fibril
Enable an agent to recognise this extracellular matrix material, assess evidence of its composition and organisation, and report observations with their limits.
Bundle → Layer → Finding → Questions Filled
5 bundles · 9 layers · 14 findings · 22 questions
Fibril identity and boundaries Establishes what the term fibril denotes for the observed material and which structural unit is being modelled.
Material-specific recognition
Connects the fibril label to explicit morphological and contextual evidence.
Operational fibril definition
Record the criteria used to call this structure a fibril without imposing an unsupported universal size cutoff.
- What definition of fibril applies to this material, and which observable criteria does it require? definition
- Which observation or reference supports applying that definition to this structure? provenance
Strand and bundle boundaries
Distinguishes the selected fibril from constituent strands and enclosing assemblies.
Resolved structural unit
Record whether the selected object is a single fibril, an unresolved assembly or a larger structure described using overlapping terminology.
- What evidence distinguishes this fibril from a bundle of smaller strands? boundary
- How does the applicable terminology distinguish fibril from fibre, filament and microfibril? definition
Fibril morphology and resolution Describes elongated geometry together with the observation limits that affect it.
Longitudinal geometry
Captures contour length, curvature and visible endpoints.
Traceable length and continuity
Distinguish contour length from endpoint separation and identify truncated or obscured traces.
- What are the contour length and endpoint separation, and are both physical ends visible? measurement
- Where do overlaps, apparent junctions or image boundaries prevent reliable tracing of one fibril? boundary
Transverse geometry
Captures transverse size and variation without assuming a circular cross-section.
Resolved cross-section
Record measured width or height, variation along the axis and evidence supporting any inferred diameter.
- Which transverse dimensions were measured, in what units, and how do they vary along the fibril? measurement
- How do resolution, substrate contact and specimen preparation affect the reported dimensions? provenance
Constituents and fibrillar organisation Links material identity to organisation within and between fibrils.
Constituents and internal order
Separates evidence about chemical constituents from evidence about their arrangement.
Supported internal architecture
Record constituent identification and observed internal organisation independently, preserving unresolved assignments.
- Which constituents have been identified in this fibril, and by what evidence? provenance
- What measurements support any assigned axial repeat, twist or internal arrangement? measurement
Interfibril and host relations
Describes association with other fibrils and placement within a surrounding material.
Fibrillar assembly membership
Identify the fibril's parent assembly and distinguish observed contact from demonstrated connection.
- Is this fibril isolated, bundled, entangled or embedded, and which larger structure contains it? boundary
- What evidence distinguishes physical connection between fibrils from overlap in an image? provenance
Fibril condition and intervention Tracks structural changes and supports actions that depend on preserving or deliberately altering fibrillar form.
Integrity and condition history
Relates visible damage and morphological changes to the specimen's exposure and preparation history.
Interpretable structural change
Record breaks, fraying and other changes relative to a stated baseline while distinguishing specimen history from inferred causes.
- Which changes in continuity, transverse size or organisation are observed relative to the baseline? measurement
- What preparation, storage and exposure history is known before those changes were observed? provenance
Structure-sensitive actions
Connects proposed manipulation to the fibrillar features that must be preserved or changed.
Action and structural acceptance
Specify the intended outcome of isolation, dispersion or treatment and how the fibril's resulting condition will be assessed.
- Which fibrillar features must the proposed action preserve, and which may it deliberately alter? action
- What before-and-after observations will establish whether the action achieved an acceptable result? measurement
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of fibril this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these kinds and varieties hold for the sense of fibril this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of fibril this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of fibril this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of fibril this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of fibril this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
A fibril, in this sense, is a fine, threadlike extracellular matrix material consisting of polysaccharides and protein.
In scope
- Evidence of extracellular matrix context and polysaccharide and protein composition is included.
- Fibril length, transverse dimensions, shape and continuity are included.
- Constituent material and internal organisation are included.
- Relationships to neighbouring fibrils and the surrounding extracellular matrix are included.
- Aggregation, damage and changes under specified conditions are included.
Out of scope
- Synthetic fibrils and other threadlike structures outside the specified extracellular matrix sense are excluded.
- The complete biological organism or tissue containing the fibrils is excluded.
- The chemical identity and intrinsic hazards of each constituent substance are excluded.
- The full biological assembly process is excluded.
- Clinical diagnosis associated with particular fibrillar deposits is excluded.
