{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T11:35:47Z", "providers": [ "Codex" ], "breadth": "recalled by Codex without web access - no source was read", "missingProviders": [], "pass": 2, "cost": { "grok": { "seconds": 20.4, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a09565-8c5e-7d72-b158-9832bb7514aa\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: nigericin\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 044: 1001 regis", "usd": 0.0, "recall": true }, "codex": { "seconds": 92.0, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a09565-8c5a-71e3-b1be-7262f969abda\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: nigericin\nRegistry id: vr.tr.nigericin\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nCont" } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T12:00:00Z", "ingestedAt": "2026-10-06T08:54:52+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "standards_and_regulation", "visual_identification" ] } }, "metaModel": { "id": "THING-Q7033077", "registryId": "vr.tr.nigericin", "name": "nigericin", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q7033077/", "model": { "registry_id": "vr.tr.nigericin", "name": "nigericin", "purpose": "Enable an AI agent to recognise nigericin, assess a sample's chemical and functional state, and judge its suitability for a specified research use.", "definition": "Nigericin is a microbial polyether antibiotic that acts as a mobile ion carrier, exchanging potassium ions for protons across lipid membranes and thereby altering ion and pH gradients.", "scope_statement": "This model owns vr.tr.nigericin in PHY / PHY.MAT: the polyether antibiotic and potassium ionophore, its chemical identity, material forms, sample quality, conditional transport activity, and handling constraints; supplied salts are recorded explicitly without creating additional registry entries.", "in_scope": [ "Molecular identity, stereochemistry, identifiers, and distinction between free acid and supplied salts", "Lot composition, purity, concentration, and analytical evidence", "Physical state, solubility, storage history, and stability", "Potassium-proton exchange under specified membrane and solution conditions", "Suitability and interpretation limits for ion-gradient and cellular research", "Form-specific hazard documentation and permitted handling" ], "out_of_scope": [ "Supplier products, packaging, pricing, and procurement workflows", "Producing organisms and fermentation or synthesis processes", "Complete inflammasome, mitochondrial, or cell-death pathway models", "Experimental protocols and instrument operation", "Clinical treatment decisions and therapeutic efficacy", "Other ionophores as independently modelled substances" ], "distinguishing_features": [ "Require a structure and stereochemistry match rather than identification from antibiotic activity alone; nigericin is a polyether antibiotic with free-acid formula C40H68O11. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/Nigericin)", "Distinguish the free acid, PubChem CID 34230, from sodium nigericin, CID 16760591 and formula C40H67NaO11; a shared parent name does not establish identical weighing or concentration calculations. [PubChem sodium nigericin](https://pubchem.ncbi.nlm.nih.gov/compound/16760591)", "Test for coupled, electroneutral potassium-proton exchange when distinguishing nigericin's transport mechanism from electrogenic potassium transport; transport behaviour supplements chemical identification. [Primary study](https://pmc.ncbi.nlm.nih.gov/articles/PMC10786283/)", "Do not identify nigericin by an inflammasome readout or label it exclusively NLRP3-specific: a primary study also reports NLRP1 activation in human epithelial cells. [Primary study](https://pmc.ncbi.nlm.nih.gov/articles/PMC10786283/)" ], "characteristics": [ { "name": "Chemical identity", "kind": "category", "unit_or_values": "Structure with stereochemistry; molecular formula; form-qualified CAS, PubChem, ChEBI, and EC identifiers", "why_it_matters": "Prevents confusion between the parent substance, salts, and related polyether antibiotics." }, { "name": "Supplied chemical form", "kind": "category", "unit_or_values": "Free acid, specified salt, specified solvate, or unresolved", "why_it_matters": "Determines the applicable formula mass and interpretation of declared content." }, { "name": "Nigericin content and purity", "kind": "measurement", "unit_or_values": "Mass fraction %, chromatographic area %, and water or residual-solvent content, each with method", "why_it_matters": "Chromatographic purity alone does not establish the mass of active material." }, { "name": "Preparation concentration", "kind": "measurement", "unit_or_values": "mg/mL or mmol/L, with chemical form and assay correction", "why_it_matters": "Supports comparable exposures and avoids free-acid versus salt calculation errors." }, { "name": "Physical and solution state", "kind": "state", "unit_or_values": "Solid or