Variability of photosynthesis genes in purple bacteria and molecular determinants of their spectral properties
Bibliographic record
Abstract
The structural genes of the photosynthetic apparatus of two purple bacteria, Amoebobacter (Amb.) purpureus ML1 and Roseospirillum (Rss.) parvum 930I, were investigated by molecular biological methods. Analyses were focused on their light harvesting (LH) 1 core antenna, which is encoded within the puf operon. The puf-operon of the purple sulfur bacterium Amb. purpureus differs from the puf operon of the purple non-sulfur bacteria by exhibiting multiple copies of the LH1 genes pufBA and by variations in gene transcription and expression. Horizontal transfer of genes between Amb. purpureus and Allochromatium vinosum might have played a role during the evolution of the multiple pufA genes. Along with extraordinary absorption properties of the LH1-antenna (909 nm), Rss. parvum exhibits substitutions of amino acids within the LH1 alpha and beta polypeptides at positions that are highly conserved in other purple bacteria. 3D structural models of the polypeptides suggest that cysteine side chains in particular are involved in the modulation of the spectral properties of Rss. parvum.
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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) | 0.000 | 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 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".