en-en

Nucleus

noun

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.

2) The body or the head of a comet.

3) An incipient ovule of soft cellular tissue.

4) A whole seed, as contained within the seed coats.

5) A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. 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.

6) The tip, or earliest part, of a univalve or bivalve shell.

7) The central part around which additional growths are added, as of an operculum.

8) A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.

Example Sentences for

Nucleus

1) In chemistry and physics , the atomic number -LRB- also known as the proton number -RRB- is the number of protons found in the Nucleus of an atom and therefore identical to the charge number of the Nucleus
2) All true algae therefore have a Nucleus enclosed within a membrane and plastids bound in one or more membranes
3) He said that chromosomes were `` independent entities which retain their independence even in the resting Nucleus ... What comes out of the Nucleus is what goes into it '
4) All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic Nucleus
5) Enrolled in the Academy of Richmond County , he met bassist Andy West and , together , they formed the Nucleus of the Dixie Grit , adding keyboardist Johnny Carr , guitarist and vocalist Frank Brittingham with Dave Morse drumming
6) Latin = Nucleus suprachiasmaticus
7) Additionally , elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the Nucleus
8) He discovered fertilization of sea urchins , he recognized the role of the cell Nucleus during inheritance and chromosome reduction during meiosis
9) The Nucleus of deuterium , called a deuteron , contains one proton and one neutron , whereas the far more common hydrogen Nucleus contains no neutron
10) The atomic radius of a chemical element is a measure of the size of its atoms , usually the mean or typical distance from the Nucleus to the boundary of the surrounding cloud of electrons
11) However , some languages also allow other sounds to form the Nucleus of a syllable , such as the syllabic l in the English word table -LRB- the stroke under the l indicates that it is syllabic ; the dot separates syllables -RRB- , or the r in Serbian vrt `` garden '
12) In 1932 Chadwick made a very important discovery : he discovered the particle in the Nucleus of an atom that became known as the neutron because it has no electric charge
13) These cell walls did not have the Nucleus and other organelles found in most living cells
14) The suprachiasmatic Nucleus -LRB- pronounced : supra-kye-as-matic noo-kle-us -RRB- , or the plural of Nucleus , nuclei , -LRB- SCN -RRB- , is a small organ in the hypothalamus in middle of the brain
15) The atomic number , Z , should not be confused with the mass number , A , which is the total number of protons and neutrons in the Nucleus of an atom
16) The energy levels of an electron around a Nucleus are given by :
17) -LRB- A third type , melanopsin in some of the retinal ganglion cells -LRB- RGC -RRB- , part of the body clock mechanism , is probably not involved in conscious vision , as these RGC do not project to the lateral geniculate Nucleus -LRB- LGN -RRB- but to the pretectal olivary Nucleus -LRB- PON -RRB- . -RRB-
18) In the Nucleus , the DNA is being condensed into the structures we see as chromosomes
19) Fine structure arises from relativistic kinetic energy corrections , spin-orbit coupling -LRB- an electrodynamic interaction between the electrons spin and motion and the Nucleuss electric field -RRB- and the Darwin term -LRB- contact term interaction of s-shell electrons inside the Nucleus -RRB-
20) All true algae therefore have a Nucleus enclosed within a membrane and chloroplasts bound in one or more membranes
21) It was once the Nucleus of the Kingdom of Dacia -LRB- 82 BC -- 106 AD -RRB-
22) It is found in the Nucleus of the cell
23) The energy of its state is mainly determined by the electrostatic interaction of the -LRB- negative -RRB- electron with the -LRB- positive -RRB- Nucleus
24) He discovered fertilization of sea urchins , he recognized the role of the cell Nucleus during inheritance and chromosome reduction during meiosis : in 1876 , he found that fertilization includes the penetration of a spermatozoon into an egg cell
25) The RNA is moved out of the cell Nucleus , where it does its work
26) Elements exist in different isotopes , with each isotope of an element differing in the number of neutrons in the Nucleus
27) Mitosis is the process by which a eukaryotic cell separates the chromosomes in its cell Nucleus into two identical sets in two nuclei
28) The atomic radius of an element is the distance between the Nucleus and the edge of the electron cloud
29) He said that chromosomes were `` independent entities which retain their independence even in the resting nucleua ... What comes out of the Nucleus is what goes into it '
30) The term is most commonly used for the energy levels of electrons in atoms or molecules , which are bound by the electric field of the Nucleus