companion cell

companion cell
noun Date: 1887 a living nucleated cell that is closely associated in origin, position, and probably function with a cell making up part of a sieve tube of a vascular plant

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • companion cell — noun : one of the elongated parenchyma cells lying next to and supposedly associated physiologically with the sieve tube in many seed plants, developing with the sieve tube from the same mother cell, sometimes extending the full length of the… …   Useful english dictionary

  • companion cell — Relatively small plant cell, with little or no vacuole, found adjacent to a phloem sieve tube and originating with the latter from a common mother cell. Thought to be involved in translocation of sugars in and out of the sieve tube …   Dictionary of molecular biology

  • companion cell — A living cell associated with the sieve cell of phloem tissue in vascular plants …   Glossary of Biotechnology

  • companion cell — a Sertoli or follicle cell enveloping the cysts of spermatogenic cells in the testis …   Dictionary of ichthyology

  • companion cell — /kəmˌpænjən ˈsɛl/ (say kuhm.panyuhn sel) noun Botany a cell associated with a sieve tube and, collectively, forming one of the elements of phloem …   Australian English dictionary

  • companion cell — Bot. any of a number of specialized parenchymal cells adjacent to a sieve tube in the phloem of flowering plants, believed to regulate the flow of nutrients through the tube. [1885 90] * * * …   Universalium

  • cell of Hensen — cell of Hen·sen hen(t) sən n one of the supporting columnar cells between the outer hair cells and the cells of Claudius in the organ of Corti Hensen Viktor (1835 1924) German physiologist and marine biologist. Hensen did basic research on the… …   Medical dictionary

  • Companion Animal Parasite Council — The Companion Animal Parasite Council (also commonly referred to as CAPC, pronounced Cap C , is a non profit organization (501c3) composed of practicing veterinarians, academic veterinary parasitologists, veterinary technicians, state public… …   Wikipedia

  • Plant cell — Plant cells are eukaryotic cells that differ in several key respects from the cells of other eukaryotic organisms. Their distinctive features include: * A large central vacuole, a sap filled volume enclosed by a membrane known as the tonoplast JA …   Wikipedia

  • Transfer cell — Transfer cells are specialized companion cells that have an increased surface area, due to infoldings of the plasma membrane. They facilitate the transport of sugars from a sugar source, mainly leafs, to a sugar sink, often developing fruits …   Wikipedia

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