| slovo | definícia |
nucleus
(mass) | nucleus
- jadro |
nucleus
(encz) | nucleus,jádro n: [bio.] [fyz.] [chem.] |
Nucleus
(gcide) | 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] |
nucleus
(wn) | nucleus
n 1: a part of the cell containing DNA and RNA and responsible
for growth and reproduction [syn: 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"
[syn: 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 [syn: lens nucleus, nucleus] |
| | podobné slovo | definícia |
caudate nucleus
(encz) | caudate nucleus, n: |
cell nucleus
(encz) | cell nucleus, n: |
dentate nucleus
(encz) | dentate nucleus, n: |
lenticular nucleus
(encz) | lenticular nucleus, n: |
lentiform nucleus
(encz) | lentiform nucleus, n: |
nucleus niger
(encz) | nucleus niger, n: |
pronucleus
(encz) | pronucleus, n: |
subthalamic nucleus
(encz) | subthalamic nucleus, n: |
Benzene nucleus
(gcide) | Benzene \Ben"zene\, n. [From Benzoin.] (Chem.)
A volatile, very inflammable liquid, C6H6, contained in the
naphtha produced by the destructive distillation of coal,
from which it is separated by fractional distillation. The
name is sometimes applied also to the impure commercial
product or benzole, and also, but rarely, to a similar mixed
product of petroleum.
[1913 Webster]
Benzene nucleus, Benzene ring (Chem.), a closed chain or
ring, consisting of six carbon atoms, each with one
hydrogen atom attached, regarded as the type from which
the aromatic compounds are derived. This ring formula is
provisionally accepted as representing the probable
constitution of the benzene molecule, C6H6, and as the
type on which its derivatives are formed.
[1913 Webster] |
Nucleus
(gcide) | 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] |
Nucleuses
(gcide) | 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] |
Paranucleus
(gcide) | Paranucleus \Par`a*nu"cle*us\, n. [Pref. para- + nucleus.]
(Biol.)
Some as Nucleolus.
[1913 Webster] |
Parent nucleus
(gcide) | parent \par"ent\ (p[^a]r"ent or p[=a]r"ent; 277), n. [L. parens,
-entis; akin to parere to bring forth; cf. Gr. porei^n to
give, beget: cf. F. parent. Cf. Part.]
1. One who begets, or brings forth, offspring; a father or a
mother.
[1913 Webster]
Children, obey your parents in the Lord. --Eph. vi.
1.
[1913 Webster]
2. That which produces; cause; source; author; begetter; as,
idleness is the parent of vice.
[1913 Webster]
Regular industry is the parent of sobriety.
--Channing.
[1913 Webster]
Parent cell. (Biol.) See Mother cell, under Mother,
also Cytula.
Parent nucleus (Biol.), a nucleus which, in cell division,
divides, and gives rise to two or more daughter nuclei.
See Karyokinesis, and Cell division, under Division.
[1913 Webster] |
Pronucleus
(gcide) | Pronucleus \Pro*nu"cle*us\, n.; pl. Pronuclei (-[imac]). [NL.
See Pro-, and Nucleus.] (Biol.)
One of the two bodies or nuclei (called male and female
pronuclei) which unite to form the first segmentation nucleus
of an impregnated ovum.
[1913 Webster]
Note: In the maturing of the ovum preparatory to
impregnation, a part of the germinal vesicle (see
Polar body, under Polar) becomes converted into a
number of small vesicles, which aggregate themselves
into a single clear nucleus. which travels towards the
center of the egg and is called the female pronucleus.
In impregnation, the spermatozoon which enters the egg
soon loses its tail, while the head forms a nucleus,
called the male pronucleus, which gradually travels
towards the female pronucleus and eventually fuses with
it, forming the first segmentation nucleus.
[1913 Webster] |
Segmentation nucleus
(gcide) | Segmentation \Seg`men*ta"tion\, n.
The act or process of dividing into segments; specifically
(Biol.), a self-division into segments as a result of growth;
cell cleavage; cell multiplication; endogenous cell
formation.
[1913 Webster]
Segmentation cavity (Biol.), the cavity formed by the
arrangement of the cells in segmentation or cleavage of
the ovum; the cavity of the blastosphere. In the gastrula
stage, the segmentation cavity in which the mesoblast is
formed lies between the entoblast and ectoblast. See
Illust. of Invagination.
Segmentation nucleus (Biol.), the body formed by fusion of
the male and female pronucleus in an impregnated ovum. See
the Note under Pronucleus.