solution; solvent; dissolved, precipitated, or unresolved; temperature in °C", "why_it_matters": "Nominal content may differ from material available in the working solution." }, { "name": "Condition-qualified physical constants", "kind": "measurement", "unit_or_values": "Solubility in mg/mL; melting or decomposition temperature in °C; boiling data only if supported, with pressure", "why_it_matters": "Keeps form- and method-dependent measurements from becoming universal constants." }, { "name": "Ion-transport conditions", "kind": "measurement", "unit_or_values": "K+ and Na+ concentrations in mmol/L on both membrane sides; pH; temperature in °C; membrane composition", "why_it_matters": "Defines the environment needed to interpret transport direction and magnitude." }, { "name": "Functional potency", "kind": "measurement", "unit_or_values": "Transport rate or concentration-response endpoint with assay, exposure duration, and reference lot", "why_it_matters": "Separates chemical purity from demonstrated activity." }, { "name": "Biological test context", "kind": "relation", "unit_or_values": "Cell or membrane system, priming state, medium, controls, and measured endpoint", "why_it_matters": "Prevents transfer of activity claims between incompatible biological contexts." }, { "name": "Handling eligibility", "kind": "state", "unit_or_values": "Approved for specified use, restricted, quarantined, or unresolved; linked SDS version and jurisdiction", "why_it_matters": "Connects decisions to evidence for the actual material and intended use." } ], "affordances": [ "Resolve a labelled material to nigericin and its explicitly stated chemical form.", "Compare lots using identity, content, impurity, and functional evidence.", "Calculate form-corrected concentrations from verified material content.", "Assess whether a preparation is suitable for a specified ion-gradient or cellular assay.", "Interpret observed responses against transport conditions and pathway-specific controls.", "Determine whether storage, handling, or disposal actions meet the applicable documented requirements." ], "agent_conduct": { "may": [ "Identify nigericin as a potassium-proton ionophore used in research, citing sources.", "Report the grade, storage and safety data of a held research stock." ], "must_not": [ "Assist anyone in using it to harm people or animals.", "Recommend it as a treatment or supplement for a person.", "Give handling information beyond its safety data sheet that lowers barriers to misuse.", "Dispose of it in drains or general waste." ], "requires_human": [ "Ordering, transferring or disposing of stock.", "Using it in any study involving animals." ] }, "ethics": { "considerations": [ "It disrupts cellular ion balance and is toxic, so careless handling endangers workers.", "Research toxins require control to prevent misuse." ], "affected_parties": [ "Laboratory workers", "Research animals", "Waste handlers" ] }, "owners": { "steward": "The laboratory that holds the stock; institutional safety officers oversee its use.", "master_systems": [ "Laboratory chemical inventories" ] }, "visual_identification": [ "Supplied as a small quantity of white solid or solution in a labelled vial.", "Not identifiable by sight; label and analysis settle identity." ], "failure_modes_and_hazards": [ "Toxic exposure through skin contact or ingestion.", "Contaminated experiments from wrong concentration or degraded stock." ], "standards_and_regulation": [ "Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations." ], "what_it_is_for": [ "Nigericin is used in laboratory research to study ion transport and pH gradients across biological membranes.", "It is also used in cell biology research investigating inflammasome activation and associated inflammatory responses." ] }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q7033077: nigericin", "url": "https://www.wikidata.org/wiki/Q7033077", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: Nigericin", "url": "https://en.wikipedia.org/wiki/Nigericin", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "nigericin-identity", "name": "Nigericin identity", "description": "Establish which chemical entity a nigericin-labelled material represents.", "rationale": "A parent name cannot settle stereochemistry, salt form, or identifier equivalence.", "layers": [ { "id": "molecular-recognition", "name": "Molecular recognition", "description": "Anchor recognition to the nigericin molecular structure.", "findings": [ { "id": "structure-confirmation", "name": "Structure confirmation", "description": "Record structural evidence sufficient to distinguish nigericin from related polyether compounds.", "questions": [ { "text": "Which reference structure and stereochemical specification define nigericin for this entry?", "kind": "definition", "id": "structure-confirmation-q01" }, { "text": "Which analytical evidence establishes that the sample matches that structure rather than merely showing similar