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Nucleus (: nuclei) is a Latin word for the seed inside a fruit. It most often refers to: *
Atomic nucleus The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford at the Department_of_Physics_and_Astronomy,_University_of_Manchester , University of Manchester ...
, the very dense central region of an atom *
Cell nucleus The cell nucleus (; : nuclei) is a membrane-bound organelle found in eukaryote, eukaryotic cell (biology), cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have #Anucleated_cells, ...
, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucleus may also refer to:


Science, technology, and mathematics


Astronomy

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Active galactic nucleus An active galactic nucleus (AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. Such e ...
in astronomy *
Comet nucleus The nucleus is the solid, central part of a comet, formerly termed a ''dirty snowball'' or an ''icy dirtball''. A cometary nucleus is composed of rock, dust, and frozen gases. When heated by the Sun, the gases sublime and produce an atmosphe ...
, the solid, central part of a comet


Biology

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Cell nucleus The cell nucleus (; : nuclei) is a membrane-bound organelle found in eukaryote, eukaryotic cell (biology), cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have #Anucleated_cells, ...
, a central organelle of a eukaryotic cell, containing most of the cell's DNA *
Nucleus (neuroanatomy) In neuroanatomy, a nucleus (: nuclei) is a cluster of neurons in the central nervous system, located deep within the cerebral hemispheres and brainstem. The neurons in one nucleus usually have roughly similar connections and functions. Nuclei are c ...
, a cluster of cell bodies of neurons in the central nervous system *Nucleus that forms in the eye in nuclear sclerosis (early cataracts) *''Nucleus'', a scientific journal concerned with the cell nucleus; published by
Taylor & Francis Taylor & Francis Group is an international company originating in the United Kingdom that publishes books and academic journals. Its parts include Taylor & Francis, CRC Press, Routledge, F1000 (publisher), F1000 Research and Dovepress. It i ...
* Nucleus, a small colony of honeybees, induced to raise a new queen by the beekeeper


Computer systems

* Nucleus (operating system), sometimes a synonym for kernel * Nucleus CMS, a weblog system *
Nucleus RTOS Nucleus RTOS is a real-time operating system (RTOS) produced by the Embedded Software Division of Mentor Graphics, a Siemens Business, supporting 32-bit computing, 32- and 64-bit computing, 64-bit embedded system platforms. The operating system (O ...
, a real-time operating system (RTOS) * Nucleus, part of an operating system loaded by an
Initial Program Load In computing, booting is the process of starting a computer as initiated via hardware such as a physical button on the computer or by a software command. After it is switched on, a computer's central processing unit (CPU) has no software in ...
or boot loader


Mathematics

* Nucleus (algebra), the elements of a ring that associate with all others * Nucleus (order theory), a mathematical term


Other sciences

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Nucleus (syllable) A syllable is a basic unit of organization within a sequence of speech sounds, such as within a word, typically defined by linguists as a ''nucleus'' (most often a vowel) with optional sounds before or after that nucleus (''margins'', which are ...
, in linguistics, the central part of a syllable *
Atomic nucleus The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford at the Department_of_Physics_and_Astronomy,_University_of_Manchester , University of Manchester ...
, the very dense central region of an atom * Condensation nucleus, the seed of a raindrop ** Ice nucleus, the seed of a snowflake


Arts and media

* Nucleus (band), a jazz-rock band from Britain * ''Nucleus'' (video game), a 2007 downloadable game on the PlayStation Store * ''Nucleus'' (Anekdoten album), 1995 * ''Nucleus'' (Deeds of Flesh album), 2020 * ''Nucleus'' (Sonny Rollins album), 1975 * Nucleus, predecessor to Canadian rock band A Foot in Coldwater * ''Nucleus'', a scientific journal concerned with the cell nucleus; published by
Taylor & Francis Taylor & Francis Group is an international company originating in the United Kingdom that publishes books and academic journals. Its parts include Taylor & Francis, CRC Press, Routledge, F1000 (publisher), F1000 Research and Dovepress. It i ...


Other uses

* Nucleus (advocacy group), a UK-European political advocacy campaign organisation * Nucleus Limited, an Australian medical research company, taken over by Pacific Dunlop in 1988 * nuCLEus, a proposed 54-story mixed use building in Cleveland, Ohio, US * Nucleus, the Nuclear and Caithness Archives, a British national archive


See also

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Nuclear (disambiguation) Nuclear may refer to: Physics Relating to the nucleus of the atom: *Nuclear engineering *Nuclear physics *Nuclear power *Nuclear reactor *Nuclear weapon *Nuclear medicine *Radiation therapy *Nuclear warfare Mathematics * Nuclear space *Nuclear ...
*
Nucleation In thermodynamics, nucleation is the first step in the formation of either a new Phase (matter), thermodynamic phase or Crystal structure, structure via self-assembly or self-organization within a substance or mixture. Nucleation is typically def ...
*
Nucleic acid Nucleic acids are large biomolecules that are crucial in all cells and viruses. They are composed of nucleotides, which are the monomer components: a pentose, 5-carbon sugar, a phosphate group and a nitrogenous base. The two main classes of nuclei ...
*
Nucleolus The nucleolus (; : nucleoli ) is the largest structure in the cell nucleus, nucleus of eukaryote, eukaryotic cell (biology), cells. It is best known as the site of ribosome biogenesis. The nucleolus also participates in the formation of signa ...
*
Core (disambiguation) Core or cores may refer to: Science and technology * Core (anatomy), everything except the appendages * Core (laboratory), a highly specialized shared research resource * Core (manufacturing), used in casting and molding * Core (optical fiber), ...
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