nitrogen-15
E368992
Nitrogen-15 is a stable, naturally occurring isotope of nitrogen widely used as a tracer in nuclear, chemical, and biological studies.
All labels observed (1)
| Label | Occurrences |
|---|---|
| nitrogen-15 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3576657 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: nitrogen-15 Context triple: [Bethe–Weizsäcker cycle, involves, nitrogen-15]
-
A.
Niton
Niton is a coastal village on the southern tip of the Isle of Wight in England, known for its scenic cliffs and rural character.
-
B.
Niwt-Imn
Niwt-Imn is the ancient Egyptian name for the city later known as Thebes, a major religious and political center along the Nile.
-
C.
Phosphoros
Phosphoros is an epithet meaning “light-bringer,” associated with Hecate in her aspect as a luminous, guiding deity linked to the appearance of the morning star.
-
D.
Chamical
Chamical is a small city in central La Rioja Province, Argentina, known historically as a regional railway and agricultural center.
-
E.
Zinin
Zinin is a Russian surname most notably associated with chemist Nikolai Zinin, a pioneer in organic chemistry.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: nitrogen-15 Target entity description: Nitrogen-15 is a stable, naturally occurring isotope of nitrogen widely used as a tracer in nuclear, chemical, and biological studies.
-
A.
Niton
Niton is a coastal village on the southern tip of the Isle of Wight in England, known for its scenic cliffs and rural character.
-
B.
Niwt-Imn
Niwt-Imn is the ancient Egyptian name for the city later known as Thebes, a major religious and political center along the Nile.
-
C.
Phosphoros
Phosphoros is an epithet meaning “light-bringer,” associated with Hecate in her aspect as a luminous, guiding deity linked to the appearance of the morning star.
-
D.
Chamical
Chamical is a small city in central La Rioja Province, Argentina, known historically as a regional railway and agricultural center.
-
E.
Zinin
Zinin is a Russian surname most notably associated with chemist Nikolai Zinin, a pioneer in organic chemistry.
- F. None of above. chosen
Statements (60)
| Predicate | Object |
|---|---|
| instanceOf |
isotope
ⓘ
nitrogen isotope ⓘ stable isotope ⓘ |
| belongsTo | light stable isotopes ⓘ |
| betaDecay | not observed ⓘ |
| bindingEnergyPerNucleon | ≈7.48 MeV ⓘ |
| contrastWith | nitrogen-14 ⓘ |
| discoveredBy |
H. C. Urey
ⓘ
linked to:
Harold Urey
Hugh S. Taylor ⓘ |
| discoveryYear | 1929 ⓘ |
| element | nitrogen ⓘ |
| enrichedForm | 15N-enriched compounds ⓘ |
| halfLife | stable ⓘ |
| heavierThan | nitrogen-14 ⓘ |
| labelingType | stable isotope labeling ⓘ |
| massNumber | 15 ⓘ |
| naturalAbundance |
0.36%
ⓘ
0.37% ⓘ |
| naturalOccurrence | naturally occurring ⓘ |
| neutronNumber | 8 ⓘ |
| nuclearProperty |
NMR-active nucleus
ⓘ
quadrupoleMoment≈0 ⓘ |
| nuclearSpin | 1/2 ⓘ |
| parity | + ⓘ |
| protonNumber | 7 ⓘ |
| radioactive | false ⓘ |
| relativeAtomicMass | 15.000108898 ⓘ |
| standardAtomicWeightContribution | 15.000108898 ⓘ |
| symbol | 15N ⓘ |
| usedAs | stable isotope tracer ⓘ |
| usedFor |
measuring denitrification
ⓘ
measuring nitrification ⓘ measuring nitrogen fixation ⓘ studying protein turnover ⓘ studying trophic levels ⓘ tracing nitrogen transformations ⓘ |
| usedIn |
15N NMR spectroscopy
ⓘ
NMR spectroscopy ⓘ amino acid metabolism studies ⓘ biological studies ⓘ chemical studies ⓘ ecological studies ⓘ environmental tracing ⓘ fertilizer studies ⓘ food web analysis ⓘ forensic science ⓘ groundwater studies ⓘ isotope dilution analysis ⓘ mass spectrometry ⓘ metabolic flux analysis ⓘ metabolic labeling ⓘ nitrogen cycle studies ⓘ nuclear studies ⓘ paleodietary studies ⓘ plant nutrition studies ⓘ pollution source tracking ⓘ protein labeling ⓘ protein structure determination ⓘ soil nitrogen studies ⓘ stable isotope probing ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: nitrogen-15 Description of subject: Nitrogen-15 is a stable, naturally occurring isotope of nitrogen widely used as a tracer in nuclear, chemical, and biological studies.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.