node

node,

in astronomy, point at which the orbitorbit,
in astronomy, path in space described by a body revolving about a second body where the motion of the orbiting bodies is dominated by their mutual gravitational attraction.
..... Click the link for more information. of a body crosses a reference plane. One reference plane that is often used is the plane of the earth's orbit around the sun (eclipticecliptic
, the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its
..... Click the link for more information. ). Since the moon's orbit has an inclinationinclination,
in astronomy, the angle of intersection between two planes, one of which is an orbital plane. The inclination of the plane of the moon's orbit is 5°9' with respect to the plane of the ecliptic (the plane of the earth's orbit around the sun).
..... Click the link for more information. of 5°9' to the plane of the ecliptic, there are two nodes in the moon's orbit around the earth; the point where the moon in its orbit crosses from south of the ecliptic plane to north of it is called the ascending node, and the point where it crosses from north to south is called the descending node. A line connecting two nodes is called a line of nodes. The lunar nodes are the points where the moon's line of nodes, when extended, strike the celestial spherecelestial sphere,
imaginary sphere of infinite radius with the earth at its center. It is used for describing the positions and motions of stars and other objects. For these purposes, any astronomical object can be thought of as being located at the point where the line of sight
..... Click the link for more information. . The lunar nodes regress (move westward along the ecliptic) due to perturbationsperturbation
, in astronomy and physics, small force or other influence that modifies the otherwise simple motion of some object. The term is also used for the effect produced by the perturbation, e.g., a change in the object's energy or path of motion.
..... Click the link for more information. from the other bodies in the solar system, e.g., the sun and planets. Another reference plane that can be used to define nodes is the plane of the earth's equator, which is also the plane of the celestial equator (see equatorial coordinate systemequatorial coordinate system,
the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celestial sphere. The celestial sphere is an imaginary sphere with the observer at its center.
..... Click the link for more information. ). There are two nodes in the sun's apparent orbit around the earth. The ascending node, when the sun appears to cross the celestial equator from south to north, is the vernal equinoxequinox
, either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. The vernal equinox, also known as "the first point of Aries," is the point at which the sun appears to cross the celestial equator from south to north.
..... Click the link for more information. ; the descending node is the autumnal equinox. Perturbations like those that cause regression of the lunar nodes cause the precession of the equinoxesprecession of the equinoxes,
westward motion of the equinoxes along the ecliptic. This motion was first noted by Hipparchus c.120 B.C. The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to
..... Click the link for more information. .

Node

in astronomy, one of the two diametrically opposite points of the celestial sphere at which the plane of the orbit of some celestial body intersects a reference coordinate plane that is either the plane of the ecliptic or of the equator. The points where the orbit intersects the reference plane are sometimes also called nodes. A distinction is made between the ascending node (astronomical symbol ), where the celestial body crosses from the southern to the northern side of the reference plane, and the descending node (symbol ), where the body crosses the reference plane in the opposite direction.

For planets, comets, and the moon the ecliptic serves as the reference plane. In this case, the position of the nodes on the celestial sphere is defined by their longitudes. When the orbits of artificial earth satellites are determined, the plane of the equator serves as the reference plane, and the positions of the nodes are given by the right ascensions of the nodes. The longitude of the ascending node and the right ascension of the ascending node are orbital elements.

For binary stars the points where the orbits intersect the plane perpendicular to the line of sight are called nodes.

Node

in botany, the part of a shoot axis on which the leaf, the bud, and, sometimes, the adventitious roots form.

Nodes are separated by internodes. On the basis of the distance between nodes, shoots are distinguished as being long or short. Nodes form on the growing point of a shoot when the leaf rudiments first appear. At the node the procambial bundles of the developing leaf become embedded in the axis of the shoot. From these bundles and from the bundles of previously laid down leaves the common bundles of the shoot axis are formed. The common bundles constitute the entire conducting system of the axis. The anatomical structure of nodes varies, depending on the leaf arrangement, the number of procambial bundles in the leaf, and the way the bundles enter the node. Bundles of the axillary buds (branches), which form branch traces, join the conducting system of the shoot axis at the node. The structure of the shoot nodes is a taxonomic character for many plant species.

Node

in mathematics, a type of singular, or critical, point of a differential equation (seeSINGULAR POINT). All integral curves passing through points in a sufficiently small neighborhood of a node enter the node.

In Russian mathematical literature, three different types of such nodes are distinguished: ordinary (obychnyi), degenerate (vyrozhdennyi), and special (osobyi). An ordinary node is a critical point such that all but one of the integral curves passing through the point are tangent to the same line (Figure l, a). In the case of a degenerate node, all the integral curves passing through the node are tangent to the same line (Figure l, b). In the case of a special, or dicritical (dikriticheskii), node, integral curves enter the origin from every direction (Figure l, c). In English, the first two cases are sometimes called improper nodes, and the third case is sometimes referred to as a proper node.

