urease negative

METPO:1007088 · CLASS · SEEDED

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 evidence (2)

DOI:10.5812/chbs-160199
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

Hafezi and Khamar review the urease-test polarity and interpret an unchanged yellow medium as a negative assay result.
DOI:10.5812/chbs-160199
Both types contain a phenol red reagent that changes color with pH variations

The review describes the pH-indicator readout shared by liquid and solid urease-test media.

Provenance

Identifier source: METPO (2026-06-12)
Author: Marcin Joachimiak
Definition source: http://purl.obolibrary.org/obo/OMP_0006090

Parent traits (1)

urease test METPO:1007082

Synonyms (2)

urease - EXACT_SYNONYM · metpo.owl
urease test negative EXACT_SYNONYM · metpo.owl

kg-microbe context

No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.

Curation history

2026-09-11T15:40:34Z · SEEDED_FROM_METPO · seed_from_metpo
imported from data/raw/metpo.owl (CLASS)
2026-09-11T15:41:02Z · ENRICHED_FROM_LITERATURE · codex
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.