nucleolus

nucleolus
An RNA-rich nuclear organelle in the nucleus of eukaryotic cells, produced by a nucleolar organizer. It represents the storage place for ribosomes and ribosome precursors. The nucleolus consists primarily of ribosomal precursor RNA, ribosomal RNA, their associated proteins, and some, perhaps all, of the enzymatic equipment (RNA polymerase, RNA methylase, RNA cleavage enzymes) required for synthesis, conversion and assembly of ribosomes. Subsequently the ribosomes are transported to the cytoplasm.

Glossary of Biotechnology for Food and Agriculture . 2015.

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  • Nucleolus — (Plur. Nucleoli), Kernkörperchen, im Karyoplasma des Zellkerns liegender, dichter Bezirk, meist doppelt, zellspezifisch aber auch einfach oder mehrfach vorhanden; enthält ca. 80% Proteine (keine Histone), DNA und RNA; synthetisiert und speichert… …   Deutsch wörterbuch der biologie

  • nucleolus — (n.) 1845, from L. nucleolus, lit. a little nut, dim. of nucleus (see NUCLEUS (Cf. nucleus)) …   Etymology dictionary

  • Nucleolus — Nu*cle o*lus, n.; pl. {Nucleoli}. [L., a little nut, dim. of nucleus.] 1. A little nucleus. [1913 Webster] 2. (Biol.) A small rounded body contained in the nucleus of a cell or a protozoan. [1913 Webster] Note: It was termed by Agassiz the… …   The Collaborative International Dictionary of English

  • nucleolus — nucleolus. См. ядрышко. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Nucleŏlus — Nucleŏlus, Kernkörper, s. Zelle …   Meyers Großes Konversations-Lexikon

  • Nucleolus — vgl. Nukleolus …   Das Wörterbuch medizinischer Fachausdrücke

  • nucleolus — [no͞o′klē ōl΄, nyo͞o′klē ōl΄no͞o klē′ə ləs, nyo͞oklē′ə ləs] n. pl. nucleoli [no͞o klē′əlī΄, nyo͞oklē′əlī΄] [ModL < LL, dim. of L nucleus] a conspicuous, usually spherical, dense body in the nucleus of most cells, consisting of protein and RNA …   English World dictionary

  • Nucleolus — The nucleolus is contained within the cell nucleus …   Wikipedia

  • Nucleolus — Übergeordnet Zellkern Karyoplasma Untergeordnet Ribosomale DNA Pars granulo …   Deutsch Wikipedia

  • nucleolus — 1. A small rounded mass within the cell nucleus where ribonucleoprotein is produced; it is usually single, but there may be several accessory nucleoli besides the principal one. The n. is composed of a meshwork (nucleolonema) of microfilaments… …   Medical dictionary

  • nucleolus — noun (plural nucleoli) Etymology: New Latin, from Latin, diminutive of nucleus Date: 1845 a spherical body of the nucleus of most eukaryotes that becomes enlarged during protein synthesis, is associated with a nucleolus organizer, and contains… …   New Collegiate Dictionary

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