Bibliographic record
Abstract
A mature bordered pit in secondary xylem of Pinaceae comprises a circular border of secondary-wall material that protrudes into the tracheid lumen and is punctuated by a centralized aperture through which sap flows. The overarching border encloses a pit chamber within which is a “membrane”, or diaphragm, consisting of a central torus and margo strands. Bordered-pit pairs are abundantly present in all woods, and their membranes serve as swinging-diaphragm check valves regulating sap flow between adjoining tracheary elements, simultaneously trapping emboli and particulates in water as it moves from roots to leaves. The cell biology of bordered-pit formation in cambial derivatives of Abies balsamea (L.) Mill. was investigated by light and scanning electron microscopy during early stages of cellular differentiation of cambial derivatives into secondary xylem tracheids. A bordered-pit template (BPT), a bordered-pit organelle (BPO), a bordered-pit basal disk, and additional novel structures were found to be associated with bordered-pit formation. Evidence was found that the membrane does not comprise residual compound middle lamella; rather, the membrane forms de novo as BPO remnants. A cell-biology model and new terminology are introduced to explain how BPTs, BPOs, and basal disks contribute to successive stages in formation of bordered-pit pairs.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 teacher head, 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".