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 based on the 1909 Geiger–Marsden gold foil experiment. After the discovery of the neutron i ...

, the very dense central region of an atom *

Cell nucleus The cell nucleus (pl. nuclei; from Latin or , meaning ''kernel'' or ''seed'') is a membrane-bound organelle found in eukaryotic cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, h ...

, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucleus may also refer to:

Science, technology, and mathematics

Astronomy

Active galactic nucleus An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much-higher-than-normal luminosity over at least some portion of the electromagnetic spectrum with characteristics indicating that the luminosity is not pr ...

in astronomy *

Comet nucleus The nucleus is the solid, central part of a comet, once termed a ''dirty snowball'' or an ''icy dirtball''. A cometary nucleus is composed of Rock (geology), rock, dust, and frozen gases. When heated by the Sun, the gases Sublimation (physics), ...

, the solid, central part of a comet

Biology

, a central organelle of a eukaryotic cell, containing most of the cell's DNA *

Nucleus (neuroanatomy) In neuroanatomy, a nucleus (plural form: 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. N ...

, a cluster of cell bodies of neurons in the central nervous system *Nucleus that forms in the eye in

nuclear sclerosis Nuclear sclerosis is an age-related change in the density of the crystalline lens The lens, or crystalline lens, is a transparent biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. ...

(early cataracts) *''Nucleus'', a scientific journal concerned with the cell nucleus; published by

Taylor & Francis Taylor & Francis Group is an international company originating in England that publishes books and academic journals. Its parts include Taylor & Francis, Routledge, F1000 (publisher), F1000 Research or Dovepress. It is a division of Informa ...

Nucleus Nucleus ( : nuclei) is a Latin word for the seed inside a fruit. It most often refers to: *Atomic nucleus, the very dense central region of an atom *Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucle ...

, a small colony of honeybees, induced to raise a new queen by the beekeeper

Computer systems

Nucleus (operating system) The kernel is a computer program at the core of a computer's operating system and generally has complete control over everything in the system. It is the portion of the operating system code that is always resident in memory and facilitates in ...

, sometimes a synonym for kernel *

Nucleus CMS Nucleus CMS is an open-source blog management software package written in PHP, with a MySQL backend. It is used to manage frequently-updated Web content. With a little tweaking (mainly to skins), it might be considered a lightweight content manage ...

, 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- and 64-bit embedded system platforms. The operating system (OS) is designed for real-time embedd ...

, 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 button or by a software command. After it is switched on, a computer's central processing unit (CPU) has no software in its main memory, so so ...

or boot loader

Mathematics

Nucleus (algebra) In abstract algebra, the term associator is used in different ways as a measure of the non-associativity of an algebraic structure. Associators are commonly studied as triple systems. Ring theory For a non-associative ring or algebra R, the asso ...

, the elements of a ring that associate with all others *

Nucleus (order theory) In mathematics, and especially in order theory, a nucleus is a function F on a meet-semilattice \mathfrak such that (for every p in \mathfrak): # p \le F(p) # F(F(p)) = F(p) # F(p \wedge q) = F(p) \wedge F(q) Every nucleus is evidently a monoton ...

, a mathematical term

Other sciences

Nucleus (syllable) A syllable is a unit of organization for a sequence of speech sounds typically made up of a syllable nucleus (most often a vowel) with optional initial and final margins (typically, consonants). Syllables are often considered the phonological "bu ...

, in linguistics, the central part of a syllable *

, the very dense central region of an atom *

Condensation nucleus Cloud condensation nuclei (CCNs), also known as cloud seeds, are small particles typically 0.2 µm, or one hundredth the size of a cloud droplet. CCNs are a unique subset of aerosols in the atmosphere on which water vapour condenses. This c ...

, the seed of a raindrop **

Ice nucleus An ice nucleus, also known as an ice nucleating particle (INP), is a particle which acts as the nucleus for the formation of an ice crystal in the atmosphere. Ice Nucleation Mechanisms There are a number of mechanisms of ice nucleation in the atmo ...

, the seed of a snowflake

Arts and media

Nucleus (band) Nucleus were a British jazz-fusion band, which continued in different forms from 1969 to 1989. In 1970, the band won first prize at the Montreux Jazz Festival, released the album ''Elastic Rock'', and performed both at the Newport Jazz Festiva ...

, a jazz-rock band from Britain * ''Nucleus'' (video game), a 2007 downloadable game on the PlayStation Store * ''Nucleus'' (Anekdoten album), 1995 * ''Nucleus'' (Sonny Rollins album), 1975 * Nucleus, predecessor to Canadian rock band

A Foot in Coldwater A Foot in Coldwater, also known as AFIC, was a Canadian rock band of the 1970s and 1980s. Its original lineup of musicians included Alex Machin (vocals), Bob Horne (keyboard), Paul Naumann (guitar), Danny Taylor (drums), and Hughie Leggat (bass ...

* ''Nucleus'', a scientific journal concerned with the cell nucleus; published by

Other uses

Nucleus (advocacy group) Nucleus was a British-European advocacy group, the forerunner to ''British Influence'' (sometimes ''The Centre for British Influence''). Nucleus was based in London, with additional operations in Brussels. Founded in 2010, Nucleus promoted a 'eur ...

, a UK-European political advocacy campaign organisation *

Nucleus Limited Nucleus Limited began as a private company in Sydney, Australia, in 1965. It was founded by former Watson-Victor executive Paul Murray Trainor, after acquisition of X-ray sales & service company Scientific & General. Other companies to be controll ...

, an Australian medical research company, taken over by Pacific Dunlop in 1988 *

NuCLEus Nucleus ( : nuclei) is a Latin word for the seed inside a fruit. It most often refers to: *Atomic nucleus, the very dense central region of an atom *Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucle ...

, a proposed 54-story mixed use building in Cleveland, Ohio, US *

Nucleus, the Nuclear and Caithness Archives , native_name_lang = , logo = , logo_size = , logo_alt = , logo_caption = , image = Nucleus, Caithness.jpg , image_size = , image_alt = , image_caption ...

, a British national archive