{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T09:15:54Z", "providers": [ "Codex" ], "breadth": "recalled by Codex without web access - no source was read", "missingProviders": [], "pass": 2, "cost": { "grok": { "seconds": 18.2, "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: 01a094e5-5005-7de2-8d4f-5685e4ab3d14\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: dithioerythritol\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 043: 100", "usd": 0.0, "recall": true }, "codex": { "seconds": 103.2, "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: 01a094e5-4ffb-7d50-a40a-cf6c5a895c27\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: dithioerythritol\nRegistry id: vr.tr.dithioerythritol\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry:" } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T12:00:00Z", "ingestedAt": "2026-10-06T08:50:16+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "standards_and_regulation", "visual_identification" ] }, "gate": { "passed": true, "version": "1.0", "at": "2026-10-07T10:10:30+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q412701", "registryId": "vr.tr.dithioerythritol", "name": "dithioerythritol", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q412701/", "model": { "registry_id": "vr.tr.dithioerythritol", "name": "dithioerythritol", "purpose": "Enable an agent to identify dithioerythritol, assess its remaining reducing capacity and material quality, and judge its suitability for a specified laboratory use.", "definition": "Dithioerythritol (DTE) is the meso stereoisomer of 1,4-dimercaptobutane-2,3-diol, a small organic dithiol used to reduce disulfide bonds and maintain thiol groups in their reduced state.", "scope_statement": "This model owns the substance identity and use-relevant material states of dithioerythritol (DTE), registered as vr.tr.dithioerythritol in PHY / PHY.MAT, including stereochemistry, purity, oxidation, solution conditions and handling constraints.", "in_scope": [ "DTE molecular identity, stereochemical identity and identifier reconciliation", "Material grade, analytical purity, disulfide impurities and active thiol content", "Solid and dissolved states, concentration and condition-dependent physical properties", "Disulfide-reduction capability and protection of sulfhydryl groups", "Storage history, solution ageing and evidence of remaining activity", "DTE-specific hazard evidence and jurisdiction-dependent handling requirements" ], "out_of_scope": [ "Dithiothreitol and other reducing agents as independently modelled substances", "Complete formulations, reagent kits and commercial product catalogues", "Protein, enzyme or nucleic-acid systems treated with DTE", "Complete synthesis, purification and experimental protocols", "Independent substance models for DTE oxidation products", "Laboratory equipment, facility controls and waste-management systems" ], "distinguishing_features": [ "Require erythro stereochemistry: DTE is represented as (2R,3S)-1,4-disulfanylbutane-2,3-diol, rather than identifying it from its formula alone. [Thermo Fisher DTE identity](https://www.thermofisher.com/order/catalog/product/de/de/A10138.14)", "Match CAS 6892-68-8 and EC 229-998-8; distinguish DTT, which shares the molecular formula but has CAS 3483-12-3. [Manufacturer biochemical catalogue](https://documents.thermofisher.com/TFS-Assets/LCD/brochures/alfa-aesar-biochemicals-brochure.pdf)", "Check for two terminal sulfhydryl groups and two internal hydroxyl groups; the formula C4H10O2S2 distinguishes DTE from erythritol but does not distinguish it from DTT. [Manufacturer biochemical catalogue](https://documents.thermofisher.com/TFS-Assets/LCD/brochures/alfa-aesar-biochemicals-brochure.pdf)", "Use melting behaviour as corroboration: the manufacturer catalogue lists 82-84 °C for DTE and 40-43 °C for DTT; material condition and test method must accompany a comparison. [Manufacturer biochemical catalogue](https://documents.thermofisher.com/TFS-Assets/LCD/brochures/alfa-aesar-biochemicals-brochure.pdf)", "Distinguish an active DTE preparation from an oxidized or depleted preparation through thiol or reducing-capacity measurements, rather than accepting the bottle label as evidence of current activity." ], "characteristics": [ { "name": "Stereochemical identity", "kind": "category", "unit_or_values": "Erythro DTE; stereochemically verified, unresolved or conflicting", "why_it_matters": "Prevents substitution of DTT or an unspecified stereoisomer mixture." }, { "name": "Chemical identifier agreement", "kind": "relation", "unit_or_values": "Registry id linked to CAS, EC, PubChem and stereochemical structure records", "why_it_matters": "Makes supplier and reference records comparable without treating shared abbreviations as sufficient identification." }, { "name": "DTE assay", "kind": "measurement", "unit_or_values": "% with analytical method and wet, dry or as-received basis", "why_it_matters": "Distinguishes nominal product grade from measured material composition." }, { "name": "Free sulfhydryl content", "kind": "measurement", "unit_or_values": "mmol SH/g or mmol SH/L, with assay method", "why_it_matters": "Helps assess activity