Intercalation

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Intercalation may refer to:

• The insertion of a leap day, week or month into some calendar years to make the calendar follow the seasons.

• Chemistry, where intercalation is the insertion of a molecule (or group) between two other molecules (or groups). For example, 2,4 dichlorophenoxyacetic acid or 2-(2,4 dichlorophenoxy-)propionic acid intercalates between layers of clays.

• In literature, a technique used to insert one narrative inside another, implying simultaneity. It is also called a "hybrid story" and is used often in the Gospel of Mark, for example in the narrative of the daughter of Jairus.

• University administration, where intercalation is the period when a student is officially suspended from studying for an academic degree.

• By very broad metaphor, intercalation is also used to describe the insertion of a (usually pithy) comment about an email or Usenet message into some structural part (like a signature) where message content would not normally go.

• In biology:
  • Intercalation can refer to how certain drugs and mutagen bind to DNA. This type of intercalation was discovered by Leonard Lerman.
  • Intercalated duct of exocrine glands
  • Intercalated disc of cardiac muscle
  • Intercalated cells of the collecting duct
  • Intercalated cells of the amygdala

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