activity?", "kind": "measurement", "id": "structure-confirmation-q02" } ] } ] }, { "id": "form-and-identifiers", "name": "Form and identifiers", "description": "Resolve the relationship between the parent substance and the supplied material.", "findings": [ { "id": "form-qualified-identity", "name": "Form-qualified identity", "description": "Keep free acid, counterion, solvation, and identifier scope explicit within the existing registry boundary.", "questions": [ { "text": "Is the material the free acid, a specified salt, a solvate, or an unresolved preparation?", "kind": "definition", "id": "form-qualified-identity-q01" }, { "text": "Which CAS, PubChem, ChEBI, and EC records apply to that exact form, and which records were checked?", "kind": "provenance", "id": "form-qualified-identity-q02" }, { "text": "Which label names denote nigericin itself and which denote a formulation containing it?", "kind": "boundary", "id": "form-qualified-identity-q03" } ] } ] } ] }, { "id": "lot-content-and-integrity", "name": "Lot content and integrity", "description": "Determine how much identified nigericin a sample contains and whether it remains usable.", "rationale": "Purity, counterion, solvent, and deterioration can change effective exposure without changing the label.", "layers": [ { "id": "assayed-composition", "name": "Assayed composition", "description": "Connect declared purity to quantitative material content.", "findings": [ { "id": "content-basis", "name": "Content basis", "description": "Separate nigericin mass content from chromatographic area purity and other constituents.", "questions": [ { "text": "Does the reported purity measure mass fraction, chromatographic area, or another quantity?", "kind": "measurement", "id": "content-basis-q01" }, { "text": "How do water, residual solvent, counterion, and detected impurities affect the amount of nigericin represented by a weighed sample?", "kind": "measurement", "id": "content-basis-q02" }, { "text": "Which lot-specific certificate or analysis supports the declared content?", "kind": "provenance", "id": "content-basis-q03" } ] } ] }, { "id": "integrity-over-time", "name": "Integrity over time", "description": "Assess whether handling history has compromised chemical or functional quality.", "findings": [ { "id": "stability-and-retest", "name": "Stability and retest", "description": "Tie continued suitability to evidence for the relevant solid or solution form.", "questions": [ { "text": "What storage and opening history is recorded for this nigericin lot or stock?", "kind": "provenance", "id": "stability-and-retest-q01" }, { "text": "Which measurements detect loss of nigericin content, impurity growth, or loss of transport activity?", "kind": "measurement", "id": "stability-and-retest-q02" }, { "text": "What evidence warrants continued use, retesting, or quarantine?", "kind": "action", "id": "stability-and-retest-q03" } ] } ] } ] }, { "id": "physical-state-and-preparation", "name": "Physical state and preparation", "description": "Represent the material state and concentration available to an experiment.", "rationale": "A weighed quantity or stock label does not establish a fully dissolved, correctly quantified working preparation.", "layers": [ { "id": "form-dependent-properties", "name": "Form-dependent properties", "description": "Record physical properties with their chemical form and measurement conditions.", "findings": [ { "id": "solubility-and-thermal-behaviour", "name": "Solubility and thermal behaviour", "description": "Qualify physical constants rather than transferring values between unspecified preparations.", "questions": [ { "text": "What nigericin solubility is supported in the relevant solvent or medium at the stated temperature and pH?", "kind": "measurement", "id": "solubility-and-thermal-behaviour-q01" }, { "text": "Do reported thermal values describe melting, decomposition, or boiling, and for which form and measurement conditions?", "kind": "measurement", "id": "solubility-and-thermal-behaviour-q02" } ] } ] }, { "id": "available-concentration", "name": "Available concentration", "description": "Translate assayed material into a defensible preparation concentration.", "findings": [ { "id": "concentration-validity", "name": "Concentration validity", "description": "Track formula-mass basis, dilution, and evidence of incomplete dissolution.", "questions": [ { "text": "Which chemical form, formula mass, and content correction underlie the reported molar concentration?", "kind": "measurement", "id": "concentration-validity-q01" }, { "text": "Is the working preparation fully dissolved after dilution, and how was this assessed?", "kind": "measurement", "id": "concentration-validity-q02" }, { "text": "What preparation evidence is required before comparing this exposure with another nigericin experiment?", "kind": "action", "id": "concentration-validity-q03" } ] } ] } ] }, { "id": "potassium-proton-transport", "name": "Potassium-proton