while requiring correction for other thiol-containing substances." }, { "name": "Oxidized disulfide content", "kind": "measurement", "unit_or_values": "% or molar fraction, with identified species and method", "why_it_matters": "Records degradation separately from unrelated impurities." }, { "name": "Material form and dissolution state", "kind": "state", "unit_or_values": "Crystalline solid, powder, dissolved material or material with undissolved solids; temperature and solvent recorded", "why_it_matters": "Determines whether weighing and solution-concentration assumptions are valid." }, { "name": "DTE concentration", "kind": "measurement", "unit_or_values": "mmol/L or g/L; nominal and analytically verified values distinguished", "why_it_matters": "Supports dose calculations without equating total weighed reagent with active DTE." }, { "name": "Solution pH", "kind": "measurement", "unit_or_values": "pH with temperature, buffer and measurement time", "why_it_matters": "Provides necessary context for comparing reduction performance and stability." }, { "name": "Thermal behaviour", "kind": "measurement", "unit_or_values": "Melting range and decomposition observations in °C; pressure for any boiling-point claim", "why_it_matters": "Supports identity checks without confusing decomposition or supplier acceptance ranges with universal constants." }, { "name": "Storage and exposure history", "kind": "state", "unit_or_values": "Temperature history, time since dissolution, atmosphere, opening events and freeze-thaw count", "why_it_matters": "Provides evidence for investigating loss of reducing capacity." }, { "name": "Application compatibility", "kind": "relation", "unit_or_values": "Validated, conditional, incompatible or untested for a named substrate and downstream assay", "why_it_matters": "Separates successful reduction from suitability for the complete intended workflow." }, { "name": "Hazard classification provenance", "kind": "relation", "unit_or_values": "Classification linked to supplier, material form, jurisdiction and SDS revision", "why_it_matters": "Prevents applying an unqualified hazard label across different preparations and jurisdictions." } ], "affordances": [ "Verify that a labelled reagent is DTE rather than DTT or an unspecified dithiol.", "Calculate a preparation amount using the verified identity, assay basis and target concentration.", "Assess whether a stored solid or solution retains sufficient reducing capacity.", "Evaluate DTE for reducing specified disulfides or maintaining specified sulfhydryl groups.", "Identify whether residual DTE requires removal before a downstream assay or reaction.", "Select documented storage, handling and disposition actions for the actual preparation." ], "agent_conduct": { "may": [ "Read labels and safety data sheets and report hazards and storage needs.", "Track stock in an authorized laboratory inventory with date of opening." ], "must_not": [ "Handle it without the protective equipment its safety data sheet requires.", "Discharge it to drains or the environment.", "Store it unsealed or in unmarked containers." ], "requires_human": [ "Disposing of expired or contaminated reagent." ] }, "ethics": { "considerations": [ "Laboratory staff bear the risk of poor chemical handling.", "Research reliability depends on reagents that are what they claim to be." ], "affected_parties": [ "Laboratory staff", "Waste handlers" ] }, "owners": { "steward": "The laboratory that holds it; its safety officer answers for storage.", "master_systems": [] }, "visual_identification": [ "A white crystalline solid with a sulfurous odour.", "Identity is confirmed by the label and analysis." ], "failure_modes_and_hazards": [ "Harmful if swallowed and irritating to skin and eyes.", "Oxidizes in air, so old stock can fail to work." ], "standards_and_regulation": [ "Globally Harmonized System of Classification and Labelling of Chemicals, United Nations." ], "what_it_is_for": [ "Dithioerythritol is encountered in biochemical laboratories as a reagent for reducing protein disulfide bonds and maintaining reduced thiol groups.", "It is used during protein preparation and analysis when the method permits reducing conditions and the reagent's remaining activity is adequate." ] }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q412701: dithioerythritol", "url": "https://www.wikidata.org/wiki/Q412701", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: Dithioerythritol", "url": "https://en.wikipedia.org/wiki/Dithioerythritol", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "dte-identity-and-stereochemistry", "name": "DTE identity and stereochemistry", "description": "Establish which chemical entity the DTE name denotes and resolve its closest identity confusions.", "rationale": "DTE and DTT share a molecular formula and reducing-agent role, so identity requires stereochemical evidence.", "layers": [ { "id": "molecular-identity", "name": "Molecular identity", "description": "Connect the registered thing to an explicit stereochemical structure.", "findings": [ { "id": "erythro-structure-verification", "name": "Erythro structure verification", "description": "Require a structure representation