Figure 1

The term “node” is also applied to one type of singular point of a curve.

The Russian word for node—uzel—also has the meaning of knot. In topology a knot is, in the simplest case, a continuous closed space curve that does not intersect itself.

Node

in physics, a point or surface in a standing-wave system at which the kinetic or potential energy of the wave is zero. In a stretched flexible string exhibiting sinusoidal free vibrations, tension nodes alternate with displacement nodes. In a standing sound wave, pressure nodes alternate with velocity nodes. In both cases, positions of zero potential energy alternate with positions of zero kinetic energy. Potential energy nodes coincide with kinetic energy antinodes, or loops, and kinetic energy nodes coincide with potential energy antinodes. In electromagnetic standing waves, nodes of the electric and magnetic fields are positions of zero electric and magnetic field strength, respectively; nodes of the electric field are antinodes of the magnetic field, and. vice versa.

node

[nōd] (anatomy) A knob or protuberance. A small, rounded mass of tissue, such as a lymph node. (astronomy) One of two points at which the orbit of a planet, planetoid, or comet crosses the plane of the ecliptic. One of two points at which a satellite crosses the equatorial plane of its primary. (botany) A site on a plant stem at which leaves and axillary buds arise. (electricity) branch point (electronics) A junction point within a network. (geology) That point along a fault at which the direction of apparent displacement changes. (industrial engineering) On a graphic presentation of a project, a symbol placed at the intersection of arrows that represent activities to identify the completion or start of an activity. (mathematics) crunode (astronomy) vertex (neuroscience) A point of constriction along a nerve. (physics) A point, line, or surface in a standing-wave system where some characteristic of the wave has essentially zero amplitude.

node

1. In electric wiring, a junction point at which several distribution or wiring conductors come together. 2. A panel point.

panel point, node

A point where members of a truss intersect.

node

1. the point on a plant stem from which the leaves or lateral branches grow 2. Physics a point at which the amplitude of one of the two kinds of displacement in a standing wave has zero or minimum value. Generally the other kind of displacement has its maximum value at this point 3. Maths a point at which two branches of a curve intersect, each branch having a distinct tangent 4. Maths Linguistics one of the objects of which a graph or a tree consists; vertex 5. Astronomy either of the two points at which the orbit of a body intersects the plane of the ecliptic. When the body moves from the south to the north side of the ecliptic it passes the ascending node and from the north to the south side it passes the descending node 6. Anatomya. any natural bulge or swelling of a structure or part, such as those that occur along the course of a lymphatic vessel (lymph node) b. a finger joint or knuckle 7. Computing an interconnection point on a computer network

node

(1)A point or vertex in a graph.

node

(2)network node.

node

(3)A hypertext document.

node

(1) See Node.js.

(2) In a network, a node is a junction or connection point. Every terminal, computer, hub, switch and router is a node. Devices that hold and serve data are "hosts." See host, hub, switch, router and terminal.

(3) In database management, a node is an item of data that can be accessed by two or more routes. See DBMS.

(4) In the Document Object Model (DOM), which exposes HTML and XML content to an application or script, every element, every attribute of that element, and each piece of textual content for every attribute is considered a node. See DOM.

(5) In computer graphics, a node is an endpoint of a graphical element. See graphics.

(6) In multiprocessing systems, a node can be a single processor or system. In MPP, it is one processor. In SMP, it is one computer system with two or more processors and shared memory. See SMP and MPP.

The First Four Nodes of the Internet

Scrawled on this paper in 1969 were the first four nodes of the ARPANET network, which later became the Internet. (Image courtesy of The Computer History Museum, www.computerhistory.org)

node

[nōd] a small mass of tissue in the form of a swelling, knot, or protuberance, either normal or pathological. adj., adj no´dal.node of Aschoff and Tawara atrioventricular node.atrioventricular node (AV node) a collection of cardiac fibers at the base of the interatrial septum that transmits the cardiac impulse initiated by the sinoatrial node.Bouchard's n's cartilaginous and bony enlargements of the proximal interphalangeal joints of the fingers in degenerative joint disease; such nodes on the distal joints are called Heberden's nodes. Delphian node a lymph node encased in the fascia in the midline just above the thyroid isthmus, so called because it is exposed first at operation and, if diseased, is indicative of disease of the thyroid gland.Flack's node sinoatrial node.Heberden's n's nodular protrusions on the phalanges at the distal interphalangeal joints of the fingers in osteoarthritis. Similar nodes on the proximal joints are called bouchard's nodes.

