Bibliographic record
Abstract
Abstract Polyhydroxyalkanoates (PHAs) are polyesters, usually of 3‐hydroxycarboxylic acids, accumulated as inclusion bodies by bacteria. At least two classes of PHAs exist. Each is composed of many different homo‐ and copolymers. Most can be produced from renewable resources, are readily environmentally degradable, and are relatively resistant to abiotic hydrolysis. Polymers with reactive groups in their side chains can be synthesized to allow further chemical processing, leading to an even greater selection of polymeric materials. Thermomechanical properties vary from hard and brittle to elastomeric and tough. From the poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) copolymer alone, blow‐molded, injection‐molded, woven fiber, and coated paper products have been fabricated. Other properties of biologically produced PHAs such as optical purity, compatibility with human tissue, and piezoelectric properties make these materials of great commercial interest. They would certainly find wide application if it were not for their present high cost of production.
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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 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) | 0.031 | 0.024 |
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".