| 单词 | nucleus |
| 释义 | nucleus (once / 1269 pages) n A nucleus is often called the brain, or control center, of a eukaryotic cell (that is, a cell with a nucleus). The noun nucleus has several senses, though most of them will appear in science. If a biology teacher says nucleus, she is probably talking about a cell (or a group of cells), but a physics teacher would be talking about the center of an atom, or possibly even the center of a comet’s head. Step out of science class, and nucleus likely refers to a core group — like the math fanatics that math club could not function without. WORD FAMILYnucleus: nucleate, nuclei, nucleuses+/nucleate: multinucleate, nucleated, nucleating USAGE EXAMPLESThat is what he used as the nucleus of his business. Washington Post(Dec 23, 2016) The methods are intended to fix problems linked to mitochondria, the energy-producing structures outside a cell’s nucleus. Washington Times(Dec 15, 2016) As the picture shows, ZNF554 is restricted to the cell’s nucleus. Economist(Dec 08, 2016) 1n a part of the cell containing DNA and RNA and responsible for growth and reproduction Syn|Hypo|Hyper cell nucleus, karyon pronucleus the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote subthalamic nucleusan oval mass of grey matter located in the caudal part of the subthalamus; associated with the striate body cell organ, cell organelle, organelle a specialized part of a cell; analogous to an organ 2n the positively charged dense center of an atom Hyper center, centre, midpoint a point equidistant from the ends of a line or the extremities of a figure 3n a small group of indispensable persons or things Syn|Hypo|Hyper core, core group cadre a nucleus of military personnel capable of expansion set a group of things of the same kind that belong together and are so used 4n any histologically identifiable mass of neural cell bodies in the brain or spinal cord Hypo|Hyper dentate nucleus a large laminar nucleus of grey matter within the white matter of each cerebral hemisphere neural structure a structure that is part of the nervous system 5n the central structure of the lens that is surrounded by the cortex Syn|Hyper lens nucleus anatomical structure, bodily structure, body structure, complex body part, structure a particular complex anatomical part of a living thing 6n (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 Hyper center, centre, midpoint a point equidistant from the ends of a line or the extremities of a figure |
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