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nucleus    音標拼音: [n'ukliəs]
n. 核心,核子,原子核,中堅

核心,核子,原子核,中堅

nucleus
核( 心 ); 核心; 核心程序; 核

nucleus
核心

nucleus
n 1: a part of the cell containing DNA and RNA and responsible
for growth and reproduction [synonym: {nucleus}, {cell
nucleus}, {karyon}]
2: the positively charged dense center of an atom
3: a small group of indispensable persons or things; "five
periodicals make up the core of their publishing program"
[synonym: {core}, {nucleus}, {core group}]
4: (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
5: any histologically identifiable mass of neural cell bodies in
the brain or spinal cord
6: the central structure of the lens that is surrounded by the
cortex [synonym: {lens nucleus}, {nucleus}]

Nucleus \Nu"cle*us\, n.; pl. E. {Nucleuses}, L. {Nuclei}. [L., a
kernel, dim. fr. nux, nucis, nut. Cf. {Newel} post.]
[1913 Webster]
1. 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.
[1913 Webster]

It must contain within itself a nucleus of truth.
--I. Taylor.
[1913 Webster]

2. (Astron.) The body or the head of a comet.
[1913 Webster]

3. (Bot.)
(a) An incipient ovule of soft cellular tissue.
(b) A whole seed, as contained within the seed coats.
[1913 Webster]

4. (Biol.) A body, usually spheroidal, in a eukaryotic cell,
distinguished from the surrounding protoplasm by a
difference in refrangibility and in behavior towards
chemical reagents, which contains the chromosomal genetic
material, including the chromosomal DNA. 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}.
[1913 Webster PJC]

Note: The nucleus is sometimes termed the endoplast or
endoblast, and in the protozoa is supposed to be
concerned in the female part of the reproductive
process. See {Karyokinesis}.
[1913 Webster]

5. (Zool.)
(a) The tip, or earliest part, of a univalve or bivalve
shell.
(b) The central part around which additional growths are
added, as of an operculum.
(c) A visceral mass, containing the stomach and other
organs, in Tunicata and some mollusks.
[1913 Webster]

112 Moby Thesaurus words for "nucleus":
Anlage, Kern, NMR, alpha particle, antibaryon, antilepton,
antimeson, atomic nucleus, atomic particle, axiom, axis, baryon,
basichromatin, beta particle, bud, center, center of action,
center of gravity, centroid, centrum, chromatin, chromatin strands,
core, dead center, diameter, diaphragm, egg, electron,
elementary particle, elixir, embryo, epicenter, equator, essence,
essential, flower, focus, fundamental, germ, germen, gist,
gravamen, heart, heterochromatin, hub, hypostasis, inner essence,
interior, karyosome, karyotin, kernel, lepton, loins, macronucleus,
marrow, mean, meat, median, medulla, meganucleus, meson,
metacenter, micronucleus, middle, midmost, midriff, midst, nave,
navel, neutron, nub, nuclear force, nuclear magnetic resonance,
nuclear particle, nuclear resonance, nucleolus, nucleon,
nucleosynthesis, nuts and bolts, omphalos, ovum, photon, pith,
pivot, plasmosome, postulate, principle, proton, quid, quiddity,
quintessence, rudiment, sap, seed, soul, spark, spermatozoon,
spirit, storm center, strangeness, strong interaction, stuff,
substance, the nitty-gritty, thick, thick of things, triton,
umbilicus, valence electron, waist, waistline, zone

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英文字典中文字典相關資料:
  • Select all the following that are present in a eukaryotic cell but not . . .
    Eukaryotic cells possess features such as a nucleus, internal compartments, and mitochondria, which are not present in prokaryotic cells Both types of cells do have a plasma membrane, but it is the organized structure of eukaryotic cells that distinguishes them Therefore, the correct selections are the nucleus, internal compartments, and mitochondria
  • Which cell components are found in BOTH plant and animal cells?
    Nucleus: The nucleus is present in both plant and animal cells It acts as the control center, housing the cell's DNA and managing processes like growth and reproduction Golgi Body (Apparatus): Also found in both plant and animal cells, the Golgi apparatus modifies, sorts, and packages proteins and lipids for storage or transport out of the cell
  • [FREE] During protein synthesis, mRNA is transcribed in the A. nucleus . . .
    Understanding Protein Synthesis During protein synthesis, mRNA is transcribed in the nucleus of eukaryotic cells This process occurs when the genetic information in DNA is copied to form messenger RNA (mRNA), which will then carry this information to the sites of protein synthesis After transcription, the mRNA exits the nucleus and enters the cytoplasm, where proteins are built by ribosomes
  • [FREE] What did Ernest Rutherfords gold foil experiment demonstrate . . .
    Ernest Rutherford's gold foil experiment revealed that most of an atom's volume is empty space and that a small, dense nucleus at the center contains the atom's positive charge This finding led to the abandonment of the plum pudding model, establishing the nuclear model of the atom The nucleus comprises most of the atom's mass while electrons orbit around it
  • Select the part whose main job is to fill the space between the cell . . .
    The main job of the part that fills the space between the cell membrane and the nucleus is to contain the cytosol and organelles, as well as to enable various cellular processes The correct answer to the question is C Cytoplasm The cytoplasm is a jelly-like substance that provides the medium in which the organelles of the cell, such as mitochondria and ribosomes, can operate efficiently It
  • Protons and neutrons are found in which part of the atom?
    The nucleus is the central part of the atom and contains protons, which have a positive charge, and neutrons, which have no charge Electrons, which are negatively charged, orbit around the nucleus in areas called orbitals
  • Which argument best explains the charge of an atomic nucleus?
    The atomic nucleus is positively charged because it is made up of protons, which have a positive charge Neutrons are neutral and do not contribute to the nucleus's charge Electrons are negatively charged but exist outside the nucleus and thus do not affect its overall charge
  • Generally speaking, an atom is made of a central - Brainly. com
    Generically speaking, an atom is composed of a central nucleus which is surrounded by orbiting electrons, hence the answer is option a nucleus; electrons The nucleus contains both protons and neutrons The negatively charged electrons orbit around the nucleus, and their arrangement determines the chemical behavior of the atom Figure 2 2 illustrates this concept of atomic structure where





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