transport", "description": "Describe nigericin activity through measured ion exchange and its environmental dependencies.", "rationale": "Transport direction, selectivity, and rate require membrane and solution context.", "layers": [ { "id": "exchange-mechanism", "name": "Exchange mechanism", "description": "Identify the coupled transport process supported in the tested system.", "findings": [ { "id": "coupling-and-selectivity", "name": "Coupling and selectivity", "description": "Distinguish evidence for coupled exchange from ion binding or nonspecific membrane leakage.", "questions": [ { "text": "What measurements support coupled K+/H+ exchange and its stoichiometry in this system?", "kind": "measurement", "id": "coupling-and-selectivity-q01" }, { "text": "Do reported selectivity values describe binding affinity, transport rate, or a downstream biological response?", "kind": "boundary", "id": "coupling-and-selectivity-q02" }, { "text": "Which competing ions and membrane conditions were included when selectivity was measured?", "kind": "measurement", "id": "coupling-and-selectivity-q03" } ] } ] }, { "id": "gradient-dependent-performance", "name": "Gradient-dependent performance", "description": "Connect activity to gradients, membranes, and exposure.", "findings": [ { "id": "transport-operating-context", "name": "Transport operating context", "description": "Make direction and extent of ion redistribution conditional on the actual test environment.", "questions": [ { "text": "What potassium concentrations and pH values occur on each membrane side before and after exposure?", "kind": "measurement", "id": "transport-operating-context-q01" }, { "text": "How do nigericin concentration, exposure time, temperature, and membrane composition affect the observed transport?", "kind": "measurement", "id": "transport-operating-context-q02" }, { "text": "What evidence shows that the intended gradient perturbation or pH equilibration was achieved?", "kind": "action", "id": "transport-operating-context-q03" } ] } ] } ] }, { "id": "research-response-interpretation", "name": "Research response interpretation", "description": "Connect nigericin exposure to observed responses without assigning unsupported pathway specificity.", "rationale": "An ionophore-induced phenotype does not by itself identify a direct molecular target or a particular cell-death pathway.", "layers": [ { "id": "experimental-role", "name": "Experimental role", "description": "Specify the purpose and context of nigericin use.", "findings": [ { "id": "context-qualified-response", "name": "Context-qualified response", "description": "Keep ion-gradient manipulation, pH calibration, antimicrobial testing, and cellular stimulation distinguishable.", "questions": [ { "text": "What role is nigericin intended to serve in this experiment, and what observable result defines success?", "kind": "definition", "id": "context-qualified-response-q01" }, { "text": "Which cell or membrane system, priming state, medium, concentration, and duration qualify the response?", "kind": "measurement", "id": "context-qualified-response-q02" } ] } ] }, { "id": "causal-and-assay-limits", "name": "Causal and assay limits", "description": "Separate observed effects from conclusions requiring additional controls.", "findings": [ { "id": "response-attribution", "name": "Response attribution", "description": "Require controls that distinguish ion redistribution, pathway activation, and general loss of viability.", "questions": [ { "text": "Which controls distinguish the intended response from vehicle effects, nonspecific toxicity, and assay interference?", "kind": "measurement", "id": "response-attribution-q01" }, { "text": "What evidence distinguishes NLRP3 involvement from NLRP1 involvement or inflammasome-independent responses in this system?", "kind": "boundary", "id": "response-attribution-q02" }, { "text": "Which conclusions remain unsupported even if the nigericin positive control produces a signal?", "kind": "boundary", "id": "response-attribution-q03" } ] } ] } ] }, { "id": "handling-and-use-constraints", "name": "Handling and use constraints", "description": "Bind handling decisions to the identified nigericin material and applicable documentation.", "rationale": "An active research reagent needs form- and formulation-specific hazard evidence before handling requirements can be assigned.", "layers": [ { "id": "hazard-evidence", "name": "Hazard evidence", "description": "Establish the documented hazards and unresolved safety information.", "findings": [ { "id": "form-specific-classification", "name": "Form-specific classification", "description": "Record applicable classifications without assuming that all nigericin products have identical documentation.", "questions": [ { "text": "Which current SDS applies to the exact free acid, salt, or solution being handled?", "kind": "provenance", "id": "form-specific-classification-q01" }, { "text": "What GHS classifications and exposure