Comparison of Heberden's nodes (seen in patients with osteoarthritis) with Bouchard's nodes (seen in patients with rheumatoid arthritis). From Copstead and Banasik, 2000.hemal n's nodes with a rich content of erythrocytes within sinuses, found near large blood vessels along the ventral side of the vertebrae and near the spleen and kidneys in various mammals, especially ruminants, having functions probably like those of the spleen; their presence in humans is doubtful.Keith's node (Keith-Flack node) sinoatrial node.Legendre's n's Bouchard's nodes.lymph node see lymph node.Osler's n's small, raised, swollen, tender areas, bluish or sometimes pink or red, due to inflammation around the site of lodgement of small infected emboli in distal arterioles; they occur commonly in the pads of the fingers or toes, in the palms, or in the soles and are practically pathognomonic for subacute bacterial endocarditis.Parrot's n's bony nodes on the outer table of the skull of infants with congenital syphilis.n's of Ranvier constrictions of myelinated nerve fibers at regular intervals at which the sheath" >myelin sheath is absent and the axon is enclosed only by Schwann cell processes.SA node sinoatrial node.Schmorl's node an irregular or hemispherical bone defect in the upper or lower margin of the body of a vertebra into which the nucleus pulposus of the intervertebral disk herniates.sentinel node 1. the first lymph node to receive drainage from a tumor; used to determine whether there is lymphatic metastasis in certain types of cancer. If this node is negative for malignancy, others “upstream” from it are usually also negative.2. signal n.signal node an enlarged supraclavicular lymph node; often the first sign of a malignant abdominal tumor.singer's n's vocal cord nodules.sinoatrial node a collection of atypical muscle fibers in the wall of the right atrium where the rhythm of cardiac contraction is usually established; therefore also referred to as the pacemaker of the heart. Called also SA node.syphilitic node a swelling on a bone due to syphilitic periostitis.node of Tawara atrioventricular node.teacher's n's vocal cord nodules.Troisier's node (Virchow's node) sentinel node.

node

(nōd), [TA] Avoid using the simple word node in the sense of atrioventricular node or lymph node unless the meaning is clear from the context.1. A knob or nodosity; a circumscribed swelling; in anatomy, a circumscribed mass of tissue. 2. A circumscribed mass of differentiated tissue. 3. A knuckle, or finger joint. Synonym(s): nodus [TA] [L. nodus, a knot]

node

(nōd)n.1. a. A knob, knot, protuberance, or swelling.b. Medicine A small, well-defined mass of tissue that is either normal or pathological, as a lymph node or a node at an arthritic joint.2. a. A point or area where two lines, paths, or parts intersect or branch off: "The nodes, or branching points, are usually demarcated by sets of one or more new, evolutionary characters that typify all taxa" (Pat Shipley).b. A focal point or a point of interaction: "Inside the hospital, she became a node of gossip, despite being unable to communicate in the usual way" (Oliver Sacks).3. a. Botany The point on a stem where a leaf is attached or has been attached; a joint.b. See knot¹.4. Physics A point or region of virtually zero amplitude in a wave or periodic system.5. Mathematics The point at which a continuous curve crosses itself.6. Computers A terminal in a computer network.7. Astronomy a. Either of two diametrically opposite points at which the orbit of a planet intersects the ecliptic.b. Either of two points at which the orbit of a satellite intersects the orbital plane of a planet.

node

Cardiology An intrinsic pacemaker of the heart, composed of neural tissue. See Atrioventricular node, Sinoatrial node Decision-making Any point in a decision tree where choices occur or results assigned. See Chance node, Decision node, Outcome node Pathology 1. A circumscribed tissue mass. See Heberden's node, Singer's node.2. Lymph node, see there. See Axillary node, Irish's node, Potato node, Sentinel node, Virchow's node.

node

(nōd) [TA] 1. A knob or nodosity; a circumscribed swelling. 2. anatomy A circumscribed mass of differentiated tissue, especially a lymph node.
Synonym(s): nodus. [L. nodus, a knot]

node

(nod) [L. nodus, knot] 1. A knot, knob, protuberance, or swelling.2. A constricted region. 3. A small rounded organ or structure.

Aschoff node

Atrioventricular node.

atrioventricular node

Abbreviation: AV node
A node of specialized cardiac muscle fibers in the lower interatrial septum that receives impulses from the sinoatrial node and transmits them to the bundle of His. Synonym: Aschoff node See: atrioventricular bundle; conduction system of the heart for illus

Bouchard node

In osteoarthritis, bony enlargement of the proximal interphalangeal joints.

ectopic lymph node

A cluster of immunologically active cells inside a malignant tumor. The node may represent an attempt by the body to destroy foreign antigens on the tumor cell surface.

Haygarth nodes

Joint swelling seen in rheumatoid arthritis.

