Bibliographic record
Abstract
Canada leads the world with new regulations to prohibit the importation, sale and advertising of polycarbonate baby bottles that contain bisphenol A (BPA). The world production of BPA is currently 3.3 billion kilograms per year, half a kilogram per person. The estrogenic activity of BPA has been known at least since 1936. Estrogens have biological effects at parts per billion. BPA is used in food and beverage containers, including baby bottles, some drink bottles, and food container linings, in particular can linings. A recent study in the USA reported that all the adult subjects tested had bisphenol A in their urine. Canada has just declared bisphenol A to be a toxic substance. Canada has responded to the accumulating evidence that BPA leaches from polycarbonate baby bottles and behaves like an estrogen. An extra dose of female sex hormones is not the best of dietary supplements for babies, either male or female; or for teenagers, or even adults. Canada is the first country in the world to act to banish bisphenol A from the nursery.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.005 | 0.011 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.006 | 0.009 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.010 | 0.008 |
| Insufficient payload (model declined to judge) | 0.014 | 0.005 |
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".