routes does that document identify, under which jurisdiction?", "kind": "definition", "id": "form-specific-classification-q02" }, { "text": "Are substance-specific exposure limits documented, or is their status unresolved?", "kind": "provenance", "id": "form-specific-classification-q03" } ] } ] }, { "id": "permitted-material-actions", "name": "Permitted material actions", "description": "Translate verified documentation into decisions for the intended research setting.", "findings": [ { "id": "handling-disposition", "name": "Handling disposition", "description": "Determine applicable storage, exposure-control, spill, and waste requirements.", "questions": [ { "text": "Which documented controls apply to weighing the solid versus handling a nigericin solution?", "kind": "action", "id": "handling-disposition-q01" }, { "text": "What storage, spill-response, and disposal requirements apply to this material and its solvent?", "kind": "action", "id": "handling-disposition-q02" }, { "text": "What evidence establishes that the proposed use is permitted in the relevant facility and jurisdiction?", "kind": "provenance", "id": "handling-disposition-q03" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-confidence-notes", "name": "Check these first", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "This is recalled knowledge, without source consultation.", "Verify registry identifiers, purity, hydration or solvation state, and hazard classification for the exact material supplied.", "Melting point, exposure limits and jurisdiction-specific regulatory status are omitted because they are not confidently recalled." ], "questions": [ { "id": "evidence-confidence-notes-q01", "text": "Which of these check these first hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-kinds", "name": "Kinds and varieties", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Nigericin free acid", "Nigericin sodium salt" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "scheme": "Molecular formula", "value_or_pattern": "C40H68O11", "note": "Applies to the free acid; the sodium salt has a different formula." }, { "scheme": "CAS Registry Number", "value_or_pattern": "Digits in three hyphen-separated groups, with two digits in the middle group and a final check digit", "note": "Verify the specific registry number against the free acid or salt supplied." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Experimental manipulation of potassium and proton gradients across membranes.", "Calibration of intracellular pH indicators under controlled high-potassium conditions.", "Experimental activation of the NLRP3 inflammasome in appropriately primed cells.", "Research on mitochondrial function and membrane bioenergetics." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "quantity": "Molar mass of the free acid", "typical_range": "Approximately 724.97", "unit": "g/mol" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Disruption of cellular ion gradients can cause cytotoxicity and cell death.", "Perturbation of mitochondrial gradients can impair energy metabolism.", "Experimental responses depend on extracellular potassium, pH, cell type, exposure duration and concentration.", "Poor aqueous solubility can complicate preparation and dosing.", "Confusing the free acid with a salt can produce errors in calculated molar concentration." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "name": "Monensin", "difference": "Another polyether ionophore, but generally associated with sodium/proton exchange rather than nigericin's preference for potassium/proton exchange." }, { "name": "Valinomycin", "difference": "A potassium-selective carrier that transports potassium electrogenically, whereas nigericin couples potassium transport to proton countertransport." }, { "name": "Nigericin sodium salt", "difference": "A salt form of the same parent compound, distinguished from the free acid by its counterion, molecular formula and molar mass." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of nigericin this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Which CAS and EC identifiers unambiguously map to the free acid and each supplied salt, and which historical synonyms denote exactly the same stereochemical entity?", "Which measured solubility, thermal, and storage-stability values are reliable for each material form, and are any reported boiling values experimentally supported?", "What minimum analytical and functional evidence is sufficient to accept a lot, particularly when its certificate reports only chromatographic area purity?", "Under which membrane and ionic conditions does nigericin transport competing ions, and how do those conditions limit potassium-selective or pH-clamping interpretations?", "Which current hazard classifications, exposure limits, and use restrictions apply to the exact preparation in the intended jurisdiction?" ], "statistics": { "bundles": 7, "layers": 13, "findings": 19, "questions": 40 } }