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Nuclei | Definition of Nuclei at Dictionary.com
Nuclei definition, plural of nucleus. See more. The positively charged central region of an atom, composed of one or more protons and (for all atoms except hydrogen) one or more neutrons, containing most of the mass of the atom.
Nuclei - definition of nuclei by The Free Dictionary
2. a specialized, usu. spherical mass of protoplasm encased in a double membrane and found in eukaryotic cells, directing their growth, metabolism, and reproduction, and containing most of the genetic material.
Atomic nucleus - Wikipedia
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 in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg.
Cell nucleus - Wikipedia
In cell biology, the nucleus (pl. nuclei; from Latin nucleus or nuculeus, meaning kernel or seed) is a membrane-bound organelle found in eukaryotic cells.Eukaryotes usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have no nuclei, and a few others including osteoclasts have many.. The cell nucleus contains all of the cell's genome, except for a small ...
Nucleus | Definition of Nucleus by Merriam-Webster
Nucleus definition is - the small bright body in the head of a comet. How to use nucleus in a sentence.
Nucleus - definition of nucleus by The Free Dictionary
I traded for postage-stamps, for minerals, for curios, for birds' eggs, for marbles (I had a more magnificent collection of agates than I have ever seen any boy possess--and the nucleus of the collection was a handful worth at least three dollars, which I had kept as security for twenty cents I loaned to a messenger-boy who was sent to reform school before he could redeem them).
The Nucleus - Definition, Structure, and Function
The cell nucleus is bound by a double membrane called the nuclear envelope.This membrane separates the contents of the nucleus from the cytoplasm.Like the cell membrane, the nuclear envelope consists of phospholipids that form a lipid bilayer. The envelope helps to maintain the shape of the nucleus and assists in regulating the flow of molecules into and out of the nucleus through nuclear pores.
Nucleus | definition of nucleus by Medical dictionary
nucleus [noo´kle-us] (pl. nu´clei) (L.) 1. cell nucleus; a spheroid body within a cell, contained in a double membrane, the nuclear envelope, and containing the chromosomes and one or more nucleoli. The contents are collectively referred to as nucleoplasm. The chromosomes contain deoxyribonucleic acid (DNA), which is the genetic material that codes ...
Cell nucleus - Simple English Wikipedia, the free encyclopedia
The cell nucleus (plural: cell nuclei) is a membrane bound structure that contains the cell's genes and controls the cell's growth and reproduction. It is usually the most prominent organelle in a cell. The nucleus is small and round, and it works as the cell's control center. It contains chromosomes which house the DNA. The human body contains billions of cells, most of which have a nucleus.