nuclear chemist
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～ a chemist who specializes in nuclear chemistry
nuclear meltdown
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～ severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
nuclear fission
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～ a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
nuclear fusion
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～ a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
nuclease
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～ general term for enzymes that catalyze the hydrolysis of nucleic acid by cleaving chains of nucleotides into smaller units
nucleic acid
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～ (biochemistry) any of various macromolecules composed of nucleotide chains that are vital constituents of all living cells
nucleole
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～ a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis
nucleolus
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～ a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis
nucleon
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～ a constituent (proton or neutron) of an atomic nucleus
nucleonics
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～ the branch of physics that studies the internal structure of atomic nuclei
nucleoplasm
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～ the protoplasm that constitutes the nucleus of a cell
nucleoprotein
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～ any of several substances found in the nuclei of all living cells; consists of a protein bound to a nucleic acid
nucleoside
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～ a glycoside formed by partial hydrolysis of a nucleic acid
nucleosynthesis
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～ (astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom
nucleotide
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～ a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
nucleus niger
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～ a layer of deeply pigmented grey matter in the midbrain; associated with the striate body; is involved in metabolic disturbances associated with Parkinson's disease and with Huntington's disease
nucleus
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～ a small group of indispensable persons or things; "five periodicals make up the core of their publishing program"
nucleus
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～ the central structure of the lens that is surrounded by the cortex
nucleus
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～ (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
nucleus
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～ any histologically identifiable mass of neural cell bodies in the brain or spinal cord