nucleus 的定义
plural nu·cle·i [noo-klee-ahy, nyoo-], /ˈnu kliˌaɪ, ˈnyu-/, nu·cle·us·es.
- a central part about which other parts are grouped or gathered; core: A few faithful friends formed the nucleus of the club.
- Biology. a specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters.
- Physics. the positively charged mass within an atom, composed of neutrons and protons, and possessing most of the mass but occupying only a small fraction of the volume of the atom.
- Anatomy. a mass of nerve cells in the brain or spinal cord in which nerve fibers form connections.
- Also called condensation nucleus. Meteorology. a particle upon which condensation of water vapor occurs to form water drops or ice crystals.
- Chemistry. a fundamental arrangement of atoms, as the benzene ring, that may occur in many compounds by substitution of atoms without a change in structure.
- Astronomy. the condensed portion of the head of a comet.
- Phonetics. the central, most prominent segment in a syllable, consisting of a vowel, diphthong, or vowellike consonant, as the a-sound in cat or the l-sound in bottled; peak.the most prominent syllable in an utterance or stress group; tonic syllable.
nucleus 近义词
core; basis for something's
更多nucleus例句
- Having no electric charge, the neutron was the ideal bullet to shoot into an atom, able to penetrate the nucleus and destabilize it.
- In an atom, the protons and neutrons hang out in the center, or nucleus.
- The familiar protons and neutrons that make up the atomic nucleus are examples of baryons.
- Those energy-producing organelles are inherited from a mother and have their own DNA, distinct from the genetic information — from both parents — that’s stored in a cell’s nucleus.
- Alternatively, the detector might contain a minute amount of tritium, a radioactive form of hydrogen with two neutrons in its nucleus.
- Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.
- A July 1884 New York Times article called her “the nucleus and center of the whole organization of crime in New York City.”
- To win you have to start winning and these very attractive candidates could help form a nucleus to rebuild the Party.
- The Russian people should form the state at the center, “a nucleus around which other peoples are gathered.”
- To me, the nucleus of Peter Parker is him being left behind by his parents.
- Any epithelial cell may be so granular from degenerative changes that the nucleus is obscured.
- Each contains one irregular nucleus or several small, rounded nuclei.
- Occasionally the nucleus is irregular in shape, "clover-leaf" forms being not infrequent.
- Wright's stain gives the nucleus a deep purple color and the cytoplasm a pale robin's-egg blue in typical cells.
- Each contains a single round or oval nucleus, often located eccentrically.