Lambda

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Lambda (λ)

Lambda (pronounced /ˈlæmbdə/; uppercase Λ, lowercase λ) is the 11th letter of the Greek alphabet. In the system of Greek numerals, lambda has a value of 30. Lambda is derived from the Phoenician Lamed Lamedh.

In the medical field, lambda has several specific meanings:

1. Lambda sign: In radiology, the lambda sign is a triangular appearance on a sagittal plane MRI that is one of the classic signs of twin pregnancy.

2. Lambda phage: Lambda phage is a temperate bacteriophage that infects Escherichia coli (E. coli).

3. Lambda light chain: In immunology, lambda light chain is a type of light chain that constitutes part of an antibody molecule.

4. Lambda zone: In histology, the lambda zone is a region in the spleen where B cells, T cells, and macrophages are found.

Pronunciation

Lambda is pronounced as /ˈlæmbdə/.

Etymology

The term lambda comes from the Ancient Greek lambdā, the name of the letter Λ, λ in the Greek alphabet. The Greek letter is derived from the Phoenician letter lamedh.

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