nucleus
Noun
Meaning
A kernel; hence, a central mass or point about which matter is gathered, or to which accretion is made; the central or material portion; -- used both literally and figuratively.
The body or the head of a comet.
An incipient ovule of soft cellular tissue.
A whole seed, as contained within the seed coats.
A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may be suspended a second rounded body, the nucleolus (see Nucleoplasm). See Cell division, under Division.
The tip, or earliest part, of a univalve or bivalve shell.
The central part around which additional growths are added, as of an operculum.
A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.
Source: Webster's dictionarySynonyms
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five periodicals make up the core of their publishing program
47 Tucanae has an apparent magnitude of 3.9, meaning that it is visible to the naked eye; it is a Shapley class III cluster, which means that it has a clearly defined nucleus.
270 Hs: prospects for a deformed doubly magic nucleus According to calculations, 108 is a proton magic number for deformed nuclei (nuclei that are far from spherical ), and 162 is a neutron magic number for deformed nuclei.
40 Ca has a nucleus of 20 protons and 20 neutrons and is the heaviest stable isotope of any element that has equal numbers of protons and neutrons.
About 6 MeV of the fission-input energy is supplied by the simple binding of an extra neutron to the heavy nucleus via the strong force; however, in many fissionable isotopes, this amount of energy is not enough for fission.
About one in 100,000 alpha emissions causes an excitation in the nucleus which then results in the emission of a gamma ray with a maximum energy of 803 keV.