Tyrode's solution (TS). One lens from each bird was treated with zinc chloride (80 μg/mL in TS for 15 min, at room temperature; RT), while the other lens (control lens) was incubated in TS (15 min, RT). Lenses were compressed (CellScale Micro Tester G2) to test their biomechanical integrity. For each lens, force‐compression data were generated by the MicroTester G2 software (ver. 1.0.0.1) and fit to a three‐parameter exponential curve with the equation y = y0 + aebx; the unitless b‐coefficient of the exponential equation was used to assess stiffness as it describes how rapidly the force increases as the compression distance increases. B‐coefficients from each curve were extracted and the effects of zinc treated versus control lenses were analysed using a paired t‐test. Results: The b‐coefficient value for zinc‐treated lenses averaged to 4.2 ± 0.8 while the mean value for control lenses was significantly (p = 0.01) lower at 3.2 ± 0.5, indicating that zinc‐treated lenses were stiffer. Conclusions: The compression data show a zinc‐associated increase in lens stiffness. AQP0 typically plays a role in allowing water to enter, but not exit, the lens, therefore zinc may have led to an increase in water content, resulting in stiffer lenses. However, water permeability was not measured in this study, therefore the AQP0‐associated mechanism of lens stiffening cannot be confirmed. Further study is needed to determine zinc's action on the biomechanics of the lens. References 1. Gerometta R, Candia OA. A decrease in the permeability of aquaporin zero as a possible cause for presbyopia. Medical Hypotheses. 2016 Jan 1;86:132–4. 2. Németh‐Cahalan KL, Kalman K, Froger A, Hall JE. Zinc modulation of water permeability reveals that aquaporin 0 functions as a cooperative tetramer. The Journal of general physiology. 2007 Nov;130(5):457–64.
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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) | 0.002 | 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".