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nucleus
has definitions from the fields of anatomy,zoology,physics,nuclear physics,astronomy,histology
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[ noun ] (anatomy,zoology) a part of the cell containing DNA and RNA and responsible for growth and reproduction
Synonyms Used in print (J. W. C. Hagstrom et al., "Debilitating muscular...)In February , 1959 , during the second admission to The New_York_Hospital , a biopsy specimen of the left gastrocnemius showed striking increase in the sarcolemmal sheath nuclei and shrunken muscle_fibers in several sections . Many of the myocardial fibers were hypertrophied and had large , irregular , basophilic nuclei . Such swollen fibers were deeply eosinophilic , contained a_few pyknotic nuclei , and showed loss of cross striations , obliteration of myofibrils , and prominent vacuolization . In_association_with these changes in the fibers , there were striking alterations in the muscle nuclei . In contrast to the nuclear changes described above , another change in muscle nuclei was seen , usually occurring in fibers that were somewhat smaller than normal but that showed distinct cross striations and myofibrillae . |
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[ noun ] a small group of indispensable persons or things
Synonyms Examples "five periodicals make up the core of their publishing program" Used in print (Gibson Winter, The Suburban Captivity of the...)The key to Protestant development , therefore , is economic integration of the nucleus of the congregation . Members of higher and lower social_status often cluster around this nucleus , so_that Protestant figures on social_class give the impression of spread over all social_classes ; but this is deceptive , for the core of membership is concentrated in a single social and economic stratum . This means that the antennae of the congregation are extended into the community , picking_up the wave_lengths of those who will fit into the social and economic level of the congregation ; the mission of the church is actually a process of informal co-optation ; the lay ministry is a means to recruit like-minded people who will strengthen the social_class nucleus of the congregation . |
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[ noun ] (physics,nuclear physics) the positively charged dense center of an atom
Used in print (James A. Ibers et al., "Proton magnetic resonance...)The nuclear dipole effects provide some information on the motions of the hydrogen nuclei , but the symmetry of the **f bond in **f remains in doubt . The magnetic_moment of an unpaired electron associated nearby may have a tremendous influence on the magnetic_resonance properties of nuclei . We then outline the theory of the interaction of paramagnetic dipoles with nuclei and show that the theory is in excellent agreement with experiment . |
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[ noun ] (anatomy,zoology,histology) any histologically identifiable mass of neural cell bodies in the brain or spinal cord
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