Segmentation of the ovum, or Egg cleavage (Biol.), the
process by which the embryos of all the higher plants and
animals are derived from the germ cell. In the simplest
case, that of small ova destitute of food yolk, the ovum
or egg divides into two similar halves or segments
(blastomeres), each of these again divides into two, and
so on, thus giving rise to a mass of cells (mulberry mass,
or morula), all equal and similar, from the growth and
development of which the future animal is to be formed.
This constitutes regular segmentation. Quite frequently,
however, the equality and regularity of cleavage is
interfered with by the presence of food yolk, from which
results unequal segmentation. See Holoblastic,
Meroblastic, Alecithal, Centrolecithal,
Ectolecithal, and Ovum.
Segmentation sphere (Biol.), the blastosphere, or morula.
See Morula.
[1913 Webster] |
Trinucleus
(gcide) | Trinucleus \Tri*nu"cle*us\, n. [Pref. tri- + nucleus.] (Paleon.)
A genus of Lower Silurian trilobites in which the glabella
and cheeks form three rounded elevations on the head.
[1913 Webster] |
amygdaloid nucleus
(wn) | amygdaloid nucleus
n 1: an almond-shaped neural structure in the anterior part of
the temporal lobe of the cerebrum; intimately connected
with the hypothalamus and the hippocampus and the cingulate
gyrus; as part of the limbic system it plays an important
role in motivation and emotional behavior [syn: amygdala,
amygdaloid nucleus, corpus amygdaloideum] |
benzene nucleus
(wn) | benzene nucleus
n 1: a closed chain of 6 carbon atoms with hydrogen atoms
attached [syn: benzene formula, benzene ring, {benzene
nucleus}, Kekule formula] |
caudate nucleus
(wn) | caudate nucleus
n 1: a tail-shaped basal ganglion located in a lateral ventricle
of the brain [syn: caudate nucleus, caudate] |
cell nucleus
(wn) | cell nucleus
n 1: a part of the cell containing DNA and RNA and responsible
for growth and reproduction [syn: nucleus, {cell
nucleus}, karyon] |
dentate nucleus
(wn) | dentate nucleus
n 1: a large laminar nucleus of grey matter within the white
matter of each cerebral hemisphere |
lens nucleus
(wn) | lens nucleus
n 1: the central structure of the lens that is surrounded by the
cortex [syn: lens nucleus, nucleus] |
lenticular nucleus
(wn) | lenticular nucleus
n 1: a basal ganglion shaped like a lens and including the outer
reddish putamen and the inner pale yellow pallidum [syn:
lenticular nucleus, lentiform nucleus] |
lentiform nucleus
(wn) | lentiform nucleus
n 1: a basal ganglion shaped like a lens and including the outer
reddish putamen and the inner pale yellow pallidum [syn:
lenticular nucleus, lentiform nucleus] |
nucleus niger
(wn) | nucleus niger
n 1: a layer of deeply pigmented grey matter in the midbrain;
associated with the striate body; is involved in metabolic
disturbances associated with Parkinson's disease and with
Huntington's disease [syn: substantia nigra, {nucleus
niger}, locus niger] |
pronucleus
(wn) | pronucleus
n 1: the nucleus of the ovum or sperm after fertilization but
before they fuse to form the nucleus of the zygote |
revolutionary proletarian nucleus
(wn) | Revolutionary Proletarian Nucleus
n 1: a clandestine group of leftist extremists who oppose
Italy's labor policies and foreign policy; responsible for
bombing building in the historic center of Rome from 2000
to 2002 [syn: Revolutionary Proletarian Nucleus,
Revolutionary Proletarian Initiative Nuclei, NIPR] |
subthalamic nucleus
(wn) | subthalamic nucleus
n 1: an oval mass of grey matter located in the caudal part of
the subthalamus; associated with the striate body |
real-time operating system nucleus
(foldoc) | The Real-Time Operating System Nucleus
Real-Time Operating System Nucleus
(TRON) A project to develop an operating system
and man-machine interface that can work with other operating
systems to provide an environment for many small distributed
computers to cooperate in real time. TRON is headed by
Dr. Ken Sakamura of the University of Tokyo and supported by
most of the major Japanese computer makers and NTT.
(http://atip.org/public/atip.reports.91/tron.html).
(2003-05-23)
|
the real-time operating system nucleus
(foldoc) | The Real-Time Operating System Nucleus
Real-Time Operating System Nucleus
(TRON) A project to develop an operating system
and man-machine interface that can work with other operating
systems to provide an environment for many small distributed
computers to cooperate in real time. TRON is headed by
Dr. Ken Sakamura of the University of Tokyo and supported by
most of the major Japanese computer makers and NTT.
(http://atip.org/public/atip.reports.91/tron.html).
(2003-05-23)
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