| slovo | definícia |
t cell
(encz) | T cell, |
T cell
(gcide) | T cell \T" cell`\ (t[=e]"s[e^]l`) [From Thymus, the site of
maturation of T-cells.]
A type of white blood cell that circulates in the blood and
lymph, and provides cell-mediated immunity for the organism,
protecting against infecting cells or the body's own
malignant cells; also called T lymphocyte. There are
several types of T cells. They develop, as do B cells, from
progenitor cells in the bone marrow, but are distinguished
from B-cells (B-lymphocytes) by their site of
differentiation; T-cells mature in the thymus and B-cells in
the bone marrow (in birds in the Bursa of Fabricius). They
also have different antigen receptors from those of B-cells.
T-cells differentiate into cells that can directly kill
infecting cells (cell-mediated immunity, cytotoxity) or
activate other cells of the immune system (helper T cells),
whereas B-cells differentiate on activation into
antibody-secreting plasma cells. Helper T cells interact with
B-cells by secreting lymphokines that stimulate the B cell
which have detected a foreign antigen to enter the cell cycle
and develop, by repeated mitosis, into a clone of cells with
identical receptors, and then to secrete antibodies to that
specific antigen.
[PJC] |
t cell
(wn) | T cell
n 1: a small lymphocyte developed in the thymus; it orchestrates
the immune system's response to infected or malignant cells
[syn: T cell, T lymphocyte] |
| | podobné slovo | definícia |
cytotoxic t cell
(encz) | cytotoxic T cell, n: |
fat cell
(encz) | fat cell, n: |
goblet cell
(encz) | goblet cell, n: |
helper t cell
(encz) | helper T cell, n: |
killer t cell
(encz) | killer T cell, n: |
mast cell
(encz) | mast cell, n: |
oat cell carcinoma
(encz) | oat cell carcinoma, n: |
root cellar
(encz) | root cellar, n: |
t cell
(encz) | T cell, |
target cell
(encz) | target cell, n: |
terrorist cell
(encz) | terrorist cell, n: |
unit cell
(encz) | unit cell, n: |
wet cell
(encz) | wet cell, n: |
Giant cell
(gcide) | Giant \Gi"ant\, a.
Like a giant; extraordinary in size, strength, or power; as,
giant brothers; a giant son.
[1913 Webster]
Giant cell. (Anat.) See Myeloplax.
Giant clam (Zool.), a bivalve shell of the genus
Tridacna, esp. T. gigas, which sometimes weighs 500
pounds. The shells are sometimes used in churches to
contain holy water.
Giant heron (Zool.), a very large African heron ({Ardeomega
goliath}). It is the largest heron known.
Giant kettle, a pothole of very large dimensions, as found
in Norway in connection with glaciers. See Pothole.
Giant powder. See Nitroglycerin.
Giant puffball (Bot.), a fungus (Lycoperdon giganteum),
edible when young, and when dried used for stanching
wounds.
Giant salamander (Zool.), a very large aquatic salamander
(Megalobatrachus maximus), found in Japan. It is the
largest of living Amphibia, becoming a yard long.
Giant squid (Zool.), one of several species of very large
squids, belonging to Architeuthis and allied genera.
Some are over forty feet long.
[1913 Webster] |
Parent cell
(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] |
Pigment cell
(gcide) | Pigment \Pig"ment\, n. [L. pigmentum, fr. the root of pingere to
paint: cf. F. pigment. See Paint, and cf. Pimento,
Orpiment.]
1. Any material from which a dye, a paint, or the like, may
be prepared; particularly, the refined and purified
coloring matter ready for mixing with an appropriate
vehicle.
[1913 Webster]
2. (Physiol.) Any one of the colored substances found in
animal and vegetable tissues and fluids, as bilirubin,
urobilin, chlorophyll, etc.
[1913 Webster]
3. Wine flavored with species and honey. --Sir W. Scott.
[1913 Webster]
Pigment cell (Physiol.), a small cell containing coloring
matter, as the pigmented epithelial cells of the choroid
and iris, or the pigmented connective tissue cells in the
skin of fishes, reptiles, etc.
