| NOD mice | Nonobese diabetic mice. Have unique histocompatibility antigens, pancreatic beta cells are destroyed by an autoimmune response. (14 Oct 1997) |
|---|---|
| nodal | Relating to any node. (05 Mar 2000) |
| nodal bigeminy | Paired beats, each pair consisting of an A-V nodal extrasystole coupled to a beat of the dominant, usually sinus, rhythm. Synonym: nodal bigeminy. (05 Mar 2000) |
| nodal bradycardia | The cardiac rhythm when the heart is controlled by the A-V junction (including node); arising in the A-V junction, the impulse ascends to the atria and descends to the ventricles, each at varying speeds depending on site of the pacemaker. Synonym: A-V junctional rhythm, nodal bradycardia, nodal rhythm. (05 Mar 2000) |
| nodal fever | <dermatology> A disorder characterised by the formation of tender, red nodules on the front of the legs. Erythema nodosum primarily affects women and has been associated with certain infections: coccidiomycosis, fungal infections, tuberculosis, hepatitis B and syphilis. A sensitivity to a particular drug (for example penicillin, progestin, birth control pills) may also manifest this disorder. Other disorders and conditions that have been associated with erythema nodosum include: leukaemia, sarcoidosis, rheumatic fever, ulcerative colitis and pregnancy. (27 Sep 1997) |
| nodal plane | The plane corresponding to the optical centre of a simple lens. See: nodal point. (05 Mar 2000) |
| nodal point | One of two point's in a compound optical system so related that a ray directed toward the first point will appear to have passed through the second point parallel to its original direction. Synonym: axial point. (05 Mar 2000) |
| nodal rhythm | The cardiac rhythm when the heart is controlled by the A-V junction (including node); arising in the A-V junction, the impulse ascends to the atria and descends to the ventricles, each at varying speeds depending on site of the pacemaker. Synonym: A-V junctional rhythm, nodal bradycardia, nodal rhythm. (05 Mar 2000) |
| nodal tachycardia | Tachycardia originating in the A-V junction. Synonym: A-V junctional tachycardia, nodal tachycardia. (05 Mar 2000) |
| nodal tissue | See: atrioventricular node, sinuatrial node. (05 Mar 2000) |
| nodated | <geometry> Nodated hyperbola, a certain curve of the third order having two branches which cross each other, forming a node. Origin: L. Nodatus, p.p. Of nodare to make knotty, fr. Nodus knot. Source: Websters Dictionary (01 Mar 1998) |
| nodding spasm | In infants, a drop of the head on the chest due to loss of tone in the neck muscles as in epilepsia nutans, or to tonic spasm of anterior neck muscles as in West's syndrome, in adults, a nodding of the head from clonic spasm's of the sternomastoid muscles. Synonym: salaam attack, salaam spasm, spasmus nutans. (05 Mar 2000) |
| noddy | Origin: Prob. Fr. Nod to incline the head, either as in assent, or from drowsiness. 1. A simpleton; a fool. 2. <ornithology> Any tern of the genus Anous, as A. Stolidus. The arctic fulmar (Fulmarus glacialis). Sometimes also applied to other sea birds. 3. An old game at cards. 4. A small two-wheeled one-horse vehicle. 5. An inverted pendulum consisting of a short vertical flat spring which supports a rod having a bob at the top; used for detecting and measuring slight horizontal vibrations of a body to which it is attached. Source: Websters Dictionary (01 Mar 1998) |
| node | A point in a plant stem at which one or more leaves are attached. (18 Nov 1997) |
| node of Aschoff and Tawara | <cardiology> The location in the heart's conduction system, between the atria and the ventricles, which conducts the normal electrical impulse from the atria to the ventricles. (27 Sep 1997) |
| mice, inbred nod | A strain of non-obese diabetic mice developed in japan that has been widely studied as a model for T-cell-dependent autoimmune insulin-dependent diabetes mellitus in which insulitis is a major histopathologic feature, and in which genetic susceptibility is strongly MHC-linked. (12 Dec 1998) |
|---|