COS

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Related to cosine: Cosine law, Cosine rule, Direction cosine, Hyperbolic cosine

COS

Abbreviation for Chief of Staff.

COS

Canadian Ophthalmological Society.

cos

site the region formed when the COHESIVE ENDS of certain BACTERIOPHAGES, notably bacteriophage lambda, join together. A cos site is formed when the linear CHROMOSOME of bacteriophage lambda circularizes following infection of a host cell. Concatemeric (see CONCATEMER lambda DNA is cut at cos sites when the DNA is packaged during phage assembly in the LYTIC CYCLE.