[1913 Webster] Pigmental |
cd4 t cell
(wn) | CD4 T cell
n 1: T cell with CD4 receptor that recognizes antigens on the
surface of a virus-infected cell and secretes lymphokines
that stimulate B cells and killer T cells; helper T cells
are infected and killed by the AIDS virus [syn: {helper T
cell}, helper cell, CD4 T cell, CD4 cell] |
cd8 t cell
(wn) | CD8 T cell
n 1: T cell with CD8 receptor that recognizes antigens on the
surface of a virus-infected cell and binds to the infected
cell and kill it [syn: killer T cell, killer cell,
cytotoxic T cell, CD8 T cell, CD8 cell] |
cytotoxic t cell
(wn) | cytotoxic T cell
n 1: T cell with CD8 receptor that recognizes antigens on the
surface of a virus-infected cell and binds to the infected
cell and kill it [syn: killer T cell, killer cell,
cytotoxic T cell, CD8 T cell, CD8 cell] |
fat cell
(wn) | fat cell
n 1: cells composed of fat [syn: fat cell, adipose cell] |
goblet cell
(wn) | goblet cell
n 1: an epithelial cell that secretes mucous |
helper t cell
(wn) | helper T cell
n 1: T cell with CD4 receptor that recognizes antigens on the
surface of a virus-infected cell and secretes lymphokines
that stimulate B cells and killer T cells; helper T cells
are infected and killed by the AIDS virus [syn: {helper T
cell}, helper cell, CD4 T cell, CD4 cell] |
killer t cell
(wn) | killer T cell
n 1: T cell with CD8 receptor that recognizes antigens on the
surface of a virus-infected cell and binds to the infected
cell and kill it [syn: killer T cell, killer cell,
cytotoxic T cell, CD8 T cell, CD8 cell] |
mast cell
(wn) | mast cell
n 1: a large connective tissue cell that contains histamine and
heparin and serotonin which are released in allergic
reactions or in response to injury or inflammation [syn:
mast cell, mastocyte, labrocyte] |
oat cell carcinoma
(wn) | oat cell carcinoma
n 1: highly malignant carcinoma composed of small round or egg-
shaped cells with little cytoplasm; lung cancers are
frequently oat cell carcinomas [syn: oat cell carcinoma,
small cell carcinoma] |
plant cell
(wn) | plant cell
n 1: a cell that is a structural and functional unit of a plant |
root cellar
(wn) | root cellar
n 1: an excavation where root vegetables are stored [syn: {root
cellar}, cellar] |
t cell
(wn) | T cell
n 1: a small lymphocyte developed in the thymus; it orchestrates
the immune system's response to infected or malignant cells
[syn: T cell, T lymphocyte] |
target cell
(wn) | target cell
n 1: any cell that has a specific receptor for an antigen or
antibody or hormone or drug, or is the focus of contact by
a virus or phagocyte or nerve fiber etc.
2: an abnormal red blood cell with the appearance of a dark ring
surrounding a dark center; associated with anemia |
terrorist cell
(wn) | terrorist cell
n 1: a cell of terrorists (usually 3 to 5 members); "to insure
operational security the members of adjacent terrorist
cells usually don't know each other or the identity of
their leadership" [syn: terrorist cell, radical cell] |
unit cell
(wn) | unit cell
n 1: the smallest group of atoms or molecules whose repetition
at regular intervals in three dimensions produces the
lattices of a crystal |
wet cell
(wn) | wet cell
n 1: a primary voltaic cell having a liquid electrolyte |
quantum-dot cellular automata
(foldoc) | Quantum-dot Cellular Automata
QCA
(QCA) Quantum logic circuits created
by orientating pairs of quantum cells so that their relative
positions determine their affect on each other. This is
functionally analogous but structurally different from how
individual gates in integrated circuits are combined to
create logical and memory circuitry.
The advantages of quantum-dot cellular automata over
conventional circuitry are extremely small size/high density,
low power requirements, and potentially high processing
speeds. Disadvantages (in 2000) are difficulty of fabrication
and low yield.
See also: quantum cell wire.
(http://nd.edu/~qcahome/).
(http://mitre.org/research/nanotech/quantum_dot_cell.html).
["Quantum Dot Heterostructures", D. Bimberg, et al, John Wiley
& Sons Ltd., Dec 1998].
(2001-07-17)
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