Bibliographic record
Abstract
Abstract The Gram‐positiveStreptomycesbacteria are major inhabitants of soil, and, unusually for bacteria, they have a complex, multicellular life cycle that looks remarkably fungal‐like. Vegetative growth involves the extension of multicellular, branching hyphae, while reproductive growth involves the emergence of nonbranching hyphae into the air, away from the branching vegetative hyphal mass. These aerial hyphae are converted into chains of prespore compartments by coordinated cell division and chromosome segregation. Prespores then mature into thick‐walled spores that have condensed nucleoids, low metabolic activity and are primed for dispersal and survival. Aerial hyphae and spore surfaces are coated with a hydrophobic, proteinaceous fibrous sheath that aids in aerial growth and may help to promote subsequent spore dispersal and interaction with various interfaces. When exposed to appropriate environmental conditions, spores re‐establish metabolic activity, initiate germination and begin the vegetative phase of their life cycle anew. Key Concepts Streptomycesspores are distinctly different from bacterial endospores and may be regarded as a type of exospore. Spores develop from dedicated reproductive structures called aerial hyphae. Streptomycesspores are formed by partitioning long, multigenomic hyphal cells into unigenomic prespore compartments, through developmentally regulated cell division and chromosome segregation events. An outer fibrous sheath, containing the lanthionine peptide SapB, the chaplins and the rodlins, confers surface hydrophobicity to aerial hyphae and spores. A dedicated ‘Streptomycesspore wall synthesis complex’ directs the development of a thick spore wall that contributes to mature spore quiescence and resilience. Spores have reduced metabolic activity, accumulate trehalose and have condensed nucleoids. Germination involves rehydration, symmetrical swelling and establishment of polar growth, leading to germ tube emergence and vegetative hyphal outgrowth.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.004 |
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".