Heberden nodes

See: Heberden nodes

hemal node

A vascular node that structurally resembles a lymph node, present in certain ungulates. Synonym: hemal gland

Hensen node

See: Hensen, Christian Andreas Victor

LYMPH NODE

lymph node

A small encapsulated lymphoid organ that filters lymph. Lymph nodes are found at junctions or branches along the lymphatics. They provide sites where immune responses can be generated through the interaction of antigens, macrophages, dendritic cells and lymphocytes. See: illustration; immune response; inflammation; lymph; lymphocyteLymph nodes are 0.1-2.5 cm long kidney-shaped aggregates of lymphocytes and macrophages embedded in a meshwork reticulum composed of thin collagen fibers. At each lymph node, an artery enters through a surface indentation (the hilum) alongside an exiting vein and an exiting (efferent) lymphatic vessel; a number of afferent lymphatic vessels enter the lymph node at other sites. Inside lymph nodes, lymph slowly flows through endothelial sinuses lined by lymphocytes and macrophages. Macrophages remove macromolecules, particles, debris, and microorganisms from the lymph stream. Lymphocytes and antibodies move through the walls of the sinuses and into the passing lymph, while dendritic cells pass from the lymph into the lymphatic follicles, carrying antigens from the body's epithelia and from infected tissues. In the cortical region of the lymph node, the sinuses wind around lymphatic follicles, which are ovoid germinal centers packed with differentiating and proliferating B lymphocytes and surrounded by loose T lymphocytes. Lymphocytes and antibodies also enter and exit blood capillaries throughout the lymph node. Lymph nodes are most numerous in the neck, mediastinum, abdominal mesenteries, pelvis, the proximal limbs (the axillae and the groin), and along the posterior abdominal wall. Inside the chest and trunk, lymph nodes tend to be found along the veins near viscera.

Meynet nodes

See: Meynet nodes

neurofibril node

Ranvier's node.

Osler nodes

See: Osler nodes

Parrot nodes

See: Parrot nodes

piedric node

A node on the hair shaft seen in piedra.

primitive node

A knoblike structure at the anterior end of the primitive streak. Synonym: Hensen knot; primitive knot

Ranvier node

See: Ranvier node

Schmorl node

A node seen in radiographs of the spine. It is caused by prolapse of the nucleus pulposus into the end plate of the vertebra.

sentinel node

1. A lymph node that receives drainage from a tumor and is likely to harbor metastatic disease before cancer cells have the opportunity to spread elsewhere. 2. Signal node.

signal node

Enlargement of one of the supraclavicular lymph nodes; usually indicative of primary carcinoma of thoracic or abdominal organs. Synonym: sentinel node (2); Troisier's node; Virchow node

singer's node

Noncancerous, callus-like growths on the inner parts of the vocal cords, usually caused by voice abuse or overuse. It is marked by a singer's hoarseness and an inability to produce the desired notes. It is treated by resting the voice. Surgical removal of the nodules is necessary if they do not respond to conservative therapy. Synonym: chorditis nodosa; laryngeal nodule

sinoatrial node

Abbreviation: SA node
A specialized group of cardiac muscle cells in the wall of the right atrium at the entrance of the superior vena cava. These cells depolarize spontaneously and rhythmically to initiate normal heartbeats. Synonym: pacemaker (2); sinus node

sinus node

Sinoatrial node.

syphilitic node

Circumscribed swelling at the end of long bones due to congenital syphilis. The nodes are sensitive and painful during inflammation, esp. at night. See: Parrot's nodes

Troisier's node

Signal node.

Virchow node

Signal node.

node

that part of a plant stem where leaves are attached or may develop from buds. See also INTERNODE.

node

(nōd) [TA] 1. A knob or nodosity; a circumscribed swelling; in anatomy, a circumscribed mass of tissue. 2. A circumscribed mass of differentiated tissue. [L. nodus, a knot]

Patient discussion about node

Q. tender protuding lymph node lump rt. arm pit aprox. 1/2" dia. any concerns or recommend treatment necessary? A. lymph nodes can flare up any time you get infected in the armpit and all the area that it drains. i had it several times and it went away in the same manner that it came. i think that sometimes it caused because of a blockade done by deodorant. so i try to use this Chinese salt stone that doesn't contain aluminum.

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Aschoff node

atrioventricular node

Bouchard node

ectopic lymph node

Haygarth nodes

Heberden nodes

hemal node

Hensen node

lymph node

Meynet nodes

neurofibril node

Osler nodes

Parrot nodes

piedric node

primitive node

Ranvier node

Schmorl node

sentinel node

signal node

singer's node

sinoatrial node

sinus node

syphilitic node

Troisier's node

Virchow node

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Patient discussion about node

NODE

node

Synonyms for node

noun nodule

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Synonyms for node

noun a connecting point at which several lines come together

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noun any thickened enlargement

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noun (botany) the small swelling that is the part of a plant stem from which one or more leaves emerge

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noun (physics) the point of minimum displacement in a periodic system

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noun (astronomy) a point where an orbit crosses a plane

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noun the source of lymph and lymphocytes

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