that preserves the distinction between erythro DTE and threo DTT.", "questions": [ { "text": "Which stereochemical structure and analytical evidence establish that the material is erythro DTE?", "kind": "definition", "id": "erythro-structure-verification-q01" }, { "text": "Does the identity evidence distinguish DTE from DTT, or establish only their shared composition?", "kind": "boundary", "id": "erythro-structure-verification-q02" } ] } ] }, { "id": "identifier-and-name-resolution", "name": "Identifier and name resolution", "description": "Reconcile chemical identifiers and potentially ambiguous reagent names.", "findings": [ { "id": "dte-reference-record-agreement", "name": "DTE reference record agreement", "description": "Keep chemical identity separate from supplier stock numbers and ambiguous Cleland reagent terminology.", "questions": [ { "text": "Which CAS, EC, PubChem and structure records agree on the entity represented by vr.tr.dithioerythritol?", "kind": "provenance", "id": "dte-reference-record-agreement-q01" }, { "text": "When a record says DTE or Cleland's reagent, what additional evidence excludes DTT?", "kind": "boundary", "id": "dte-reference-record-agreement-q02" } ] } ] } ] }, { "id": "dte-composition-and-active-content", "name": "DTE composition and active content", "description": "Describe the difference between labelled purity, chemical composition and usable reducing material.", "rationale": "A high nominal purity does not by itself establish stereochemical purity or present reducing capacity.", "layers": [ { "id": "grade-and-assay", "name": "Grade and assay", "description": "Interpret lot-specific quality evidence for the intended use.", "findings": [ { "id": "assay-basis-and-selectivity", "name": "Assay basis and selectivity", "description": "Identify what the reported DTE assay actually measures and which impurities it can miss.", "questions": [ { "text": "Which method and reporting basis support the lot's stated DTE purity?", "kind": "measurement", "id": "assay-basis-and-selectivity-q01" }, { "text": "Can that method distinguish DTE from DTT, water and other reducing contaminants?", "kind": "measurement", "id": "assay-basis-and-selectivity-q02" } ] } ] }, { "id": "thiol-and-disulfide-balance", "name": "Thiol and disulfide balance", "description": "Assess active sulfhydryl content alongside oxidation products.", "findings": [ { "id": "remaining-reductant-assessment", "name": "Remaining reductant assessment", "description": "Treat measured activity and oxidized material as separate evidence. One supplier explicitly specifies disulfide impurity content for its DTE product. [Merck DTE specifications](https://www.sigmaaldrich.com/GB/en/product/mm/233152)", "questions": [ { "text": "What free-thiol content and reducing capacity remain at the time of use?", "kind": "measurement", "id": "remaining-reductant-assessment-q01" }, { "text": "Which oxidation products or other thiols could bias the activity measurement?", "kind": "measurement", "id": "remaining-reductant-assessment-q02" }, { "text": "What application-specific result requires acceptance, retesting or rejection?", "kind": "action", "id": "remaining-reductant-assessment-q03" } ] } ] } ] }, { "id": "dte-physical-state-and-solutions", "name": "DTE physical state and solutions", "description": "Represent material form and preparation conditions without treating product specifications as universal constants.", "rationale": "DTE concentration and physical-property evidence become unreliable when solvent, temperature, assay basis or dissolution state is omitted.", "layers": [ { "id": "solid-state-and-thermal-evidence", "name": "Solid state and thermal evidence", "description": "Use physical observations to support material recognition and assess anomalous samples.", "findings": [ { "id": "thermal-identity-corroboration", "name": "Thermal identity corroboration", "description": "Compare observed melting behaviour with an appropriate reference while recording decomposition and test conditions.", "questions": [ { "text": "What melting interval was measured, by which method and on material of what purity?", "kind": "measurement", "id": "thermal-identity-corroboration-q01" }, { "text": "Does an anomalous thermal result indicate contamination, identity mismatch or decomposition?", "kind": "boundary", "id": "thermal-identity-corroboration-q02" } ] } ] }, { "id": "solution-composition", "name": "Solution composition", "description": "Define how much DTE is dissolved and under which conditions.", "findings": [ { "id": "dissolved-dose-verification", "name": "Dissolved dose verification", "description": "Separate nominal concentration, actual dissolved concentration and measured active concentration.", "questions": [ { "text": "What solvent, buffer, temperature and final volume define the DTE preparation?", "kind": "definition", "id": "dissolved-dose-verification-q01" }, { "text": "Was complete dissolution verified, and is the concentration corrected for the material's assay basis?", "kind": "measurement", "id": "dissolved-dose-verification-q02" }, { "text": "Does a reported solubility value represent saturation or merely a successfully tested