Luria–Delbrück experiment

E160513

bacterial genetics experiment fluctuation test scientific experiment

The Luria–Delbrück experiment was a landmark 1943 study in bacterial genetics that demonstrated mutations arise randomly rather than in response to selective pressure, providing key evidence for the genetic basis of evolution.

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All labels observed (2)

Label	Occurrences
Luria–Delbrück experiment canonical	3
Luria–Delbrück fluctuation test	1

Statements (47)

Predicate	Object
instanceOf	bacterial genetics experiment ⓘ fluctuation test ⓘ scientific experiment ⓘ
analyzed	distribution of resistant colonies across cultures ⓘ
contrastedWith	Poisson distribution expected for induced mutations ⓘ
countryOfOrigin	United States of America ⓘ surface form: United States
dataCharacteristic	jackpot events of early mutations ⓘ
demonstrated	mutations are not induced by selective pressure ⓘ mutations arise randomly ⓘ pre‑adaptive mutations ⓘ
field	bacterial genetics ⓘ evolutionary biology ⓘ microbiology ⓘ
hasAlternativeName	Luria–Delbrück experiment ⓘ surface form: Luria–Delbrück fluctuation test fluctuation test ⓘ
hasAuthor	Max Delbrück ⓘ Salvador Luria ⓘ
hasImpactOn	antibiotic resistance studies ⓘ cancer mutation models ⓘ
influenced	modern microbial genetics ⓘ population genetics of mutation ⓘ
keyConcept	bacteriophage resistance ⓘ mutation rate estimation ⓘ spontaneous mutation ⓘ
mainSubject	bacterial mutation ⓘ evolution ⓘ random mutation ⓘ
measured	number of phage‑resistant mutants per culture ⓘ
providedEvidenceFor	Darwinian evolution ⓘ genetic basis of evolution ⓘ
publicationYear	1943 ⓘ
publishedIn	Genetics ⓘ
recognizedAs	classic experiment in genetics ⓘ landmark in molecular biology ⓘ
refuted	Lamarckian inheritance in bacteria ⓘ
relatedConcept	Darwinism ⓘ surface form: Darwinian selection Lamarckism ⓘ surface form: Lamarckian adaptation mutation-selection theory ⓘ
relatedTo	Salvador Luria Nobel Prize in Physiology or Medicine 1969 ⓘ
showed	high variance in number of resistant colonies ⓘ
supportsView	mutations occur before exposure to selective agent ⓘ
testedOrganism	Escherichia coli ⓘ bacteriophage T1 ⓘ
timePeriod	World War II era ⓘ
usedControl	multiple independent bacterial cultures ⓘ
usedMethod	fluctuation analysis ⓘ statistical distribution of mutants ⓘ

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: Luria–Delbrück experiment
Description of subject: The Luria–Delbrück experiment was a landmark 1943 study in bacterial genetics that demonstrated mutations arise randomly rather than in response to selective pressure, providing key evidence for the genetic basis of evolution.

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

Max Delbrück → knownFor → Luria–Delbrück experiment ⓘ

Salvador Luria → notableWork → Luria–Delbrück experiment ⓘ

Luria–Delbrück experiment → hasAlternativeName → Luria–Delbrück experiment ⓘ

this entity surface form: Luria–Delbrück fluctuation test

Salvatore → notableWork → Luria–Delbrück experiment ⓘ

subject surface form: Salvatore Luria