| KF, K-F | Kayser-Fleischer [rings] |
|---|---|
| N-m | newton-meter |
| N | Newton |
|---|
| heterocyclic compounds with 4 or more rings | A class of organic compounds containing four or more ring structures, one of which is made up of more than one kind of atom, usually carbon plus another atom. The heterocycle may be either aromatic or nonaromatic. (12 Dec 1998) |
|---|---|
| Donders' rings | An obsolete term for the iridescent ring's or haloes observed by a cloudy cornea due to acute glaucoma. (05 Mar 2000) |
| oesophageal webs and rings | <radiology> Congenital web, web secondary to bullous disease, cervical web, Plummer-Vinson (Patterson-Kelly) syndrome, mucosal (Schatzki) ring (12 Dec 1998) |
| Liesegang rings | Coloured ring's of precipitated silver chromate formed when a drop of concentrated silver nitrate is added to the surface of a gel (such as gelatin, agar, or silica gel) containing potassium dichromate. (05 Mar 2000) |
| newton | Derived unit of force in the SI system, expressed as meters-kilograms per second squared (m-kg-s-2); equivalent to 105 dynes in the CGS system. Abbreviation: N Origin: I. Newton (05 Mar 2000) |
| newton-meter | A unit of the MKS system, expressed as energy expended, or work done, by a force of 1 newton acting through a distance of 1 meter; equal to 1 joule = 107 ergs. (05 Mar 2000) |
| Newton's disk | A disk on which are seven coloured sectors, each occupying proportionally the same space as the corresponding primary colour in the spectrum; when the disk is rapidly rotated it appears white. (05 Mar 2000) |
| Newton's interference colours | <microscopy> Newton's series of colours by interference results when two wave-trains of white light meet. For some wavelengths (colours) there will be destructive interference (darkness) but for other wavelengths there will be reinforcement (colour). They are most frequently observed in very thin films, only wavelengths thick, for example, oil on water. The interference is caused by partially reflected light from the interfaces. Newton's series of colours appears in sequence in the Michel-Levy chart. (05 Aug 1998) |
| Newton, Sir Isaac | <person> English physicist, 1642-1727. See: newton, newtonian aberration, Newtonian constant of gravitation, newtonian flow, newtonian viscosity, Newton's disk, Newton's law. (05 Mar 2000) |
| Newton's law | The attractive force between any two bodies is proportional to the product of their masses, and inversely proportional to the square of the distance between their centres. Synonym: law of gravitation. (05 Mar 2000) |
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