- Bulk material properties not related to this extracellular matrix structure are excluded.
Why it exists Filled
Enable an agent to recognise this extracellular matrix material, assess evidence of its composition and organisation, and report observations with their limits.
Distinguishing features Filled
- Identity requires evidence of extracellular matrix context and both polysaccharide and protein constituents.
- A threadlike appearance alone does not establish this material identity.
- The term fibril in synthetic materials or other biological contexts does not establish equivalence to this sense.
- Distinguishing an individual fibril from unresolved strands depends on imaging resolution and evidence of constituent boundaries.
- Size alone is insufficient to distinguish this material from other fine structures.
What robots and AI may and may not do Filled
Must not
- Treat all biological or synthetic fibrils as this extracellular matrix material.
- Misreport fibril size or composition in safety or quality data.
- Declare biological material safe to handle without supporting evidence.
Only with a human decision
- Decisions about biological sample use and handling require responsible human oversight.
May
- Describe fibrils in the specified extracellular matrix context.
- Report fibril measurements with method and source.
Moral aspects Filled
- Accurate reporting of biological origin and composition matters for research integrity.
- Biological sample use must respect applicable consent and stewardship requirements.
Who is affected
- Sample donors are affected where human material is involved.
- Researchers and sample handlers are affected.
Owners Filled
Steward
The responsible sample custodian stewards material and records; the structural category itself has no owner.
Links to other meta-models Filled
parent
- Q22329219 - registry parent class
- Q28843519 - registry parent class
- Q28969293 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.fibril
- Wikidata: Q14860849 (https://www.wikidata.org/wiki/Q14860849)
Direct properties required Filled
- Material-specific fibril class: Reported class and its operational definition; unresolved
- Constituent material: Links to constituent substances or macromolecular species, with evidence and uncertainty
- Contour length: nm or µm, with tracing method, uncertainty and whether both ends are visible
- Transverse dimensions: Width, height or diameter in nm or µm, with method and cross-section assumptions
- Aspect ratio: Dimensionless length-to-transverse-size ratio, with the dimensions used identified
- Axial and internal organisation: Observed twist, repeat pattern, constituent arrangement or unresolved organisation
- Structural level: Constituents, peer fibrils, enclosing bundle or fibre, and host material
- Association state: Isolated, laterally associated, bundled, entangled, embedded or unresolved
- Structural integrity: Observed continuity, fractures, fraying or other alterations, with observation conditions
- Condition during observation: Temperature, surrounding medium, hydration, substrate contact and applied loading where relevant
Recognition required Filled
- Microscopic images may show fine, elongated extracellular structures.
- Images alone do not establish polysaccharide and protein composition.
Capabilities and actions required Filled
- Classify an observed strand using material-specific fibril criteria and record unresolved alternatives.
- Measure dimensions and organisation with methods capable of resolving the relevant structural level.
- Trace how individual fibrils contribute to a bundle, fibre or host material.
- Compare fibril morphology before and after a specified treatment or environmental change.
- Select an isolation, dispersion or manipulation procedure using constituent identity and evidence of structural sensitivity.
Hazards and failure modes required Filled
- Morphology alone can lead to confusion with unrelated fibrillar materials.
- Unsupported assumptions about composition or biological origin can mislead interpretation.
- Sample handling risks depend on the biological source and associated material.
Standards and interfaces not applicable Not applicable
Not applicable
No universal standard, law or official classification applies specifically to extracellular matrix fibrils across all compositions and uses.
Context of use required Filled
- Extracellular matrix fibrils are encountered when examining the fine structural organization of biological tissues and matrix materials.
- Their composition, alignment and assembly are studied to understand tissue support, interactions with cells and changes associated with damage or repair.
- Microscopy and material characterization help distinguish individual fibrils from larger fibres and surrounding matrix components.
Sources Filled
- Wikidata item Q14860849: fibril - identity and sense of the item
- Wikipedia: Fibril - general description of the item
Open questions
- Does the registry intend fibril as a general material morphology or a narrower biological or material-specific concept?
- Which authoritative definitions govern the boundaries among fibril, microfibril, filament and fibre for the intended coverage?
- Which related registry entries or existing world models already own overlapping structural concepts?
- Which measurement and specimen-preparation conventions are needed to compare fibril dimensions across material classes?
- Which material-specific evidence is required before recommending isolation, dispersion or other structure-altering actions?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q14860849/spec.json