concentration?", "kind": "provenance", "id": "dissolved-dose-verification-q03" } ] } ] } ] }, { "id": "dte-reduction-and-compatibility", "name": "DTE reduction and compatibility", "description": "Connect DTE activity to a specified target and its subsequent analytical or chemical use.", "rationale": "DTE is used to reduce disulfides and protect thiols, but suitability must be established for the actual system. [Thermo Fisher DTE applications](https://www.thermofisher.com/order/catalog/product/de/de/A10138.14)", "layers": [ { "id": "target-reduction", "name": "Target reduction", "description": "Define the intended sulfhydryl or disulfide outcome and its evidence.", "findings": [ { "id": "reduction-endpoint-and-conditions", "name": "Reduction endpoint and conditions", "description": "Require a target-specific endpoint rather than assuming that adding DTE proves successful reduction.", "questions": [ { "text": "Which disulfides must be reduced or which sulfhydryl groups must remain reduced?", "kind": "definition", "id": "reduction-endpoint-and-conditions-q01" }, { "text": "What DTE concentration, pH, temperature and contact time have demonstrated the required endpoint?", "kind": "measurement", "id": "reduction-endpoint-and-conditions-q02" }, { "text": "Which measurement distinguishes successful target reduction from excess reagent remaining in solution?", "kind": "measurement", "id": "reduction-endpoint-and-conditions-q03" } ] } ] }, { "id": "downstream-compatibility", "name": "Downstream compatibility", "description": "Assess whether DTE carryover or substitution affects the next operation.", "findings": [ { "id": "carryover-and-substitution-decision", "name": "Carryover and substitution decision", "description": "Investigate effects on thiol-reactive chemistry, redox-sensitive measurements and protocols originally validated with another reductant.", "questions": [ { "text": "Could residual DTE consume a downstream thiol-reactive reagent or contribute to the assay signal?", "kind": "boundary", "id": "carryover-and-substitution-decision-q01" }, { "text": "What evidence supports substituting DTE for DTT in this particular application?", "kind": "provenance", "id": "carryover-and-substitution-decision-q02" }, { "text": "What residual-DTE limit or removal step is required before proceeding?", "kind": "action", "id": "carryover-and-substitution-decision-q03" } ] } ] } ] }, { "id": "dte-storage-and-activity-retention", "name": "DTE storage and activity retention", "description": "Relate handling history to the evidence needed for continued use.", "rationale": "The supplier describes DTE as air-sensitive, making atmosphere and exposure history relevant to activity assessment. [Thermo Fisher DTE handling notes](https://www.thermofisher.com/order/catalog/product/de/de/A10138.14)", "layers": [ { "id": "solid-reagent-history", "name": "Solid reagent history", "description": "Track storage conditions and changes after opening.", "findings": [ { "id": "solid-storage-conformance", "name": "Solid storage conformance", "description": "Apply the actual material's documented storage conditions and record departures that warrant investigation.", "questions": [ { "text": "What temperature, closure and atmosphere requirements accompany this DTE lot?", "kind": "provenance", "id": "solid-storage-conformance-q01" }, { "text": "Which opening events or storage excursions occurred before the current assessment?", "kind": "provenance", "id": "solid-storage-conformance-q02" }, { "text": "What activity or composition check is needed after a documented excursion?", "kind": "action", "id": "solid-storage-conformance-q03" } ] } ] }, { "id": "solution-ageing", "name": "Solution ageing", "description": "Assess stock-solution lifetime using the preparation's actual conditions.", "findings": [ { "id": "stock-solution-validity", "name": "Stock solution validity", "description": "Keep storage claims conditional on the preparation. Merck provides aliquoting, freezing and inert-atmosphere instructions for its product's reconstituted solution. [Merck DTE preparation notes](https://www.sigmaaldrich.com/GB/en/product/mm/233152)", "questions": [ { "text": "When was the stock prepared, and what pH, temperature, atmosphere and freeze-thaw history has it experienced?", "kind": "provenance", "id": "stock-solution-validity-q01" }, { "text": "What measured activity supports the stock's proposed use-by time under those conditions?", "kind": "measurement", "id": "stock-solution-validity-q02" }, { "text": "Should the stock be used, retested or replaced for the intended reduction?", "kind": "action", "id": "stock-solution-validity-q03" } ] } ] } ] }, { "id": "dte-hazards-and-material-disposition", "name": "DTE hazards and material disposition", "description": "Connect chemical identity and preparation state to applicable safety evidence.", "rationale": "Handling decisions require the relevant DTE safety record and must account for whether the material is a solid, stock solution or spent mixture.", "layers": [ { "id": "hazard-evidence", "name": "Hazard evidence", "description": "Resolve classification and exposure information for the actual preparation.", "findings": [ { "id": "applicable-dte-safety-record", "name": "Applicable DTE safety record", "description": "Preserve the supplier, jurisdiction and revision behind each hazard claim, with missing information explicitly unresolved.", "questions": [ { "text": "Which current SDS matches this DTE product, concentration and jurisdiction?", "kind": "provenance", "id": "applicable-dte-safety-record-q01" }, { "text": "Which GHS classifications and incompatibilities apply to the material being handled?", "kind": "boundary", "id": "applicable-dte-safety-record-q02" }, { "text": "Is a substance-specific occupational exposure limit documented, or is no applicable value established in the consulted sources?", "kind": "provenance", "id": "applicable-dte-safety-record-q03" } ] } ] }, { "id": "handling-and-spent-material", "name": "Handling and spent material", "description": "Determine actions using the composition and condition of unused or spent DTE.", "findings": [ { "id": "preparation-specific-disposition", "name": "Preparation-specific disposition", "description": "Assess residual DTE, oxidation products, solvent and treated sample constituents before selecting handling or disposal actions.", "questions": [ { "text": "What controls follow from the applicable SDS for weighing solid DTE or transferring its solution?", "kind": "action", "id": "preparation-specific-disposition-q01" }, { "text": "What DTE activity and other constituents remain in the spent preparation?", "kind": "measurement", "id": "preparation-specific-disposition-q02" }, { "text": "Which documented waste route applies to that mixture in the operating jurisdiction?", "kind": "action", "id": "preparation-specific-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 description is recalled knowledge; no sources were consulted.", "Verify melting point, solubility, storage stability and application concentrations against material-specific documentation.", "Check the current supplier safety data sheet for hazard classification, handling requirements and jurisdiction-specific regulatory identifiers." ], "questions": [ { "id": "evidence-confidence-notes-q01", "text": "Which of these check these first hold for the sense of dithioerythritol 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": "CAS Registry Number", "value_or_pattern": "6892-68-8", "note": "Identifies dithioerythritol." }, { "scheme": "Molecular formula", "value_or_pattern": "C4H10O2S2", "note": "Shared with dithiothreitol; the formula alone does not distinguish stereoisomers." }, { "scheme": "Common biochemical abbreviation", "value_or_pattern": "DTE", "note": "An abbreviation rather than a globally unique identifier." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of dithioerythritol 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": [ "Reduction of disulfide bonds in proteins and other biochemical samples.", "Maintenance of reduced sulfhydryl groups during protein preparation and enzyme assays." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of dithioerythritol 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", "typical_range": "154.25", "unit": "g/mol" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of dithioerythritol 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": [ "Oxidation during storage or use consumes reducing capacity.", "Reducing activity depends on pH because thiolate formation governs thiol-disulfide exchange.", "Reduction of structural disulfide bonds can destabilize proteins or change their activity.", "Residual reagent can interfere with assays or reactions sensitive to thiols and reducing agents." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of dithioerythritol 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": "Dithiothreitol", "difference": "Has the same connectivity and molecular formula but a different stereochemical configuration; dithioerythritol is the meso form." }, { "name": "Erythritol", "difference": "Has terminal hydroxyl groups where dithioerythritol has terminal thiol groups." }, { "name": "2-Mercaptoethanol", "difference": "Contains one thiol group per molecule, whereas dithioerythritol contains two and can form an intramolecular disulfide upon oxidation." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of dithioerythritol this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Which primary measurements establish DTE-specific thiol pKa values, redox potential and reduction kinetics under relevant conditions, without borrowing DTT values?", "Which method best distinguishes DTE, DTT, oxidized DTE and other reducing contaminants while quantifying usable reducing capacity?", "What measured solubility and thermal data distinguish equilibrium properties from supplier test concentrations, acceptance ranges and decomposition observations?", "How do concentration, buffer, pH, oxygen exposure, temperature and freeze-thaw history affect DTE activity retention in commonly used preparations?", "Which current jurisdiction-specific hazard classifications and exposure limits apply, and what evidence explains differences between supplier safety records?" ], "statistics": { "bundles": 7, "layers": 13, "findings": 18, "questions": 38 } }