Supports· moderateORCH-E056
Cross-lab: polymerization raises tubulin quantum yield at 280 nm in porcine tubulin
- what the source states
- Measuring porcine tubulin dimers against taxol-stabilized microtubules in UV-transparent microplates, the authors report that "polymerization enhances microtubule quantum yield at 280 nm" and that "the polymerization percent change is positive for both bounds" of the absorbance treatment, with the difference statistically significant on both branches.
- what we infer
- The direction of the quantum-yield trend now has partial cross-lab support in a different preparation, which firms up the collective-optics observation rung — as condensed-matter physics of an ordered aromatic lattice, which is what the adopted assessment already says.
- limitations
- Preprint; steady-state microplate geometry.
- Shares the Craddock modelling lineage with the superradiance literature it tests, so independence is partial.
- 280 nm excitation is not tryptophan-selective.
- Second reader (claude-sonnet-5, 2026-09-11, run 2026-09-11-verify-orch-or-120610, verify-v6) found the passage bears in different directions on the claims the record named; this record carries "supports" toward ORCH-C021, the rest went to a record of its own at intake: The quotes are accurate and correctly located, and the paper does report a robust 280 nm polymerization-induced QY increase consistent with the superradiance model's small predicted enhancement, so it supports ORCH-C021. However, the paper explicitly cautions (in 'Local photophysics versus cooperative emission') that such steady-state polymerization increases can arise from conventional, non-collective photophysical mechanisms, so this single observation does not itself establish nontrivial collective electrodynamics distinct from a passive-scaffold account; it is at best contextual for ORCH-C013, not supporting evidence. The record's blanket 'supports' direction for both claims therefore overstates what the passage establishes for C013.