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nucleus    音标拼音: [n'ukliəs]
n. 核心,核子,原子核,中坚

核心,核子,原子核,中坚

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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  • Nucleus | Definition, Function, Structure, Facts | Britannica
    The nucleus, in biology, is a specialized structure occurring in eukaryotic cells and separated from the rest of the cell by a nuclear membrane The nucleus contains the cell’s genetic material and controls and regulates its activities, including metabolism and cell division
  • Log in | Nucleus LMS
    Our courses help students from middle school to college learn important real-world skills that will prepare them for careers in today's digital world
  • Cell nucleus - Wikipedia
    The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm; and the nuclear matrix, a network within the nucleus that adds mechanical support
  • Nucleus: Have your best baby
    We feature a mix of creators, some may receive free or discounted Nucleus services, compensation, or other benefits, while others are sharing their experience on their own Their stories and opinions are their own
  • Cell Nucleus - Definition, Structure, Function
    The nucleus is a large, membrane-bound organelle in eukaryotic cells that contains the cell’s genetic material in the form of DNA Its primary role is to regulate gene expression, mediate replication, and coordinate cell activities like growth and metabolism
  • Atomic nucleus - Wikipedia
    Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud Protons and neutrons are bound together to form a nucleus by the nuclear force
  • Nucleus Institute | One State. One System.
    The Nucleus Institute connects Utah's research, talent, companies, capital and public partners so ideas move from discovery to real-world impact
  • Nucleus - National Human Genome Research Institute
    The nucleus is one of the most obvious parts of the cell when you look at a picture of the cell It's in the middle of the cell, and the nucleus contains all of the cell's chromosomes, which encode the genetic material
  • Nucleus: Definition, Structure, Parts, Functions, Diagram
    The nucleus is the organelle that houses chromosomes Chromosomes consist of DNA, which contains heredity information and instructions for cell growth, development, and reproduction
  • Nucleolus - National Human Genome Research Institute
    The nucleolus is a region found within the cell nucleus that is concerned with producing and assembling the cell's ribosomes





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