Noun
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.
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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. Source: Internet
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. Source: Internet
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. Source: Internet
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. Source: Internet
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. Source: Internet