identifier: METPO:1007088
label: urease negative
definition: Test-outcome phenotype where the urease test yields a negative result.
  The underlying enzyme-organism relation should additionally be asserted via <organism>
  METPO:2000303 'does not show activity of' GO:0009039 'urease activity'.
trait_category: OTHER
term_kind: CLASS
mapping_status: SEEDED
parent_traits:
- METPO:1007082
synonyms:
- synonym_text: urease -
  synonym_type: EXACT_SYNONYM
  source: metpo.owl
- synonym_text: urease test negative
  synonym_type: EXACT_SYNONYM
  source: metpo.owl
created_by: Marcin Joachimiak
curation_history:
- timestamp: '2026-09-11T15:40:34Z'
  curator: seed_from_metpo
  action: SEEDED_FROM_METPO
  changes: imported from data/raw/metpo.owl (CLASS)
- timestamp: '2026-09-11T15:41:02Z'
  curator: codex
  action: ENRICHED_FROM_LITERATURE
  changes: Enriched the seeded METPO urease-negative test outcome with OMP definition
    provenance plus DOI-backed assay evidence after a repository-wide duplicate review
    covering ignored and hidden files.
  llm_assisted: true
definition_source: http://purl.obolibrary.org/obo/OMP_0006090
evidence:
- reference: DOI:10.5812/chbs-160199
  snippet: A positive reaction is indicated by the entire liquid medium and the surface
    of the solid medium turning pink, whereas a negative reaction is characterized
    by the medium remaining yellow
  notes: Hafezi and Khamar review the urease-test polarity and interpret an unchanged
    yellow medium as a negative assay result.
- reference: DOI:10.5812/chbs-160199
  snippet: Both types contain a phenol red reagent that changes color with pH variations
  notes: The review describes the pH-indicator readout shared by liquid and solid
    urease-test media.